CN101312810A - Powder mixing method, agitator and manufacturing method of cellular construction body - Google Patents

Powder mixing method, agitator and manufacturing method of cellular construction body Download PDF

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Publication number
CN101312810A
CN101312810A CNA2005800521417A CN200580052141A CN101312810A CN 101312810 A CN101312810 A CN 101312810A CN A2005800521417 A CNA2005800521417 A CN A2005800521417A CN 200580052141 A CN200580052141 A CN 200580052141A CN 101312810 A CN101312810 A CN 101312810A
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CN
China
Prior art keywords
mentioned
powder
mixer
stirring vane
high rigidity
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CNA2005800521417A
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Chinese (zh)
Inventor
成瀬和也
角谷英司
田岛晃成
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Ibiden Co Ltd
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Ibiden Co Ltd
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Publication of CN101312810A publication Critical patent/CN101312810A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
    • B28C5/10—Mixing in containers not actuated to effect the mixing
    • B28C5/12—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers
    • B28C5/1238—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers for materials flowing continuously through the mixing device and with incorporated feeding or discharging devices
    • B28C5/1246—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers for materials flowing continuously through the mixing device and with incorporated feeding or discharging devices with feeding devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/60—Mixing solids with solids
    • B01F23/64—Mixing solids with solids using rotatable mixing elements at the lower end of discharge hoppers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/051—Stirrers characterised by their elements, materials or mechanical properties
    • B01F27/053—Stirrers characterised by their elements, materials or mechanical properties characterised by their materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/051—Stirrers characterised by their elements, materials or mechanical properties
    • B01F27/053—Stirrers characterised by their elements, materials or mechanical properties characterised by their materials
    • B01F27/0531—Stirrers characterised by their elements, materials or mechanical properties characterised by their materials with particular surface characteristics, e.g. coated or rough
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B01F27/72—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with helices or sections of helices
    • B01F27/724—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with helices or sections of helices with a single helix closely surrounded by a casing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/715—Feeding the components in several steps, e.g. successive steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
    • B28C5/10—Mixing in containers not actuated to effect the mixing
    • B28C5/12—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers
    • B28C5/14—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers the stirrers having motion about a horizontal or substantially horizontal axis
    • B28C5/142—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers the stirrers having motion about a horizontal or substantially horizontal axis the stirrer shaft carrying screw-blades
    • B28C5/143—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers the stirrers having motion about a horizontal or substantially horizontal axis the stirrer shaft carrying screw-blades for materials flowing continuously through the mixing device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
    • B28C7/04—Supplying or proportioning the ingredients
    • B28C7/0404—Proportioning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
    • B28B2003/203—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded for multi-channelled structures, e.g. honeycomb structures

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Accessories For Mixers (AREA)

Abstract

This invention provides a method for mixing powder using an agitator in which an agitation blade is less likely to be abraded and operation can be conducted without replacing a screw for a long period of time. The method for mixing powder is a method for mixing powder in which at least one kind of powder is mixed and transferred. The method for mixing powder is characterized by comprising introducing at least one kind of powder into an agitator comprising a screw and a casing provided around the screw, the screw comprising an agitation rod and an agitation blade, the screw being rotated about the agitation rod, the agitation blade being entirely formed of a high-hardness member, or being at least partly covered with a high-hardness covering layer, rotating the agitation rod, and transferring the at least one kind of powder while mixing.

Description

The manufacture method of the mixed method of powder, mixer and honeycomb structured body
Technical field
The present invention relates to the manufacture method of mixed method, mixer and the honeycomb structured body of powder.
Background technology
The particulates such as black smoke that contained the waste gas of discharging from the internal combustion engine of vehicle such as bus, truck and engineering machinery etc. become problem recently to the situation that environment and human body produce harm.So,, the amplifier case of the honeycomb structured body that all uses are made of porous ceramic has been proposed as the filter of the particulate in the capture in flue gas with purifying exhaust air.
Fig. 2 is the stereogram that schematically shows an example of this type of honeycomb structured body, and Fig. 3 (a) is the stereogram that schematically shows the honeycomb fired body that constitutes above-mentioned honeycomb structured body, (b) is the cutaway view along its A-A line.
In honeycomb structured body 130, a plurality of honeycomb fired body 140 shown in Figure 3 are got up by sealing material layer (bond layer) 131 boundlings, thereby constitute ceramic block 133, have again, be formed with sealing material layer (coating) 132 in the periphery of this ceramic block 133.
In addition, as shown in Figure 3, honeycomb fired body 140 is set side by side with a large amount of through holes 141 on longitudinally, and separated perforation hole wall between the through hole 141 143 is played a role as filter.
Promptly, shown in Fig. 3 (b), be formed on either party in the end of the entrance side of waste gas of the through hole 141 in the honeycomb fired body 140 or outlet side with joint filling material layer 142 sealing of hole, the waste gas that flows in the through hole 141 must flow out from another through hole 141 by perforation hole wall 143 backs that through hole 141 is separated, when waste gas connects hole wall 143 by this, particulate is captured in perforation hole wall 143 parts, thereby has purified waste gas.
, when making this type of honeycomb structured body 130, at first, will mix as the ceramic powders and the adhesive of material powder, interpolation and mixed dispersant liquid wait and modulate moistening mixture more in the past.Then, continuously this moistening mixture is carried out extrusion molding, and the formed body after will pushing cuts into predetermined length, thus, produce the honeycomb formed article of prism shape with mould.
Then, the honeycomb formed article drying of utilizing microwave drying or heated-air drying to make to obtain, then, predetermined through hole is implemented sealing of hole, after becoming, implement ungrease treatment and fire processing, thereby produce the honeycomb fired body with the state of joint filling material layer with any end sealing of through hole.
Then, be coated with the encapsulant pastel by side in the honeycomb fired body, use the encapsulant pastel to be bonded together between the honeycomb fired body, produce the aggregate of the honeycomb fired body of the state that a plurality of honeycomb fired body get up by the bond layer boundling thus.Next, the use cutter waits the aggregate enforcement machining to the honeycomb fired body that obtains to make it become reservation shapes such as cylinder, cylindroid, and is to form ceramic block, last, form coating by periphery coating encapsulant pastel, finish the manufacturing of honeycomb structured body at ceramic block.In the manufacture method of this type of honeycomb structured body, as the device that the material powder that will contain ceramic powders mixes, the device that supplies to forming machine after water-containing material is stirred is for example disclosed in patent documentation 1.
Patent documentation 1: TOHKEMY 2002-253946 communique
In this type of manufacture method, in the operation that ceramic powders and adhesive etc. are mixed, can in the mixed material powder, move it by using mixer, wherein said mixer has: conveyor screw, it is made of stirring rod and stirring vane, and is center rotation with above-mentioned stirring rod; And body, its be arranged on above-mentioned spirochetal around.
But, carry out at the mixer that use has a said structure under the mixing and mobile situation of material powder, in having the common spirochetal mixer that constitutes by metal material,, produced the problem that to carry out spirochetal replacing continually because of the wearing and tearing of stirring vane.
Particularly contain at material powder under the situation of hard ceramic powders such as silicon carbide powder, must carry out the replacing of stirring vane continually, certainly, when carrying out the replacing of stirring vane, need stop operation, thereby cause the decline of operating efficiency and productivity ratio.
In addition, patent documentation 1 disclosed invention relates to the invention of the device that uses when stirring water-containing material, and discloses such structure in this invention: make the stirring vane that weares and teares easily when stirring the material powder that contains ceramic powders constitute and can load and unload.
But, no matter be under the situation of changing conveyor screw self, still such as patent documentation 1 only change under the situation of stirring vane the record, carrying out on this aspect of replacing of component parts continually is identical, under any situation, all need to stop operation, so will improve operating efficiency and productivity ratio just need improve.
Summary of the invention
The inventor etc. are for addressing the above problem with keen determination research, found the countermeasure that is used to reduce constitute the spirochetal replacing frequency of mixer, and have finished the present invention.
That is, the mixed method of powder of the present invention is the mixed method of carrying out the powder of the mixing of at least a powder and conveying, it is characterized in that,
Above-mentioned at least a powder is put in the mixer, is made the stirring rod rotation of above-mentioned mixer, above-mentioned at least a powder is moved when mixing,
Wherein above-mentioned mixer has: conveyor screw, and it is made of above-mentioned stirring rod and stirring vane, and is center rotation with above-mentioned stirring rod; And body, its be arranged on above-mentioned spirochetal around, above-mentioned stirring vane integral body forms with high hardness components, perhaps is formed with the high rigidity coating at least a portion of above-mentioned stirring vane.
In the mixed method of above-mentioned powder, preferred above-mentioned at least a powder contains inorganic powder and organic dust.
In addition, in the mixed method of above-mentioned powder, preferably: as above-mentioned inorganic powder, it contains the different two or more powder of particle diameter, and, after putting into above-mentioned inorganic powder, put into organic dust according to particle diameter order from big to small.
In addition, in the mixed method of above-mentioned powder, the main component of preferred above-mentioned high hardness components or above-mentioned high rigidity coating is a tungsten carbide.
In addition, in the mixed method of above-mentioned powder, the distance that forms between the edge part of preferred above-mentioned stirring vane and the internal face of above-mentioned body is above 3mm and below 10mm.
In addition, in the mixed method of above-mentioned powder, the surface roughness Ra of preferred above-mentioned high hardness components or above-mentioned high rigidity coating is below 8 μ m.
Mixer of the present invention, it moves the mixture of powders that contains at least a powder when mixing, and this mixer has: conveyor screw, it is made of stirring rod and stirring vane, and is the center rotation with above-mentioned stirring rod; And body, its be arranged on above-mentioned spirochetal around, it is characterized in that,
Above-mentioned stirring vane integral body forms with high hardness components, perhaps is formed with the high rigidity coating at least a portion of above-mentioned stirring vane.
In mixer of the present invention, the main component of preferred above-mentioned high hardness components or above-mentioned high rigidity coating is a tungsten carbide.
In addition, in above-mentioned mixer, the distance that forms between the edge part of preferred above-mentioned stirring vane and the internal face of above-mentioned body is above 3mm and below 10mm.
In addition, in above-mentioned mixer, the surface roughness Ra of preferred above-mentioned high hardness components or above-mentioned high rigidity coating is below 8 μ m.
The manufacture method of honeycomb structured body of the present invention; The manufacture method of such honeycomb structured body: mixing and carrying after the mixing of the material powder that contains at least a ceramic powders carries operation; The mixing material raw material modulates moistening mixture again in the mixture of this material powder; By this moistening mixture that is shaped; Make a large amount of through holes across the honeycomb formed article that connects the column that hole wall is set up in parallel at longitudinally; This honeycomb formed article is fired; Produce the honeycomb structured body that is consisted of by the honeycomb fired body; It is characterized in that
Carry in the operation in above-mentioned mixing, the above-mentioned raw materials powder put in the mixer, make the stirring rod rotation of above-mentioned mixer, the above-mentioned raw materials powder is moved when mixing,
Wherein above-mentioned mixer has: conveyor screw, and it is made of above-mentioned stirring rod and stirring vane, and is center rotation with above-mentioned stirring rod; And body, its be arranged on above-mentioned spirochetal around, above-mentioned stirring vane integral body forms with high hardness components, perhaps is formed with the high rigidity coating at least a portion of above-mentioned stirring vane.
In the manufacture method of honeycomb structured body of the present invention, preferred above-mentioned raw materials powder contains ceramic powders and organic dust.
In addition, in the manufacture method of above-mentioned honeycomb structured body, preferably: as above-mentioned ceramic powders, it contains the different two or more ceramic powders of particle diameter, and,
After putting into above-mentioned inorganic powder, put into organic dust according to particle diameter order from big to small.
In addition, in the employed mixer, the main component of preferred above-mentioned high hardness components or above-mentioned high rigidity coating is a tungsten carbide in manufacture method of the present invention.
In addition, in the employed mixer, the distance that forms between the edge part of preferred above-mentioned stirring vane and the internal face of above-mentioned body is above 3mm and below 10mm in above-mentioned manufacture method.In addition, in the mixer that uses in above-mentioned manufacture method, the surface roughness Ra of preferred above-mentioned high hardness components or above-mentioned high rigidity coating is below 8 μ m.
Mixed method according to powder of the present invention, owing to use the mixer of the stirring vane possess the stirring vane that is formed with the high rigidity coating or to constitute by high hardness components, so stirring vane is not easy to wear, can not change conveyor screw ground for a long time turns round, can prevent because of the decline of the operating efficiency of running due to stopping and the minimizing of output, and can prevent the increase of cost of equipment.
In addition, because mixer of the present invention has stirring vane that is formed with the high rigidity coating or the stirring vane that is made of high hardness components,, can not change conveyor screw ground for a long time and turn round so stirring vane is not easy to wear.
Manufacture method according to honeycomb structured body of the present invention, owing to use the mixer of the stirring vane have the stirring vane that is formed with the high rigidity coating or to constitute by high hardness components, so stirring vane is not easy to wear, can not change conveyor screw ground for a long time turns round, can prevent because of the decline of the operating efficiency of running due to stopping and the minimizing of output, and can prevent the increase of cost of equipment.
Description of drawings
Fig. 1 (a) is the cutaway view that schematically shows an example of mixer of the present invention, (b) is the cutaway view along the A-A line of the mixer shown in (a), (c) is the amplification view of the part of expression mixer.
Fig. 2 is the stereogram that schematically shows an example of honeycomb structured body.
Fig. 3 (a) is the stereogram that schematically shows the honeycomb fired body that constitutes above-mentioned honeycomb structured body, (b) is its cutaway view along the A-A line.
Label declaration
10: mixer; 11: the coarse grain groove; 12: the particulate groove; 13: the adhesive groove; 14: conveyor screw; 15: stirring rod; 16: stirring vane; 16a: high rigidity coating; 17: body; 18: outlet.
The specific embodiment
At first, mixed method and the mixer of the present invention to powder of the present invention describes.
The mixed method of powder of the present invention is the mixed method of carrying out the powder of the mixing of at least a powder and conveying, it is characterized in that, above-mentioned at least a powder is put in the mixer, make the stirring rod rotation of above-mentioned mixer, above-mentioned at least a powder is moved when mixing, wherein above-mentioned mixer has: conveyor screw, and it is made of above-mentioned stirring rod and stirring vane, and is center rotation with above-mentioned stirring rod; And body, its be arranged on above-mentioned spirochetal around, above-mentioned stirring vane integral body forms with high hardness components, perhaps at least a portion at above-mentioned stirring vane is formed with the high rigidity coating.
In addition, mixer of the present invention is such mixer: the mixture of powders that contains at least a powder is moved when mixing, and this mixer has: conveyor screw, and it is made of stirring rod and stirring vane, and is the center rotation with above-mentioned stirring rod; And body, its be arranged on above-mentioned spirochetal around, it is characterized in that,
Above-mentioned stirring vane integral body forms with high hardness components, perhaps is formed with the high rigidity coating at least a portion of above-mentioned stirring vane.
Therefore, can use mixer of the present invention to carry out the mixed method of powder of the present invention suitably.
At first, come the formation of mixer of the present invention is described with reference to accompanying drawing.
Fig. 1 (a) is the cutaway view that schematically shows an example of mixer of the present invention, (b) is the cutaway view along the A-A line of the mixer shown in (a), (c) is the amplification view of the part of the mixer shown in the expression (a).
This mixer 10 is mainly by constituting with the lower part: coarse grain groove 11, and it is used to take in the inorganic powder of coarse grain; Particulate groove 12, it is used to take in the inorganic powder of particulate; Adhesive groove 13, it is used to take in adhesive; Conveyor screw 14, it is made of stirring rod 15 and stirring vane 16, and is center rotation with stirring rod 15; And body 17, its be arranged on conveyor screw 14 around, be formed with outlet 18 in the place near the end of body 17.Have again, though not shown, hang with band at an end of conveyor screw 14, this band also hangs on the end of motor, thereby constitutes: conveyor screw 14 rotates along with the rotation of motor.
In addition, each groove be coarse grain groove 11, particulate groove 12 and adhesive groove 13 respectively by the 11a of storage portion, 12a, 13a and metering put into the 11b of portion, 12b, 13b constitutes.
In addition, though not shown, be provided with the bin that is used for receiving these material powders in addition from the outside, wait each groove to supply with the powder of aequum to coarse grain groove 11 successively by methods such as air conveyings.
In coarse grain groove 11, particulate groove 12 and adhesive groove 13, the material powder that stores in the 11a of storage portion, 12a, 13a drops to the inside of conveyor screw 14 rotating bodies 17 with predetermined amount put into the 11b of portion, 12b, 13b metering by metering after.
Each material powder that falls is by stirring vane 16 mixed and conveyings.Here,, using under the situation of silicon carbide powder, because silicon carbide powder is the extremely hard inorganic powder as grinding agent etc., so stirring vane 16 self may wear and tear because of silicon carbide powder as one of material powder.So stirring vane 16 is formed with deposited metal in the part apart from its edge part 10mm and is used as high rigidity coating 16a, wherein above-mentioned deposited metal is a main component with the tungsten carbide as hard material.
Therefore, stirring vane 16 is not easy to wear, can not change conveyor screw ground for a long time and turns round continuously.
In mixer of the present invention, the width of above-mentioned high rigidity coating is preferably 7～20mm.
If the not enough 7mm of the width of high rigidity coating, then the contact area with silicon carbide powder etc. increases, the wearing and tearing of stirring vane aggravate easily, on the other hand, if the width of above-mentioned high rigidity coating surpasses 20mm, then material powder is easily attached on the stirring vane, and the mixing of material powder sometimes can not be carried out well.
Have, in the present invention, the width of high rigidity coating refers to the distance (with reference to L among Fig. 1) of the edge part of the partial distance stirring vane that is formed with the high rigidity coating again.
In addition, the desirable following 0.10mm that is limited to of the thickness of above-mentioned high rigidity coating, the better following 0.20mm that is limited to is limited to 0.60mm on desirable, is limited to 0.40mm on better.
If only guarantee ideal grade as high rigidity coating described later, then above-mentioned thickness gets final product more than 10 μ m, if but the thickness of this degree, then mar proof deficiency, from guaranteeing the angle of enough mar proofs, the thickness of above-mentioned high rigidity coating is preferably more than 0.10mm.In addition,, then need expensive formation if above-mentioned thickness surpasses 0.4mm, rather unfavorable economically.
Therefore, the thickness of above-mentioned high rigidity coating preferably is in the above-mentioned scope.
In addition, in mixer shown in Figure 1 10, on the part of the stirring vane that constitutes mixer 10, be formed with the high rigidity coating, but in mixer of the present invention, also can be at the coating of formation high rigidity on the whole of stirring vane, according to circumstances, also can form the high rigidity coating on the whole at the conveyor screw that constitutes by stirring rod and stirring vane.
In addition, part or all that constitute spirochetal stirring vane is made of high hardness components, according to circumstances, also available high hardness components constitutes conveyor screw integral body.But in above-mentioned mixer, preferably: form the high rigidity coating on the part of above-mentioned stirring vane, perhaps the part of above-mentioned stirring vane is made of high hardness components.The surface roughness of above-mentioned high rigidity coating or high hardness components is tended to bigger than the surface roughness of stirring rod main body and stirring vane main body usually, and particularly the surface roughness of the high rigidity coating that forms by spraying plating is tended to bigger than stirring rod main body and stirring vane main body.
This is because under the big situation of surface roughness, material powder is easily attached on stirring rod and the stirring vane, when material powder is gone up attached to stirring vane etc., can carry out the even mixing of material powder.
In addition, under the shared regional big situation of above-mentioned high rigidity coating and high hardness components, expending cost also is one of reason.
In addition, in the surface roughness of high rigidity coating that forms on the above-mentioned stirring vane or the high hardness components that constitutes above-mentioned stirring vane preferably below 8 μ m.
This be because, if above-mentioned surface roughness Ra surpasses 8 μ m, then exist material powder attached to the situation on the stirring vane, if material powder so as attached on the stirring vane, then can hinder the even mixing of material powder.
In addition, the surface roughness Ra of above-mentioned stirring rod is preferably below 4 μ m.This be because, if the surface roughness Ra of stirring rod surpasses 8 μ m, then exist material powder attached to the situation on the stirring rod, if material powder so as attached on the stirring rod time, then can hinder the even mixing of material powder.
In addition, in stirring rod or stirring vane, under the big situation of its surface roughness Ra, there is the tendency of easy wearing and tearing in both.
Have, in this manual, surface roughness Ra is the arithmetic average roughness Ra according to JIS B 0601 again.
In addition, be in method in the above-mentioned scope, for example can enumerate the method for using polishing grinding, emery wheel or abrasive disc (sheet) etc. as the surface roughness Ra that makes above-mentioned high rigidity coating or high hardness components.
As the polishing wheel that uses in polishing, for example can enumerate: dish type polishing wheel, fin shape polishing wheel, spirality polishing wheel etc. contain the abrasive particle polishing wheel; No abrasive particle polishing wheel such as polypropylene non-woven fabric etc.Contain employed abrasive particle in the abrasive particle polishing wheel as above-mentioned, for example can enumerate alumina silicate, aluminium oxide, carborundum etc.
As the kind of above-mentioned emery wheel, for example can enumerate resin bond wheel (resin system), magnesia emery wheel (bond system), skive, rubber control emery wheel (rubber controlgrindstone), epoxy resin control emery wheel (epoxy control grindstone) etc.
In addition, as abrasive disc, for example can use and contain the abrasive disc of granularity as the abrasive disc grinding-material of #A60～A240, concrete example is as enumerating abrasive disc that is attached with abrasive particles such as alumina silicate, aluminium oxide, carborundum on polyurethane sponge, nylon nonwoven fabrics, acrylic acid (sponge) etc. etc.
Have, above-mentioned high rigidity coating or above-mentioned high hardness components (following also can and be called high rigidity coating etc. with both) are meant that in the present invention the Vickers hardness of measuring according to JIS Z 2244 (HV) is the material more than 1000 again.
Though the Vickers hardness of above-mentioned high rigidity coating etc. gets final product more than 1000 (HV), and is better more than 2000 (HV).This is because mar proof can become good especially.
As above-mentioned high rigidity coating, can enumerate ceramic coating material, industrial diamond stone, plating film etc., as its concrete material, except main component is the material of tungsten carbide (HV:2500), for example also can enumerate with titanium carbide (HV:3600), titanium nitride (HV:1800～2500), cubic boron nitride (HV:2700), CVD diamond (HV:2500～4000), DLC (diamond-like-carbon/HV:2000～4000), ZrN (zirconium nitride) (HV:2000～2200), CrN (chromium nitride) (HV:1800～2200), TiCN (TiCN) (HV:2300～3500), TiAlN (aluminium nitride Titanium) (HV:2300～3300), Al 2O 3(aluminium oxide) (HV:2200～2400), Ti3 (HV:2300), WC-12%CO (HV:1200) etc. are the material of main component.Have again, as the concrete example of plating film, can enumerate no electrolytic nickel coating (handling down) at about 400 ℃ (HV:1000), CrC4 (hard chromium carbide 4%) coating (HV:1200), (the SiC amount is 2～6% to nickel coating; Handle down for 400 ℃) (HV:1300～1400) etc.
Have, in this manual, the Vickers hardness of each material of being put down in writing in the bracket is respectively its big probable value again.
Wherein, preferred tungsten carbide.This be because, forming by spraying plating under the situation of high rigidity coating, can form evenly and, securely bonding layer good with the adaptation of stirring vane main body etc.
In addition, as the material of above-mentioned high hardness components, for example can enumerate with tungsten carbide, titanium carbide, titanium nitride, ZrN, CrN, TiCN, TiAlN, Al 2O 3Deng the material that is main component.
As the method that forms above-mentioned high rigidity coating, physical vapour deposition (PVD)), UBM (under-bump metallization: metallising below the salient point) etc. can enumerate spraying plating, plating, their Combined Processing, CVD (Chemical Vapor Deposition chemical vapour deposition (CVD)), PVD (PhysicalVapor Deposition:, wherein, preferred spraying plating or plating, spraying plating is the most desirable.
This be because, though can form the high rigidity coating by the method beyond the spraying platings such as CVD, PVD, but in this case, cost increases when forming the high rigidity coating of above-mentioned ideal thickness, and complex-shaped or on a large scale part form under the situation of high rigidity coating and be difficult to adapt to.
On the other hand, forming by spraying plating under the situation of high rigidity coating, can form overlay film with low cost at short notice with expectation thickness.In addition, if use spraying plating,, also can form the high rigidity coating once at short notice even then for large component.
Have, though methods such as CVD, PVD, UBM are difficult to form coating on large component, if employing forms the high rigidity coating after being divided into widget, the method for assembling then then also can be applied to spirochetal making again.
As above-mentioned spraying plating, concrete example is as using flame coating, high-speed flame spraying plating, blast spraying plating, arc spraying, plasma spray coating, arc ion plating (AIP:Arc Ion Plating), hollow cathode (HCD) ion plating etc.
In addition, above-mentioned high rigidity coating etc. are main component with above-mentioned material, as other composition, also can contain metal ingredients such as Co, Cr, Ni.
Have, as the coating metal layer, also known have a Cr again 2O 5Plasma spray coating (HV:600), rhodium coating (HV:800～1000), Cr (hard chromium) coating (HV:700), no electrolytic nickel coating (HV:660) etc., but the Vickers hardness of these coating metal layers is little below HV1000, and mar proof is low, so preferred Vickers hardness is the above above-mentioned coating metal layer of HV1000.
In addition, as forming stirring vane main body under the high rigidity coating situation or stirring rod main body or, for example can enumerating stainless steel, nitrated steel, carbon steel, superhard alloy in the stirring vane of formation except that with high hardness components and the material of stirring rod.
In above-mentioned mixer, preferably: the diameter of above-mentioned stirring rod is 60～200mm, and the width of above-mentioned stirring vane is 15～30mm.
In addition, preferred above-mentioned stirring vane vertically is provided with respect to above-mentioned stirring rod, though above-mentioned stirring vane is arranged to be wound in the shape of a spiral on the above-mentioned stirring rod shape, the interval between the above-mentioned stirring vane of a circle is preferably set to 50～100mm.That is, preferably be provided with spirally with the fixed intervals of 50～100mm.
In addition, preferably: the distance that forms between the edge part of above-mentioned stirring vane and the internal face of above-mentioned body surpasses 3mm, and below 10mm.
This be because, if below 3mm, then there is the situation of mixed material powder equably in the distance that forms between the internal face of the edge part of stirring vane and body, on the other hand, if surpass 10mm, then be difficult to transferring raw material powder swimmingly, conveying capacity can produce fluctuation.
In addition, though the treating capacity that conveyor screw transmits is not particularly limited, be preferably 100～600kg/hr usually.
In above-mentioned mixer, under the situation with groove (the coarse grain groove 11 among Fig. 1, particulate groove 12 and adhesive groove 13) that a plurality of raw material supplyings use, the distance between each groove is preferably 50～200cm.
This be because, if the distance between each groove is below 50cm, then exist and to finish the homogenising of powder and the mixed uniformly situation of powder, on the other hand, if at a distance of 200cm, then powder becomes evenly, mixes equably between the powder, even, also can't see admixture substantially and change so surpass 200cm.
In addition, in mixer shown in Figure 1, have a kind of groove respectively, but in mixer of the present invention, also can have a plurality of grooves for each material powder for each material powder.
That is, can have the coarse grain groove, perhaps have the particulate groove, also or at Liang Chu have the adhesive groove at Liang Chu at Liang Chu.
Because this type of mixer of the present invention uses the stirring vane that is formed with the high rigidity coating,, can not change conveyor screw ground in long-time (for example, more than 6 months) and turn round so stirring vane is not easy to wear.
The mixed method of powder of the present invention can use this type of mixer to carry out.
In the mixed method of powder of the present invention, at first, in mixer, put at least a powder that becomes blending objects.Here, be that example describes to mix two kinds of different inorganic powders of mean particle diameter and a kind of situation of organic bond.
Under this situation, in coarse grain groove 11, put into the relatively large inorganic powder of mean particle diameter, in particulate groove 12, put into the less relatively inorganic powder of mean particle diameter, in adhesive groove 13, put into organic bond (organic dust).Then, by opening the outlet of each groove, each powder is put in the body 17.
Here, each groove in the mixer 10 is mounted to, coarse grain groove 11, particulate groove 12 and adhesive groove 13 with this be positioned in proper order from outlet 18 away from the position.
Its reason is, under the situation that inorganic powder and organic dust are mixed, by so that inorganic powder long-time mode that stops in body is put into mixed material powder more equably.
In addition, under the situation that cooperates the different two or more inorganic powder of mean particle diameter, so that the big powder long-time mode that stops in body of mean particle diameter is put into also and can be mixed more equably.
Have again, here, situation with two kinds of inorganic powders and the mixing of a kind of organic bond is illustrated, but for example under the situation that two or more organic bonds that mean particle diameter is different mix, the also preferred so that powder that mean particle diameter is big long-time mode that stops in body is put into.
In addition, for example under the situation that multiple inorganic particulate that mean particle diameter is roughly the same mixes, the preferred so that particle that bulk density is big long-time mode that stops in body is put into.This also is the same under the situation of organic filler.
In the mixed method of powder of the present invention, the rotary speed of conveyor screw 14 is preferably 20～200min -1(rpm).
This be because, if the not enough 20min of rotary speed -1, then the transporting velocity of mixed-powder is slow, and productivity ratio descends, and is surpassing 200min -1The time, existence can not well-mixed situation.
In addition, the amount of material powder is preferably: when conveyor screw 14 stops, the upper surface of material powder (with reference to the A among Fig. 1) be positioned at than half position of the diameter of stirring rod 15 by under part.
This is because for also being present under the situation than the amount of the degree of half part of leaning on of the diameter of stirring rod, take place to mix bad at material powder easily.
Have, the more preferably about such amount of the amount of above-mentioned raw materials powder: when conveyor screw 14 was failure to actuate, the upper surface of material powder was identical with the lower end of stirring rod 15 or lower than it again.This is because material powder is mixed well, and carries and also carry out swimmingly.In addition, also because,, can further reduce the replacing frequency of stirring vane so stirring vane is not easy to wear owing to little with the contact area of stirring vane.
In addition, the amount of above-mentioned raw materials powder more preferably: when conveyor screw 14 rotation, the upper surface of material powder be in body internal height 10～50% between the position.
This be because, the upper surface of above-mentioned raw materials powder be in than the internal height of body 10% by under the situation of position under, there are the undercompounding of material powder or the situation that conveying capacity tails off, on the other hand, surpass 50% o'clock of internal height of body at the upper surface of above-mentioned raw materials powder, along with spirochetal rotation, material powder will be rolled into spirochetal top, stirring vane weares and teares easily, and has the tendency that may wear to stirring rod.
In the mixed method of such powder of the present invention, use is mixed-powder and be formed with the mixer of high rigidity coating on stirring vane equably, so stirring vane is not easy to wear, can not change conveyor screw ground in long-time turns round, can prevent to turn round stop due to the decline of operating efficiency and the minimizing of output, and can prevent the increase of cost of equipment.
Below, the manufacture method of honeycomb structured body of the present invention is described.
The manufacture method of honeycomb structured body of the present invention; The manufacture method of such honeycomb structured body: mixing and carrying after the mixing of the material powder that contains at least a ceramic powders carries operation; The mixing material raw material modulates moistening mixture again in the mixture of this material powder; By this moistening mixture that is shaped; Make a large amount of through holes across the honeycomb formed article that connects the column that hole wall is set up in parallel at longitudinally; This honeycomb formed article is fired; Produce the honeycomb structured body that is consisted of by the honeycomb fired body; It is characterized in that
Carry in the operation in above-mentioned mixing, the above-mentioned raw materials powder put in the mixer, make the stirring rod rotation of above-mentioned mixer, the above-mentioned raw materials powder is moved when mixing,
Wherein above-mentioned mixer has: conveyor screw, and it is made of above-mentioned stirring rod and stirring vane, and is center rotation with above-mentioned stirring rod; And body, its be arranged on above-mentioned spirochetal around, above-mentioned stirring vane integral body forms with high hardness components, perhaps is formed with the high rigidity coating at least a portion of above-mentioned stirring vane.
That is, the manufacture method of honeycomb structured body of the present invention is the manufacture method of carrying the mixed method of using the mixer of the present invention that illustrated and powder in the operation in the mixing of material powder.
The manufacture method of honeycomb structured body of the present invention is described according to process sequence below.
Here, be that the situation of the honeycomb structured body of carborundum is an example with the main component of making constituent material, come using silicon carbide powder to describe as the manufacture method of the honeycomb structured body under the situation of inorganic powder.
Certainly, the main component of the constituent material of honeycomb structured body is not limited to carborundum, in addition, for example also can enumerate nitride ceramics such as aluminium nitride, silicon nitride, boron nitride, titanium nitride; Carbide ceramics such as zirconium carbide, titanium carbide, ramet, tungsten carbide; Oxide ceramics such as aluminium oxide, zirconia, cordierite, mullite, aluminium titanates etc.
Wherein, preferred non-oxide ceramics, preferred especially carborundum.This is because hear resistance, mechanical strength, pyroconductivity etc. are good.Have again, also can enumerate the siliceous pottery that in above-mentioned pottery, has cooperated metallic silicon; Pottery by silicon and silicate compound be combined into etc. is used as constituent material, wherein, has preferably cooperated the material (containing silicon-carbon-silicon carbide) of metallic silicon in carborundum.
(1) at first, silicon carbide powder that mean particle diameter is different and organic bond (organic dust) dry type are mixed, and modulate mixed-powder.
In manufacture method of the present invention, in this operation, use the mixed method of the powder of the invention described above.
Here, the mixed-powder that modulates is discharged from the outlet (being 18 Fig. 1) of mixer, puts into subsequent processing then.
Though the particle diameter of above-mentioned silicon carbide powder is not particularly limited, but preferably in the ablating work procedure of back, shrink little powder, for example, the powder that preferably powder combinations of the mean particle diameter with about 0.1～1.0 μ m of the powder of the mean particle diameter of about 0.3～50 μ m of having of 100 weight portions and 5～65 weight portions is formed.
Though, need to regulate firing temperature, by regulating the particle diameter of inorganic powder, also adjustable solar term bore dia for the hole diameter of regulating the honeycomb fired body etc.
Then, the powder that will have the mean particle diameter of about 0.3～50 μ m is put in the outlet groove (being coarse grain groove 11 among Fig. 1) farthest apart from mixer, and the powder that will have the mean particle diameter of about 0.1～1.0 μ m is put into apart from outlet second groove (being particulate groove 12 among Fig. 1) far away.
As above-mentioned organic bond, be not particularly limited, for example can enumerate methylcellulose, carboxymethyl cellulose, hydroxyethylcellulose, polyethylene glycol, phenolic resins, epoxy resin etc.Wherein, preferable methyl cellulose.The use level of above-mentioned adhesive is usually preferably: with respect to the inorganic powder of 100 weight portions, be about 1～10 weight portion.
Have, organic bond is put into from the nearest groove of the outlet of mixer (Fig. 1 is an adhesive groove 13) again.
(2) then, aqueous plasticizer, lubricant and water hybrid modulation are gone out mixing material, then, the mixed-powder that will modulate in the operation of above-mentioned (1) uses the wet mixed machine to mix with above-mentioned mixing material, modulates the moistening mixture of formed body manufacturing usefulness thus.
As above-mentioned plasticizer, be not particularly limited, for example can enumerate glycerine etc.
In addition,, be not particularly limited, for example can enumerate polyoxy alkylidene based compounds such as polyoxyethylene alkyl ether, polyoxypropylene alkyl ether etc. as above-mentioned lubricant.
As the concrete example of lubricant, for example can enumerate polyoxyethylene single-butyl ether, polyoxypropylene single-butyl ether etc.
Have again, according to circumstances, not plasticizer-containing, lubricant in the above-mentioned moistening mixture.
In addition, when the above-mentioned moistening mixture of modulation, also dispersant liquid can be used,, for example alcohol such as organic solvents such as water, benzene, methyl alcohol etc. can be enumerated as above-mentioned dispersant liquid.
In addition, in above-mentioned moistening mixture, also can add the shaping assistant.
As above-mentioned shaping assistant, be not particularly limited, for example can list ethylene glycol, dextrin, aliphatic acid, fatty acid soaps, polyalcohol etc.
In addition, in above-mentioned moistening mixture, as required, also can add with oxide based pottery be composition be pore creating materials such as the hollow ball of small hollow sphere, spherical acrylic particles, graphite.
As above-mentioned hollow ball, be not particularly limited, for example can list alumina hollow ball, glass microvoid bulbus cordis, white sand (シ ラ ス) hollow ball, cigarette ash (Off ラ イ ア Star シ ユ) hollow ball (FA hollow ball), mullite hollow ball etc.Wherein, alumina hollow ball preferably.
In addition, preferred its temperature of the moistening mixture of the use silicon carbide powder of modulating here is below 28 ℃.This is because when temperature was too high, organic bond is gelation sometimes.
In addition, the ratio of the organic principle in the above-mentioned moistening mixture is preferably below the 10 weight %, and the amount of moisture is preferably below 10～17 weight %.
(3) next, above-mentioned moistening mixture after modulation by conveyor delivery to extrusion moulding machine, and pass through the honeycomb formed article that extrusion molding forms reservation shape.
Then, use microwave dryer, air drier, dielectric drier, drying under reduced pressure machine, vacuum drier, freeze drier to wait dry above-mentioned honeycomb formed article, form ceramic dried body.
Then, as required, in the end of the outlet side of entrance side through hole group and the end of the entrance side of outlet side through hole group fill the closed material pastel that becomes closed material of scheduled volume, with the through hole sealing of hole.
Be not particularly limited as above-mentioned closed material pastel, but the porosity of the closed material that preferably produces through subsequent handling is 30～75% material, for example, can use and the identical pastel of above-mentioned moistening mixture.
(4) next, under predetermined condition, (for example carry out degreasing by the ceramic dried body that will be filled with above-mentioned closed material pastel, 200～500 ℃), (for example fire, 1400～2300 ℃), can produce such honeycomb fired body (with reference to Fig. 3): integral body is made of a fired body, a plurality of through holes are set up in parallel on longitudinally across connecting hole wall, and any end of above-mentioned through hole is closed.
The degreasing of above-mentioned ceramic dried body and the condition of firing can be used employed condition when in the past making the filter that is made of porous ceramic.
(5) then, side in the honeycomb fired body becomes the encapsulant pastel of sealing material layer (bond layer) and forms encapsulant pastel layer with the homogeneous thickness coating, on sealing material pastel layer, repeat the operation of stacked other honeycomb fired body successively, produce the aggregate of the honeycomb fired body of pre-sizing.
As above-mentioned encapsulant pastel, for example can enumerate the pastel that constituted by inorganic bond, organic bond, with inorfil and/or inorganic particulate etc.
As above-mentioned inorganic bond, for example can enumerate Ludox, alumina sol etc.They both can be used alone, or two or more kinds may be used.In above-mentioned inorganic bond, Ludox preferably.
As above-mentioned organic bond, for example can enumerate polyvinyl alcohol, methylcellulose, ethyl cellulose, carboxymethyl cellulose etc.They both can be used alone, or two or more kinds may be used.In above-mentioned organic bond, carboxymethyl cellulose preferably.
As above-mentioned inorfil, for example can enumerate ceramic fibres such as alumina silicate, mullite, aluminium oxide, silica etc.They both can be used alone, or two or more kinds may be used.In above-mentioned inorfil, alumina fibre preferably.
As above-mentioned inorganic particulate, for example can enumerate carbide, nitride etc., specifically can enumerate inorganic powder that constitutes by carborundum, silicon nitride, boron nitride etc.These inorganic particulates can use separately, also can be with two or more and usefulness.In above-mentioned inorganic particulate, the preferred good carborundum of heat conductivity.
Have again, in above-mentioned encapsulant pastel, also can be as required, adding with oxide based pottery is pore creating materials such as the hollow ball as small hollow sphere of composition, spherical acrylic particles, graphite.
As above-mentioned hollow ball, be not particularly limited, for example can enumerate alumina hollow ball, glass microvoid bulbus cordis, white sand hollow ball, cigarette ash hollow ball (FA hollow ball), mullite hollow ball etc.Among them, alumina hollow ball preferably.
(6) then, heat the aggregate of this honeycomb fired body, make encapsulant pastel layer drying, curing, thereby form sealing material layer (bond layer).
Then, use diamond custting machine etc., a plurality of honeycomb fired body by the bond together aggregate enforcement machining of the honeycomb fired body that forms of sealing material layer (bond layer), are produced the ceramic block of cylindrical shape.
Then, use above-mentioned encapsulant pastel to form coating in the periphery of honeycomb block.By through such operation, can produce such honeycomb structured body (with reference to Fig. 2): a plurality of honeycomb fired body are provided with coating by the bond together peripheral part of ceramic block of the cylindrical shape that forms of bond layer.
In addition, in the manufacture method of honeycomb structured body of the present invention, afterwards can be as required and in honeycomb structured body supported catalyst.
The load of above-mentioned catalyst also can be carried out in the honeycomb fired body before making aggregate.
Under the situation of supported catalyst, preferably form the high pellumina of specific area, and on the surface of this pellumina, add catalyst such as cocatalyst and platinum on the surface of honeycomb structured body.
As the method that on the surface of above-mentioned honeycomb structured body, forms pellumina, for example can enumerate: make Al (NO 3) 3Be impregnated in the honeycomb structured body and the method for heating Deng the solution of metal compound that contains aluminium; Make the solution impregnation that contains alumina powder in honeycomb structured body and the method for heating etc.
As the method for additional cocatalyst on above-mentioned pellumina, for example can enumerate and make Ce (NO 3) 3Be impregnated in the honeycomb structured body and the method for heating etc. Deng the solution of metal compound that contains rare earth element etc.
As the method for additional cocatalyst on above-mentioned pellumina, for example can enumerate and make dinitroso diammonia platinum salpeter solution ([Pt (NH 3) 2(NO 2) 2] HNO 3, platinum concentration is 4.53 weight %) etc. be impregnated in the honeycomb structured body and the method for heating etc.
In addition, also can use following method to come additional catalyst: additional catalyst in aluminium oxide particles in advance, and make the solution impregnation that contains the alumina powder that has added catalyst in honeycomb structured body and heating.
In addition, here the manufacture method of Shuo Ming honeycomb structured body is honeycomb structured body with formation that a plurality of honeycomb fired body are got up to form by sealing material layer (bond layer) boundling (below be also referred to as the assembly type honeycomb structured body), but also can be the honeycomb structured body that is made of a honeycomb fired body of the ceramic block of cylindrical shape (below be also referred to as one-piece type honeycomb structured body) by the honeycomb structured body that manufacture method of the present invention produces.
Under the situation of making this type of one-piece type honeycomb structured body, at first, except the size of the honeycomb formed article that is shaped by extrusion molding compare with the situation of making the assembly type honeycomb structured body big, use the method identical to make honeycomb formed article with the situation of manufacturing assembly type honeycomb structured body.
Here, because the methods that material powder is mixed etc. are identical with the method for making above-mentioned assembly type honeycomb structured body, so omit its explanation here.
Then, same with the manufacturing of assembly type honeycomb structured body, use microwave dryer, air drier, dielectric drier, drying under reduced pressure machine, vacuum drier, freeze drier to wait dry above-mentioned ceramic formation body, form ceramic dried body.Next, in the end of the outlet side of entrance side through hole group and the end of the entrance side of outlet side through hole group fill the encapsulant pastel that becomes encapsulant of scheduled volume, with the through hole sealing of hole.
Then, same with the manufacturing of assembly type honeycomb structured body, by carrying out degreasing, firing and make ceramic block, as required,, can make one-piece type honeycomb structured body by carrying out the formation of sealing material layer (coating).In addition, also available said method supported catalyst in above-mentioned one-piece type honeycomb structured body.
Have again, making by manufacture method as described above under the situation of honeycomb structured body, under the situation of making above-mentioned assembly type honeycomb structured body, as inorganic powder, the preferred use: two kinds of silicon carbide powders that mean particle diameter is different; Perhaps Si powder and silicon carbide powder under the situation of making one-piece type honeycomb structured body, as inorganic powder, preferably use the material powder or the aluminium titanates powder of cordierite.
Have again, though the ideal particle diameter under the situation of cooperation silicon carbide powder and organic bond as mentioned above, but for example using under Si powder and the situation of silicon carbide powder as inorganic powder, preferably cooperating mean particle diameter is the Si powder of 0.1～10 μ m, silicon carbide powder and the organic bond that mean particle diameter is 5～50 μ m.
In addition, for example, under the situation of the material powder that uses cordierite, the preferred cooperation: mean particle diameter is that talcum powder, the mean particle diameter of 5～60 μ m is the kaolin powder of 1～15 μ m, the alumina powder that mean particle diameter is 0.5～15 μ m, the aluminium-hydroxide powder that mean particle diameter is 0.5～10 μ m, the SiO 2 powder that mean particle diameter is 1～100 μ m, powdered graphite, shaping assistant and the dispersant that mean particle diameter is 1～15 μ m.
In addition, for example, under the situation of using the aluminium titanates powder, preferably cooperating mean particle diameter is that powder and the mean particle diameter of 5～50 μ m is the powder of 0.1～15 μ m.
In the manufacture method of the honeycomb structured body of the present invention of above explanation, owing to use the mixer that on stirring vane, is formed with the high rigidity coating, carry out the mixing of material powder, so it is not easy to wear to constitute the stirring vane of mixer, can not change conveyor screw ground in long-time turns round, can prevent because of the decline of operating efficiency due to the stopping of running and the minimizing of output, and can prevent the increase of cost of equipment.
Embodiment
Hereinafter disclose embodiment and illustrate in greater detail the present invention, but the present invention is not limited in these embodiment.
(embodiment 1)
(1) be that α type silicon carbide powder, the mean particle diameter of 10 μ m is that α type silicon carbide powder and the methylcellulose (organic bond) of 0.5 μ m uses mixer 10 (with reference to Fig. 1) to mix with mean particle diameter.
Be specially, with mean particle diameter is that the α type silicon carbide powder of 10 μ m is put into body from coarse grain groove 11 with the speed of putting into of 1.8kg/min, with mean particle diameter is that the α type silicon carbide powder of 0.5 μ m is put into body from particulate groove 12 with the speed of putting into of 0.7kg/min, methylcellulose is put into body from adhesive groove 13 with the speed of putting into of 0.14kg/min, and with 140min -1(rpm) rotary speed drives conveyor screw, and material powder is carried to outlet 18 when mixing.
Conveyor screw 14 and body 17 that mixer 10 used herein has coarse grain groove 11, particulate groove 12, adhesive groove 13, is made of stirring rod 15 and stirring vane 16, distance between each groove of coarse grain groove 11, particulate groove 12 and adhesive groove 13 is 100cm, stirring rod 15 diameters are 100mm, stirring vane 16 vertically is provided with respect to stirring rod 15, stirring vane 16 width are 25mm, are spaced apart 80mm between the stirring vane 16 in a week around the stirring rod 15.And, on stirring vane 16, be formed with the deposited metal of tungsten carbide with the thickness of 0.3mm in the part of the 10mm of isolated edge portion, be used as high rigidity coating 16a.In addition, the distance that forms between the internal face of the edge part of stirring vane 16 and body is 5mm.In addition, polishing has been implemented on the surface of stirring vane 16, the surface roughness Ra of high rigidity coating part is 8 μ m, and polishing has also been implemented on the surface of stirring rod 15, and its surface roughness Ra is 4 μ m.
And in this operation, when conveyor screw 14 rotation, the upper surface of material powder is positioned at 40% position of the height of body 17.In addition, when being involved in an opposite side observing when carrying material powder whether to surpass stirring rod, not above stirring rod.
(2) in addition lubricant (glycerine) 12kg, plasticizer (the system ユ ニ of Nof Corp. Le one Block) 5.6kg and water 65kg are mixed, modulate mixing material.
Then, use the wet mixed machine that above-mentioned mixing material 5.9kg and the mixed-powder 26.4kg that uses mixer 10 to modulate are mixed, modulate moistening mixture.
(3) next, should carry to extrusion moulding machine by moistening mixture, produce honeycomb formed article by extrusion molding.Then, use microwave dryer to wait and make above-mentioned formed body drying, after becoming the dry body of honeycomb, will be filled in the predetermined through hole with the same encapsulant pastel of forming of above-mentioned moistening mixture.
After reusing the drying machine drying, under 400 ℃, carry out degreasing, in the argon gas atmosphere of normal pressure, under 2200 ℃, carry out three hours fire, thus, produce the following honeycomb fired body that is made of carborundum sintered body: the porosity is 40%, average pore diameter is 12.5 μ m, the size of honeycomb fired body is 34.3mm * 34.3mm * 150mm, and the quantity of through hole (through hole density) is 46.5/cm 2, the thickness that connects hole wall is 0.20mm.
(embodiment 2～4, reference example 1～3)
In the operation of embodiment 1 (1),, produce the honeycomb fired body similarly to Example 1 except such change from coarse grain groove 11, particulate groove 12 and adhesive groove 13 to the amount of putting into of the time per unit of the material powder that mixer 10 is put into as shown in table 1.In addition, observed also whether material powder surpasses stirring rod and be involved in an opposite side when mixing, conveying.
(evaluation of mixer)
For the mixer that in embodiment 1～4 and reference example 1～3, uses, quantitatively discharge test with following method, and estimate the fluctuation of discharge rate.
That is, measure the weight of the mixture of in 30 seconds, discharging from the outlet of mixer, and this mensuration is repeated 10 times, calculate the fluctuation (standard deviation 6) of 10 times discharge rate.
The result is represented in table 1.
Have, quantitatively discharge in the test at this, the fluctuation of this discharge rate is more little, then can mix equably and the transferring raw material powder more.
(strength detection of honeycomb fired body)
For the honeycomb fired body that in embodiment 1～4 and reference example 1～3, obtains, carry out the three-point bending strength test with following method.
That is, be reference with JIS R 1601, service-test machine (イ Application ス ト ロ Application 5582) (U.S.'s Instron corporate system) measures the bending strength (Mpa) of each honeycomb structured body to carry out three point bending test apart from 135mm, speed 1mm/min between span.
The result is represented in table 1.
(the continuous running of mixer)
In one month, carry out the manufacturing of the honeycomb fired body of embodiment 1～4 and reference example 1～3 continuously, and by the visual stirring vane after the continuous running and the wear extent of stirring rod measured.Have, wear extent is measured in the part of wearing and tearing most in stirring vane and stirring rod respectively again.
The result is represented in table 1.
In addition, in the manufacture method that embodiment 1 is correlated with, after turning round one month continuously, also carry out the test of above-mentioned quantitative discharge test and three-point bending strength.Its result represents in table 3.
Table 1
As shown in table 1, as can be known, in the present invention, when conveyor screw rotated, the upper surface of preferred feedstock powder was in 10～50% position of the internal height of body.
This be because, shown in the result of embodiment and reference example 3, less than 10% o'clock, the fluctuation of quantitatively discharging the discharge rate in the test is big, can think that material powder is not mixed equably and carries, the honeycomb structured body of the bending strength ratio embodiment of the honeycomb fired body that consequently produces is poor.
In addition, shown in the result of embodiment and reference example 1,2, when surpassing 50%, the wearing and tearing quantitative change of the stirring rod after the running is big continuously, and material powder surpassed stirring rod when its reason was considered to be in mixing and conveying.Therefore, when surpassing 50%, spirochetal durability variation.
Have, in the present invention, when conveyor screw rotated, the upper surface that is more preferably material powder was in 40～50% position of the internal height of body again.This is because shown in the result of embodiment, quantitatively the fluctuation of discharging in the test becomes littler.
(embodiment 5～7 and reference example 4～5)
The distance that forms between the internal face of the edge part that makes stirring vane and body is the value shown in the table 2, to produce the honeycomb fired body similarly to Example 1.
And, for the honeycomb fired body that these embodiment and reference example relate to, carry out " evaluation of mixer ", " strength detection of honeycomb fired body " and " the continuous running of mixer ".In addition, observe whether material powder surpasses stirring rod and be involved in an opposite side when mixing, conveying.
The result is represented in table 2.Have again, in table 2,, also write down the data of embodiment 1 in the lump in order to carry out reference.
Table 2
Figure A20058005214100281
As shown in table 2, as can be known, in the present invention, the distance that forms between the edge part of stirring vane and the internal face of above-mentioned body is preferably above 3mm and below 10mm.
This be because, shown in the result of embodiment and reference example 4, both distance less than the situation of 3mm under and both distance surpass under the situation of 10mm, the fluctuation of quantitatively discharging in the test becomes big, the intensity variation of the honeycomb fired body that manufactures.
(embodiment 8～10 and reference example 6～7)
Except making the deposited metal of the tungsten carbide that forms as the high rigidity coating on the stirring vane apart from the length of edge part is the value shown in the table 3, produce the honeycomb fired body similarly to Example 1.
And, for the honeycomb fired body that these embodiment and reference example relate to, carry out " evaluation of mixer ", " strength detection of honeycomb fired body " and " the continuous running of mixer ".In addition, after one month continuous running, also carried out the test of quantitative discharge test and three-point bending strength.In addition, observe whether material powder surpasses stirring rod and be involved in an opposite side when mixing, conveying.
The result is represented in table 3.Have again, in table 3, also write down the data of embodiment 1 in the lump for reference.
(reference example 8～9)
Except stirring rod not being polished (reference example 8) or stirring vane not being polished (reference example 9), produce the honeycomb fired body similarly to Example 1.
And, for the honeycomb fired body that these embodiment and reference example relate to, carry out " evaluation of mixer ", " strength detection of honeycomb fired body " and " the continuous running of mixer ".In addition, after one month continuous running, also carried out the test of quantitative discharge test and three-point bending strength.In addition, observe whether material powder surpasses stirring rod and be involved in an opposite side when mixing, conveying.
The result is represented in table 3.
(comparative example 1)
Except not forming the high rigidity coating on the stirring vane and stirring vane not being implemented polishing, produce the honeycomb fired body similarly to Example 1.
And, for the honeycomb fired body that these embodiment and reference example relate to, carry out " evaluation of mixer ", " strength detection of honeycomb fired body " and " the continuous running of mixer ".In addition, after one month continuous running, also carried out the test of quantitative discharge test and three-point bending strength.In addition, observe whether material powder surpasses stirring rod and be involved in an opposite side when mixing, conveying.
The result is represented in table 3.
Table 3
(notes) are the surface roughness of having implemented the stirring vane main body of polishing.
As shown in table 3, as can be known, in the present invention, the length of preferred deposited metal is 7～20mm, and preferably stirring rod and stirring vane is implemented polishing respectively, and surface roughness Ra is preferably respectively below the 4 μ m, below the 8 μ m.
This be because, from embodiment and reference example 6 more as can be known, when the curtailment 7mm of deposited metal, the degree of the wearing and tearing of stirring vane is big, and the fluctuation in the quantitative discharge test after the running is compared with initial value significantly and increased continuously, from embodiment and reference example 7 more as can be known, when the length of deposited metal surpassed 20mm, the lubricity of stirring vane descended, so material powder will be above stirring rod when mixing and carry, it is big that the degree of the wearing and tearing of stirring rod becomes, the durability variation.
In addition, also because, from embodiment and reference example 8,9 more as can be known, under the situation of stirring rod and stirring vane not being implemented respectively to polish, the fluctuation of quantitatively discharging in the test becomes big, this tendency is becoming remarkable after turning round continuously.And its reason is considered to, and stirring rod and stirring vane is being implemented polishing, and under the big situation of its surface roughness, material powder can be attached on stirring rod and the stirring vane, thus hindered uniform mixing and conveying, and the easier aggravation of wearing and tearing.
In addition, from embodiment shown in the table 3 and comparative example more as can be known, when not forming on the stirring vane under the situation of deposited metal, the development speed of wearing and tearing is exceedingly fast, the non-constant of durability, the continuous running through about month has become the state that is unsuitable for using as can be known.

Claims (16)

1. the mixed method of a powder is the mixed method of carrying out the powder of the mixing of at least a powder and conveying, it is characterized in that,
Above-mentioned at least a powder is put in the mixer, is made the stirring rod rotation of above-mentioned mixer, above-mentioned at least a powder is moved when mixing,
Wherein above-mentioned mixer has: conveyor screw, and it is made of above-mentioned stirring rod and stirring vane, and is center rotation with above-mentioned stirring rod; And body, its be arranged on above-mentioned spirochetal around, above-mentioned stirring vane integral body forms with high hardness components, perhaps is formed with the high rigidity coating at least a portion of above-mentioned stirring vane.
2. the mixed method of powder according to claim 1 is characterized in that,
Above-mentioned at least a powder contains inorganic powder and organic dust.
3. the mixed method of powder according to claim 2 is characterized in that,
As above-mentioned inorganic powder, it contains the different two or more powder of particle diameter, and,
After putting into above-mentioned inorganic powder, put into organic dust according to particle diameter order from big to small.
4. according to the mixed method of each the described powder in the claim 1 to 3, it is characterized in that,
The main component of above-mentioned high hardness components or above-mentioned high rigidity coating is a tungsten carbide.
5. according to the mixed method of each the described powder in the claim 1 to 4, it is characterized in that,
The distance that forms between the edge part of above-mentioned stirring vane and the internal face of above-mentioned body is above 3mm and below 10mm.
6. according to the mixed method of each the described powder in the claim 1 to 5, it is characterized in that,
The surface roughness Ra of above-mentioned high hardness components or above-mentioned high rigidity coating is below 8 μ m.
7. mixer, it moves the mixture of powders that contains at least a powder when mixing, and this mixer has: conveyor screw, it is made of stirring rod and stirring vane, and is the center rotation with above-mentioned stirring rod; And body, its be arranged on above-mentioned spirochetal around, above-mentioned mixer is characterised in that,
Above-mentioned stirring vane integral body forms with high hardness components, perhaps is formed with the high rigidity coating at least a portion of above-mentioned stirring vane.
8. mixer according to claim 7 is characterized in that,
The main component of above-mentioned high hardness components or above-mentioned high rigidity coating is a tungsten carbide.
9. according to claim 7 or 8 described mixers, it is characterized in that,
The distance that forms between the edge part of above-mentioned stirring vane and the internal face of above-mentioned body is above 3mm and below 10mm.
10. according to each the described mixer in the claim 7 to 9, it is characterized in that,
The surface roughness Ra of above-mentioned high hardness components or above-mentioned high rigidity coating is below 8 μ m.
11. the manufacture method of a honeycomb structured body; It is the manufacture method of such honeycomb structured body: mixing and carrying after the mixing of the material powder that contains at least a ceramic powders carries operation; The mixing material raw material modulates moistening mixture again in the mixture of this material powder; By this moistening mixture that is shaped; Make a large amount of through holes across the honeycomb formed article that connects the column that hole wall is set up in parallel at longitudinally; This honeycomb formed article is fired; Produce the honeycomb structured body that is consisted of by the honeycomb fired body; It is characterized in that
Carry in the operation in above-mentioned mixing, the above-mentioned raw materials powder put in the mixer, make the stirring rod rotation of above-mentioned mixer, the above-mentioned raw materials powder is moved when mixing,
Wherein above-mentioned mixer has: conveyor screw, and it is made of above-mentioned stirring rod and stirring vane, and is center rotation with above-mentioned stirring rod; And body, its be arranged on above-mentioned spirochetal around, above-mentioned stirring vane integral body forms with high hardness components, perhaps is formed with the high rigidity coating at least a portion of above-mentioned stirring vane.
12. the manufacture method of honeycomb structured body according to claim 11 is characterized in that,
The above-mentioned raw materials powder contains ceramic powders and organic dust.
13. the manufacture method of honeycomb structured body according to claim 12 is characterized in that,
As above-mentioned ceramic powders, it contains the different two or more ceramic powders of particle diameter, and,
After putting into above-mentioned inorganic powder, put into organic dust according to particle diameter order from big to small.
14. the manufacture method according to each the described honeycomb structured body in the claim 11 to 13 is characterized in that,
The main component of above-mentioned high hardness components or above-mentioned high rigidity coating is a tungsten carbide.
15. the manufacture method according to each the described honeycomb structured body in the claim 11 to 14 is characterized in that,
The distance that forms between the edge part of above-mentioned stirring vane and the internal face of above-mentioned body is above 3mm and below 10mm.
16. the manufacture method according to each the described honeycomb structured body in the claim 11 to 15 is characterized in that,
The surface roughness Ra of above-mentioned high hardness components or above-mentioned high rigidity coating is below 8 μ m.
CNA2005800521417A 2005-12-26 2005-12-26 Powder mixing method, agitator and manufacturing method of cellular construction body Pending CN101312810A (en)

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