CN107058790A - A kind of enhanced powder metallurgy friction material of intermetallic compound and its production and use - Google Patents
A kind of enhanced powder metallurgy friction material of intermetallic compound and its production and use Download PDFInfo
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- CN107058790A CN107058790A CN201710218065.7A CN201710218065A CN107058790A CN 107058790 A CN107058790 A CN 107058790A CN 201710218065 A CN201710218065 A CN 201710218065A CN 107058790 A CN107058790 A CN 107058790A
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- China
- Prior art keywords
- friction material
- powder
- intermetallic
- powder metallurgy
- metallurgy friction
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- 239000002783 friction material Substances 0.000 title claims abstract description 73
- 229910000765 intermetallic Inorganic materials 0.000 title claims abstract description 71
- 238000004663 powder metallurgy Methods 0.000 title claims abstract description 60
- 238000004519 manufacturing process Methods 0.000 title 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 92
- 239000000843 powder Substances 0.000 claims abstract description 76
- 229910052742 iron Inorganic materials 0.000 claims abstract description 46
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 42
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims abstract description 42
- 238000005245 sintering Methods 0.000 claims abstract description 37
- 239000010949 copper Substances 0.000 claims abstract description 33
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052802 copper Inorganic materials 0.000 claims abstract description 28
- 238000002360 preparation method Methods 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 23
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims abstract description 23
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052581 Si3N4 Inorganic materials 0.000 claims abstract description 22
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 22
- 239000010439 graphite Substances 0.000 claims abstract description 22
- 239000000203 mixture Substances 0.000 claims abstract description 22
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910000604 Ferrochrome Inorganic materials 0.000 claims abstract description 21
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 21
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims abstract description 21
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000002156 mixing Methods 0.000 claims abstract description 15
- 238000003756 stirring Methods 0.000 claims abstract description 13
- 239000012298 atmosphere Substances 0.000 claims abstract description 11
- 230000001681 protective effect Effects 0.000 claims abstract description 11
- 230000008569 process Effects 0.000 claims abstract description 10
- 239000011230 binding agent Substances 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 3
- 150000001875 compounds Chemical class 0.000 claims description 40
- 238000007792 addition Methods 0.000 claims description 25
- 239000004411 aluminium Substances 0.000 claims description 25
- 229910052782 aluminium Inorganic materials 0.000 claims description 25
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 25
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 20
- 238000000498 ball milling Methods 0.000 claims description 14
- 229910052786 argon Inorganic materials 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 8
- 239000001257 hydrogen Substances 0.000 claims description 8
- 229910052739 hydrogen Inorganic materials 0.000 claims description 8
- 239000003350 kerosene Substances 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 4
- 238000007873 sieving Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 3
- KCZFLPPCFOHPNI-UHFFFAOYSA-N alumane;iron Chemical compound [AlH3].[Fe] KCZFLPPCFOHPNI-UHFFFAOYSA-N 0.000 claims description 2
- 150000002736 metal compounds Chemical class 0.000 claims description 2
- 230000003647 oxidation Effects 0.000 claims description 2
- 238000007254 oxidation reaction Methods 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims 1
- 239000001301 oxygen Substances 0.000 claims 1
- 229910052760 oxygen Inorganic materials 0.000 claims 1
- 239000011159 matrix material Substances 0.000 abstract description 23
- 239000002994 raw material Substances 0.000 abstract description 15
- 239000002245 particle Substances 0.000 abstract description 14
- 230000007812 deficiency Effects 0.000 abstract description 2
- 238000005299 abrasion Methods 0.000 description 17
- 239000000463 material Substances 0.000 description 12
- 230000008901 benefit Effects 0.000 description 8
- 238000003825 pressing Methods 0.000 description 7
- 241000357293 Leptobrama muelleri Species 0.000 description 6
- 239000000919 ceramic Substances 0.000 description 6
- 238000011049 filling Methods 0.000 description 6
- 239000010742 number 1 fuel oil Substances 0.000 description 6
- 238000009413 insulation Methods 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 229910052593 corundum Inorganic materials 0.000 description 4
- 230000002708 enhancing effect Effects 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- 229910001845 yogo sapphire Inorganic materials 0.000 description 4
- 238000005275 alloying Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 239000003575 carbonaceous material Substances 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 238000012216 screening Methods 0.000 description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 229910052961 molybdenite Inorganic materials 0.000 description 2
- 229920002994 synthetic fiber Polymers 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910052718 tin Inorganic materials 0.000 description 2
- 239000011135 tin Substances 0.000 description 2
- 229910000951 Aluminide Inorganic materials 0.000 description 1
- 241000208340 Araliaceae Species 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910019829 Cr2AlC Inorganic materials 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910003310 Ni-Al Inorganic materials 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910004349 Ti-Al Inorganic materials 0.000 description 1
- 229910004692 Ti—Al Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- -1 aluminium gold Chemical compound 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 235000006708 antioxidants Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 150000002344 gold compounds Chemical class 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000009916 joint effect Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/05—Mixtures of metal powder with non-metallic powder
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0005—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with at least one oxide and at least one of carbides, nitrides, borides or silicides as the main non-metallic constituents
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0084—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ carbon or graphite as the main non-metallic constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0089—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with other, not previously mentioned inorganic compounds as the main non-metallic constituent, e.g. sulfides, glass
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Powder Metallurgy (AREA)
Abstract
The present invention provides a kind of enhanced powder metallurgy friction material of intermetallic compound, and the powder metallurgy friction material is included：Copper 40 60%, iron 10 20%, intermetallic compound powder 5 10%, ferrochrome 8 12%, graphite 5 12%, molybdenum disulfide 3 5%, barium sulfate 1 2%, silica 2 4%, aluminum oxide 1 3%, silicon nitride 2 4%；Intermetallic Powder Metallurgy friction material preparation method of the present invention includes：(1) weigh in proportion after each raw material mixing, add binding agent, stirring；(2) the mixture cold moudling for obtaining step (1)；(3) pressed compact for obtaining step (2) sintering processes under protective atmosphere, rear cooling；The Intermetallic Powder Metallurgy friction material of the present invention strengthens phase using intermetallic compound particle as matrix, effectively overcome the deficiencies in the prior art, the larger combination property for improving brake pad, particularly its high temperature friction performance, shear strength and wearability.
Description
Technical field
The invention belongs to friction material field, and in particular to a kind of intermetallic compound powder for bullet train brake lining
Metallurgical friction material and preparation method thereof.
Background technology
Bullet train mainly experienced synthetic material, carbon material and powdered metallurgical material three with the development of brake pad material
The individual stage.Wherein, synthetic material brake lining be it is earliest use and use time most long brake material, but because its braking ability exists
It is remarkably decreased under hot conditions, wear rate is sharply increased, has not been suitable for more than speed per hour 200km/h bullet train；Carbon material
Brake lining is then the new-type friction material given priority in recent years, is used widely on civil aircraft and racing car, its have than
The small, intensity of weight is high, modulus is big, thermal coefficient of expansion is small, high temperature resistant many advantages, such as, but the coefficient of friction of carbon material can be with system
The rising of dynamic temperature and increased dramatically, cause abrasion loss larger, and very sensitive to moist and salt mist environment, it is difficult to meet train complete
The military service demand of weather and complex working condition；Powder metallurgy brake pad is by the way that the one kind sintered after powder pressing forming is combined
Material, it realizes metal or nonmetallic alloying, integrates various metals and nonmetallic advantage, good heat conductivity,
Stable friction factor, as the main flow brake friction material assembled on the bullet train runed online at present.
With flourishing that China Express Railway is built, the overall trip speed of train will be continued to lift up, and service condition also will
Harsher, this combination property to train brake plate proposes higher requirement.Copper based powder metallurgy friction material is compared
There is thermal conductive resin in traditional iron-based powder metallurgy friction material, and the brake disc generation with cast iron quality is difficult during braking
Bond；But replace iron to sacrifice the partial intensities of friction material as matrix using copper and cause copper-base powder metallurgy brake lining to exist
Arrisdefect, the phenomenon of chip off-falling are frequently occurred in braking procedure, potential safety hazard is caused；In addition, copper based powder metallurgy friction material belongs to
Porous material, hardness is small, at high speeds braking abrasion it is higher, need to frequently change, life of product is generally shorter, use cost compared with
It is high.
In the prior art, the method frequently with addition alloying element is strong come the matrix for improving copper based powder metallurgy friction material
Disclosed in degree, such as Chinese patent CN201210082460.4 and with the addition of Zn-ef ficiency；Chinese patent CN201510427053.6
In with the addition of tin element；The elements such as aluminium, magnesium, silver, tin are with the addition of in Chinese patent CN201510541995.7.But in above-mentioned patent
The high temperature that the low-melting-point metal added can not easily be produced in sintering with matrix combination without repetition, remaining a small amount of simple substance in braking
Lower softening is melted and occurs adhesive wear phenomenon, or even is splashed in the form of spark, is left pit in friction surface, is exacerbated
Abrasion.
In addition, improving the high temperature friction of brake pad by increasing the species or quantity of ceramic particle in the prior art
And wearability, realize the purpose of reduction abrasion.For example in Chinese patent CN201310203965.6 it with the addition of Cr2AlC particles；In
Mullite is with the addition of in state patent CN201410765239.8；Zircon is with the addition of in Chinese patent CN201510427053.6
Deng.From microscopic appearance, ceramic particle is very poor with substrate combinating strength, and ceramics belong to hard crisp phase, easily occur during stress broken
Generation abrasive wear is split, large-sized ceramic particle can also scratch brake disk surface, cause " to aggravate mating plate abrasion for cost to come
Reduce brake lining itself abrasion " illusion, disk friction pair has been run counter to consume the design original intention based on brake lining.
Numerous research institutions are lifted using novel reinforced means to the combination property of brake lining regarding to the issue above.China
With the Al of disperse in patent CN20130148199.82O3Strengthened copper alloy improves the intensity of matrix, fatigue behaviour as matrix
And anti-wear performance.But Al2O3Presence improve matrix copper diffusion starting potential energy, make bulk diffusion be difficult to start, hinder powder
The room flowing at neck is sintered between particle, has delayed to sinter growing up for neck, has had very strong inhibitory action to the sintering of copper, reduce
The continuity of matrix.Chinese patent CN201610632723.2 adds the eutectoid steel grinding with pearlitic structrure in the base
Powder, develops stable friction factor and wears away low brake lining, but in sintering Ovshinsky will occur for the pearlitic structrure in grounds travel
Body changes, and destroys initial pearlitic structrure and even generates uncontrollable unknown tissue, the combination property to brake lining is brought negatively
Influence.
The content of the invention
For problem above, the purpose of the present invention is as matrix enhancing phase, with effective using intermetallic compound particle
Overcome the deficiencies in the prior art, lift the combination property of brake pad, particularly its high temperature friction performance, shearing by force
Degree and wearability.
For realizing that the technical scheme of above-mentioned purpose is as follows：
The present invention provides a kind of enhanced powder metallurgy friction material of intermetallic compound, the powder metallurgy friction material
Comprising：Copper, iron, intermetallic compound powder, ferrochrome, graphite, molybdenum disulfide, barium sulfate, silica, aluminum oxide, silicon nitride.
Preferably, by mass percentage, the powder metallurgy friction material is included：Copper 40-60%, iron 10-20%, gold
Compound powder 5-10%, ferrochrome 8-12%, graphite 5-12%, molybdenum disulfide 3-5%, barium sulfate 1-2%, silica 2- between category
4%th, aluminum oxide 1-3%, silicon nitride 2-4%；
Preferably, by mass percentage, the powder metallurgy friction material is included：Change between copper 45%, iron 12%, metal
Compound powder 10%, ferrochrome 8%, graphite 8%, molybdenum disulfide 5%, barium sulfate 2%, silica 3%, aluminum oxide 3%, silicon nitride
4%.
Preferably, the powder metallurgy friction material by copper, iron, intermetallic compound powder, ferrochrome, graphite, molybdenum disulfide,
Barium sulfate, silica, aluminum oxide, silicon nitride composition；
Preferably, by mass percentage, the powder metallurgy friction material is by copper 40-60%, iron 10-20%, metal
Between compound powder 5-10%, ferrochrome 8-12%, graphite 5-12%, molybdenum disulfide 3-5%, barium sulfate 1-2%, silica 2-
4%th, aluminum oxide 1-3%, silicon nitride 2-4% are constituted；
Preferably, by mass percentage, the powder metallurgy friction material is by copper 45%, iron 12%, intermetallic
Thing powder 10%, ferrochrome 8%, graphite 8%, molybdenum disulfide 5%, barium sulfate 2%, silica 3%, aluminum oxide 3%, silicon nitride
4% composition；
Preferably, the intermetallic compound powder is intermetallic Fe-Al compound powder；
Preferably, the intermetallic Fe-Al compound powder includes iron and aluminium；
Preferably, by mass percentage, the intermetallic Fe-Al compound powder includes iron 60-75% and aluminium 25-40%；
Preferably, by mass percentage, the intermetallic Fe-Al compound powder includes iron 65% and aluminium 35%.
Preferably, the intermetallic Fe-Al compound powder is made by the preparation method comprised the following steps：Claim in proportion
Take pure iron (purity>99.8%) with aluminium powder (purity>99.8%), ball milling, sieving under argon gas protection and high temperature, obtains iron aluminium gold
Compound powder between category；
Preferably, the high temperature is 670-780 DEG C；
Preferably, the rotating speed of the ball milling is 80-100r/min, preferably 100r/min；
Preferably, the time of the ball milling is 24-48h；
Preferably, the granularity of the obtained intermetallic Fe-Al compound powder is 600-800 mesh.
Preferably, the intermetallic Fe-Al compound powder is made by the solid losses method comprised the following steps：
Pure iron ball (purity is weighed in proportion>99.8%) with aluminium powder (purity>99.8%), argon gas protection, 670-780 DEG C
At a temperature of, with 80-100r/min rotating speed, after ball milling 24-48h, sieving is obtained between the iron aluminum metal that granularity is 600-800 mesh
Compound powder.
Purposes of the enhanced powder metallurgy friction material of intermetallic compound of the present invention in brake pad is prepared.
The present invention also provides a kind of brake pad, and the brake pad is by the enhanced powder of intermetallic compound of the present invention
Last metallurgical friction material is made.
The preparation method of the enhanced powder metallurgy friction material of intermetallic compound of the present invention, the preparation method bag
Include following steps：
(1) weigh in proportion copper, iron, intermetallic compound powder, ferrochrome, graphite, molybdenum disulfide, barium sulfate, silica,
After aluminum oxide, silicon nitride mixing, binding agent, stirring are added；
(2) the mixture cold moudling for obtaining step (1)；
(3) pressed compact for obtaining step (2) sintering processes under protective atmosphere, cooling.
Preferably, in the step (1), the binding agent is kerosene；
The powder metallurgy friction material gross weight meter is preferably based on, the addition of the binding agent is 0.5-
1.5%；It is preferred that 1%；
Preferably, the speed of the stirring is 200-400r/min, preferably 400r/min；
Preferably, the time of the stirring is 20-40min, preferably 20min；
Preferably, in the step (2), the pressure of the cold moudling is 30-45MPa, preferably 45MPa；Preferably, institute
State holding pressure 10-30s, preferably 10s in cold moudling；
Preferably, in the step (3), the protective atmosphere is nitrogen and hydrogen mixture；Preferably, the pressure of the sintering processes
Power is 0.8-2MPa, preferably 0.8MPa；Preferably, the temperature of the sintering processes is 850-1000 DEG C, preferably 1000 DEG C；It is described
Keeping temperature 2-3h in sintering processes, preferably 2h；Preferably, it is described to be cooled to≤100 DEG C.
Intermetallic compound is a kind of material between metal and ceramics, with high-melting-point, high rigidity and good
Wearability, the long range ordering of its makes it have excellent mechanical performance, and mechanical performance particularly under the high temperature conditions is more
Prominent, the stabilization of frictional behaviour plays a key effect under operating mode of the flash temperature more than 800 DEG C when this is braked to high speed.The present invention
The enhanced powder metallurgy friction material of intermetallic compound of offer, metallic matrix is mutually improved using intermetallic compound addition
Combination property, thereby is achieved the bullet train with high tenacity, high intensity, low abrasion and stable high temperature friction performance and use
Powder metallurgy brake pad.
Compared with prior art, the invention has the advantages that：The intermetallic compound that the present invention is provided is enhanced
Powder metallurgy friction material has high intensity, high tenacity, wear-resistant, high temperature friction steady performance.Added in the present invention
Plus intermetallic compound powder can make friction material friction piece shear strength improve 15-30%, bending strength improve 30-
40%, abrasion reduction 40-60%, in 350km initial velocity brake hards, coefficient of friction does not fail；Further, addition is passed through
Intermetallic Fe-Al compound particle makes the combination property of matrix be significantly improved.
For the intermetallic Fe-Al compound that the present invention is selected, aluminide is domestic and international primary study now and obtains weight
The high temperature ordered intermetallic compound to be in progress, wherein, Fe-Al series intermetallic compounds have that proportion is small, specific strength is high, high temperature
The advantages of anti-oxidant and excellent anti-corrosion performance, and without strategic alloying element such as Ni, Cr etc., raw material is easy to get, and cost is far low
In Ni-Al systems and Ti-Al series intermetallic compounds；In addition, Fe-Al series intermetallic compounds have good wearability and anti-stick
The many advantages such as corrosion and wear resistance under abrasion, abrasive wear and high temperature, being added to as enhancing can in friction material of the present invention
Introduce its high-temperature oxidation resistant, it is corrosion-resistant, wear-resistant the advantages of；For further, a kind of ripe friction material, Fe- are used as
The compositional system and preparation method of the friction material of Al bases are very close with powder metallurgy friction material prepared by the present invention, wherein
Cu, graphite, MoS2、Al2O3、Si3N4Formulation material etc. component also with the present invention is overlapped.Therefore, in the present invention between Fe-Al metals
The addition of compound remains the advantage in terms of its friction and wear behavior, can be realized again with other components in inventive formulation material
Good fusion, makes the overall performance of friction material obtain integrating raising.For example, Fe-Al intermetallic compounds are soaked with Cu matrixes
Well, and and Al2O3Between interface bond strength it is high, Al can be effectively improved2O3The problem of soaking difference between particle and Cu matrixes, makes
Al2O3Particle is more firmly present in Cu matrixes, reduces because of Al in friction process2O3The abrasive wear that particle comes off and caused,
Reduction abrasion.In addition, MoS2The Mo simple substance that decomposition is produced in sintering, which is solid-solubilized in Fe-Al intermetallic compounds, can form solid solution
Reinforcing, if further improving Mo content, can produce precipitation strength in grain boundaries formation precipitated phase, be remarkably improved Fe-Al
The elevated temperature strength (being mainly shown as tensile strength and creep resistance) of intermetallic compound, it is steady when producing high temperature under high speed is braked
Surely the intensity of matrix material is lived, it is highly beneficial to stablizing coefficient of friction and reduction abrasion.
The inventors discovered that, ceramic particle is to be present in embedded form in matrix, and intermetallic compound with it is copper-based
Soak good between body, form firm metallurgical binding, become continuous whole entirety, by intermetallic compound hardness it is high,
Intensity is high, the excellent specific property of wear resistant corrosion resistant is introduced into matrix, matrix is fully strengthened.The intensity of intermetallic compound with
The rise for temperature is not continuous decrease, but first raises and decline afterwards, and this unique temperature-strength relationship makes matrix at a high speed
Braking remains to keep higher-strength at a high temperature of producing, and macro manifestations are that coefficient of friction of the friction material when high speed is braked is kept
It is stable not fail.The technology for producing of intermetallic compound particle of the present invention is ripe, and with low cost, development prospect is good
It is good.
Embodiment
Illustrate the present invention referring to specific embodiment.It will be appreciated by those skilled in the art that these embodiments are only
For illustrating the present invention, it does not limit the scope of the present invention in any way.
Experimental method in following embodiments, is conventional method unless otherwise specified.Original used in following embodiments
Material, reagent material etc., unless otherwise specified, are commercially available products.
Embodiment 1：The preparation of the enhanced powder metallurgy friction material of intermetallic compound of the present invention
1. raw material：Copper 400g, iron 200g, intermetallic Fe-Al compound powder 50g, ferrochrome 100g, graphite 110g, molybdenum disulfide
30g, barium sulfate 10g, silica 40g, aluminum oxide 20g, silicon nitride 40g, kerosene 10g；
2. the preparation of intermetallic Fe-Al compound powder is prepared using solid losses method：Weigh pure iron 130g (purity>
99.8%) with aluminium 70g (purity>99.8%)；Pure iron and aluminium powder are fitted into ball grinder, argon filling gas shielded, in 670 DEG C of temperature
Under with after 80r/min rotating speed ball milling 48h take out sieve, obtain granularity be 600-800 mesh intermetallic Fe-Al compound powder；
3. prepare the enhanced powder metallurgy friction material of intermetallic compound：Each raw material is put into mixer, batch mixing adds
Coal oil, stirring.Mixer rotating speed 200r/min, mixing time 40min；It is afterwards that mixture cold is molded, pressing pressure
30MPa, pressurize 30s；Pressed compact is placed in steel back afterwards and sintered, sintering pressure is 2MPa, sintering temperature is 850 DEG C, is incubated 3h,
After cool to 100 DEG C with the furnace and come out of the stove, protective atmosphere is nitrogen and hydrogen mixture.
Embodiment 2：The preparation of the enhanced powder metallurgy friction material of intermetallic compound of the present invention
1. raw material：Copper 500g, iron 150g, intermetallic Fe-Al compound powder 60g, ferrochrome 80g, graphite 80g, molybdenum disulfide
40g, barium sulfate 10g, silica 20g, aluminum oxide 30g, silicon nitride 30g, kerosene 10g；
2. the preparation of intermetallic Fe-Al compound powder is prepared using solid losses method：Weigh pure iron 130g (purity>
99.8%) with aluminium 70g (purity>99.8%)；Pure iron and aluminium powder are fitted into ball grinder, argon filling gas shielded, in 690 DEG C of temperature
Under with after 80r/min rotating speed ball milling 48h take out sieve, obtain granularity be 600-800 mesh intermetallic Fe-Al compound powder；
3. prepare the enhanced powder metallurgy friction material of intermetallic compound：Each raw material is put into batch mixing in mixer, added
Coal oil, stirring.Mixer rotating speed 300r/min, mixing time 30min；It is afterwards that mixture cold is molded, pressing pressure
35MPa, pressurize 25s；Pressed compact is placed in steel back afterwards and sintered, sintering pressure is 1.5MPa, sintering temperature is 900 DEG C, insulation
3h, after cool to 100 DEG C with the furnace and come out of the stove, protective atmosphere is nitrogen and hydrogen mixture.
Embodiment 3：The preparation of the enhanced powder metallurgy friction material of intermetallic compound of the present invention
1. raw material：Copper 600g, iron 100g, intermetallic Fe-Al compound powder 70g, ferrochrome 80g, graphite 60g, molybdenum disulfide
30g, barium sulfate 10g, silica 20g, aluminum oxide 10g, silicon nitride 20g, kerosene 20g；
2. the preparation of intermetallic Fe-Al compound powder is prepared using solid losses method：Weigh pure iron 140g (purity>
99.8%) with aluminium 60g (purity>99.8%)；Pure iron and aluminium powder are fitted into ball grinder, argon filling gas shielded, in 720 DEG C of temperature
Under with after 80r/min rotating speed ball milling 48h take out sieve, obtain granularity be 600-800 mesh intermetallic Fe-Al compound powder；
3. prepare the enhanced powder metallurgy friction material of intermetallic compound：Each raw material is put into mixer, batch mixing adds
Coal oil, stirring.Mixer rotating speed 400r/min, mixing time 20min；It is afterwards that mixture cold is molded, pressing pressure
40MPa, pressurize 20s；Pressed compact is placed in steel back afterwards and sintered, sintering pressure is 1.2MPa, sintering temperature is 950 DEG C, insulation
2.5h, after cool to 80 DEG C with the furnace and come out of the stove, protective atmosphere is nitrogen and hydrogen mixture.
Embodiment 4：The preparation of the enhanced powder metallurgy friction material of intermetallic compound of the present invention
1. raw material：Copper 450g, iron 150g, intermetallic Fe-Al compound powder 80g, ferrochrome 100g, graphite 50g, molybdenum disulfide
50g, barium sulfate 20g, silica 30g, aluminum oxide 30g, silicon nitride 40g, kerosene 20g；
2. the preparation of intermetallic Fe-Al compound powder is prepared using solid losses method：Weigh pure iron 150g (purity>
99.8%) with aluminium 50g (purity>99.8%)；Pure iron and aluminium powder are fitted into ball grinder, argon filling gas shielded, in 750 DEG C of temperature
Under with after 80r/min rotating speed ball milling 48h take out sieve, obtain granularity be 600-800 mesh intermetallic Fe-Al compound powder；
3. prepare the enhanced powder metallurgy friction material of intermetallic compound：Each raw material is put into mixer, batch mixing adds
Coal oil, stirring.Mixer rotating speed 400r/min, mixing time 20min；It is afterwards that mixture cold is molded, pressing pressure
45MPa, pressurize 10s；Pressed compact is placed in steel back afterwards and sintered, sintering pressure is 0.8MPa, sintering temperature is 1000 DEG C, insulation
2h, after cool to 80 DEG C with the furnace and come out of the stove, protective atmosphere is nitrogen and hydrogen mixture.
Embodiment 5：The preparation of the enhanced powder metallurgy friction material of intermetallic compound of the present invention
1. raw material：Copper 450g, iron 150g, intermetallic Fe-Al compound powder 90g, ferrochrome 90g, graphite 90g, molybdenum disulfide
50g, barium sulfate 20g, silica 20g, aluminum oxide 10g, silicon nitride 30g, kerosene 10g；
2. the preparation of intermetallic Fe-Al compound powder is prepared using solid losses method：Weigh pure iron 130g (purity>
99.8%) with aluminium 70g (purity>99.8%)；Pure iron and aluminium powder are fitted into ball grinder, argon filling gas shielded, in 780 DEG C of temperature
Under with after 100r/min rotating speed ball milling 24h take out sieve, obtain granularity be 600-800 mesh intermetallic Fe-Al compound powder；
3. prepare the enhanced powder metallurgy friction material of intermetallic compound：Each raw material is put into mixer, batch mixing adds
Coal oil, stirring.Mixer rotating speed 400r/min, mixing time 20min；It is afterwards that mixture cold is molded, pressing pressure
45MPa, pressurize 10s；Pressed compact is placed in steel back afterwards and sintered, sintering pressure is 0.8MPa, sintering temperature is 1000 DEG C, insulation
2h, after cool to 100 DEG C with the furnace and come out of the stove, protective atmosphere is nitrogen and hydrogen mixture.
Embodiment 6：The preparation of the enhanced powder metallurgy friction material of intermetallic compound of the present invention
1. raw material：Copper 460g, iron 130g, intermetallic Fe-Al compound powder 100g, ferrochrome 90g, graphite 100g, molybdenum disulfide
50g, barium sulfate 20g, silica 20g, aluminum oxide 10g, silicon nitride 20g, kerosene 10g；
2. the preparation of intermetallic Fe-Al compound powder is prepared using solid losses method：Weigh pure iron 130g (purity>
99.8%) with aluminium 70g (purity>99.8%)；Pure iron and aluminium powder are fitted into ball grinder, argon filling gas shielded, in 700 DEG C of temperature
Under with after 100r/min rotating speed ball milling 36h take out sieve, obtain granularity be 600-800 mesh intermetallic Fe-Al compound powder；
3. prepare the enhanced powder metallurgy friction material of intermetallic compound：Each raw material is put into mixer, batch mixing adds
Coal oil, stirring.Mixer rotating speed 400r/min, mixing time 20min；It is afterwards that mixture cold is molded, pressing pressure
45MPa, pressurize 10s；Pressed compact is placed in steel back afterwards and sintered, sintering pressure is 0.8MPa, sintering temperature is 1000 DEG C, insulation
2h, after cool to 100 DEG C with the furnace and come out of the stove, protective atmosphere is nitrogen and hydrogen mixture.
Table 1 below lists the various embodiments described above sample and is not added with the performance parameter pair of intermetallic compound powder sample
Than.
As can be seen that the satisfactory mechanical property of the enhanced powder metallurgy friction material of intermetallic compound of the present invention,
Hardness, shear strength and bending strength are above rubbing for comparative example 1 (not adding intermetallic compound powder of the present invention)
Wipe material；
1:When carrying out emergency braking testses under 350km/h speed on 1 test braking force platform, change between metal of the present invention
There is the enhanced powder metallurgy friction material of compound stable friction factor not fail, repeatability good, grind under high speed braking condition
The low advantage of consumption, disclosure satisfy that braking requirement during train of high-speed motor train unit operation.
Table 1：The performance parameter contrast of the enhanced powder metallurgy friction material of intermetallic compound of the present invention
Embodiment 7：The consumption screening experiment of intermetallic compound powder of the present invention
In the present invention, it is contemplated that the influence to friction material combination property, strengthened with intermetallic compound of the present invention
The mass percent meter of type powder metallurgy friction material, the addition scope of the Fe-Al intermetallic compounds is 5-10%, such as
Shown in table 2 below：
Table 2：The consumption screening of intermetallic compound powder of the present invention
It can be seen that from upper table 2, when the addition of Fe-Al intermetallic compounds is less than 5%, properties lifting is not clear
Aobvious, enhancing effect is weaker；And when addition is higher than after 10%, hardness number, more than 30HBW, is 20t% even more in addition
When reach 35.46HBW.And brake lining excessive high hardness can have undesirable effect to brake disc, the brake disc longevity is shortened in aggravation card abrasion
Life, does not meet practice requirement.In addition, the lifting speed of shear strength and bending strength with addition increase and under
Drop, continues addition Fe-Al intermetallic compounds enhancing effect unobvious after addition reaches 10%.
In terms of friction and wear behavior, when addition is higher than after 10%, average friction coefficient value enters one with addition
Step is improved and is remarkably decreased, or even is reduced to when addition reaches 20% 0.2980, and the value is less than being averaged for non-reinforced sample
Friction co-efficient value.The main cause for causing coefficient of friction significantly to glide is：Fe-Al intermetallic compounds have higher strong in itself
Degree and hardness, there is good anti-adhesion in friction, and the area of hard phase point in matrix is added during a large amount of additions, is caused
Adhesion and engaging property of the brake lining with antithesis are poor, reduce coefficient of friction.And when addition continues to increase, abrasion loss is remained in that
Downward trend.This is due to that Fe-Al intermetallic compounds have higher work hardening rate, and wearability is good.Also correspond to simultaneously
Above the problem of friction material excessive high hardness, excessive Fe-Al intermetallic compounds are likely to result in mating plate abrasion aggravation, and
Showed in the form of itself abrasion reduction.
In summary, consider Fe-Al intermetallic compounds addition influences on the properties of friction material, preferably
It is 5-10% to go out addition in the present invention.
Embodiment 8：The technique ginseng of the enhanced powder metallurgy friction material preparation method of intermetallic compound of the present invention
Number screening experiment
In the preparation method of the enhanced powder metallurgy friction material of intermetallic compound of the present invention, key process parameter
For the sintering temperature in the cold moudling pressure in the step (2) and the step (3).
Wherein, the selection of cold moudling pressure will directly affect sintering effect and finally influence end properties.Cold moudling
The selection of pressure is based on the control to example weight and thickness, when the requirement of weight and thickness is certain value, cold moudling pressure
Power need to be more than 25MPa and be molded green compact.On this basis, when cold moudling pressure is more than 30MPa, then green surface is more
Densification, with some strength, possesses sintering condition；And when cold moudling pressure is more than 45MPa, it is existing that overvoltage occurs in green surface
As cracking, hard particles are squeezed out matrix surface, do not possess sintering condition.Therefore the scope of selection cold moudling pressure
For 30-45MPa.
The selection then fusing point based on raw material of sintering temperature, is defined by the fusing point of metallic matrix.In the present invention, the powder
The sintering temperature of metallurgical part is less than metallic matrix fusing point, and a small amount of liquid phase is there may be based on solid-phase sintering, in sintering process；
Matrix Cu fusing point is 1083 DEG C, and selection is sintered less than the temperature range of 50-250 DEG C of fusing point, before ensureing that matrix is infusible
The diffusion coefficient for improving element as far as possible is put, makes fully to combine to form sintering neck between powder granule, improves matrix strength.Meanwhile,
Consider Cost Problems as product, reduce sintering temperature as far as possible on the premise of sintering strength is ensured, reduce energy consumption, therefore selection is burnt
Junction temperature scope is 850-1000 DEG C, as shown in table 3 below：
Table 3：Cold moudling in the enhanced powder metallurgy friction material preparation method of intermetallic compound of the present invention
Pressure and sintering temperature influence on end properties
As shown in table 3, influence of the cold moudling pressure to hardness, density is larger, and shear strength is simultaneously by above-mentioned two
Plant the joint effect of parameter.In addition, more loose material friction coefficient is high, abrasion loss is big, and finer and close material friction coefficient is low,
Abrasion loss is small.
In a word, specific description of embodiments of the present invention is not intended to limit the present invention for the above, and those skilled in the art can be with
It is variously modified or is deformed according to the present invention, without departing from the spirit of the present invention, all should belong to right appended by the present invention will
The scope asked.
Claims (9)
1. a kind of enhanced powder metallurgy friction material of intermetallic compound, the powder metallurgy friction material is included：Copper, iron,
Intermetallic compound powder, ferrochrome, graphite, molybdenum disulfide, barium sulfate, silica, aluminum oxide, silicon nitride.
2. powder metallurgy friction material according to claim 1, it is characterised in that by mass percentage, the powder
Metallurgical friction material is included：Copper 40-60%, iron 10-20%, intermetallic compound powder 5-10%, ferrochrome 8-12%, graphite 5-
12%th, molybdenum disulfide 3-5%, barium sulfate 1-2%, silica 2-4%, aluminum oxide 1-3%, silicon nitride 2-4%；；
Preferably, by mass percentage, the powder metallurgy friction material is included：Copper 45%, iron 12%, intermetallic compound
Powder 10%, ferrochrome 8%, graphite 8%, molybdenum disulfide 5%, barium sulfate 2%, silica 3%, aluminum oxide 3%, silicon nitride 4%.
3. powder metallurgy friction material according to claim 1 or 2, it is characterised in that the powder metallurgy friction material
It is made up of copper, iron, intermetallic compound powder, ferrochrome, graphite, molybdenum disulfide, barium sulfate, silica, aluminum oxide, silicon nitride；
Preferably, by mass percentage, the powder metallurgy friction material is changed between copper 40-60%, iron 10-20%, metal
Compound powder 5-10%, ferrochrome 8-12%, graphite 5-12%, molybdenum disulfide 3-5%, barium sulfate 1-2%, silica 2-4%, oxygen
Change aluminium 1-3%, silicon nitride 2-4% composition；
Preferably, by mass percentage, the powder metallurgy friction material is by copper 45%, iron 12%, intermetallic compound powder
10%th, ferrochrome 8%, graphite 8%, molybdenum disulfide 5%, barium sulfate 2%, silica 3%, aluminum oxide 3%, 4% group of silicon nitride
Into.
4. powder metallurgy friction material according to claim 1 or 2, it is characterised in that the intermetallic compound powder is
Intermetallic Fe-Al compound powder；
Preferably, the intermetallic Fe-Al compound powder includes iron and aluminium；
Preferably, by mass percentage, the intermetallic Fe-Al compound powder includes iron 60-75% and aluminium 25-40%；
Preferably, by mass percentage, the intermetallic Fe-Al compound powder includes iron 65% and aluminium 35%.
5. powder metallurgy friction material according to claim 1 or 2, it is characterised in that the intermetallic Fe-Al compound
Powder is made by the preparation method comprised the following steps：Pure iron (purity is weighed in proportion>99.8%) with aluminium powder (purity>
99.8%), ball milling, sieving under argon gas protection and high temperature, obtains intermetallic Fe-Al compound powder；
Preferably, the high temperature is 670-780 DEG C；
Preferably, the rotating speed of the ball milling is 80-100r/min, preferably 100r/min；
Preferably, the time of the ball milling is 24-48h；
Preferably, the granularity of the obtained intermetallic Fe-Al compound powder is 600-800 mesh l；
Preferably, the intermetallic Fe-Al compound powder is made by the solid losses method comprised the following steps：
Pure iron ball (purity is weighed in proportion>99.8%) with aluminium powder (purity>99.8%), in argon gas protection, 670-780 DEG C of temperature
Under, with 80-100r/min rotating speed, after ball milling 24-48h, sieving obtains chemical combination between the iron aluminum metal that granularity is 600-800 mesh
Thing powder.
6. the enhanced powder metallurgy friction material of intermetallic compound as any one of claim 1 to 5 is preparing system
Purposes in dynamic brake lining.
7. a kind of brake pad, it is characterised in that the brake pad is as the metal as any one of claim 1 to 5
Between the enhanced powder metallurgy friction material of compound be made.
8. the preparation of the enhanced powder metallurgy friction material of intermetallic compound according to any one of claim 1 to 5
Method, the preparation method comprises the following steps：
(1) copper, iron, intermetallic compound powder, ferrochrome, graphite, molybdenum disulfide, barium sulfate, silica, oxidation are weighed in proportion
After aluminium, silicon nitride mixing, binding agent, stirring are added；
(2) the mixture cold moudling for obtaining step (1)；
(3) pressed compact for obtaining step (2) sintering processes under protective atmosphere, cooling.
9. the preparation method of the enhanced powder metallurgy friction material of intermetallic compound according to claim 8, its feature
It is, in the step (1), the binding agent is kerosene；
The powder metallurgy friction material gross weight meter is preferably based on, the addition of the binding agent is 0.5-1.5%；It is excellent
Select 1%；
Preferably, the speed of the stirring is 200-400r/min, preferably 400r/min；
Preferably, the time of the stirring is 20-40min, preferably 20min；
Preferably, in the step (2), the pressure of the cold moudling is 30-45MPa, preferably 45MPa；Preferably, it is described cold
Molded middle holding pressure 10-30s, preferably 10s；
Preferably, in the step (3), the protective atmosphere is nitrogen and hydrogen mixture；Preferably, the pressure of the sintering processes is
0.8-2MPa, preferably 0.8MPa；Preferably, the temperature of the sintering processes is 850-1000 DEG C, preferably 1000 DEG C；The sintering
Keeping temperature 2-3h in processing, preferably 2h；Preferably, it is described to be cooled to≤100 DEG C.
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