CN107289050A - A kind of high intensity semi-metallic brake pad - Google Patents
A kind of high intensity semi-metallic brake pad Download PDFInfo
- Publication number
- CN107289050A CN107289050A CN201710706401.2A CN201710706401A CN107289050A CN 107289050 A CN107289050 A CN 107289050A CN 201710706401 A CN201710706401 A CN 201710706401A CN 107289050 A CN107289050 A CN 107289050A
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- Prior art keywords
- parts
- brake pad
- high intensity
- metallic
- metallic brake
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- Pending
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- 239000000835 fiber Substances 0.000 claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 6
- 230000003750 conditioning effect Effects 0.000 claims abstract description 6
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 239000011230 binding agent Substances 0.000 claims abstract description 5
- 239000000945 filler Substances 0.000 claims abstract description 5
- 229920000914 Metallic fiber Polymers 0.000 claims abstract description 4
- 239000000843 powder Substances 0.000 claims description 16
- 229920000459 Nitrile rubber Polymers 0.000 claims description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 9
- 229910052582 BN Inorganic materials 0.000 claims description 8
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 229940007424 antimony trisulfide Drugs 0.000 claims description 8
- NVWBARWTDVQPJD-UHFFFAOYSA-N antimony(3+);trisulfide Chemical compound [S-2].[S-2].[S-2].[Sb+3].[Sb+3] NVWBARWTDVQPJD-UHFFFAOYSA-N 0.000 claims description 8
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims description 8
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 7
- 229920006231 aramid fiber Polymers 0.000 claims description 7
- 239000004917 carbon fiber Substances 0.000 claims description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 7
- 244000226021 Anacardium occidentale Species 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 235000020226 cashew nut Nutrition 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 150000003839 salts Chemical class 0.000 claims description 5
- 229910052902 vermiculite Inorganic materials 0.000 claims description 5
- 239000010455 vermiculite Substances 0.000 claims description 5
- 235000019354 vermiculite Nutrition 0.000 claims description 5
- 229910052845 zircon Inorganic materials 0.000 claims description 5
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims description 5
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 4
- 229920001568 phenolic resin Polymers 0.000 claims description 4
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 3
- 229910052593 corundum Inorganic materials 0.000 claims 1
- 238000005829 trimerization reaction Methods 0.000 claims 1
- 229910001845 yogo sapphire Inorganic materials 0.000 claims 1
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 7
- 239000002783 friction material Substances 0.000 description 3
- 230000001050 lubricating effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000010425 asbestos Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- LCDFWRDNEPDQBV-UHFFFAOYSA-N formaldehyde;phenol;urea Chemical class O=C.NC(N)=O.OC1=CC=CC=C1 LCDFWRDNEPDQBV-UHFFFAOYSA-N 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/02—Composition of linings ; Methods of manufacturing
- F16D69/023—Composite materials containing carbon and carbon fibres or fibres made of carbonizable material
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/02—Composition of linings ; Methods of manufacturing
- F16D69/027—Compositions based on metals or inorganic oxides
- F16D69/028—Compositions based on metals or inorganic oxides containing fibres
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2200/00—Materials; Production methods therefor
- F16D2200/0004—Materials; Production methods therefor metallic
- F16D2200/0008—Ferro
- F16D2200/0021—Steel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2200/00—Materials; Production methods therefor
- F16D2200/0004—Materials; Production methods therefor metallic
- F16D2200/0026—Non-ferro
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2200/00—Materials; Production methods therefor
- F16D2200/0034—Materials; Production methods therefor non-metallic
- F16D2200/0039—Ceramics
- F16D2200/0043—Ceramic base, e.g. metal oxides or ceramic binder
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2200/00—Materials; Production methods therefor
- F16D2200/0034—Materials; Production methods therefor non-metallic
- F16D2200/0052—Carbon
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Composite Materials (AREA)
- Organic Chemistry (AREA)
- Braking Arrangements (AREA)
Abstract
The present invention proposes a kind of high intensity semi-metallic brake pad, including following parts by weight raw material composition：10~30 parts of assorted fibre, 10~35 parts of metallic fiber, 10~25 parts of nanometer binder, 5~10 parts of vitrified bonding, 8~18 parts of frictional property regulator, 10~25 parts of filler, 1~3 part of manufacturability conditioning agent.Brake slice prescription proposed by the invention is reasonable, the brake block stable friction factor of preparation is high, its wear rate is significantly reduced, meanwhile, greatly reduce noise produced during work, reduce the pollution to environment, the intensity of brake block is ensure that, its work toughness is improved, heat-resisting quantity is strong, corrosion is difficult, service life is improved.
Description
Technical field
The present invention relates to brake block technical field, and in particular to a kind of high intensity semi-metallic brake pad.
Background technology
Developing rapidly for science and technology, requirement of the Brake Products to friction material is more and more high, except at a high speed, high temperature is high
Outside security and comfortableness in the case of the bad working environments such as pressure, energy-conservation is had also been proposed in recent years, environmentally friendly, the requirements at the higher level such as cleaning.Ring
In the noise pollution of border, urban transportation noise turns into important pollution sources.Automobile brake noise nuisance driver, occupant health and
Comfortableness, unnecessary uneasiness is caused to pedestrian on road and surrounding resident.In terms of medical angle, 85-90 decibels of noise is
Harm is produced to people, includes the hearing of influence people.Now, citizen have strong complaints to traffic noise.
At this stage, semi-metallic brake pad is widely used in low and middle-grade vehicle main frames due to low cost, moderate performance
Supporting market.And in semimetal material friction material substitution early stage asbestos resin friction materials process, handle bad bring
One of side effect be exactly significantly multiple brake noise produce.This multiple low frequency noise is mainly due to half
Have what a large amount of steel fibres triggered in metal formulations, this greatly reduces the riding comfort of driver and conductor.Moreover, pyroconductivity
It is too high, larger is damaged to brake disc, meanwhile, low intensity, poor toughness, also so as to influence the stability of the coefficient of friction of brake block.
Therefore, in view of the above-mentioned problems, the present invention proposes a kind of new technical scheme.
The content of the invention
It is strong it is an object of the invention to provide a kind of stable friction factor, corrosion is difficult, the low noise of low wear rate is high-strength
Spend semi-metallic brake pad.
The present invention is achieved through the following technical solutions：
A kind of high intensity semi-metallic brake pad, including following parts by weight raw material composition：10~30 parts of assorted fibre, metal
10~35 parts of fiber, 10~25 parts of nanometer binder, 5~10 parts of vitrified bonding, 8~18 parts of frictional property regulator, filler
10~25 parts, 1~3 part of manufacturability conditioning agent.
Preferably, the assorted fibre includes 5~15 parts of aramid fiber, 3~10 parts of steel fibre and 2~5 parts of carbon
Fiber.
Preferably, the metallic fiber includes 5~20 parts of iron(-)base powder, 5~15 parts of copper powder.
Preferably, the nanometer binder is that 5~15 parts of nanometer acrylonitrile-butadiene rubber powder and 5~10 parts of cashew nut shell are modified phenol
Urea formaldehyde.
Preferably, the vitrified bonding is triple salt.
Preferably, the frictional property regulator includes 2~6 parts of graphite powder, 2~5 parts of molybdenum disulfide and 3~5 parts
Nanoscale alundum (Al2O3).
Preferably, the filler includes 2~5 parts of boron nitride, 1~3 part of vermiculite, 0~5 part of blanc fixe, 1~5
The antimony trisulfide and 2~4 parts of zircon of part.
Preferably, the aramid fiber, steel fibre and carbon fiber are ground into 0.2~0.5mm by airslide disintegrating mill.
The beneficial effects of the invention are as follows：Brake slice prescription proposed by the invention is reasonable, the brake block coefficient of friction of preparation
Stability is high, significantly reduces its wear rate, meanwhile, noise produced during work is greatly reduced, is reduced to environment
Pollution, it is ensured that the intensity of brake block, improve its work toughness, heat-resisting quantity is strong, is difficult corrosion, improves and use the longevity
Life.
Embodiment
The present invention is described further with reference to embodiment.
Embodiment 1
A kind of high intensity semi-metallic brake pad, including following parts by weight raw material composition：5 parts of aramid fiber, steel fibre 3~
Part, 2 parts of carbon fiber, 5 parts of iron(-)base powder, 5 parts of copper powder, 5 parts of nanometer acrylonitrile-butadiene rubber powder, 5 parts of cashew nut shell phenol-formaldehyde resin modified,
5 parts of triple salt, 2 parts of graphite powder, 2 parts of molybdenum disulfide, 3 parts of nanoscale alundum (Al2O3), 2 parts of boron nitride, 1 part of vermiculite, antimony trisulfide 1
Part, 2 parts of zircon, 1 part of manufacturability conditioning agent.
In the brake block course of work, brake block is more stable when working, and the vibrations of generation and noise are smaller, improves stable material
Material includes nanometer acrylonitrile-butadiene rubber powder, graphite powder, molybdenum disulfide and antimony trisulfide.Meanwhile, nanometer acrylonitrile-butadiene rubber powder improves brake block
Flexility, assorted fibre has good antisticking and lubricating ability, further increasing its stability, moreover, three
Polysalt, nanoscale alundum (Al2O3) and boron nitride improve the intensity of brake block.
Embodiment 2
A kind of high intensity semi-metallic brake pad, including following parts by weight raw material composition：8 parts of aramid fiber, steel fibre 5
Part, 4 parts of carbon fiber, 12 parts of iron(-)base powder, 8 parts of copper powder, 10 parts of nanometer acrylonitrile-butadiene rubber powder, cashew nut shell phenol-formaldehyde resin modified 7
Part, 7 parts of triple salt, 4 parts of graphite powder, 3 parts of molybdenum disulfide, 4 parts of nanoscale alundum (Al2O3), 4 parts of boron nitride, 2 parts of vermiculite, weight are brilliant
3 parts of stone flour, 4 parts of antimony trisulfide, 3 parts of zircon, 2 parts of manufacturability conditioning agent.
In the brake block course of work, brake block is more stable when working, and the vibrations of generation and noise are smaller, improves stable material
Material includes nanometer acrylonitrile-butadiene rubber powder, graphite powder, molybdenum disulfide and antimony trisulfide.Meanwhile, nanometer acrylonitrile-butadiene rubber powder improves brake block
Flexility, assorted fibre has good antisticking and lubricating ability, further increasing its stability, moreover, three
Polysalt, nanoscale alundum (Al2O3) and boron nitride improve the intensity of brake block.
Embodiment 3
A kind of high intensity semi-metallic brake pad, including following parts by weight raw material composition：15 parts of aramid fiber, steel fibre 10
Part, 5 parts of carbon fiber, 20 parts of iron(-)base powder, 15 parts of copper powder, 15 parts of nanometer acrylonitrile-butadiene rubber powder, cashew nut shell phenol-formaldehyde resin modified
10 parts, 10 parts of triple salt, 6 parts of graphite powder, 5 parts of molybdenum disulfide, 5 parts of nanoscale alundum (Al2O3), 5 parts of boron nitride, 3 parts of vermiculite,
5 parts of blanc fixe, 5 parts of antimony trisulfide, 4 parts of zircon, 3 parts of manufacturability conditioning agent.
In the brake block course of work, brake block is more stable when working, and the vibrations of generation and noise are smaller, improves stable material
Material includes nanometer acrylonitrile-butadiene rubber powder, graphite powder, molybdenum disulfide and antimony trisulfide.Meanwhile, nanometer acrylonitrile-butadiene rubber powder improves brake block
Flexility, assorted fibre has good antisticking and lubricating ability, further increasing its stability, moreover, three
Polysalt, nanoscale alundum (Al2O3) and boron nitride improve the intensity of brake block.
Rationally, the brake block stable friction factor of preparation is high, is effectively reduced for brake slice prescription proposed by the invention
Its wear rate, meanwhile, noise produced during work is greatly reduced, reduce the pollution to environment, it is ensured that brake block
Intensity, improve its work toughness, heat-resisting quantity is strong, is difficult corrosion, improves service life.
It is described above, only it is embodiments of the invention, is not the limitation for making any other form to the present invention, and
Any modification made according to embodiment proposed by the invention or equivalent variations, still fall within model claimed of the invention
Enclose.
Claims (8)
1. a kind of high intensity semi-metallic brake pad, it is characterised in that：Including following parts by weight raw material composition：Assorted fibre 10~
30 parts, 10~35 parts of metallic fiber, 10~25 parts of nanometer binder, 5~10 parts of vitrified bonding, frictional property regulator 8~
18 parts, 10~25 parts of filler, 1~3 part of manufacturability conditioning agent.
2. a kind of high intensity semi-metallic brake pad according to claim 1, it is characterised in that：The assorted fibre include 5~
15 parts of aramid fiber, 3~10 parts of steel fibre and 2~5 parts of carbon fiber.
3. a kind of high intensity semi-metallic brake pad described in claim 1, it is characterised in that：The metallic fiber includes 5~20 parts
Iron(-)base powder, 5~15 parts of copper powder.
4. a kind of high intensity semi-metallic brake pad according to claim 1, it is characterised in that：The nanometer binder be 5~
15 parts of nanometer acrylonitrile-butadiene rubber powder and 5~10 parts of cashew nut shell phenol-formaldehyde resin modified.
5. a kind of high intensity semi-metallic brake pad according to claim 1, it is characterised in that：The vitrified bonding is trimerization
Salt.
6. a kind of high intensity semi-metallic brake pad according to claim 1, it is characterised in that：The frictional property regulator bag
Include 2~6 parts of graphite powder, 2~5 parts of molybdenum disulfide and 3~5 parts of nanoscale alundum (Al2O3).
7. a kind of high intensity semi-metallic brake pad according to claim 1, it is characterised in that：The filler includes 2~5 parts
Boron nitride, 1~3 part of vermiculite, 0~5 part of blanc fixe, 1~5 part of antimony trisulfide and 2~4 parts of zircon.
8. a kind of high intensity semi-metallic brake pad according to claim 2, it is characterised in that：The aramid fiber, steel fibre
0.2~0.5mm is ground into by airslide disintegrating mill with carbon fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710706401.2A CN107289050A (en) | 2017-08-17 | 2017-08-17 | A kind of high intensity semi-metallic brake pad |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710706401.2A CN107289050A (en) | 2017-08-17 | 2017-08-17 | A kind of high intensity semi-metallic brake pad |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107289050A true CN107289050A (en) | 2017-10-24 |
Family
ID=60106081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710706401.2A Pending CN107289050A (en) | 2017-08-17 | 2017-08-17 | A kind of high intensity semi-metallic brake pad |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107289050A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109595279A (en) * | 2018-12-26 | 2019-04-09 | 深圳市智雅墨族科技有限公司 | The preparation method of the nanometer enhanced carbon-silicon carbide brake material of servo |
| CN111101082A (en) * | 2019-12-25 | 2020-05-05 | 安徽锵信网络科技有限公司 | Metal ceramic composite material for new energy automobile brake pad and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104315045A (en) * | 2014-09-16 | 2015-01-28 | 湖南博云汽车制动材料有限公司 | Low-cost low-noise semimetal disc type brake pad and preparation method thereof |
| CN107120372A (en) * | 2017-06-11 | 2017-09-01 | 太仓捷公精密金属材料有限公司 | A kind of low noise high intensity semi-metallic brake pad |
-
2017
- 2017-08-17 CN CN201710706401.2A patent/CN107289050A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104315045A (en) * | 2014-09-16 | 2015-01-28 | 湖南博云汽车制动材料有限公司 | Low-cost low-noise semimetal disc type brake pad and preparation method thereof |
| CN107120372A (en) * | 2017-06-11 | 2017-09-01 | 太仓捷公精密金属材料有限公司 | A kind of low noise high intensity semi-metallic brake pad |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109595279A (en) * | 2018-12-26 | 2019-04-09 | 深圳市智雅墨族科技有限公司 | The preparation method of the nanometer enhanced carbon-silicon carbide brake material of servo |
| CN111101082A (en) * | 2019-12-25 | 2020-05-05 | 安徽锵信网络科技有限公司 | Metal ceramic composite material for new energy automobile brake pad and preparation method thereof |
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Application publication date: 20171024 |