CN102350498B - C/C composite material brake pad and manufacturing method thereof - Google Patents
C/C composite material brake pad and manufacturing method thereof Download PDFInfo
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- CN102350498B CN102350498B CN 201110282878 CN201110282878A CN102350498B CN 102350498 B CN102350498 B CN 102350498B CN 201110282878 CN201110282878 CN 201110282878 CN 201110282878 A CN201110282878 A CN 201110282878A CN 102350498 B CN102350498 B CN 102350498B
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Abstract
The invention relates to the technical field of a brake pad, and particularly discloses a C/C composite material brake pad and a manufacturing method thereof. The C/C composite material brake pad is characterized in that a substrate material of the brake pad comprises the following components in percentage by weight: 50%-65% of short carbon fibers, 10%-25% of graphite, 5%-15% of pitches, 5%-10% of copper powder and 5%-10% of titanium powder. The manufacturing method has the beneficial effects: on the one hand, a hot-pressing sintering process is adopted to prepare a C/C composite material, pressurizing and sintering are integrated and the process is simple; on the other hand, copper and titanium are alloyed during a sintering process, thereby reducing a sintering temperature and improving a friction performance; the titanium powder is added and reacts with C so as to generate TiC, thereby promoting a frictional factor; the copper powder is uniformly scattered in the composite material, thereby promoting a cooling rate; and the graphite is taken as a lubrication component, for protecting a dual disk and stabilizing the frictional factor. The brake pad produced according to the manufacturing method has little abrasion to the dual disk and is stable in frictional factor.
Description
(1) technical field
The present invention relates to the brake block technical field, particularly a kind of C/C composite material brake block and preparation method thereof.
(2) background technology
Brake block also is brake rubber block, is the breaking piece of most critical, and the quality of all braking effects all is that brake block plays a decisive role.Development along with society, the raising of living standards of the people, the speed of racing car, sedan limousine is also improving constantly, and is also more and more higher to the high-speed and high-temperature performance requirement of brake block, so a kind ofly satisfy stable friction factor under the high-speed and high-temperature, noise brake block low, that comfortableness is good and demand listing urgently.
(3) summary of the invention
The present invention is in order to remedy the deficiencies in the prior art, provides that a kind of noise is low, high temperature resistant, the C/C composite material brake block of stable friction factor and preparation method thereof.
The present invention is achieved through the following technical solutions:
A kind of C/C composite material brake block is characterized in that: the liner material of brake block comprises the component of following percentage by weight: short carbon fiber 50%-65%, graphite 10%-25%, pitch 5%-15%, copper powder 5%-10%, titanium valve 5%-10%.
This C/C composite material brake block, its preferred scheme is: the liner material of brake block comprises the component of following percentage by weight: short carbon fiber 50%-60%, graphite 12%-20%, pitch 8%-15%, copper powder 6%-8%, titanium valve 5%-8%.
The granularity of this each material of brake block liner is respectively: graphite 200-220 order, short carbon fiber 500-1000 micron (length), pitch 180-250 order, copper powder 200-250 order, titanium valve 180-200 order.
The granularity preferred version of this each material of brake block liner is: graphite 200 orders, short carbon fiber 700 microns (length), pitch 200 orders, copper powder 220 orders, titanium valve 200 orders.
The preparation method of this C/C composite material brake block is characterized in that: comprise the steps:
(1) prepare the brake block liner with hot pressing sintering method:
(1-1) raw material is mixed: take by weighing the dusty material of brake block by proportioning, put into mortar and be mixed evenly;
(1-2) Thermocompressed sintering and forming: with the above-mentioned powder stock that the mixes graphite jig of packing into, it is hot-forming to put into the hot-pressed sintering furnace sintering, and sintering temperature is 1200 ℃, and sintering time is 5h;
(2) liner is combined with backboard: after the above-mentioned liner for preparing and backboard are sintered together with phenol-formaldehyde resin modified again riveted joint reinforce and get final product.
Hot pressed sintering is for to carry out under vacuum state in the step (1-2).
The beneficial effect of C/C composite material brake block of the present invention and preparation method thereof is: be to prepare the C/C composite with hot pressing sintering method on the one hand, collection pressurizes and is sintered in one, and technique is simple; Be to add copper, titanium alloying in sintering process on the other hand, reduce sintering temperature, improve frictional behaviour; Add the TiC raising coefficient of friction that titanium valve and C reaction generates; Add the copper powder uniformly dispersing in composite, improve rate of heat dispation; With graphite as lubricant component; protect antithesis, stablize coefficient of friction; the brake block of producing thus is little to the wearing and tearing of antithesis dish; stable friction factor, the requirement that inordinate wear, noise probability of occurrence are little, high temperature resistant, environmental protection, braking ability all can be satisfied high speed performance brake block (such as racing car, sedan limousine brake block).
(4) specific embodiment
Brake pad material provided by the invention be with graphite as matrix material, short carbon fiber is as reinforcing material, with copper, titanium as alloying material.In the hot pressed sintering process, insulation 40min in the time of 350 ℃, this moment asphalt carbonization, it is in fact the pyrolytic process of pitch, 400 ℃ of the cleavage of the volatilization of need experience low molecular compound, polymerisation, molecular structure and rearrangement (＜400 ℃), nucleation and growths (〉), and some chemical processes are finished subsequently, just generate at last carbon matrix.1100 ℃ of insulation 30min fully reflect C and Ti, Cu and Ti, and the TiC of generation and copper titanium compound serve as transition zone, are wrapped in around carbon fiber or the graphite, and copper is evenly distributed, and fully are scattered in the composite.Adding copper is because copper has relatively low fusing point, fully fills the space of graphite and carbon fiber in the sintering process under the effect of alloy Ti, improves the compactness of abrasive material, and the manufacturability of sintering is better; Copper has high thermal conductivity, has guaranteed well heat radiation in friction process; Copper has preferably plasticity, is easy to compacting.Add titanium and generate TiC except playing transition zone, also because it has high strength, high rigidity, can strengthen the anti-wear performance of brake block, improve coefficient of friction.Described antifriction material is mainly graphite, because graphite has layer structure, can effectively reduce coefficient of friction, can play good anti-attrition effect in friction process, also can reduce the wearing and tearing of brake block simultaneously, protects antithesis, stablizes coefficient of friction.The brake block of producing thus is little to the wearing and tearing of antithesis dish, stable friction factor, the requirement that inordinate wear, noise probability of occurrence are little, environmental protection, braking ability all can be satisfied racing car high-performance brake block.
The preparation method of C/C composite material brake block provided by the invention comprises the steps:
Batch mixing:
, pour in the mortar and stir according to formulation ratio by automatic batching system or manual operations various raw material that the friction surface of brake block is required.The friction material that stirs is put into graphite jig, mould is put into hot-pressed sintering furnace again, sintering under vacuum atmosphere processes the brake block liner.
After the above-mentioned liner for preparing and backboard be sintered together with phenol-formaldehyde resin modified again riveted joint reinforce.
Hot pressed sintering:
Mold pressing divides weighing and two steps of sintering compacting to carry out.
Weighing: according to various raw materials and the weight that compacted products needs, weighing friction material on electronic platform scale.The complete friction material of weighing is put into check weighing on the checking weight weigh, and the friction material that guarantees to use is in the weight range of " standard value ± 1g ".
Compacting: the mould that raw material will be housed is put into hot-pressed sintering furnace, is 20MPa according to the pressing process system pressure of stipulating, insulation 40min in the time of 350 ℃, and 1100 ℃ of insulation 30min, sintering under vacuum atmosphere, sintering temperature is up to 1200 ℃.
Grinding:
Use modular grinding machine processing friction material surface, make friction material surface reach certain thickness, the depth of parallelism, flatness requirement; Use fluting, grind oblique machine, by slotted wheel saw blade or cup emery wheel, the surface of processing friction material processes groove or inclined-plane.
Removing surface:
Divide polishing and two steps of sandblast to carry out.First on polishing machine, by wire wheel, the burr of cleaning brake block steel back periphery, flash, overlap etc.; On sand-blasting machine, by brown corundum abrasive, the dirt above the cleaning brake block steel back, corrosion etc. are in order to guarantee the quality requirement of postorder processing again.
Spraying:
The product that removing surface is complete, according to client's requirement, with the powder of different colours, different brightness cover above the brake block steel back, side and friction material side.Product is by drying oven, through states such as melting, smooth and level, curing, reaches certain adhesive force requirement.
Beat code:
Use ink jet numbering machine and ink special, on the steel backing surface, vibration damping sheet is surperficial or the friction material side, the different clients' of spray printing different information and the processing lot number of product are so that product reviewing after selling.
Installation accessories:
Install and fix noise reduction, warning device at brake block steel back.
Packing:
With the finished product brake block, use sealing machine, thermal contraction machine, mounted box after shrinking by plastic uptake film vacuum, or use skin packaging machine, by fit film product and cardboard vacuum are pasted the jail.
Below in conjunction with specific embodiment C/C composite material brake block provided by the present invention and preparation method thereof is described in further detail.
Embodiment 1:
Get respectively short carbon fiber 50g, graphite 15g, pitch 15g, copper powder 10g, titanium valve 10g, granularity is respectively: graphite 200 orders, 700 microns of short carbon fibers, pitch 200 orders, copper powder 220 orders, titanium valve 200 orders, load weighted raw material is put into mortar stir, put into graphite jig, put at last hot-pressed sintering furnace at the vacuum atmosphere hot pressed sintering, pressure is 20MPa, insulation 40min in the time of 350 ℃, 1100 ℃ of insulation 30min, sintering temperature is up to 1200 ℃.Liner behind the sintering is sintered together with polyamide modified phenolic resins and backboard, and sintering temperature is 150 ℃, and riveted joint is reinforced again at last, obtains brake block.When temperature was higher than 700 ℃, the heat fading phenomenon was not obvious, and braking ability is stable, and noise less than 7%, is zero during greater than 80db during greater than 70db; The coefficient of friction excursion is little, 0.38＜μ＜0.42, and wear rate is 0.38 * 10
4Mg/Nm.
Embodiment 2:
Get respectively short carbon fiber 65g, graphite 20g, pitch 5g, copper powder 5g, titanium valve 5g, granularity is respectively: graphite 220 orders, 1000 microns of short carbon fibers, pitch 250 orders, copper powder 250 orders, titanium valve 190 orders, load weighted raw material is put into mortar stir, put into graphite jig, put at last hot-pressed sintering furnace at the vacuum atmosphere hot pressed sintering, pressure is 20MPa, insulation 40min in the time of 350 ℃, 1100 ℃ of insulation 30min, sintering temperature is up to 1200 ℃.Liner behind the sintering is sintered together with epoxy modified phenolic resin and backboard, and sintering temperature is 150 ℃, and riveted joint is reinforced again at last, obtains brake block.When temperature was higher than 700 ℃, the heat fading phenomenon was not obvious, and braking ability is stable, and noise less than 6%, is zero during greater than 80db during greater than 70db; The coefficient of friction excursion is little, 0.39＜μ＜0.42, and wear rate is 0.37 * 10
4Mg/Nm.
Embodiment 3:
Get respectively short carbon fiber 63g, graphite 10g, pitch 12g, copper powder 8g, titanium valve 7g, granularity is respectively: graphite 210 orders, 500 microns of short carbon fibers, pitch 180 orders, copper powder 200 orders, titanium valve 180 orders, load weighted raw material is put into mortar stir, put into graphite jig, put at last hot-pressed sintering furnace at the vacuum atmosphere hot pressed sintering, pressure is 20MPa, insulation 40min in the time of 350 ℃, 1100 ℃ of insulation 30min, sintering temperature is up to 1200 ℃.Liner behind the sintering is sintered together with boron modified phenolic resin and backboard, and sintering temperature is 150 ℃, and riveted joint is reinforced again at last, obtains brake block.When temperature was higher than 700 ℃, the heat fading phenomenon was not obvious, and braking ability is stable, and noise less than 5%, is zero during greater than 80db during greater than 70db; The coefficient of friction excursion is little, 0.37＜μ＜0.41, and wear rate is 0.37 * 10
4Mg/Nm.
Embodiment 4:
Get respectively short carbon fiber 55g, graphite 25g, pitch 6g, copper powder 6g, titanium valve 8g, granularity is respectively: graphite 200 orders, 800 microns of short carbon fibers, pitch 220 orders, copper powder 230 orders, titanium valve 200 orders, load weighted raw material is put into mortar stir, put into graphite jig, put at last hot-pressed sintering furnace at the vacuum atmosphere hot pressed sintering, pressure is 20MPa, insulation 40min in the time of 350 ℃, 1100 ℃ of insulation 30min, sintering temperature is up to 1200 ℃.Liner behind the sintering is sintered together with dimethylbenzene phenol-formaldehyde resin modified and backboard, and sintering temperature is 150 ℃, and riveted joint is reinforced again at last, obtains brake block.When temperature was higher than 700 ℃, the heat fading phenomenon was not obvious, and braking ability is stable, and noise less than 9%, is zero during greater than 80db during greater than 70db; The coefficient of friction excursion is little, 0.35＜μ＜0.44, and wear rate is 0.43 * 10
4Mg/Nm.
Embodiment 5:
C/C composite of the present invention is the brake material that can become the alternative metals based composites because having a series of mechanics, calorifics and fretting wear, and its main feature is as follows:
A) density is little, and the density of C/C composite is 1/3 to 1/4 of metal-base composites density;
B) Heat stability is good surpasses more than 2000 ℃ in temperature, and the C/C composite neither can bond vitrified, can buckling deformation yet, can continue after the cooling to use; And the temperature of metal-base composites causes bond vitrified above producing buckling deformation more than 660 ℃, and the brake block that therefore adopts the C/C composite to make had both improved the design margin of brake assemblies, has also improved the safety in utilization of brake assemblies;
C) specific heat capacity is large, and the specific heat capacity of this material is 2.5 times of metal-base composites, has excellent heat absorption function, has improved the radiating efficiency of brake block, and the heat fading performance is excellent;
D) stable friction factor, wear rate is low, long service life;
E) specific strength is high, and especially elevated temperature strength approximately is more than 2 times of steel, compares with metal-base composites, this material self can be used as structural detail, do not need other material to make framework supporting structure, simplified the structure of brake assemblies, improved reliability and the maintenanceability of brake assemblies.
Claims (6)
1. C/C composite material brake block, it is characterized in that: the liner material of brake block comprises the component of following percentage by weight: short carbon fiber 50%-65%, graphite 10%-25%, pitch 5%-15%, copper powder 5%-10%, titanium valve 5%-10%.
2. C/C composite material brake block according to claim 1, it is characterized in that: the liner material of brake block comprises the component of following percentage by weight: short carbon fiber 50%-60%, graphite 12%-20%, pitch 8%-15%, copper powder 6%-8%, titanium valve 5%-8%.
3. C/C composite material brake block according to claim 1 and 2, it is characterized in that: the granularity of this each material of brake block liner is respectively: graphite 200-220 order, short carbon fiber 500-1000 micron, pitch 180-250 order, copper powder 200-250 order, titanium valve 180-200 order.
4. C/C composite material brake block according to claim 3, it is characterized in that: the granularity of this each material of brake block liner is respectively: graphite 200 orders, 700 microns of short carbon fibers, pitch 200 orders, copper powder 220 orders, titanium valve 200 orders.
5. the preparation method of a C/C composite material brake block claimed in claim 1 is characterized in that: comprise the steps:
(1) prepare the brake block liner with hot pressing sintering method:
(1-1) raw material is mixed: take by weighing the dusty material of brake block liner by proportioning, put into mortar and be mixed evenly;
(1-2) Thermocompressed sintering and forming: with the above-mentioned powder stock that the mixes graphite jig of packing into, it is hot-forming to put into the hot-pressed sintering furnace sintering, and sintering temperature is 1200 ℃, and sintering time is 5h;
(2) liner is combined with backboard: after the above-mentioned liner for preparing and backboard are sintered together with phenol-formaldehyde resin modified again riveted joint reinforce and get final product.
6. the preparation method of C/C composite material brake block according to claim 5 is characterized in that: hot pressed sintering is for to carry out under vacuum state in the step (1-2).
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| CN 201110282878 CN102350498B (en) | 2011-09-22 | 2011-09-22 | C/C composite material brake pad and manufacturing method thereof |
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| CN 201110282878 CN102350498B (en) | 2011-09-22 | 2011-09-22 | C/C composite material brake pad and manufacturing method thereof |
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| CN104353825A (en) * | 2014-10-22 | 2015-02-18 | 苏州莱特复合材料有限公司 | Magnesium matrix composite and preparation method thereof |
| CN108018506B (en) * | 2017-12-08 | 2019-04-09 | 湖南中南智造新材料协同创新有限公司 | A kind of modified height of short carbon fiber rubs composite material and preparation method and application |
| CN110670003A (en) * | 2019-09-30 | 2020-01-10 | 山东隆基机械股份有限公司 | Mineral material reinforced aluminum-based brake disc and production process thereof |
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| RU2294942C1 (en) * | 2005-10-24 | 2007-03-10 | Валерий Васильевич Кулаков | Method of manufacture of the frictional article |
| JP2008025018A (en) * | 2006-06-22 | 2008-02-07 | Akebono Brake Ind Co Ltd | Sintering friction material |
| CN101165819A (en) * | 2007-09-13 | 2008-04-23 | 北京航空航天大学 | Preparation process of carbon base sliding block material for track vehicle |
| CN101571173B (en) * | 2009-06-16 | 2011-01-05 | 博深工具股份有限公司 | Brake block for high-speed train and preparation method thereof |
| CN101812648A (en) * | 2010-03-16 | 2010-08-25 | 大连三木得科技有限公司 | Carbon fiber retainer composite material capable of substituting traditional bearing |
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Address after: 253600 Shandong city of Dezhou province Leling city Xicheng District high tech Industrial Park Applicant after: Shandong Gold Phoenix Co., Ltd. Address before: 253600 Shandong city of Dezhou province Leling city Xicheng District high tech Industrial Park Applicant before: Shandong Gold Phoenix Group Co., Ltd. |
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