CN102391834A - Preparation method for high temperature-resistant automobile brake lining - Google Patents
Preparation method for high temperature-resistant automobile brake lining Download PDFInfo
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- CN102391834A CN102391834A CN2011102792567A CN201110279256A CN102391834A CN 102391834 A CN102391834 A CN 102391834A CN 2011102792567 A CN2011102792567 A CN 2011102792567A CN 201110279256 A CN201110279256 A CN 201110279256A CN 102391834 A CN102391834 A CN 102391834A
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Abstract
The invention provides a preparation method for a high temperature-resistant automobile brake lining. Eutectic salt/magnesia-alumina spinel phase-change materials are prepared by high-temperature sintering, and are mixed with organic binder, reinforcements, friction performance regulators and other fillers to prepare friction materials, the organic binder is phenolic resin, the reinforcements are inorganic fibers and cellulose fibers, the friction performance regulators are graphite, molybdenum disulfide and alumina, and the fillers are pulverized coal, wollastonite powder and barite. The preparation process flow is as follows: material preprocessing, batching, mixing, prepressing, hot embossing, heat treatment, machining and finished product. The high temperature-resistant automobile brake lining has the advantages of stable friction coefficient, good heat fading resistance and low wear rate, and moreover, the materials are cheap, so that the production cost can be greatly reduced.
Description
Technical field
The present invention relates to a kind of preparation method of high temperature resistant vehicle brake lining, belong to the composite friction material technical field.
Background technology
Along with the progress of auto technology, the speed of automobile is more and more faster, and stopper is more and more littler, and to the demands for higher performance of friction materials, working conditions is also more harsh.The automotive friction material is the critical material in automotive brake, clutch coupling and the friction gear, and it is converted into the energy of heat energy and other form with the kinetic energy of motor racing, thereby makes automobile brake.Therefore, its performance direct relation reliability of system operation and stability.Along with the Hyundai Motor industrial expansion, also increasingly high to the performance requriements of friction materials, for example enough and stable frictional coefficient to be arranged; The difference of dynamic and static frictional coefficient is little, and good thermal conductivity, bigger thermal capacity and certain high temperature physical strength arranged, and good wear resistance and block resistance arranged; Be difficult for the scratch mating plate; Noiseless, cost is low, environmentally safe etc.
Friction materials mostly with resol as resin matrix, make various fortifying fibres and other component be bonded to friction materials product with the required various performances of friction catch.Matrix resin has a very important role to whole material property.But defectives such as the resol that uses in the friction materials now exists, and fragility is big, poor toughness, modulus is high, hardness is high, cohesive force is little, water-intake rate is high, shrinking percentage is big, poor thermal conductivity, thermotolerance are limited affect the performance of brake facing greatly.Thereby, must especially improve its thermotolerance to phenolic resin modified; To satisfy the demand of novel automobile brake facing, the disclosed rubber modified resin base frication material of publication number CN 101186709A, stable friction factor; Product abrasion is little; The heat fading rate has clear improvement, and is lower than 20%, and adopts the heat fading of pure phenolic resin product up to more than 35% in the comparison sample.The disclosed a kind of interpolation nano modification resin brake facing preparation method of publication number CN 1908038A has improved the heat fading and the hot restorability of friction materials.The report that also has boron, benzoxazine, organosilicon, polyimide modified resol in addition, but resol belongs to organism, and high-temperature resistant result is still undesirable.
Summary of the invention
The purpose of this invention is to provide a kind of high temperature resistant friction materials and working method thereof.In friction materials, add phase change material, utilize latent heat of phase change to absorb the heat of friction that produces in the braking procedure, thereby reduce the heat fading of friction materials, improve the performance of friction materials.
Technical scheme of the present invention is: adopt high-temperature sintering process to prepare salt eutectic phase-change material; Again itself and organic binder bond, fortifying fibre, frictional property regulator and other several kinds of fillers are mixed with friction materials, preparation process is: preparation phase change material-raw materials pretreatment-batching-mixing-precompressed-hot-forming-thermal treatment-machining-finished product.
A kind of high temperature resistant friction materials mainly is made up of organic binder bond, phase change material, fortifying fibre, frictional property regulator and other several kinds of fillers, and its basic recipe is following:
(1) resol: 10%～20%
(2) phase change material: 20%～50%
(3) inorganic fibre: 10%～20%
(4) cellulosic fibre: 1%～2%
(5) graphite: 8%～12%
(6) molybdenumdisulphide: 0.5%～2%
(7) aluminum oxide: 1%～3%
(8) flyash: 20%～30%
(9) wollastonite powder: 5%～10%
(10) permanent white: total amount is filled to 100%.
Each component raw material is carried out weighing according to above-mentioned basic recipe with mass percent, in high-speed mixer, stirs 30min, and it is hot-forming to place mould to carry out the raw material that mixes, and moulding product thermal treatment 12h in the blowing-type loft drier gets product.
The present invention compares with existing friction materials, has the following advantages:
1, the eutectic salts for preparing among the present invention/magnesium-aluminium spinel phase change material; Eutectic salts is distributed in the micron order ultra micro network of ceramic body; After temperature reached the salt eutectic phase-change temperature, the eutectic salts fusing absorbed the latent heat of phase change fusing, but because the capillary tension of micropore; Fused salt can not flow out, and has solved the problem that phase change material is revealed easily.
2, the brake lining of adding phase change material has higher thermostability, i.e. heat resistanceheat resistant decline is functional, and has lower wear rate.The high temperature resistant vehicle brake lining of the present invention's preparation is carried out the friction and wear behavior test under 350 ℃, its frictional coefficient and wear rate all are superior to the requirement of standard GB 5763-1998.In addition, the adding of inorganic fibre has also improved the high-temperature mechanical property of friction materials greatly.
3, raw materials cost is low, adopts flyash as constituent materials among the present invention, and add-on is 20%～30%, and its price is about 70 yuan/ton, far below the price of other common friction material constituents, thereby can significantly reduce the cost of friction materials.
Embodiment
The present invention provides a kind of preparation method of high temperature resistant vehicle brake lining; It is by organic binder bond: resol; Strengthen body: inorganic fibre and cellulosic fibre; Frictional property regulator: graphite, molybdenumdisulphide, aluminum oxide, self-control phase change material and other several kinds of fillers: flyash, wollastonite powder tiff are formed, and each component percentage composition sum of said friction materials is 100%.
The preparation method of a kind of high-temperature resistant braking liner provided by the invention may further comprise the steps:
1, the preparation of phase change material.With Natural manganese dioxide and the aluminum oxide mol ratio proportioning by 1: 1, phase change material is with NaNO
3-NaCl-Na
2CO
3According to certain mass ratio (lowest total of the melting point occurring) proportioning, the mass ratio of phase change material and ceramic matrix 4: 6.With the even sample of afterwards processing φ 36mm * 36mm of various raw materials mix, dry 12h under 110 ℃ at the 150MPa forming under the pressure.Made sample sintering in high-temperature electric resistance furnace rises to 1000 ℃ with the heat-up rate of 5 ℃/min from room temperature, and insulation 3h promptly obtains the ceramic base phase change material behind the naturally cooling, promptly can be used as a kind of filler of friction materials after phase change material is pulverized.
2, raw materials pretreatment.With the prescription in inorganic component (like flyash; Deng) under whipped state, spray into silane coupling agent prehydrolysis solution (additional proportion is m (coupling agent): m (fiber/flyash)=1: 10 with vaporific; The prehydrolysis ratio m (ethanol) of silane coupling agent: m (coupling agent)=1: 5); Coupling agent all adds continued and stirred 15 minutes, with promptly getting silane coupler modified raw material behind the raw material stoving removal solvent that fully soaks into.
3, mix stirring.Each component raw material by after the proportioning weighing, is added and fully stirs 30min in the high-speed mixer, obtain the mixed uniformly raw material of each component.
4, hot-forming.With above-mentioned compound add mould under 180 ℃ ± 5 ℃ temperature and the pressure of 30MPa, carry out hot-forming, hot pressing dwell time 10min, preceding 5 minutes domestic demand breathing a moulds of pressurize 2～3 times.
5, thermal treatment.Product after hot-forming is put into the blowing-type loft drier, slowly be warmed up to 180 ℃, insulation 12h heat-treats, and promptly obtains the friction materials finished product.
Below be the preparing method's of a kind of high temperature resistant vehicle brake lining of the present invention specific embodiment part:
With 15% resol as sticker; In friction material formulation, add 45% self-control phase change material; Simultaneously with 1% molybdenumdisulphide, 9% graphite and 3% aluminum oxide as frictional property regulator; And total amount is filled to 100% by other several kinds of fortifying fibres and filler, make the high temperature resistant vehicle brake lining according to the method described above.According to the method among the standard GB 5763-1998, material is carried out the friction and wear behavior test, test result is following.
Test result
Visible according to above instance, this high temperature resistant vehicle brake lining has higher, more stable frictional coefficient, less character of heat-fading and wear resistance preferably, and safe reliability is high, and noise hangs down and does not damage the antithesis element.Because its raw material and production technique cost are low, have high cost performance, it is widely used becomes possibility.
Claims (6)
1. the preparation method of a high temperature resistant vehicle brake lining is characterized in that comprising the component of following quality percentage composition:
(1) resol: 10%～20%
(2) phase change material: 20%～50%
(3) inorganic fibre: 10%～20%
(4) cellulosic fibre: 1%～2%
(5) graphite: 8%～12%
(6) molybdenumdisulphide: 0.5%～2%
(7) aluminum oxide: 1%～3%
(8) flyash: 20%～30%
(9) wollastonite powder: 5%～10%
(10) permanent white: total amount is filled to 100%.
2. the preparation method of the described a kind of high temperature resistant vehicle brake lining of claim 1; It is characterized in that the preparation method comprises the steps: that component raw material carries out weighing according to the prescription that is provided in the claim 1 with mass percent; Raw material is stirred 30min in high-speed mixer; Obtain compound, press the required weighing of goods specification, place mould hot-forming under the pressure of 165～170 ℃ temperature and 30MPa; Dwell time is 8～10min, and moulding product gets product in 180 ℃ of following thermal treatment 12h in the blowing-type loft drier.
3. the preparation method of the described a kind of high temperature resistant vehicle brake lining of claim 2 is characterized in that having the inorganic salt composite phase-change material in the prescription, utilizes latent heat of phase change to absorb the heat of friction in the braking procedure, reduces the heat fading of brake lining.
4. the described inorganic salt composite phase-change material of claim 3 is characterized in that with aluminum oxide and Natural manganese dioxide be the ceramic matrix raw material, mixes with eutectic salts, prepares eutectic salts/magnesium-aluminium spinel composite phase-change material through high temperature sintering.
5. the described eutectic salts of claim 4 is characterized in that it being by NaNO
3As matrix and Na
2CO
3, NaCl, Na
2SO
4, K
2CO
3, a kind of or two kinds of compositions among the KCl, six kinds of inorganic salt of LiCl the eutectic salts system, eutectic salts system transformation temperature is 270～300 ℃, latent heat of phase change is greater than 160J/g.
6. high temperature resistant vehicle brake lining, the content that it is characterized in that the inorganic salt composite phase-change material is 20%～50%.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102635653A (en) * | 2012-04-13 | 2012-08-15 | 济南金麒麟刹车系统有限公司 | Multielement resin base carbon compound disc-type braking pad and preparation method thereof |
| CN103484061A (en) * | 2013-07-24 | 2014-01-01 | 盐城工学院 | Phase-change alloy powder-doped resin-based friction material |
| CN104762569A (en) * | 2015-03-23 | 2015-07-08 | 蚌埠南自仪表有限公司 | Fly ash aluminium-based composite material with high fatigue strength and preparation method thereof |
| CN104762570A (en) * | 2015-03-23 | 2015-07-08 | 蚌埠南自仪表有限公司 | Fly ash aluminium-based composite material with good corrosion resistance and preparation method thereof |
| CN104762571A (en) * | 2015-03-23 | 2015-07-08 | 蚌埠市鸿安精密机械有限公司 | Fly ash aluminium-based composite material with good anti-breaking property and preparation method thereof |
| CN104762506A (en) * | 2015-03-23 | 2015-07-08 | 蚌埠南自仪表有限公司 | Super wear resistant fly ash aluminium-based composite material and preparation method thereof |
| CN104762502A (en) * | 2015-03-23 | 2015-07-08 | 蚌埠南自仪表有限公司 | Impact-resistant fly ash aluminium-based composite material with high hardness and preparation method thereof |
| CN109400030A (en) * | 2018-12-20 | 2019-03-01 | 兰州新生科技有限责任公司 | High temperature resistant geo-polymer based composites and preparation method thereof for brake block |
| CN110724498A (en) * | 2019-09-27 | 2020-01-24 | 天津科技大学 | High-performance medium-high temperature sodium-based phase change energy storage material and preparation method thereof |
| CN112961456A (en) * | 2021-04-13 | 2021-06-15 | 北京纵横机电科技有限公司 | Friction regulator composition and preparation method and application thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102635653A (en) * | 2012-04-13 | 2012-08-15 | 济南金麒麟刹车系统有限公司 | Multielement resin base carbon compound disc-type braking pad and preparation method thereof |
| CN103484061A (en) * | 2013-07-24 | 2014-01-01 | 盐城工学院 | Phase-change alloy powder-doped resin-based friction material |
| CN103484061B (en) * | 2013-07-24 | 2015-04-22 | 盐城工学院 | Phase-change alloy powder-doped resin-based friction material |
| CN104762569A (en) * | 2015-03-23 | 2015-07-08 | 蚌埠南自仪表有限公司 | Fly ash aluminium-based composite material with high fatigue strength and preparation method thereof |
| CN104762570A (en) * | 2015-03-23 | 2015-07-08 | 蚌埠南自仪表有限公司 | Fly ash aluminium-based composite material with good corrosion resistance and preparation method thereof |
| CN104762571A (en) * | 2015-03-23 | 2015-07-08 | 蚌埠市鸿安精密机械有限公司 | Fly ash aluminium-based composite material with good anti-breaking property and preparation method thereof |
| CN104762506A (en) * | 2015-03-23 | 2015-07-08 | 蚌埠南自仪表有限公司 | Super wear resistant fly ash aluminium-based composite material and preparation method thereof |
| CN104762502A (en) * | 2015-03-23 | 2015-07-08 | 蚌埠南自仪表有限公司 | Impact-resistant fly ash aluminium-based composite material with high hardness and preparation method thereof |
| CN109400030A (en) * | 2018-12-20 | 2019-03-01 | 兰州新生科技有限责任公司 | High temperature resistant geo-polymer based composites and preparation method thereof for brake block |
| CN110724498A (en) * | 2019-09-27 | 2020-01-24 | 天津科技大学 | High-performance medium-high temperature sodium-based phase change energy storage material and preparation method thereof |
| CN112961456A (en) * | 2021-04-13 | 2021-06-15 | 北京纵横机电科技有限公司 | Friction regulator composition and preparation method and application thereof |
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Application publication date: 20120328 |