CN105566842A - Preparation method of wet fiber reinforced resin-based friction material - Google Patents
Preparation method of wet fiber reinforced resin-based friction material Download PDFInfo
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- CN105566842A CN105566842A CN201510995922.5A CN201510995922A CN105566842A CN 105566842 A CN105566842 A CN 105566842A CN 201510995922 A CN201510995922 A CN 201510995922A CN 105566842 A CN105566842 A CN 105566842A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
- C08L61/04—Condensation polymers of aldehydes or ketones with phenols only
- C08L61/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
- B24D3/20—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially organic
- B24D3/28—Resins or natural or synthetic macromolecular compounds
- B24D3/285—Reaction products obtained from aldehydes or ketones
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Abstract
The invention discloses a preparation method of a wet fiber reinforced resin-based friction material, and is used for solving the technical problem that a conventional preparation method of a friction material wastes energy sources. The preparation method comprises the steps: mixing short fibers, a friction performance regulator and a filler by a dry method, adding a liquid binder resin solution in a kneading device, and kneading, wherein the mass fraction of resin in a liquid binder is 40-70%; and after uniformly kneading and maintaining a certain viscosity, adding the semi-dry raw material after kneading into an extrusion device, thinning into a thin sheet-shaped material with the thickness of 0.4-2.5 mm, drying, and then carrying out curing molding of the thin sheet-shaped material after drying in a hot pressing device, and thus obtaining the wet fiber reinforced resin-based friction material. According to the preparation method, the water consumption in the whole preparation process is 0, the use amount of an organic solvent is saved 45-90% than that of the prior art, besides, the number of the steps of the technological process is reduced to 6 from 12, and thus a lot of energy sources are saved.
Description
Technical field
The present invention relates to a kind of preparation method of friction materials, particularly a kind of wet fiber strengthens the preparation method of resin-matrix friction material.
Background technology
Lubrication friction device (being also wet friction device) is the friction gear that a kind of life-span is long and abrasion loss is relatively little, in lubrication friction device use a kind of operation thickness to be the Wet-type friction material of 0.4 ~ 2.0mm, its thickness is only 1/10 to 1/50 of friction materials thickness in dry friction device.At present, in automatic (gear) automatic gearbox and various humid clutch or wet brake, the maximum a kind of Wet-type friction material of usage quantity is the fiber reinforced resin based friction materials adopting similar paper technology to produce, and is called Wet-type paper friction material or paper friction material.
Prepare Wet-type paper friction material technical process complicated, pulping process needs the process water of at substantial, needs again to remove moisture by drying course, and floods a large amount of binder resin solution, the at substantial energy, and contaminate environment.In the prior art, this Wet-type paper friction material adopts similar paper technology to prepare usually, its method the starting material containing compositions such as staple fibre, frictional property regulator, fillers is adopted wet method making beating mixing, copy paper is shaped to slim precast body material, dry moisture, then steeping liq binder resin solution, then organic solvent is evaporated into after material is in drying regime, under heating and pressurizing condition, make material cured shaping, obtain Wet-type paper friction material through aftertreatment.
Document 1 " application publication number is the Chinese invention patent of CN102305255A " discloses a kind of preparation method of paper friction material, adopt paper pulp fiber and high-performance fiber as reinforcement and cashew nut oil modified alkyd resin, part nano level frictional property regulator and many oxide and graphite etc. are composited, simultaneously by the Reasonable adjustment to traditional technology, the matrix resin curing process of paper base material and adhesive resin curing process are merged into a procedure, and the rear blank operation of impregnation substitute products first impregnation solidification after making the first stamping-out of product, production technique after improvement for prepare burden-pull an oar-manufacturing paper with pulp-drying-stamping-out-impregnation-brush coating-paster-assembling-bonding solidification-abrasive disc-always examine.Prepared friction materials has the advantages such as good stability, frictional coefficient are high, high temperature resistant, production process simplifies simultaneously, slurrying utilization ratio improves greatly, but the method needs to use a large amount of water to carry out slurrying, a kind of huge consumption to water resources, and manufacture paper with pulp shaping after need again by drying moisture removal, the at substantial energy, precast body needs to flood a large amount of binder resin solution simultaneously, not only wastes resource but also contaminate environment.
Document 2 " Authorization Notice No. is the Chinese invention patent of CN100572488C " discloses a kind of manufacture method of double-layered friction materials, paper friction material is strengthened for upper layer with carbon fiber or aramid fiber, isoprene-isobutylene rubber cork type friction materials is bottom, 1:2 ~ 4 by volume, by two kinds of friction materials mixing, 200 ~ 300 DEG C, be compressed on liner under 3 ~ 10MPa, finally solidify 2 ~ 6 hours at 140 ~ 180 DEG C, obtained double-layered friction materials.This double-layered friction materials combines the advantage of paper substrate and cork-rubber base frication material simultaneously, not only make use of the vesicular structure of paper substrate, strengthen heat resistanceheat resistant decline performance, and due to the elasticity of cork-rubber, reduce paper base material to the wearing and tearing of antithesis sheet, reduce wear rate, there is the advantages such as frictional coefficient is high, transmitting torque is large, but this friction materials uses wet processing and rubber rollers sweetening process simultaneously, Production Flow Chart is long, complex manufacturing, the water of paper substrate production at substantial, organic solvent and the energy, drastically increase cost.
Prior art prepares the steady quality of Wet-type paper friction material product, efficiency is high, but all need the wet-layer preparation technology adopting similar paper technology, also exist and use a large amount of process water, molded preforms needs drying and impregnation binder resin solution, complex manufacturing, causes production process to consume energy very large.
Summary of the invention
In order to the deficiency that the preparation method overcoming existing friction materials wastes energy, the invention provides the preparation method that a kind of wet fiber strengthens resin-matrix friction material.After staple fibre, frictional property regulator and filler are passed through dry method batch mixing by the method, in kneader device, add liquid binder resin solution mediate, wherein in liquid-containing binder, the massfraction of resin is 40 ~ 70%, until kneading evenly and after keeping certain viscosity, it is the slice-type material of 0.4 ~ 2.5mm that half dry state starting material after kneading are added thin-pass to thickness in extrusion equipment, dry, again by the slice-type material curing molding in hot-press equipment after oven dry, obtain wet fiber and strengthen resin-matrix friction material.The whole preparation process water consumption of this preparation method is 0, and organic solvent usage quantity saves 45 ~ 90% than background technology, and technical process is simultaneously reduced to 6 steps by 12 steps, can save mass energy.
The technical solution adopted for the present invention to solve the technical problems: a kind of wet fiber strengthens the preparation method of resin-matrix friction material, is characterized in comprising the following steps:
Step one, dry method batch mixing: be the staple fibre of 15 ~ 35% by mass percentage, mass percentage be 5 ~ 30% frictional property regulator and mass percentage be the filler of 20 ~ 55%, first mixed by dry method high-speed stirring, make mixed dry material;
Step 2, semidrying mediate: by mass percentage be 10 ~ 30% resin glue be made into the resin solution that massfraction is 40 ~ 70%, mediate with mixed dry material the leather hard friction materials obtaining mixing through semidrying;
Step 3, thin-pass: make its thin-pass to desired thickness 0.4 ~ 2.5mm by extruding leather hard friction materials, obtain slice-type material;
Step 4, drying and stamping-out: slice-type material is placed in drying and locates to dry for 1 ~ 4 day, stamping-out obtains required slice-type friction materials precast body;
Step 5, hot-press solidifying: thin material heat-insulation pressure keeping 200 ~ 2000s under temperature 130 ~ 180 DEG C, pressure 0.3 ~ 10Mpa condition is obtained the slice-type friction materials precast body of curing molding;
Step 6, thermal treatment: the slice-type friction materials precast body of curing molding is placed in baking oven thermal treatment at thermograde 80 ~ 100 DEG C-110 ~ 130 DEG C-150 ~ 180 DEG C, the soaking time in each stage is 50 ~ 70min, 80 ~ 100min, 120 ~ 140min respectively, finally obtains wet fiber and strengthens resin-matrix friction material.
Described staple fibre is any one of vegetable fibre, mineral fibre, glass fibre, carbon fiber, ceramic fiber, titanate whisker, inorganic calcium salt whisker or silicon carbide whisker or appoints several.
Described frictional property regulator is any one of aluminum oxide, zirconium silicate, feldspar, chromite, fluorite, silicon carbide, silicon nitride, graphite or molybdenumdisulphide or appoints several.
Described frictional property regulator powder granularity is 80 ~ 400 orders.
Described filler is any one of cashew nut shell oil Frication powder, vermiculite, barite, diatomite, calcium carbonate, kaolin, barium sulfate, mica or black rubber powder or appoints several.
Described filler powder granularity is 80 ~ 600 orders.
Described resin glue is resol, cashew nut oil modified alkyd resin or paracril change surname resol any one or appoint several.
The invention has the beneficial effects as follows: after staple fibre, frictional property regulator and filler are passed through dry method batch mixing by the method, in kneader device, add liquid binder resin solution mediate, wherein in liquid-containing binder, the massfraction of resin is 40 ~ 70%, until kneading evenly and after keeping certain viscosity, it is the slice-type material of 0.4 ~ 2.5mm that half dry state starting material after kneading are added thin-pass to thickness in extrusion equipment, dry, again by the slice-type material curing molding in hot-press equipment after oven dry, obtain wet fiber and strengthen resin-matrix friction material.The whole preparation process water consumption of this preparation method is 0, and organic solvent usage quantity saves 45 ~ 90% than background technology, and technical process is simultaneously reduced to 6 steps by 12 steps, saves mass energy.
Below in conjunction with the drawings and specific embodiments, the present invention is elaborated.
Accompanying drawing explanation
Fig. 1 is the photo that wet fiber of the present invention strengthens the wet fiber enhancing resin-matrix friction material of preparation method's embodiment 1 preparation of resin-matrix friction material.
Embodiment
Embodiment 1:
(1) staple fibre 2.6kg is altogether taken, be respectively xylon 0.5kg, calcium sulfate crystal whiskers 0.8kg, carbon fiber 1.3kg, take frictional property regulator 3.5kg altogether, graphite 0.8kg, feldspar 1.2kg, Fluorspar Powder 1.5kg, take filler 9.3kg altogether, diatomite 2kg, ground barium sulfate 3.0kg, cashew nut shell oil Frication powder 4.5kg, join in high speed mixer successively by taken powderous primary material, opening device batch mixing;
(2) until all raw material mixing after, be transferred in kneader device, opening device, gradation add phenolic resin content be 40% resol-ethanolic soln 5.3kg repeatedly mediate;
(3) mediate evenly to all material, be laid on two roller rolling equipment ingress, draw slice-type material in outlet, thickness is 0.4mm;
(4) slice-type material is placed in dry place to dry after 1 day, stamping-out obtains required slice-type friction materials precast body;
(5) slice-type friction materials precast body is put into plate hot-press equipment, 130 DEG C, hot-press solidifying 200s is shaping under 0.3MPa;
(6) the slice-type friction materials precast body after hot-press solidifying is placed in baking oven, under 80 DEG C of-110 DEG C of-150 DEG C of thermogrades, is incubated 50min, 80min, 120min respectively heat-treats, obtain final friction materials.
As can be seen from Figure 1, it is slice-type that wet fiber prepared by the present embodiment strengthens resin-matrix friction material, homogeneous.
Embodiment 2:
(1) staple fibre 4kg is altogether taken, be respectively xylon 0.5kg, glass fibre 1.5kg, non-asbestos mineral fibre 2kg, take frictional property regulator 2kg altogether, be respectively graphite 0.3kg, chromite powder 0.5kg, Fluorspar Powder 1.2kg, take filler 10kg altogether, be respectively ground barium sulfate 3kg, diatomite 7kg, taken powderous primary material is joined in high speed mixer successively, opening device batch mixing;
(2) until all raw material mixing after, be transferred in kneader device, opening device, gradation add phenolic resin content be 50% resol-ethanolic soln 8kg repeatedly mediate;
(3) mediate evenly to all material, be laid on two roller rolling equipment ingress, draw slice-type material in outlet, thickness is 0.8mm;
(4) slice-type material is placed in dry place to dry after 2 days, stamping-out obtains required slice-type friction materials precast body;
(5) slice-type friction materials precast body is put into plate hot-press equipment, 140 DEG C, hot-press solidifying 500s is shaping under 2MPa;
(6) the slice-type friction materials precast body after hot-press solidifying is placed in baking oven, under 85 DEG C of-110 DEG C of-160 DEG C of thermogrades, is incubated 60min, 80min, 130min respectively heat-treats, obtain final friction materials.
Embodiment 3:
(1) staple fibre 6.7kg is altogether taken, be respectively flaxen fiber 1kg, glass fibre 2.2kg, non-asbestos mineral fibre 3.5kg, take frictional property regulator 1.3kg altogether, be respectively aluminum oxide 0.3kg, graphite 0.5kg, molybdenumdisulphide 0.5kg, take filler 11kg altogether, be respectively diatomite 3.0kg, ground barium sulfate 3.0kg, cashew nut shell oil Frication powder 5kg, taken powderous primary material is joined in high speed mixer successively, opening device batch mixing;
(2) until all raw material mixing after, be transferred in kneader device, opening device, gradation add phenolic resin content be 60% resol-ethanolic soln 10kg repeatedly mediate;
(3) mediate evenly to all material, be laid on two roller rolling equipment ingress, draw slice-type material in outlet, thickness is 1.5mm;
(4) slice-type material is placed in dry place to dry after 2 days, stamping-out obtains required slice-type friction materials precast body;
(5) slice-type friction materials precast body is put into plate hot-press equipment, 150 DEG C, hot-press solidifying 1000s is shaping under 6MPa;
(6) the slice-type friction materials precast body after hot-press solidifying is placed in baking oven, under 90 DEG C of-120 DEG C of-165 DEG C of thermogrades, is incubated 60min, 90min, 130min respectively heat-treats, obtain final friction materials.
Embodiment 4:
(1) staple fibre 9.5kg is altogether taken, be respectively flaxen fiber 1.5kg, carbon fiber 3.0kg, glass fibre 5.0kg, take frictional property regulator 4.0kg altogether, graphite 0.8kg, aluminum oxide 0.8kg, silicon carbide 2.4kg, take filler 5.5kg altogether, diatomite 1.0kg, ground barium sulfate 2.0kg, cashew nut shell oil Frication powder 2.5kg, join in high speed mixer successively by taken powderous primary material, opening device batch mixing;
(2) until all raw material mixing after, be transferred in kneader device, opening device, gradation add phenolic resin content be 70% resol-ethanolic soln 11.4kg repeatedly mediate;
(3) mediate evenly to all material, be laid on two roller rolling equipment ingress, draw slice-type material in outlet, thickness is 2.0mm;
(4) slice-type material is placed in dry place to dry after 3 days, stamping-out obtains required slice-type friction materials precast body;
(5) slice-type friction materials precast body is put into plate hot-press equipment, 160 DEG C, hot-press solidifying 1500s is shaping under 8MPa;
(6) the slice-type friction materials precast body after hot-press solidifying is placed in baking oven, under 100 DEG C of-120 DEG C of-170 DEG C of thermogrades, is incubated 65min, 95min, 130min respectively heat-treats, obtain final friction materials.
Embodiment 5:
(1) staple fibre 4.3kg is altogether taken, be respectively flaxen fiber 1.0kg, carbon fiber 1.5kg, potassium titanate crystal whisker 1.8kg, take frictional property regulator 4.1kg altogether, graphite 0.5kg, molybdenumdisulphide 1kg, aluminum oxide 2.6kg, take filler 1.4kg altogether, cashew nut shell oil Frication powder 1.4kg, joins in high speed mixer successively by taken powderous primary material, opening device batch mixing;
(2) until all raw material mixing after, be transferred in kneader device, opening device, gradation add phenolic resin content be 40% resol-ethanolic soln 9.6kg repeatedly mediate;
(3) mediate evenly to all material, be laid on two roller rolling equipment ingress, draw slice-type material in outlet, thickness is 2.5mm;
(4) slice-type material is placed in dry place to dry after 4 days, stamping-out obtains required slice-type friction materials precast body;
(5) slice-type friction materials precast body is put into plate hot-press equipment, 180 DEG C, hot-press solidifying 2000s is shaping under 10MPa;
Slice-type friction materials precast body after hot-press solidifying is placed in baking oven, under 100 DEG C of-130 DEG C of-180 DEG C of thermogrades, is incubated 70min, 100min, 140min respectively heat-treats, obtain final friction materials.
Described staple fibre is any one of vegetable fibre, mineral fibre, glass fibre, carbon fiber, ceramic fiber, titanate whisker, inorganic calcium salt whisker or silicon carbide whisker or appoints several.
Described frictional property regulator is any one of aluminum oxide, zirconium silicate, feldspar, chromite, fluorite, silicon carbide, silicon nitride, graphite or molybdenumdisulphide or appoints several.
Described frictional property regulator powder granularity is 80 ~ 400 orders.
Described filler is any one of cashew nut shell oil Frication powder, vermiculite, barite, diatomite, calcium carbonate, kaolin, barium sulfate, mica or black rubber powder or appoints several.
Described filler powder granularity is 80 ~ 600 orders.
Described resin glue is resol, cashew nut oil modified alkyd resin or paracril change surname resol any one or appoint several.
Described dry method batch mixing is a kind of high-speed agitating process, is joined successively in high speed mixer by the starting material not containing resol in proportion, is stirred to described starting material and mixes.
Described semidrying mediate be by dry mixed after starting material mix by a certain percentage with liquid binder resin solution, repeatedly mediate in containing the container of kneader, until starting material mix with liquid binder resin solution, and material is made to obtain the strength of materials required in thin-pass process and ductility; In order to obtain desirable strength and ductility, the mass ratio of resin solution and solid powder is 40 ~ 70%.
Described thin-pass refers to that a kind of extrusion equipment put into by the starting material after semidrying being mediated, starting material are added from ingress, and starting material are drawn by exit after equipment extruding, form complete slice-type material, extrusion equipment is two roller or multiple roll rolling equipment, and extrusion process can repeat.
Described hot-press solidifying be by thin-pass after slice-type material be placed among dull and stereotyped frock, apply certain pressure and temperature, and pressurize certain hour, make resin glue generation condensation reaction connect into tridimensional network.
The inventive method production process is without water, 1,000 ten thousand paper friction materials calculating are produced by annual, decrease organic solvent usage quantity, eliminate precast body drying process when paper process produces paper friction material and the energy expenditure of dry organic solvent process, shorten Production Flow Chart, low production cost.
Described fiber reinforced resin based Wet-type friction material compares paper friction material, 1,000 ten thousand friction materialss calculating are produced by annual, production technique water consumption is 0 ton, saving water resource 14685 tons/year, organic solvent usage quantity is few, saves organic solvent 34.8 tons/year, save high cost and environmental issue that the precast body drying process of paper friction material and wastewater treatment bring, production technique is reduced to 6 steps by 12 steps, and Production Flow Chart almost decreases half, estimates saves energy 2.8 × 10
5in degree/year, the mass industrialized production cost implementing friction materials is significantly reduced.
Claims (3)
1. wet fiber strengthens a preparation method for resin-matrix friction material, it is characterized in that comprising the following steps:
Step one, dry method batch mixing: be the staple fibre of 15 ~ 35% by mass percentage, mass percentage be 5 ~ 30% frictional property regulator and mass percentage be the filler of 20 ~ 55%, first mixed by dry method high-speed stirring, make mixed dry material;
Step 2, semidrying mediate: by mass percentage be 10 ~ 30% resin glue be made into the resin solution that massfraction is 40 ~ 70%, mediate with mixed dry material the leather hard friction materials obtaining mixing through semidrying;
Step 3, thin-pass: make its thin-pass to desired thickness 0.4 ~ 2.5mm by extruding leather hard friction materials, obtain slice-type material;
Step 4, drying and stamping-out: slice-type material is placed in drying and locates to dry for 1 ~ 4 day, stamping-out obtains required slice-type friction materials precast body;
Step 5, hot-press solidifying: thin material heat-insulation pressure keeping 200 ~ 2000s under temperature 130 ~ 180 DEG C, pressure 0.3 ~ 10Mpa condition is obtained the slice-type friction materials precast body of curing molding;
Step 6, thermal treatment: the slice-type friction materials precast body of curing molding is placed in baking oven thermal treatment at thermograde 80 ~ 100 DEG C-110 ~ 130 DEG C-150 ~ 180 DEG C, the soaking time in each stage is 50 ~ 70min, 80 ~ 100min, 120 ~ 140min respectively, finally obtains wet fiber and strengthens resin-matrix friction material;
Described staple fibre is any one of vegetable fibre, mineral fibre, glass fibre, carbon fiber, ceramic fiber, titanate whisker, inorganic calcium salt whisker or silicon carbide whisker or appoints several;
Described frictional property regulator is any one of aluminum oxide, zirconium silicate, feldspar, chromite, fluorite, silicon carbide, silicon nitride, graphite or molybdenumdisulphide or appoints several;
Described filler is any one of cashew nut shell oil Frication powder, vermiculite, barite, diatomite, calcium carbonate, kaolin, barium sulfate, mica or black rubber powder or appoints several;
Described resin glue is resol, cashew nut oil modified alkyd resin or paracril change surname resol any one or appoint several.
2. wet fiber according to claim 1 strengthens the preparation method of resin-matrix friction material, it is characterized in that: described frictional property regulator powder granularity is 80 ~ 400 orders.
3. wet fiber according to claim 1 strengthens the preparation method of resin-matrix friction material, it is characterized in that: described filler powder granularity is 80 ~ 600 orders.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106118483A (en) * | 2016-07-18 | 2016-11-16 | 张和庆 | Under a kind of low temperature environment, clutch surface sheet stock is with soaking coating processed |
| CN107163913A (en) * | 2017-06-12 | 2017-09-15 | 太仓捷公精密金属材料有限公司 | It is a kind of with phenolic resin modified metal-free ceramic friction material |
| CN108050183A (en) * | 2017-12-12 | 2018-05-18 | 北京启顺京腾科技有限责任公司 | A kind of friction material and its locomotive brake shoe of preparation |
| CN109555802A (en) * | 2018-11-08 | 2019-04-02 | 北京天仁道和新材料有限公司 | A kind of friction material, wear-resistant coating brake disc prepared therefrom are made pottery brake block and its preparation method and application with organic carbon |
| CN110259859A (en) * | 2019-06-03 | 2019-09-20 | 山西中聚晶科半导体有限公司 | A kind of brake block and preparation method thereof using sapphire preparation |
| CN112943815A (en) * | 2021-02-03 | 2021-06-11 | 王之革 | Mechanical clutch friction plate and production process thereof |
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| CN1814657A (en) * | 2005-02-02 | 2006-08-09 | 中南大学 | Environment-protection type high-performance automobile braking piece and making method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106118483A (en) * | 2016-07-18 | 2016-11-16 | 张和庆 | Under a kind of low temperature environment, clutch surface sheet stock is with soaking coating processed |
| CN107163913A (en) * | 2017-06-12 | 2017-09-15 | 太仓捷公精密金属材料有限公司 | It is a kind of with phenolic resin modified metal-free ceramic friction material |
| CN108050183A (en) * | 2017-12-12 | 2018-05-18 | 北京启顺京腾科技有限责任公司 | A kind of friction material and its locomotive brake shoe of preparation |
| CN109555802A (en) * | 2018-11-08 | 2019-04-02 | 北京天仁道和新材料有限公司 | A kind of friction material, wear-resistant coating brake disc prepared therefrom are made pottery brake block and its preparation method and application with organic carbon |
| CN110259859A (en) * | 2019-06-03 | 2019-09-20 | 山西中聚晶科半导体有限公司 | A kind of brake block and preparation method thereof using sapphire preparation |
| CN112943815A (en) * | 2021-02-03 | 2021-06-11 | 王之革 | Mechanical clutch friction plate and production process thereof |
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| Publication number | Publication date |
|---|---|
| CN105566842B (en) | 2018-04-06 |
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