CN86108899B - Process for manufacture of metal sinter - Google Patents
Process for manufacture of metal sinter Download PDFInfo
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- CN86108899B CN86108899B CN198686108899A CN86108899A CN86108899B CN 86108899 B CN86108899 B CN 86108899B CN 198686108899 A CN198686108899 A CN 198686108899A CN 86108899 A CN86108899 A CN 86108899A CN 86108899 B CN86108899 B CN 86108899B
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Abstract
The present invention relates to a manufacturing process for a metal sintered body, which is characterized in that the process comprises the following steps that: 70 to 90 Wt% of self-melting alloy powder is mixed with 10 to 30 Wt% of high-melting-point metal powder with higher melting point than the self-melting alloy powder, while the self-melting alloy powder easily adheres to the high-melting-point metal powder so as to obtain metal powder with sintering characters; a material is used, and 1 to 10 wt% of plastic binding agent in the material and the metal powder with sintering characters are kneaded together so as to obtain a moulding body with a scheduled shape; the moulding body is sintered at a temperature beyond the liquidus of the self-melting alloy powder.
Description
The present invention relates to manufacture the method for metal sinter.
While manufacturing metal sinter in the past, proposed a kind of manufacturing process, it comprises and uses plastification material one to make one plastification material is configured as to predetermined shape by having the metal powder of sintering character and plastic binder; Make the thermal decomposition of plasticity bonding agent sintering metal powder in formed body.
In said method, unless adopted some method for supporting when metal powder sintered, sintered body can cause change in size because of expansion.Before and after sintering, may produce approximately 4% deviation.There is a kind of self-fluxing alloy powder as the metal powder that has sintering character, for example the Ni self-fluxing powder of Ni-B-Si system.But the solidus of this alloy is 1010～1020 ℃.Liquidus curve is 1075 to 1085 ℃.When sintering is while carrying out in the humidity province lower than solidus, it is good keeping the performance of shape, but sintering strength is low, otherwise when sintering is in the time carrying out higher than liquidus temperature district, all powder smeltings mobile consequently shape maintains performance deteriorations.
In view of the above, sintering is to carry out under the proper temperature between between solidus and liquidus curve, such as near a certain temperature 1050 ℃ is carried out.
But for the situation of carrying out sintering in this temperature, sintered body is because the variation of size appears in contraction, dimensional accuracy reduce and sintering strength not high.
In addition, also proposed a kind of method, now above-mentioned plastification material is configured as plate to make a kind of plate of material, with this plate with obtain metal sinter.But in the case, depending on the quality of plastic binder, the pile performance of plate of material worsens, and therefore occurs the splitting problem of formed body, and cracks.
An object of the present invention is to provide the manufacture method of being put forward above, it can obtain aforesaid metal sinter, the dimensional accuracy that this sintered body has had and high intensity.Another object of the present invention is to provide aforesaid manufacture method, and this method is with the expansion of easy method control metal sinter.
For achieving the above object, according to a method of making metal sinter provided by the invention, the method comprises mixes the self-fluxing powder of 70～90wt% with the high-melting metal powder of 10～30wt%, the fusing point of this high-melting metal powder is higher than certainly molten metal powder, and, this self-fluxing powder is easy to adhere to thereon, obtains so a kind of metal powder that has sintering character; 1～10wt% plasticity bonding agent a kind of material that kneading face becomes together with the described metal powder with sintering character has been obtained to the moulded body with definite shape; Belonging to this moulded body of liquidus temperature sintering higher than described self-fluxing alloy.
Moreover, according to the method for a manufacture metal sinter provided by the invention, the method comprises the following steps: mix the self-fluxing powder of 70～90wt% and the high-melting metal powder of 10～30wt%, high-melting metal powder is than having higher fusing point from molten metal powder, and, self-fluxing powder is easy to adhere in the above, thereby obtains the metal dust with sintering character; Use the material being become with the above-mentioned powder kneading with sintering character by 1～10wt% plastic binder to obtain the moulded body with definite shape: in the temperature that exceedes self-fluxing powder liquidus curve, and at moulded body surface this moulded body of sintering under the topped state of supporter.
In addition, according to the invention provides a method of manufacturing metal sinter, the step that the method comprises is for to be configured as predetermined shape to obtain a moulded body by plastification material, has together with the metal powder of sintering character rubbed with plastic binder in plastification material; With topped this moulded body of granular supporter; Make the plastic binder in this moulded body bear thermal decomposition the above-mentioned metal powder of sintering.
Because the fusing point of ormal weight mixes with self-fluxing powder as stated above higher than the high-melting metal powder of self-fluxing powder, even if self-fluxing powder is exceeding its liquidus temperature sintering, flowing of this self-fluxing alloy also weakened by high-melting metal powder, may obtain whereby and have good shape maintenance and the metal sinter of dimensional accuracy.In addition, may obtain a kind of metal sinter, between its self-fluxing alloy, binding ability is good, and winding between self-fluxing alloy and high-melting metal powder and adhere to well, thereby this sintered body has high intensity.
Moreover, because the plastic binder of aforementioned ormal weight and the mixture of self-fluxing alloy and high-melting metal powder are blended together, when even forming pressure is low, also can obtain the good moulded body of conformal.Be linked to be overall in the situation that at metal sinter and base metal, likely easily carry out the adhesion of mixed powder and base metal, the shaping of mixed powder and similar work.
Further, because the moulded body obtaining from the mixture of self-fluxing powder and high-melting metal powder is sintering under the topped state of its surperficial supported body, the change in size of metal sinter in supporter control, further improves dimensional accuracy.
In addition, can control metal sinter because the change in size that causes of expanding is to obtain the good metal sinter of dimensional accuracy with graininess supporter around the very easy method of plastification material moulded body.
Because cracking resistance is good and two kinds of good thermoplastic synthetic resins of pile performance are included in the plastic binder of plate of material, in the moulded body being obtained by plate of material, not producing splitting does not have crackle to produce yet.Can obtain such moulded body, it has good plunger bond strength and good surface quality, also can obtain the metal sinter that dimensional accuracy and surface quality are good.
Moreover, in plate of material manufacture process, the metal powder that has a sintering character with have aforementioned special quality liquid plastic binder integrated together with to obtain plastification material, then, plastification material is heated and dry quick-fried, is coated with and applies a small amount of plastic binder equably whereby on the metal powder with sintering character.Equably plastic binder is coated in as stated above and on the metal powder of sintering character, makes likely to obtain shape in the plate forming process below and keep good plate.Use a small amount of plastic binder also can obtain the metal sinter that porosity is little, intensity is high.
Plastification material thermoplastic state compacted under be plate to be conducive to its shaping and can to obtain such plate of material, it have at normal temperatures suitable flexible and anti-in lancinating and processing characteristics good.
More above-mentioned and other objects of the present invention, feature and advantage can obviously be found out from some embodiment that select.These embodiment describe in detail in connection with accompanying drawing.
Fig. 1 to 3 expression according to a first embodiment of the invention.Fig. 1 is the profile of a pressing mold, and Fig. 2 illustrates the making step of this pressing mold.Fig. 3 is the curve map that represents sintering phase temperature and time relationship.
Fig. 4 illustrates in the present invention the sintering process of three moulded bodies in second embodiment.
Fig. 5 illustrates the making step of pressing mold in third embodiment of the invention.
Fig. 6 is the zoomed-in view of metal sinter microphoto (400 times).
Fig. 7 is the curve map that represents sintering temperature and change in size relation.
In the metal powder that has sintering character using in the present invention, self-fluxing powder comprises N i system, Co system, Fe system and fellow.In order the sintering temperature of self-fluxing powder to be set in higher than temperature more than this aluminium alloy phase line to improve the intensity of metal sinter.Added the refractory metal powder that fusing point is higher than self-fluxing powder and self-fluxing powder is easily deposited thereon, as the metal powder that self-fluxing alloy is had to sintering character, with refractory metal weaken self-fluxing alloy flow to improve shape maintains characteristic.There is in this case dystectic metal dust and comprise MO, W, stainless steel WC, Fe-Mo (molybdenum-iron) powder or their mixture.
Example 1 (using described plate of material to manufacture pressing mold)
Fig. 1 represents to manufacture the pressing mold of a casing, and this mould is made up of with working portion 3 steel-casting (plate matter is JISSC46) of base material 2.3 are made up of the metal sinter S being attached on base material 2.
As shown in Fig. 2 (a), the basal plane 2a of base material 2 is than the low 5～20mm of the outer surface of the working portion of mould 13 (dotting).Base material 2 is foundry goods and is to use, and need, through blasting treatment and cleaning, then coat acrylic acid synthetic resin adhesive in the above with the basal plane 2a of steel ingot phosphorus line.
As shown in Fig. 2 (b), three bulk flitch 4 (every thick 3mm) are stacked in together, are bonded on basal plane 2a; Plate of material 4 is installed in Mold for Plastics in press or similar machine suppresses to check the engagement of mould M and plate of material.If mould M engages on many points with plate of material 4, plate 4 can be repaired.If do not engaged, plate of material 4 needs again bonding.Repeatedly with mould M pressurization, and repair adhesives plate 4 shape of laminated material flitch 4 is conformed to completely with the shape of mould M.The laminated material flitch 4 being so pressed into has good interlayer bonding strength and surface property, does not have crackle to produce, and in this case, the pressure of mould M is 0.2-0.3kg/mm
2.
As shown in Fig. 2 (C), laminated material flitch 4 and base material 2 are all placed in heating furnace 5, are heated to 80 ℃ and make 4 plasticising of laminated material flitch.
As shown in Fig. 2 (d), the plate of material 4 of a thickness 3m m is stacked in and is bonded on plasticising laminated material flitch 4, and the stacking material plate 4 obtaining is imposed 0.7kg/mm by mould M
2pressure mould is pressed into moulded body 3a, and it and working portion 3 have same shape.
In the case, for mould M and moulded body 3a have good demolding performace, on mould M, coat talcum powder or in mould M and laminated material flitch 4, put one deck film as thin as a wafer, as poly-inclined to one side two vinyl chlorides, polyvinyl chloride, PEF resin etc.
After forming process finishes, base material 2 and moulded body 3a are cooled to normal temperature, and the upper unnecessary part of moulded body 3a is removed.
As shown in Fig. 2 (e), it is upper that the alumina plate 6 of thick 1mm overlays moulded body 3a, and base material 2 is placed in container 7, and the steel ball (8) (8) that diameter is 0.75mm is simultaneously used as backing material and puts into container 7.Aluminium sheet 6 forms by aluminium powder with similar synthetic resin adhesive noted earlier, and its effect is to stop the rugged rough surface of countless steel balls (8) formation to be transferred on metal sinter to degenerate with the surface roughness that prevents metal sinter S.Steel ball 8 is borrowed its weight to carry out controlling dimension to change, and when namely Ni self-fluxing powder adds M o powder and carries out sintering, the expansion of metal sinter S will be narrated later.
Next step, above-mentioned base material 2 be placed in vacuum sintering furnace 9 in case under heating one cooling condition shown in Fig. 3 decomposing organic matter sintering Ni self-fluxing alloy and molybdenum powder.Heat-carrying gas used is nitrogen or the hydrogen with height reproducibility.
(A) first thermal treatment zone (Fig. 3 A)
This thermal treatment zone A is from normal temperature to 650 ℃, and temperature rise rate is 10-20 ℃/point.First evaporated at thermal treatment zone A water, four fluorine ethylenes and the acrylic resin that are then closed in araldite at moulded body 3a and aluminium sheet 6 decompose and gasify.Synthetic resin gasifies but considers thermal conductance at 300～400 ℃, and insulation, at 600～650 ℃, 90 minutes, leaves Ni self-fluxing alloy-Mo powder to remove most organic matter.The variation that contrasts the interior vacuum of vacuum sintering furnace (9) is narrated in organic gasification.When normal temperature vacuum be 1 but 650 ℃ of insulations 90 minutes time vacuum drop at most 2.This is mainly that within 90 minutes, final vacuum degree rises to again 1 because the cracked gas that organic matter produces causes.This shows that cracked gas discharges from vacuum sintering furnace.
(B) second thermal treatment zone (Fig. 3 B)
This thermal treatment zone B is from 900～1000 ℃, and Ni self-fluxing alloy-Mo powder the temperature insulation lower than Ni self-fluxing alloy solidus (1010～1020 ℃) 30 minutes, for example, is 950 ℃ for solid-phase sintering process, and then this powder is got up by temporary transient sintering.The speed that temperature rises from the first thermal treatment zone A is 10～20 ℃/point.In vacuum sintering furnace 9, Ni self-fluxing alloy-Mo pruinescence heat temperature raising is from surface, so need to be through predetermined time heating until whole powder reaches uniform temperature.If be sharply heated to 1000～1200 ℃ of sintering temperatures, the surface part of Ni self-fluxing alloy-Mo powder can produce the temperature difference with the part that contacts matrix surface 2a, this not only increases the scrambling of hole, can not obtain uniform metal sinter and cause defect, such as ftractureing after sintering.
In the second thermal treatment zone B, uncracked organic matter is gasified totally and is removed.Because the vacuum in the reason vacuum sintering furnaces 9 such as above-mentioned gasification temporarily drops to 4.But go back up to again 1 after 30 minutes.
(C) the 3rd thermal treatment zone (Fig. 3 C)
This thermal treatment zone 3 be just lower than Ni self-fluxing alloy solidus (1010 to 1020 ℃) to the temperature range that exceedes liquidus curve (1075～1085 ℃), from 1000～1200 ℃.After the interim sintered body of Ni self-fluxing alloy and Mo, 1100～1180 ℃ keep 120 minutes higher than the quiet heat level of liquidus curve is upper.Preferably select 1160 ℃ for the liquid sintering process that Ni self-fluxing alloy is melted form metal sinter.Therefore Ni can obtain good shape retention energy from flowing of burnt together gold because the existence of Mo weakens in this case.The speed that temperature rises from the second humidity province B is 15～20 ℃/point.Because the interim sintered body of Ni self-fluxing alloy-Mo has been heated to high temperature at the second thermal treatment zone B, be short so temperature is raised to the time of the 3rd thermal treatment zone C.If the time stopping at the 3rd thermal treatment zone C not, sintering can not improve and carry out, and in metal sinter S, causes defect.
Sintering temperature is chosen as the reason of 1160 ℃: in the time that sintering temperature is 1200 ℃ of left and right, the change in size of sintered body C increases; Furnace temperature is wayward; In addition furnace temperature is inhomogeneous.1160 ℃ are applicable to, and can eliminate these not convenient conditions.
(D) cooling zone (Fig. 3 D)
This cooling zone is divided into the first cooling zone (from above-mentioned sintering temperature to 800 ℃ left and right), the second cooling zone D
2(left and right from 800 ℃ to 400 ℃), the 3rd cooling zone D
a(from 400 ℃ of left and right to normal temperature).
The first cooling zone D
1it is a stable region under metal sinter S high temperature.At cooling zone D
1in avoid as far as possible thermal excitation, consider at the same time cooling effectiveness, therefore cooling velocity is low, such as being 2 ℃/min to the maximum.If at cooling zone D
1cooling very soon, usually in metal sinter S, crack.
At the second cooling zone D
2, cooling velocity is slower, is 3 ℃/min to the maximum, with absorb base material 2 line expand and transition process in change in size.The linear shrinkage of metal sinter S is 14.6 × 10-in this case
but the contraction of the base material 2 that hole causes in addition.At cooling zone D
2in the quick metal sinter S that is everlasting when cooling, crack.
The 3rd cooling zone D
2in, metal sinter S and matrix material 2 are cooled to normal temperature, are air cooling (comprising that air is cooling) rather than make water, oil ... etc. liquid cools.
Can obtain the mould 1 shown in Fig. 1 by above-mentioned heating one cooling procedure, its die work district 3 is that the metal sinter S being formed by Ni self-fluxing alloy-Mo is shaped and makes.
Above-mentioned sintered body S has good adhesion property to base material 2, does not have crackle and so on defect to produce.Use 3 three-dimensional measuring machines to measure appearance and size to compare with mould M at X and y direction at interval of 50 millimeters.Suppose that mould 1 lengthwise dimension is 300 millimeters, lateral dimension is 250 millimeters and height is 180 millimeters.Find that there is 5 millimeters of three places maximum swellings, other local expansions 0～0.3 millimeter, demonstrate good dimensional accuracy.Because being used for preventing the coarse surface of steel ball 8, alumina plate 6 transfers on the laminated material of mold pressing the surface roughness that sintered body S obtains.
Certainly the mould 1 obtaining by said process can be directly used in pressure processing after simple finishing.
The following step manufacture of above-mentioned alumina plate 6 use.
It is in the alumina powder of 2～50um that the araldite 8 that 8wt% is similar to manufacture previous materials plate adds diameter, and the two is rubbed device and rub up at normal temperatures 5 minutes with desk-top mixing, and mixes and stirs and in material, has added 3wt% water.
Gained plastification material is heated to 120 ℃ with heater, stops 60 minutes, and the water in synthetic binder is made plastification material dry by evaporation.
After dry, heating remains on 80 ℃ of left and right, makes to be shaped to manufacture in the plastification material of thermoplastic state the alumina plate 6 of 1 millimeters thick with milling train, and forming process used and milling train are identical with production previous materials plate person.In said process, as rolling mill roll is heated to and the much the same temperature of plastification material (approximately 80 ℃), the shaping of plate can easily complete.
Shaping rear oxidation aluminium sheet 6 is at 80 ℃, and heat treatment in 30 minutes is to eliminate the tension force producing in shaping.
Example 2. (with described plate of material manufacture sliding part)
Be of a size of the each 100mm of length and width, the cold-rolled steel sheet of thick 1.5mm, after oil removal treatment, is bonded at the previous materials plate of two thick 3mm on this steel plate with acrylic acid adhesive, and plate of material surface is processed smooth to obtain a tabular moulded body.
The moulded body obtaining is placed on the sintering that carries out organic decomposition and Ni self-fluxing powder and Mo powder in vacuum sintering furnace, and it heats, and cooling condition is to similar shown in Fig. 3 one by one, and sintering time is 30 minutes.
The laminated body being made up of steel plate and metal sinter that obtains through above-mentioned steps is drilled many holes are to make the sliding part in order to light load, and metal sinter is as sliding surface.
The sliding surface surface roughness that this sliding part is made up of metal sinter is good, has good sliding capability, so simultaneously metal sinter sticks to well and do not produce splitting on steel plate.In the case for the greasy property of improving metal sinter preferably immerses lubricating synthetic resin in sintered bodies as four fluorine ethylenes, sclerosis therein; Or by kollag as WS
2, MoS
2deng sneaking into plate of material.
In order to increase above-mentioned sliding part metal sintering body thickness, plate of material thick 3mm can be adhered on sintered body with acrylic resin binding agent, its Surface Finishing is smooth, and after this its sintering process is similar to aforementioned double-deck metal sinter sliding part.
In this sliding part, two sintered bodies adhere to well, and splitting does not in use occur.
Example 3 (with described plate of material manufacture sintered body)
Said plate of material is used to molded cylindrical die laminate 10 above
1～10
a, diameter 20mm, long 20mm, pressure 1kg/mm
2, they will carry out sintering.
In sintering process, to moulded body 10
1it is placed into container 11, as shown in Fig. 4 (a1), and moulded body 10
1by 12 of steel balls as granular supporter around, bulb diameter is 0.5-Imm, line is expanded to 11 × 10
-6/ ℃.Container 11 is placed in vacuum sintering furnace 9.
For moulded body 10
2, as Fig. 4 (a
2) shown in put into like that container 11, moulded body 10
2by 13 of No.5 silica sands around, sand is as granular supporter, its line is expanded to 4 × 10
-6/ ℃, container is placed in vacuum sintering furnace 9.
For moulded body 10a, it is to put into vacuum sintering furnace and without backing material, as shown in Fig. 4 (a3).
The sintering of organic decomposition and metal powder is by heating a cooling condition operation shown in Fig. 3.At Fig. 4 (a
1) and (a
2) situation under, because the steel ball 12 as backing material and silica sand 13 are granular, the gas that synthetic resin S is decomposed to form is from supporter loss by countless continuous holes between steel ball and silica sand 13, preferably sintering temperature is 1,120 ℃.
With respect to before and after sintering process, made by above-mentioned steps three sintered bodies have been measured to percentage elongation, its result example enters Table I.Sintered body S in table
1to S
3respectively corresponding to moulded body 10
1to 10
3.
Table I
| Sintered body | Percentage elongation |
| ??S 1 | ??2.2％ |
| ??S 2 | ??0.9％ |
| ??S a | ??3.7％ |
Can obviously find out sintering moulded body 10 from Table I
1to 10
atime, the sintered body S that uses supporter 12 and 13 to obtain
1and S
2expand and be restricted because be subject to the pressure of supporter 12 and 13 during sintering.Thereby become the sintered body S that obtains of support body with not using
acomparing its percentage elongation reduces greatly.
Example 4 (manufacturing pressing mold for described plate of material)
As shown in Fig. 5 (a), be the similar cast steel foundry goods (material JISSC46) of example 2 above for the base material 2 of casing.Due to base material be again foundry goods and with cross, have the basal plane 2a of phosphorus skin after cleaning, to be coated with last layer acrylic acid viscose glue.
As shown in Fig. 5 (C), base material is placed into again container 7 and puts into vacuum sintering furnace 9, under heating one cooling condition of Fig. 3, makes organic substance decomposing sintering Ni self-fluxing alloy one molybdenum powder in moulded body 3a.
As shown in Fig. 5 (d), obtain mould 1 through above-mentioned steps, its working portion 3 includes the Ni self-fluxing alloy-M on the basal plane 2a that is positioned at substrate material 2
osintered body S
4.Using three-dimensional measuring machine to measure the percentage elongation of X to front and back, the each position of Z to through-thickness on mould 1 working portion 3, can obviously find out thus, is 0.2mm at position X deflection; Position y deflection is 0.5m m; And at position Z, deflection is 0.9, metal sinter S
4change in size be greatly subject to the restriction of supporter 12.
The supporter that can use comprises above-mentioned steel ball, and silica sand also has ball-aluminium oxide, spherical ceramic etc. in addition.If necessary, the available inorganic bond such as steel ball makes the coincide shape of moulded body of supporter as waterglass partly sticks together.Shown in Fig. 5 (b), in step, the shaping of moulded body 3a is not limited only to use the situation of mould M, also can make plate of material 4 be semi-harden state and then polish.
Example 5,
The molybdenum powder of the Ni self-fluxing powder of 80wt% diameter 10～60 μ m and diameter 10～53u m of 20wt% is mixed into mixed powder.
The preparation of araldite is that four fluorine ethylene emulsions are mixed in 1: 1 ratio with acrylic acid emulsion.This araldite is added in above-mentioned mixed powder by the amount of 1.5wt%, rubs well and mixes to obtain plastification material.This plastification material is put into the inherent 0.5kg/mm Forming under Pressure of mould, obtains the cylinder mold laminate of the long 20mm of diameter 20mm.
This moulded body is put into vacuum sintering furnace and carries out the sintering of organic decomposition and metal powder, and heating one cooling condition is as Fig. 3.At this moment sintering temperature is 1120 ℃, and it is higher than the liquidus curve of nickel self-fluxing powder.Sintering time is 20 minutes.From above-mentioned forming process, can obtain metal sinter whereby.
Routine I in contrast, has used containing the above-mentioned Ni self-fluxing powder of 91wt% and 9wt% above-mentioned Mo powder and the above-mentioned araldite of 1.5wt% and has suppressed cylinder mold laminate, and this moulded body size is identical with aforementioned metal sintered body, and sintering condition as hereinbefore.Moreover, example 2 in contrast, suppress cylinder mold laminate with araldite described in the mixed powder containing Mo powder described in Ni self-fluxing powder described in 69wt% and 31wt% and 1.5wt%, its size is identical with metal sinter noted earlier, and sintering condition as previously mentioned.
Conformal performance, change in size and sintering strength are contrasted aforementioned sintered body and are checked, and its result is listed Table II in.
Table II
Obviously find out from Table II, only show that by the metal sinter that the present invention obtained micro-expansion and dimensional accuracy and conformal performance are all good.
Fig. 6 is the zoomed-in view of the metal sinter optical microstructure photo (400 times) that makes by the present invention.In figure, mark alphabetical m and represent M
oand n represents Ni self-fluxing alloy.Mutual coupling performance simulating and the M of Ni self-fluxing alloy itself as apparent from Fig 6
oand between Ni self-fluxing alloy around with adhesion property be all good.Therefore the intensity of metal sinter is high, for example, obtained 4kg/mm
2compressive strength.
For the compressive strength synthetic resin that improves metal sinter as epoxy resin can vacuum impregnation in the hole of sintered body, then hardened.Carrying out this technique is in order to guarantee 7kg/mm
2compressive strength.For requiring compressive strength can, by low-melting-point metal as Cu, to melt and then immerse metal sinter higher than the situation of above-mentioned value.
Example 6:
Aforementioned 1.5wt% araldite is added to 80wt%Ni self-fluxing powder, in the mixed powder of 20wt% molybdenum powder, manufacture multiple diameter 20mm, the cylinder that length is 20mm, their composition, shape and size and routine V
1identical.
Wherein the surface of some moulded body becomes with refractory material hull shape, and refractory material has tiny continuous hole, as supporter.The making of housing is by natural drying obtained mucous membrane in the slurries of moulded body immersion height viscous.Then 100 ℃ of heated dryings 1 hour.The acquisition of slurries is to join alumina powder as inorganic binder in the aqueous suspension of the zirconium silicon oxide hydrochlorate of refractory material.
For relatively, make same shape and size but only contained the moulded body of Ni self-fluxing powder as metal powder.
Sintering temperature when Fig. 7 represents this moulded body sintering and the change in size of metal sinter.Line a
1contain Ni self-fluxing alloy and M corresponding to metal sinter
oand uncanned situation, line a
2mean metal sinter composition and line a
1similar and the chlamydate situation of representative, the situation of line b is that metal sinter only contains Ni self-fluxing alloy.
In the drawings, 1100～1180 ℃ of sintering temperature districts that indicate at oblique line, the switching performance between Ni self-fluxing alloy and this alloy and M
obetween winding and adhesion property be all good, and in this humidity province, to line a
1representative without its change in size of shell metal sinter be limited in+1～+ 3%, in (expansion), to line a
2in situation, being with shell metal sinter is +0.5% or less (expansion).The reason that metal sinter change in size is subject to the constraint of shell is as mentioned above, the metal sinter making by the present invention has the tendency of expansion and this expansion is weakened by the buttressing effect of shell.
On the other hand, the metal sinter of line b is only contained to the situation of Ni self-fluxing alloy, apparent, if to carry out at 1040 ℃ be that a change in size causing due to contraction is first revealed between solidus and liquidus curve to sintering one by one as old technology.
Situation for the present invention for making pressing mold, uses the plastification material that example 6 methods obtain to be adhered to matrix material as cast iron above, cast steel, and on steel alloy material like that, this plastification material is moulded to and gives fixed shape, after this toasts.
In the case, because the processing characteristics of plastification material is good, its bonding and forming technology can be easy to.
Meanwhile, in above-mentioned example, araldite is added in the mixed powder of self-fluxing powder and high-melting metal powder formation, is noted that and does not even add araldite, still can obtain the body of powder that moulded body is suppressed one by one.
Claims (13)
1. the included step of method of manufacturing metal sinter is to obtain with the metal dust with sintering character the moulded body that has reservation shape, described in sintering, moulded body is to obtain this metal sinter, the feature of the method is the high melting-point metal powder that the steps include: to mix 70-90Wt% self-dissolving alloyed powder and 10～30wt%, the latter's the molten molten point than described self-dissolving alloyed powder is high, and described self-dissolving alloyed powder is easy to stick on high melting-point metal powder, the moulded body of mixed metal powder described in sintering in the temperature that exceedes this self-dissolving alloyed powder liquidus curve, by the plastic binder of 1～10w t% be thermoplastic synthetic resin with described metal powder rub mix together with to obtain the moulded body with reservation shape.
2. according to the method for manufacture metal sinter claimed in claim 1, it is characterized in that in the time of sintering described in the surface supporter of moulded body topped.
3. according to the method for the manufacture metal sinter described in claim 1 or 2, it is characterized in that described self-dissolving alloyed powder is Ni self-dissolving alloyed powder, any in Fe self-dissolving alloyed powder and Co self-dissolving alloyed powder.
4. according to the method for manufacture metal sinter claimed in claim 1, it is characterized in that described high melting-point metal powder is Mo, W, stainless steel, the one in WC, Fe-Mo (molybdenum-iron).
5. according to the method for manufacture metal sinter claimed in claim 1, it is characterized in that described high melting-point metal powder is the mixture by the two or more metal powders of selecting from Mo, W, stainless steel, WC, Fe-Mo (molybdenum-iron).
6. according to the method for the manufacture metal sinter described in claim 1 or 2, it is characterized in that described araldite is the mixture of tetrafluoro resin emulsion and acrylic resin.
7. according to the method for the manufacture metal sinter described in claim 2 or 3, it is characterized in that described supporter is the one in steel ball, silica sand, ball-aluminium oxide and spherical ceramic.
8. according to the method for manufacture metal sinter claimed in claim 7, it is characterized in that alumina plate is placed between described moulded body and supporter.
9. according to the method for the manufacture metal sinter described in claim 2 or 3, it is characterized in that described supporter is a shell that material hard to tolerate is made.
10. the method for manufacture metal sinter according to claim 9, it is characterized in that described supporter is formed by high viscosity slurries, these slurries are that the alumina powder of inorganic binder is added as the water suspension of the zirconium silicon oxide hydrochlorate of refractory material and made.
11. a kind of methods of manufacturing metal sinter according to claim 2 comprise the steps: to rub and mix a kind of plastification material having the metal powder of sintering character and plastic synthetic resin binding agent; Described in mold pressing, plastification material becomes reservation shape to obtain a moulded body; Support and make the described araldite thermal decomposition in this moulded body around this moulded body by graininess, thereby described in sintering, metal powder obtains metal sinter.
The method of 12. manufacture metal sinters according to claim 11, is characterized in that described graininess supporter comprises the one in steel ball, silica sand, ball-aluminium oxide and spherical ceramic.
13. according to the method for the manufacture metal sinter described in claim 11 or 12, it is characterized in that alumina plate is placed between described moulded body and graininess supporter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN198686108899A CN86108899B (en) | 1986-12-30 | 1986-12-30 | Process for manufacture of metal sinter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN198686108899A CN86108899B (en) | 1986-12-30 | 1986-12-30 | Process for manufacture of metal sinter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN86108899A CN86108899A (en) | 1987-11-11 |
| CN86108899B true CN86108899B (en) | 1988-08-10 |
Family
ID=4804096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN198686108899A Expired CN86108899B (en) | 1986-12-30 | 1986-12-30 | Process for manufacture of metal sinter |
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| Country | Link |
|---|---|
| CN (1) | CN86108899B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170120339A1 (en) * | 2014-05-13 | 2017-05-04 | Metalvalue Sas | New powder metal process for production of components for high temperature useage |
-
1986
- 1986-12-30 CN CN198686108899A patent/CN86108899B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN86108899A (en) | 1987-11-11 |
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