CN104190918B - Powder sintering porous filter alloy, preparation method thereof and pre-pressing molding body for preparing powder sintering porous filter alloy - Google Patents
Powder sintering porous filter alloy, preparation method thereof and pre-pressing molding body for preparing powder sintering porous filter alloy Download PDFInfo
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- CN104190918B CN104190918B CN201410438582.1A CN201410438582A CN104190918B CN 104190918 B CN104190918 B CN 104190918B CN 201410438582 A CN201410438582 A CN 201410438582A CN 104190918 B CN104190918 B CN 104190918B
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Abstract
The invention discloses powder sintering porous filter alloy, a preparation method thereof and a pre-pressing molding body for preparing the powder sintering porous filter alloy. The powder sintering porous filter alloy is basically composed of, by mass, 14%-17% of Cr, 6%-10% of Fe, 0%-0.15% of C, 0%-0.5% of Si, 0%-1% of Mn, 0%-0.05% of Cu, 0%-5% of Al, 0%-1.5% of Ti and the balance Ni. The average pore size of the alloy is not larger than 60 micrometers, the relative permeability coefficient of the alloy is not smaller than 80 m<3>/m<2> kpa h. The powder sintering porous filter alloy has good chlorine corrosion resistance and good hydrogen chloride gas corrosion resistance (especially under high temperature), and is especially suitable for gas-solid separation and filtration under a high-temperature chlorine and hydrogen chloride system.
Description
Technical field
The present invention relates to sintered porous filtering material is and in particular to powder sintered porous filtering alloy, the preparation of this alloy
Method and the pre-molding body for preparing this alloy.
Background technology
Applicant concentrates on extension, the material in materials application field at present to the research emphasis of powder sintered porous filter material
Several aspects such as the improvement of material performance, the optimization probed into preparation technology of pore formation mechanism.In the application of sintered porous filtering material
In the extension in field, courageously propose to develop for some specific and relatively harsher applied environments and can correspondingly meet this
Chemical stability (as corrosion resistance) under applied environment requires and has the new material of good strainability.Its meaning is,
If such new material is once succeeded in developing it becomes possible to bring secondary filter technology into corresponding field, thus change this field
Conventional process flow, its result is often the very big improvement of environmental pollution and long-term economic benefit and social benefit
Lifting.But, in the development process of new material, in addition to the research to material composition, usually also can face sintered porousization
Problems in journey, for example: after sintering densification, sintering, the meander factor excessive impact permeance property, material aperture are difficult
With control etc..Therefore, a kind of successful exploitation of new material often can accordingly be related at aspects such as pore formation mechanism, preparation technologies
Innovation.
Content of the invention
The present invention is intended to provide several (refer to the substance system that thing to be filtered is formed, can be liquid for particular filter system
Body system or gas system) show excellent chemical stability and good strainability powder sintered porous filtering alloy,
The preparation method of this alloy and the pre-molding body preparing this alloy.
The first of the present invention powder sintered porous filtering alloy, it is substantially by by mass percentage 26～30%
Mo, 0～2% fe, 0～0.1% cr, 0～0.02% c, 0～0.1% si, 0～1% mn, 0～5% al, 0
～the 1.5% ti and ni of surplus is constituted；When filtering as liquid, its average pore size is not more than 20 μm and infiltration relatively is
Number is not less than 0.2m3/m2Kpa h, is not more than 60 μm as its average pore size during gas filtration and relative permeability is not little
In 80m3/m2·kpa·h.It is to be understood that above-mentioned term " be substantially by ... constituted ", specifically containing in the present invention
Justice refers to: this powder sintered porous filtering alloy can be only made up of these elements above-mentioned；Described unit can also mainly comprised
Add other micro, elements that are will not substantially changing alloy property, such as nb, v, w, y, ta, zr, co etc. on the basis of element.
And the concrete meaning with regard to " relative coefficient of permeability " and " relative permeability " will illustrate in a specific embodiment.
The feature of the first powder sintered porous filtering alloy above-mentioned is: first, this powder sintered porous filtering alloy needle
To complete reduction system, (i.e. non-oxidative ion exists, such as fe3+、cu2+Deng) corrosion resistance is very superior；Secondly, often it is resistant to
Pressure any temperature, the corrosion of any concentration hydrochloric acid；Additionally, the non-oxidizable sulphuric acid, various dense in the intermediate concentration do not inflated
All there is excellent corrosion resisting property in organic acid, bromic acid and the hydrogen chloride gas such as degree phosphoric acid, high temperature acetic acid, formic acid；In addition also resistance to
The corrosion of halogen family catalyst.The first powder sintered porous filtering alloy described is relatively specific for the oil of multiple harshnesses, chemical industry
Process, the distillation of example hydrochloric acid, concentrate；In the production process such as the alkylation of ethylbenzene and low-pressure carbonyl synthesized acetate.
In the first powder sintered porous filtering alloy above-mentioned, cr, c, si, mn, al, ti are optional component.Wherein cr, c,
Si, mn can be added according to the specifically residing filtration system of alloy to put forward heavy alloyed chemical stability.The major significance of al
After being to add, low-alloyed tortuosity can drop to a certain extent.When alloy disclosure satisfy that filtration permeability requirement, can
To be added without al；But in the case of adding al, because in the high-temperature sintering process prepare alloy, al can be changed into liquid phase and enters
And promote the flowing of powder particle, so that the duct that sintering is formed is more round and smooth, low-alloyed tortuosity thus drops.For
Improve the purpose of filtration permeability, the weight/mass percentage composition of described al element is preferably 1～5%, can be more preferably also 3～
5%.In addition, the addition of ti can put forward heavy alloyed high temperature hot strength.When possibility is in the face of high temperature filtration system (such as 300～
800 DEG C of high temperature air filtration) ti element weight/mass percentage composition be preferably 0.2～1%, more preferably 0.5～1%.
The preparation method of the first powder sintered porous filtering alloy above-mentioned, its step includes: 1) by each element powder according to
The ratio of above-mentioned setting is mixed, and wherein ni powder uses the first nikel powder and the second nikel powder, and described first nikel powder is strip, institute
Stating the second nikel powder is spherical or near-spherical, and the ratio of the granularity of described first nikel powder and the second nikel powder is 1:(1.2～5), and by the
The ratio that one nikel powder accounts for the 10～90% of ni powder gross mass adds；2) above-mentioned mixed powder is carried out successively pelletize, drying and pressure
Power molding, baking temperature is set as 40～60 DEG C, is set as 4～8 hours drying time, then carries out pressure forming, pressure
During molding under 120～200mpa briquetting pressure pressurize 20～80 seconds, obtain pre-molding body after pressure forming；3) to being pressed in advance
Type body is sintered, and process includes at least following two stages: defat stage: sintering temperature rises to 350～450 DEG C from room temperature,
And it is incubated 60～300 minutes；The high temperature sintering stage: sintering temperature is risen to 1050～1280 DEG C, and is incubated 60～180 minutes；
Cooling obtains this porous filtering alloy.In said method, when the powder sintered porous filtering alloy as liquid filtration for the preparation,
Stearic acid is then preferably adopted to be granulating agent during pelletize, stearic addition is the 2～8% of mixed powder gross mass；Work as system
The standby powder sintered porous filtering alloy making gas filtration, then preferably adopt carbamide to be granulating agent during pelletize, carbamide plus
Enter amount for the 5～20% of mixed powder gross mass.In addition, described first nikel powder is also excellent further with the ratio of the granularity of the second nikel powder
Elect 1:(2～4 as).Briquetting pressure during pressure forming can be more preferably also 120～150mpa.
Above-mentioned preparation method can be good at avoiding molded body rhegma problem when sintering densification problem and pressure forming,
And material aperture can be control effectively.First, the method is creative will constitute the raw material powder (ni of infrastructure elements ni of alloy
Powder) it has been divided into the first nikel powder and the second nikel powder, the wherein first nikel powder is strip, and the second nikel powder is spherical or near-spherical, first
The ratio of the granularity of nikel powder and the second nikel powder is 1:(1.2～5) (preferably 1:(2～4)), and the first nikel powder accounts for ni powder gross mass
10～90%, so, because the first nikel powder is granularity less strip nikel powder, preferably (molded body is difficult to split to have briquettability
Damage), sinter the less feature of back aperture, and the second nikel powder is the larger spherical or near-spherical nikel powder of granularity, has briquettability relatively
Difference (the easy rhegma of molded body), the larger feature of sintering back aperture, after above-mentioned first nikel powder and the second nikel powder are sufficiently mixed, the
One nikel powder can be filled in the space formed between the second nikel powder, on the one hand plays the effect (root in material aperture after control sintering
Adjust the ratio of the first nikel powder according to the pore diameter range needing, such as 30%, 50%, 70%), on the one hand improve the mixed of mixed powder
Close powder pressing, molded body rhegma probability when reducing pressure forming；In addition, the first nikel powder granularity increases the whole of ni powder compared with I
Body activity, thus reducing sintering temperature, promoting the flowing of crystal grain and growth in Powder during Sintering Process, and preventing to a certain extent
Sintering densification.Secondly, the briquettability for specific blend powder is optimized further by the selection of pressure forming parameter, enters
One step improves the qualification rate of pressure forming.And, according to material composition, sintering temperature rises to 1050 by the high temperature sintering stage～
When 1280 DEG C and the special setting that is incubated 60～180 minutes can ensure to sinter, the generation of a small amount of liquid phase, avoids sintering well
Densification problem.
The obtained pre-molding body for preparing powder sintered porous filtering alloy during enforcement said method,
Constitute ni powder in the powder particle of this pre-molding body and use the first nikel powder and the second nikel powder, described first nikel powder is strip,
Described second nikel powder is spherical or near-spherical, and the ratio of the granularity of described first nikel powder and the second nikel powder is 1:(1.2～5), and the
One nikel powder accounts for the 10～90% of ni powder gross mass.The ratio of the granularity of described first nikel powder and the second nikel powder is more preferably 1:(2
～4).
The second powder sintered porous filtering alloy of the present invention, it is substantially by by mass percentage 14～17%
Cr, 15～17% mo, 0～7% fe, 0～4.5% w, 0～2.5% co, 0～0.08% c, 0～1% si, 0
～1% mn, 0～0.35% v, 0～0.04% p, 0～0.03% s, 0～5% al, 0～1.5% ti and
The ni of surplus is constituted；When filtering as liquid, its average pore size is not more than 20 μm and relative coefficient of permeability is not less than 0.2m3/m2·
Kpa h, is not more than 60 μm as its average pore size during gas filtration and relative permeability is not less than 80m3/m2·kpa·h.
The concrete meaning of above-mentioned term " be substantially by ... constituted " refers to: this powder sintered porous filtering alloy can be only by above-mentioned
These elements are constituted；Can also add on the basis of mainly comprising described element that other are micro, will not substantially change alloy
Element of performance, such as nb, y, ta, zr etc..
The feature of the powder sintered porous filtering alloy of above-mentioned second is: first, this powder sintered porous filtering alloy exists
In oxidisability and reproducibility system, all show superior rotproofness；Secondly, main moisture-proof chlorine, various oxidisability chloride, chlorine
Salt dissolving solution, sulphuric acid and oxidisability salt；Additionally, all having good corrosion resisting property in low temperature with middle thermohaline acid.Therefore, this powder
Sintered porous filtration alloy ratio is relatively suitable for should in the industrial circle such as chemical industry, petrochemical industry, flue gas desulfurization, paper pulp and papermaking, environmental protection
With.
In the powder sintered porous filtering alloy of above-mentioned second, fe, co, w, c, si, mn, v, p, s, al, ti are optional group
Point.Wherein co, c, si, mn, v, p, s can be added according to the specifically residing filtration system of alloy to carry heavy alloyed chemistry surely
Qualitative.The weight/mass percentage composition of w can be more preferably 3～4.5%, so can improve resistance to reduction dielectric corrosion, such as office
Portion's spot corrosion, crevice corrosion；The weight/mass percentage composition of fe can be more preferably 4～7%.The major significance of al can after being to add
Low-alloyed tortuosity drops to a certain extent.When alloy disclosure satisfy that filtration permeability requirement, al can be added without；But
In the case of adding al, because in the high-temperature sintering process prepare alloy, al can be changed into liquid phase and then promote powder particle
Flowing so that sintering formed duct more round and smooth, low-alloyed tortuosity thus drops.For raising filtration permeability
Purpose, the weight/mass percentage composition of described al element is preferably 1～5%, can be more preferably also 3～5%.In addition, ti
Addition can put forward heavy alloyed high temperature hot strength.When possibility is in the face of high temperature filtration system, the weight/mass percentage composition of ti element is preferred
For 0.2～1%, more preferably 0.5～1%.
The preparation method of the powder sintered porous filtering alloy of above-mentioned second, its step includes: 1) by each element powder according to
The ratio of above-mentioned setting is mixed, and wherein ni powder uses the first nikel powder and the second nikel powder, and described first nikel powder is strip, institute
Stating the second nikel powder is spherical or near-spherical, and the ratio of the granularity of described first nikel powder and the second nikel powder is 1:(1.2～5), and by the
The ratio that one nikel powder accounts for the 10～90% of ni powder gross mass adds；2) above-mentioned mixed powder is carried out successively pelletize, drying and pressure
Power molding, baking temperature is set as 40～60 DEG C, is set as 4～8 hours drying time, then carries out pressure forming, pressure
During molding under 120～200mpa briquetting pressure pressurize 20～80 seconds, obtain pre-molding body after pressure forming；3) to being pressed in advance
Type body is sintered, and process includes at least following two stages: defat stage: sintering temperature rises to 350～450 DEG C from room temperature,
And it is incubated 60～300 minutes；The high temperature sintering stage: sintering temperature is risen to 1150～1280 DEG C, and is incubated 60～180 minutes；
Cooling obtains this porous filtering alloy.In said method, when the powder sintered porous filtering alloy as liquid filtration for the preparation,
Stearic acid is then preferably adopted to be granulating agent during pelletize, stearic addition is the 2～8% of mixed powder gross mass；Work as system
The standby powder sintered porous filtering alloy making gas filtration, then preferably adopt carbamide to be granulating agent during pelletize, carbamide plus
Enter amount for the 5～20% of mixed powder gross mass.In addition, described first nikel powder is also excellent further with the ratio of the granularity of the second nikel powder
Elect 1:(2～4 as).Briquetting pressure during pressure forming can be more preferably 120～150mpa.
Above-mentioned preparation method can be good at avoiding molded body rhegma problem when sintering densification and pressure forming, and can
Material aperture is control effectively.First, the method is creative will constitute the raw material powder (ni powder) of infrastructure elements ni of alloy
The first nikel powder and the second nikel powder have been divided into it, the first nikel powder is strip, the second nikel powder is spherical or near-spherical, the first nikel powder and the
The ratio of the granularity of two nikel powders is 1:(1.2～5), and the first nikel powder accounts for the 10～90% of ni powder gross mass, so, due to the first nickel
Powder is granularity less strip nikel powder, has briquettability preferably, sinters the less feature of back aperture, and the second nikel powder is granularity
Larger spherical or near-spherical nikel powder, has that briquettability is poor, the larger feature of sintering back aperture, by above-mentioned first nikel powder and the
After two nikel powders are sufficiently mixed, the first nikel powder can be filled in the space formed between the second nikel powder, on the one hand plays control sintering
The effect (ratio of aperture adjustment first nikel powder as needed, such as 30%, 50%, 70%) in material aperture afterwards, on the one hand
Improve the mixed powder briquettability of mixed powder, molded body rhegma probability when reducing pressure forming, in addition, the first nikel powder granularity is relatively
I increases the overall activity of ni powder, thus reducing sintering temperature, promotes the flowing of crystal grain and growth in Powder during Sintering Process, and
Prevent sintering densification to a certain extent.Secondly, optimized further for specific mixed by the selection of pressure forming parameter
Close the briquettability of powder, further improve the qualification rate of pressure forming.And, according to material composition, the high temperature sintering stage will
Sintering temperature rises to 1150～1280 DEG C and is incubated the special setting of 60～180 minutes, avoids sintering densification well and asks
Topic.
The obtained pre-molding body for preparing powder sintered porous filtering alloy during enforcement said method,
Constitute ni powder in the powder particle of this pre-molding body and use the first nikel powder and the second nikel powder, described first nikel powder is strip,
Described second nikel powder is spherical or near-spherical, and the ratio of the granularity of described first nikel powder and the second nikel powder is 1:(1.2～5), and the
One nikel powder accounts for the 10～90% of ni powder gross mass.The ratio of the granularity of described first nikel powder and the second nikel powder further be 1:(2～
4).
The third powder sintered porous filtering alloy that the present invention provides, substantially by by mass percentage 21～23.5%
Cr, 6～8% mo, 18～21% fe, 0～1.5% w, 0～2.5% co, 0～0.05% c, 0～1%
Si, 0～2.5% mn, 0～2.5% ta or/and nb, the ni of 0～5% al, 0～1.5% ti and surplus are constituted；
When filtering as liquid, its average pore size is not more than 20 μm and relative coefficient of permeability is not less than 0.2m3/m2Kpa h, as gas
When body filters, its average pore size is not more than 60 μm and relative permeability is not less than 80m3/m2·kpa·h.Above-mentioned term is " basic
Be by ... constituted " concrete meaning refer to: this powder sintered porous filtering alloy can be only made up of these elements above-mentioned；
Certainly this powder sintered porous filtering alloy can also add on the basis of mainly comprising described element that other are micro, will not
Substantially change the element of alloy property, such as v, y, zr etc..
The feature of the third powder sintered porous filtering alloy above-mentioned is: this powder sintered porous filtering alloy needle is to strong oxygen
Changing gonosome cording has splendid resistance；Especially resistance to phosphoric acid, sulphuric acid, sulfate etc..
In the third powder sintered porous filtering alloy above-mentioned, w, co, c, si, mn, ta, nb, al, ti are optional component.
Wherein w, co, c, si, mn, ta, nb can be added according to the specifically residing filtration system of alloy to carry heavy alloyed chemistry surely
Qualitative.The weight/mass percentage composition of mn can be more preferably 1.5～2.5%, and the red brittleness of material so can be obviously reduced；ta
Or/and the weight/mass percentage composition of nb can be more preferably 1～2%, material opposing local corrosion so can be significantly improved
Effect, simultaneously improve material heat stability.The major significance of al can drop low-alloyed to a certain extent after being to add
Tortuosity.When alloy disclosure satisfy that filtration permeability requirement, al can be added without；But in the case of adding al, due to
In the high-temperature sintering process prepare alloy, al can be changed into liquid phase and then promote the flowing of powder particle, so that sintering is formed
Duct more round and smooth, low-alloyed tortuosity thus drops.For the purpose improving filtration permeability, the matter of described al element
Amount percentage composition is preferably 1～5%, can be more preferably also 3～5%.In addition, the addition of ti can carry heavy alloyed high temperature
Calorific intensity.When possibility is in the face of high temperature filtration system, the weight/mass percentage composition of ti element is preferably 0.2～1%, further preferably
For 0.5～1%.
The preparation method of the third powder sintered porous filtering alloy above-mentioned, its step includes: 1) by each element powder according to
The ratio of above-mentioned setting is mixed, and wherein ni powder uses the first nikel powder and the second nikel powder, and described first nikel powder is strip, institute
Stating the second nikel powder is spherical or near-spherical, and the ratio of the granularity of described first nikel powder and the second nikel powder is 1:(1.2～5), and by the
The ratio that one nikel powder accounts for the 10～90% of ni powder gross mass adds；2) above-mentioned mixed powder is carried out successively pelletize, drying and pressure
Power molding, baking temperature is set as 40～60 DEG C, is set as 4～8 hours drying time, then carries out pressure forming, pressure
During molding under 120～200mpa briquetting pressure pressurize 20～80 seconds, obtain pre-molding body after pressure forming；3) to being pressed in advance
Type body is sintered, and process includes at least following two stages: defat stage: sintering temperature rises to 350～450 DEG C from room temperature,
And it is incubated 60～300 minutes；The high temperature sintering stage: sintering temperature is risen to 1150～1310 DEG C, and is incubated 60～180 minutes；
Cooling obtains this porous filtering alloy.In said method, when the powder sintered porous filtering alloy as liquid filtration for the preparation,
Stearic acid is then preferably adopted to be granulating agent during pelletize, stearic addition is the 2～8% of mixed powder gross mass；Work as system
The standby powder sintered porous filtering alloy making gas filtration, then preferably adopt carbamide to be granulating agent during pelletize, carbamide plus
Enter amount for the 5～20% of mixed powder gross mass.In addition, described first nikel powder is also excellent further with the ratio of the granularity of the second nikel powder
Elect 1:(2～4 as).Briquetting pressure during pressure forming can be more preferably 120～150mpa.
Above-mentioned preparation method can be good at avoiding molded body rhegma problem when sintering densification and pressure forming, and can
Material aperture is control effectively.First, the method is creative will constitute the raw material powder (ni powder) of infrastructure elements ni of alloy
The first nikel powder and the second nikel powder have been divided into it, the first nikel powder is strip, the second nikel powder is spherical or near-spherical, the first nikel powder and the
The ratio of the granularity of two nikel powders is 1:(1.2～5), and the first nikel powder accounts for the 10～90% of ni powder gross mass, so, due to the first nickel
Powder is granularity less strip nikel powder, has briquettability preferably, sinters the less feature of back aperture, and the second nikel powder is granularity
Larger spherical or near-spherical nikel powder, has that briquettability is poor, the larger feature of sintering back aperture, by above-mentioned first nikel powder and the
After two nikel powders are sufficiently mixed, the first nikel powder can be filled in the space formed between the second nikel powder, on the one hand plays control sintering
The effect (ratio of aperture adjustment first nikel powder as needed, such as 30%, 50%, 70%) in material aperture afterwards, on the one hand
Improve the mixed powder briquettability of mixed powder, molded body rhegma probability when reducing pressure forming, in addition, the first nikel powder granularity is relatively
I increases the overall activity of ni powder, thus reducing sintering temperature, promotes the flowing of crystal grain and growth in Powder during Sintering Process, and
Prevent sintering densification to a certain extent.Secondly, optimized further for specific mixed by the selection of pressure forming parameter
Close the briquettability of powder, further improve the qualification rate of pressure forming.And, according to material composition, the high temperature sintering stage will
Sintering temperature rises to 1150～1310 DEG C and is incubated the special setting of 60～180 minutes, avoids sintering densification well and asks
Topic.
During enforcement said method, the obtained pre-molding body for preparing porous filtering alloy, constitutes this pre-
In the powder particle of molded body, ni powder uses the first nikel powder and the second nikel powder, and described first nikel powder is strip, and described second
Nikel powder is spherical or near-spherical, and the ratio of the granularity of described first nikel powder and the second nikel powder is 1:(1.2～5), and the first nikel powder accounts for
The 10～90% of ni powder gross mass.The ratio of the granularity of described first nikel powder and the second nikel powder is 1:(2～4 further).
The 4th kind of powder sintered porous filtering alloy of the present invention, it is substantially by by mass percentage 14～17%
Cr, 6～10% fe, 0～0.15% c, 0～0.5% si, 0～1% mn, 0～0.05% cu, 0～5% al,
The ni of 0～1.5% ti and surplus is constituted, and its average pore size is not more than 60 μm and relative permeability is not less than 80m3/
m2·kpa·h.It is to be understood that above-mentioned term " be substantially by ... constituted ", concrete meaning refers to: this is powder sintered
Porous filtering alloy can be only made up of these elements above-mentioned；Can also be added other on the basis of mainly comprising described element
Micro, element that is will not substantially changing alloy property, such as nb, v, w, y, ta, zr, co etc..
Above-mentioned 4th kind of powder sintered porous filtering alloy has good resistance to chlorine, the characteristic of hydrogen chloride gas corrosion
(particularly under the high temperature conditions), is particularly suited for high temperature chlorine, the gas solid separation under chlorination hydrogen system filters.
In above-mentioned 4th kind of powder sintered porous filtering alloy, c, si, mn, cu, al, ti are optional component.Wherein cr, c,
Si, mn, cu can be added according to the specifically residing filtration system of alloy to put forward heavy alloyed chemical stability.The main meaning of al
Justice can drop low-alloyed tortuosity after being to add to a certain extent.When alloy disclosure satisfy that filtration permeability requirement,
Al can be added without；But in the case of adding al, because in the high-temperature sintering process prepare alloy, al can be changed into liquid phase
And then the flowing of promotion powder particle, so that the duct that sintering is formed is more round and smooth, low-alloyed tortuosity thus drops.Go out
In the purpose improving filtration permeability, the weight/mass percentage composition of described al element is preferably 1～5%, can be more preferably also 3
～5%.In addition, the addition of ti can put forward heavy alloyed high temperature hot strength.When possibility is in the face of high temperature filtration system (such as 300
～800 DEG C of high temperature air filtration) ti element weight/mass percentage composition be preferably 0.2～1%, more preferably 0.5～
1%.
The preparation method of above-mentioned 4th kind of powder sintered porous filtering alloy, its step includes: 1) by each element powder according to
The ratio of above-mentioned setting is mixed, and wherein ni powder uses the first nikel powder and the second nikel powder, and described first nikel powder is strip, institute
Stating the second nikel powder is spherical or near-spherical, and the ratio of the granularity of described first nikel powder and the second nikel powder is 1:(1.2～5), and by the
The ratio that one nikel powder accounts for the 10～90% of ni powder gross mass adds；2) above-mentioned mixed powder is carried out successively pelletize, drying and pressure
Power molding, baking temperature is set as 40～60 DEG C, is set as 4～8 hours drying time, then carries out pressure forming, pressure
During molding under 120～220mpa briquetting pressure pressurize 20～80 seconds, obtain pre-molding body after pressure forming；3) to being pressed in advance
Type body is sintered, and process includes at least following two stages: defat stage: sintering temperature rises to 350～450 DEG C from room temperature,
And it is incubated 60～300 minutes；The high temperature sintering stage: sintering temperature is risen to 1200～1320 DEG C, and is incubated 120～300 minutes；
Cooling obtains this porous filtering alloy.In said method, carbamide is preferably adopted to be granulating agent during pelletize, the addition of carbamide
For mixed powder gross mass 5～20%.In addition, described first nikel powder with the ratio of the granularity of the second nikel powder is still further preferably
1:(2～4).Briquetting pressure during pressure forming can be more preferably also 150～200mpa.
Above-mentioned preparation method can be good at avoiding molded body rhegma problem during pressure forming, and material aperture can be entered
Row effective control.First, the method is creative has been divided into the first nickel by the raw material powder (ni powder) constituting infrastructure elements ni of alloy
Powder and the second nikel powder, the wherein first nikel powder is strip, and the second nikel powder is spherical or near-spherical, the first nikel powder and the second nikel powder
The ratio of granularity is 1:(1.2～5) (preferably 1:(2～4)), and the first nikel powder accounts for the 10～90% of ni powder gross mass, so, by
It is granularity less strip nikel powder in the first nikel powder, there is briquettability preferably (molded body is difficult rhegma), sintering back aperture is relatively
Little feature, and the second nikel powder is the larger spherical or near-spherical nikel powder of granularity, having briquettability, poor (molded body easily splits
Damage), the larger feature of sintering back aperture, after above-mentioned first nikel powder and the second nikel powder are sufficiently mixed, the first nikel powder can be filled in
In the space being formed between second nikel powder, on the one hand play effect (the aperture model as needed in material aperture after control sintering
Enclose adjustment the first nikel powder ratio, such as 30%, 50%, 70%), on the one hand improve the mixed powder briquettability of mixed powder,
Molded body rhegma probability when reducing pressure forming；In addition, the first nikel powder granularity increases the overall activity of ni powder compared with I, thus dropping
Sintering temperature and low, promotes the flowing of crystal grain and growth in Powder during Sintering Process, and prevents sintering densification to a certain extent.Separately
Outward, the briquettability for specific blend powder is optimized further by the selection of pressure forming parameter, further improve pressure
The qualification rate of power molding.
The obtained pre-molding body for preparing powder sintered porous filtering alloy during enforcement said method,
Constitute ni powder in the powder particle of this pre-molding body and use the first nikel powder and the second nikel powder, described first nikel powder is strip,
Described second nikel powder is spherical or near-spherical, and the ratio of the granularity of described first nikel powder and the second nikel powder is 1:(1.2～5), and the
One nikel powder accounts for the 10～90% of ni powder gross mass.The ratio of the granularity of described first nikel powder and the second nikel powder is more preferably 1:(2
～4).It can be more preferably also 15～50% that first nikel powder accounts for ni powder gross mass.
In sum, above, mainly having in common that of four kinds of powder sintered porous filtering alloys is ni based alloy, and
In preparation technology, all the raw material powder (ni powder) for infrastructure elements ni constituting this alloy takes special technological means.Shen
Ask someone during exploitation above-mentioned first three powder sintered porous filtering alloy, the conventional powder metallurgic method preparation of discovery is burnt
The technique of knot porous material haves such problems as that sintering densification, infiltration rate be low, tortuosity is larger, thus far cannot reach
It is not more than 20 μm to its average pore size when filtering as liquid and relative coefficient of permeability is not less than 0.2m3/m2Kpa h, is used as
During gas filtration, its average pore size is not more than 60 μm and relative permeability is not less than 80m3/m2The technical requirements of kpa h.Logical
Cross above-mentioned series of measures, the powder sintered porous filtering alloy obtained by making can either show excellent for particular filter system
Different chemical stability, has reached good strainability simultaneously again.Developing above-mentioned 4th kind of powder sintered porous filtering alloy
During, sintering densification problem does not project, but finds low qualified during pressure forming, and pre-compaction forming body easily splits
Damage, after taking the treatment measures to ni powder, pre-compaction forming body qualification rate can greatly improve.
In addition, also can summarize further by the above showing that one kind being capable of the simple powder sintered porous body of effective control
Aperture size, and the preparation method of powder sintered porous body of molded body rhegma probability and system when can reduce pressure forming
The pre-molding body of this sintered body standby.I.e. the preparation method of this powder sintered porous body is: step includes dispensing, molding and burning
Knot, is directed to the basic material powder preparing this porous body using shape, the first powder body of different sizes and the second powder body, institute during dispensing
State the first powder body compare that the second powder granularity is less and briquettability during molding more preferably, and the first powder body accounts for this basic material powder
The 10～90% of gross mass.If porous body is ni based alloy, the first powder body is the first nikel powder, and the second powder body is the second nikel powder.
Because the first powder body has briquettability preferably, the sintering less feature of back aperture (because the first powder granularity is less), and the second powder
Body has the characteristics that to sinter back aperture larger (because the second powder granularity is larger), will be fully mixed with the second powder body for above-mentioned first powder body
After conjunction, the first powder body can be filled in the space formed between the second powder body, on the one hand plays material aperture after control sinters
Effect (ratio of aperture adjustment first powder body as needed, such as 30%, 50%, 70%), on the one hand improves mixed powder
Briquettability, molded body rhegma probability when reducing pressure forming, in addition, the first powder granularity increases basic material powder compared with I
Overall activity, thus reducing sintering temperature, promoting the flowing of crystal grain and growth in Powder during Sintering Process, and preventing to a certain extent
Only sintering densification.
One of preparation method of this powder sintered porous body preferably concrete mode is: described first powder body is strip
Shape, described second powder body is spherical or near-spherical, and the ratio of the granularity of described first powder body and the second powder body is 1:(1.2～5).Its
Briquettability more preferable feature when first powder body of middle strip has molding, and the accumulation of the second powder body of spherical or near-spherical
Space is larger, and sintering porosity is higher；The ratio of the granularity of the first powder body and the second powder body is set as 1:(1.2～5), can be more preferable
Guarantee the briquettability of mixed powder and the accuracy of pore size control.The ratio of the granularity of the wherein first powder body and the second powder body enters one
Step is preferably 1:(2～4).Additionally, the first powder body can adopt electrolytic powder (shape of electrolytic powder is strip), the second powder body can
Using atomized powder (shape of atomized powder is spherical or near-spherical).Certainly, the first powder body of strip not can only be using electricity
Solution mode obtains, and also can obtain the first powder body of strip by other Preparation Technique of Powders (as oxidation-reduction method)；Spherical
Or the second powder body of near-spherical not can only be obtained using atomizing type, also can be obtained by Preparation Technique of Powders known to other
Second powder body.
The obtained pre-molding body for preparing powder sintered porous body during enforcement said method, constituting should
Basic material powder in the powder particle of pre-molding body uses shape, the first powder body of different sizes and the second powder body, described
First powder body compare that the second powder granularity is less and briquettability during molding more preferably, and the first powder body to account for this basic material powder total
The 10～90% of quality.Wherein, it is further that described first powder body is strip, described second powder body is spherical or class ball
Shape, the ratio of the granularity of described first powder body and the second powder body is 1:(1.2～5).
With reference to specific embodiment, the present invention will be further described.Aspect that the present invention adds and advantage will under
Give out in the middle part of the description in face, partly will become apparent from the description below, or recognized by the practice of the present invention.
Specific embodiment
Preparation side below by the above-mentioned several powder sintered ni base porous filtering alloy to the present invention for four groups of experimental examples
Method and the powder sintered ni base porous filtering alloy being obtained by these methods are specifically described.By these explanations, this area
Technical staff can clearly recognize the outstanding feature that the powder sintered ni base porous filtering alloy of the present invention has.Hereinafter relate to
And the numbering of experimental example consistent with the numbering of corresponding " sample ".
<battery of tests>
The material composition of the experimental example 1 to 12 of first group of test example and content (by percentage to the quality) are shown in Table 1.Wherein,
The powder sintered porous filtering alloy that material applications a refer to prepare is used as liquid and filters；Material applications b refer to the powder sintered many of preparation
Hole is filtered alloy and is used as gas filtration.In the experimental example 1 to 12 of battery of tests, it is real that each experimental example also includes 5 identicals
Example.
The material composition of experimental example 1 to 12 and content in 1 first group of test example of table
Note: in table, "×" represents no this item.
In above-mentioned experimental example 1 to 12, ni powder all employs the first nikel powder and the second nikel powder.Wherein, described first nikel powder choosing
Select the electrolytic nickel powder of strip, granularity is 10～25 μm；Described second nikel powder is chosen as spherical or near-spherical atomization nikel powder, grain
Spend for 35～45 μm.The particle diameter of remaining the raw material powder in addition to ni powder is -400 mesh.Above-mentioned particle diameter is standby powder sintered according to drawing up
The design aperture of ni base porous filtering alloy and pore-size distribution determining, those skilled in the art can according to aperture situation will
Ask and be adjusted.In addition, in test example 1-4, the first nikel powder accounts for the 35% of ni powder gross mass, in test example 5-7,9-11
One nikel powder accounts for the 55% of ni powder gross mass, and in test example 8,12, the first nikel powder accounts for the 20% of ni powder gross mass.
As listed by table 1, respectively the raw material of experimental example 1 to 12 is mixed.After being sufficiently mixed, then to experimental example 1 to 12
Powder carry out pelletize, be dried again after pelletize, baking temperature is set as 55 DEG C, be set as 6 hours drying time.Test example
Stearic acid is adopted to be granulating agent in 1-7,9-11 during pelletize, stearic addition is the 5% of mixed powder gross mass.Herein
From stearic effect and advantage it is: 1) i.e. agglomerated powder granules, prevent component segregation, secondly, there is certain lubrication work
With i.e. compacting easy-formation and the easy demoulding；2) stearic acid easily decomposes, and 360-370 DEG C is decomposed completely, and catabolite be co2, co,
H2o etc., easily overflows noresidue, adopts carbamide to be granulating agent in the reactionless test example 8,12 with matrix material during pelletize, carbamide
Addition is the 12% of mixed powder gross mass.Effect and advantage from carbamide herein is: 1) as foaming agent, improves material
Porosity；2) decomposition temperature low (160 DEG C), and catabolite are ammonia and cyanic acid, can leave hole position after sending out, and formation is opened
Hole.
Afterwards, respectively the powder of experimental example 1 to 12 is loaded in the isostatic pressing mold of unified specification, then by these
Mould is respectively placed in cold isostatic compaction machine, pressurize 60 seconds under 150mpa briquetting pressure, and making numbering after the demoulding is 1 to 12
Tubulose pre-molding body.Above-mentioned isostatic pressing the results are shown in Table 2.From Table 2, it can be seen that the only example 3 of experimental example 12
Pre-molding body find rhegma, remaining pre-molding body all no rhegmas, isostatic pressing qualification rate is significantly better than existing situation.
Table 2 isostatic pressing qualification rate
| Experimental example is numbered | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| 1 | √ | √ | √ | √ | √ |
| 2 | √ | √ | √ | √ | √ |
| 3 | √ | √ | √ | √ | √ |
| 4 | √ | √ | √ | √ | √ |
| 5 | √ | √ | √ | √ | √ |
| 6 | √ | √ | √ | √ | √ |
| 7 | √ | √ | √ | √ | √ |
| 8 | √ | √ | √ | √ | √ |
| 9 | √ | √ | √ | √ | √ |
| 10 | √ | √ | √ | √ | √ |
| 11 | √ | √ | √ | √ | √ |
| 12 | √ | √ | × | √ | √ |
Note: in table, "×" represents that pre-molding body has rhegma, unqualified；In table, " √ " represents pre-molding body no rhegma,
Qualified.
Then, choose in experimental example 1 to 12 the pre-molding body of one of example respectively and load sintering boat, then this
A little sintering boats are placed in sintering furnace and are sintered, furnace cooling after sintering, finally obtain sample 1 to 12 again from each sintering boat.
The sintering schedule of experimental example 1 to 12 all comprises following two stages.First stage is the defat stage: sintering temperature rises to from room temperature
400 DEG C, and it is incubated 180 minutes；Second stage is the high temperature sintering stage: sintering temperature is risen to 1150 DEG C, and is incubated 120 points
Clock；Cooling obtains this porous filtering alloy.
The strainability test such as table 3 of sample 1 to 12.Wherein, the mensure of material porosity and average pore size adopts bubble
Method；Relative coefficient of permeability is specially in every square metre of filter area, and in every kpa (kPa) filtration pressure difference and per hour lower water is logical
Amount；Relative permeability is specially in every square metre of filter area, in every kpa (kPa) filtration pressure difference and per hour under air
Flux；The test of Tensile strength is to be processed as after standard specimen leading to by CNS gb7963-87 by sample 1 to 12
Overstretching machine records.
Table 3 result of the test
Note: in table, "×" represents no this item.
The chemical stability test such as table 3 of sample 1 to 12.Wherein, erosion test 1 be 10% in mass fraction salt
In acid solution, weight-loss ratio (%) after 60 days for the soaking at room temperature is characterizing；Erosion test 2 be 80% in mass fraction hydrochloric acid
In solution, weight-loss ratio (%) after 60 days for the soaking at room temperature is characterizing；Erosion test 3 is molten with the phosphoric acid being 60% in mass fraction
In liquid, weight-loss ratio (%) after 60 days for the soaking at room temperature is characterizing；Erosion test 4 be 60% in mass fraction sulfuric acid solution
Weight-loss ratio (%) after 60 days for the middle soaking at room temperature is characterizing；Erosion test 5 be 60% in mass fraction formic acid solution in
Weight-loss ratio (%) after 60 days for the soaking at room temperature is characterizing；Erosion test 5 with hydrogen chloride gas using the weightlessness after 60 days
Rate (%) is characterizing.
Table 4 result of the test
Note: in table, "×" represents no this item.
<second group of test>
The material composition of experimental example 1 to 12 of second group of test and content (by percentage to the quality) are shown in Table 5.Wherein, material
The powder sintered porous filtering alloy that material purposes a refers to prepare is used as liquid and filters；Material applications b refer to the powder sintered porous prepared
Filter alloy and be used as gas filtration.In the experimental example 1 to 12 of second group of test, each experimental example only has an example.
The material composition of experimental example 1 to 12 and content in 5 second groups of test examples of table
Note: in table, "×" represents no this item.
In above-mentioned experimental example 1 to 12, ni powder all employs the first nikel powder and the second nikel powder.Wherein, described first nikel powder choosing
Select the electrolytic nickel powder of strip, 10～25 μm of granularity；Described second nikel powder is chosen as spherical or near-spherical atomization nikel powder, granularity
35～45 μm.The particle diameter of remaining the raw material powder outside ni powder is -400 mesh.Equally, above-mentioned particle diameter is according to the standby powder sintered ni that draws up
Determining, those skilled in the art can be according to the requirement of aperture situation for the design aperture of base porous filtering alloy and pore-size distribution
It is adjusted.In addition, in test example 1-4, the first nikel powder accounts for the 35% of ni powder gross mass, and in test example 5-11, the first nikel powder accounts for
The 55% of ni powder gross mass, in test example 12, the first nikel powder accounts for the 20% of ni powder gross mass.
As listed by table 5, respectively the raw material of experimental example 1 to 12 is mixed.After being sufficiently mixed, then to experimental example 1 to 12
Powder carry out pelletize, be dried again after pelletize, baking temperature is set as 55 DEG C, be set as 6 hours drying time.Test example
Stearic acid is adopted to be granulating agent in 1-11 during pelletize, stearic addition is the 5% of mixed powder gross mass.Test example 12
Carbamide is adopted to be granulating agent during middle pelletize, the addition of carbamide is the 12% of mixed powder gross mass.
Afterwards, respectively the powder of experimental example 1 to 12 is loaded in the isostatic pressing mold of unified specification, then by these
Mould is respectively placed in cold isostatic compaction machine, pressurize 60 seconds under 150mpa briquetting pressure, and making numbering after the demoulding is 1 to 12
Tubulose pre-molding body.These pre-molding bodies all no rhegmas.
Then, respectively by the pre-molding body in experimental example 1 to 12 and load sintering boat, then these sintering boats are placed in burning
It is sintered in freezing of a furnace, furnace cooling after sintering, finally obtain sample 1 to 12 again from each sintering boat.The burning of experimental example 1 to 12
Knot system all comprises following two stages.First stage is the defat stage: sintering temperature rises to 400 DEG C from room temperature, and is incubated 180
Minute；Second stage is the high temperature sintering stage: sintering temperature is risen to 1200 DEG C, and is incubated 120 minutes；Obtain respectively after cooling
To sample 1 to 12.
The strainability test such as table 6 of sample 1 to 12.Wherein, the mensure of material porosity and average pore size adopts bubble
Method；Relative coefficient of permeability is specially in every square metre of filter area, and in every kpa (kPa) filtration pressure difference and per hour lower water is logical
Amount；Relative permeability is specially in every square metre of filter area, in every kpa (kPa) filtration pressure difference and per hour under air
Flux；The test of Tensile strength is to be processed as after standard specimen leading to by CNS gb7963-87 by sample 1 to 12
Overstretching machine records.
Table 6 result of the test
Note: in table, "×" represents no this item.
The chemical stability test such as table 7 of sample 1 to 12.Wherein, erosion test 1 be 10% in mass fraction salt
In acid solution, weight-loss ratio (%) after 60 days for the soaking at room temperature is characterizing；Erosion test 2 be 10% in mass fraction sulphuric acid
In solution, weight-loss ratio (%) after 60 days for the soaking at room temperature is characterizing；Erosion test 3 be 10% in mass fraction sodium chloride
In solution, weight-loss ratio (%) after 60 days for the soaking at room temperature is characterizing；Erosion test 4 be 10% in mass fraction iron chloride
In solution, weight-loss ratio (%) after 60 days for the soaking at room temperature is characterizing；Erosion test 5 with moist chlorine using the mistake after 60 days
Rate (%) is characterizing again.
Table 7 result of the test
Note: in table, "×" represents no this item.
<the 3rd group of test>
The material composition of experimental example 1 to 9 of the 3rd group of test and content (by percentage to the quality) are shown in Table 8.Wherein, material
The powder sintered porous filtering alloy that purposes a refers to prepare is used as liquid and filters；Material applications b refer to the powder sintered porous mistake prepared
Filter alloy is used as gas filtration.In the experimental example 1 to 9 of battery of tests, each experimental example only has an example.
The material composition of experimental example 1 to 9 and content in the 3rd group of test example of table 8
Note: in table, "×" represents no this item.
In above-mentioned experimental example 1 to 9, ni powder all employs the first nikel powder and the second nikel powder.Wherein, described first nikel powder selects
The electrolytic nickel powder of strip, 10～25 μm of granularity；Described second nikel powder is chosen as spherical or near-spherical atomization nikel powder, granularity 35
～45 μm.The particle diameter of remaining the raw material powder outside ni powder is -400 mesh.In above-mentioned test example 1-8, the first nikel powder accounts for ni powder gross mass
55%, in test example 9, the first nikel powder accounts for the 20% of ni powder gross mass.
As listed by table 8, respectively the raw material of experimental example 1 to 9 is mixed.After being sufficiently mixed, then to experimental example 1 to 9
Powder carries out pelletize, is dried after pelletize again, and baking temperature is set as 55 DEG C, is set as 6 hours drying time.Test example
Stearic acid is adopted to be granulating agent in 1-8 during pelletize, stearic addition is the 5% of mixed powder gross mass.In test example 9
Carbamide is adopted to be granulating agent during pelletize, the addition of carbamide is the 12% of mixed powder gross mass.
Afterwards, respectively the powder of experimental example 1 to 9 is loaded in the isostatic pressing mold of unified specification, then by these
Mould is respectively placed in cold isostatic compaction machine, pressurize 60 seconds under 150mpa briquetting pressure, and making numbering after the demoulding is 1 to 9
Tubulose pre-molding body.These pre-molding bodies all no rhegmas.
Then, by the pre-molding body of experimental example 1 to 9 and load sintering boat, then these sintering boats are placed in sintering furnace
It is sintered, furnace cooling after sintering, finally obtain sample 1 to 9 again from each sintering boat.The sintering schedule of experimental example 1 to 9 is equal
Comprise following two stages.First stage is the defat stage: sintering temperature rises to 400 DEG C from room temperature, and is incubated 180 minutes；The
Two-stage is the high temperature sintering stage: sintering temperature is risen to 1200 DEG C, and is incubated 120 minutes；Sample 1 is respectively obtained after cooling
To 9.
The strainability test such as table 9 of sample 1 to 9.Wherein, the mensure of material porosity and average pore size adopts bubble
Method；Relative coefficient of permeability is specially in every square metre of filter area, and in every kpa (kPa) filtration pressure difference and per hour lower water is logical
Amount；Relative permeability is specially in every square metre of filter area, in every kpa (kPa) filtration pressure difference and per hour under air
Flux；The test of Tensile strength is to be processed as after standard specimen leading to by CNS gb7963-87 by sample 1 to 9
Overstretching machine records.
Table 9 result of the test
Note: in table, "×" represents no this item.
The chemical stability test such as table 10 of sample 1 to 9.Wherein, erosion test 1 be 10% in mass fraction phosphorus
In acid solution, weight-loss ratio (%) after 60 days for the soaking at room temperature is characterizing；Erosion test 2 be 30% in mass fraction phosphoric acid
In solution, weight-loss ratio (%) after 60 days for the soaking at room temperature is characterizing；Erosion test 3 is molten with the sulphuric acid being 10% in mass fraction
In liquid, weight-loss ratio (%) after 60 days for the soaking at room temperature is characterizing；Erosion test 4 be 30% in mass fraction sulfuric acid solution
Weight-loss ratio (%) after 60 days for the middle soaking at room temperature is characterizing；Erosion test 5 with dry chlorine gas using the weightlessness after 60 days
Rate (%) is characterizing.
Table 10 result of the test
Note: in table, "×" represents no this item.
<the 4th group of experimental example>
The material composition of experimental example 1 to 8 of the 4th group of test and content (by percentage to the quality) are shown in Table 11.Wherein, material
The powder sintered porous filtering alloy that material purposes b refers to prepare is used as gas filtration.In the experimental example 1 to 8 of battery of tests, each
Experimental example only has an example.
The material composition of experimental example 1 to 8 and content in the 4th group of test example of table 11
Note: in table, "×" represents no this item.
In above-mentioned experimental example 1 to 8, ni powder all employs the first nikel powder and the second nikel powder.Wherein, described first nikel powder selects
The electrolytic nickel powder of strip, 10～25 μm of granularity；Described second nikel powder is chosen as spherical or near-spherical atomization nikel powder, granularity 35
～45 μm.The particle diameter of remaining the raw material powder outside ni powder is -400 mesh.In above-mentioned test example 1-8, the first nikel powder accounts for ni powder gross mass
20%.
As listed by table 11, respectively the raw material of experimental example 1 to 8 is mixed.After being sufficiently mixed, then to experimental example 1 to 8
Powder carries out pelletize, is dried after pelletize again, and baking temperature is set as 55 DEG C, is set as 6 hours drying time.Test example
Carbamide is adopted to be granulating agent in 1-8 during pelletize, the addition of carbamide is the 12% of mixed powder gross mass.
Afterwards, respectively the powder of experimental example 1 to 8 is loaded in the isostatic pressing mold of unified specification, then by these
Mould is respectively placed in cold isostatic compaction machine, pressurize 60 seconds under 180mpa briquetting pressure, and making numbering after the demoulding is 1 to 8
Tubulose pre-molding body.These pre-molding bodies all no rhegmas.
Then, by the pre-molding body of experimental example 1 to 8 and load sintering boat, then these sintering boats are placed in sintering furnace
It is sintered, furnace cooling after sintering, finally obtain sample 1 to 8 again from each sintering boat.The sintering schedule of experimental example 1 to 8 is equal
Comprise following two stages.First stage is the defat stage: sintering temperature rises to 400 DEG C from room temperature, and is incubated 180 minutes；The
Two-stage is the high temperature sintering stage: sintering temperature is risen to 1300 DEG C, and is incubated 200 minutes；Sample 1 is respectively obtained after cooling
To 8.
The strainability test such as table 12 of sample 1 to 8.Wherein, the mensure of material porosity and average pore size adopts bubble
Method；Relative coefficient of permeability is specially in every square metre of filter area, and in every kpa (kPa) filtration pressure difference and per hour lower water is logical
Amount；Relative permeability is specially in every square metre of filter area, in every kpa (kPa) filtration pressure difference and per hour under air
Flux；The test of Tensile strength is to be processed as after standard specimen leading to by CNS gb7963-87 by sample 1 to 8
Overstretching machine records.
Table 12 result of the test
Note: in table, "×" represents no this item.
The chemical stability test such as table 10 of sample 1 to 8.Wherein, erosion test 1 is to make under 400 DEG C of dry chlorine gas
To be characterized with the weight-loss ratio (%) after 30 days.
Table 13 result of the test
Note: in table, "×" represents no this item.
Claims (9)
1. the preparation method of powder sintered porous filtering alloy, described powder sintered porous filtering alloy is substantially by by quality hundred
Point than the cr of meter 14～17%, 6～10% fe, 0～0.15% c, 0～0.5% si, 0～1% mn, 0～0.05%
Cu, the ni of 0～5% al, 0～1.5% ti and surplus constitute, and its average pore size is not more than 60 μm and relatively ventilative
Coefficient is not less than 80m3/m2Kpa h, its preparation methods steps include:
1) each element powder is mixed according to setting ratio, wherein ni powder use the first nikel powder and the second nikel powder, described first
Nikel powder is strip, and described second nikel powder is spherical or near-spherical, and the ratio of the granularity of described first nikel powder and the second nikel powder is 1:
(1.2～5), and in the first nikel powder account for ni powder gross mass 10～90% ratio add；
2) above-mentioned mixed powder is carried out successively pelletize, drying and pressure forming, baking temperature is set as 40～60 DEG C, be dried
Time is set as 4～8 hours, then carries out pressure forming, during pressure forming under 120～220mpa briquetting pressure pressurize 20～
80 seconds, after pressure forming, obtain pre-molding body；
3) pre-molding body is sintered, process includes at least following two stages: defat stage: sintering temperature is from room temperature liter
To 350～450 DEG C, and it is incubated 60～300 minutes；The high temperature sintering stage: sintering temperature is risen to 1200～1320 DEG C, and is incubated
120～300 minutes；Cooling obtains this porous filtering alloy.
2. the method for claim 1 it is characterised in that: during pelletize adopt stearic acid be granulating agent, stearic addition
Measure 2～8% for mixed powder gross mass.
3. the method for claim 1 it is characterised in that: the ratio of the granularity of described first nikel powder and the second nikel powder be 1:(2
～4).
4. the method as described in any one claim in claims 1 to 3 it is characterised in that: described first nikel powder accounts for ni
The 15～50% of powder gross mass.
5. the method as described in any one claim in claims 1 to 3 it is characterised in that: molding during pressure forming
Pressure is 150～200mpa.
6. the method as described in any one claim in claims 1 to 3 it is characterised in that: described powder sintered porous
The weight percentage filtering al element in alloy is 1～5%.
7. the method as described in any one claim in claims 1 to 3 it is characterised in that: described powder sintered porous
The weight percentage filtering ti element in alloy is 0.2～1%.
8. implement in claim 1 to 7 obtained during any one claim methods described to be used for preparing powder
The sintered porous pre-molding body filtering alloy it is characterised in that: constitute in the powder particle of this pre-molding body ni powder and use
First nikel powder and the second nikel powder, described first nikel powder is strip, and described second nikel powder is spherical or near-spherical, described first nickel
The ratio of the granularity of powder and the second nikel powder is 1:(1.2～5), and the first nikel powder accounts for the 10～90% of ni powder gross mass.
9. pre-molding body as claimed in claim 8 it is characterised in that: the ratio of the granularity of described first nikel powder and the second nikel powder
For 1:(2～4).
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|---|---|---|---|---|
| US4198234A (en) * | 1972-11-10 | 1980-04-15 | Brico Engineering | Sintered metal articles |
| JPS6417805A (en) * | 1987-07-13 | 1989-01-20 | Kobe Steel Ltd | Production of porous sintered compact |
| JPH0211737A (en) * | 1988-06-28 | 1990-01-16 | Ngk Spark Plug Co Ltd | Fe-ni-base porous sintered compact for sliding member |
| JP4066154B2 (en) * | 2002-07-05 | 2008-03-26 | 三菱マテリアル株式会社 | Porous metal gas diffusion sheet for polymer electrolyte fuel cell that exhibits excellent contact surface conductivity over a long period of time |
| CN101229699B (en) * | 2007-01-25 | 2012-06-27 | 湖南科力远新能源股份有限公司 | Lacunaris metal carrier and manufacturing method thereof |
| CN101914707B (en) * | 2010-09-16 | 2012-05-23 | 厦门大学 | Nickel-copper-iron-silicon (Ni-Cu-Fe-Si) porous alloy and preparation method thereof |
| CN102534282A (en) * | 2010-12-08 | 2012-07-04 | 中国科学院金属研究所 | Porous Ti-Ni-Mo ternary shape-memory alloy and preparation method thereof |
| CN102492865B (en) * | 2011-12-01 | 2013-08-14 | 西北有色金属研究院 | Porous material for purifying high-temperature gas and preparation method thereof |
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2014
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