CN1670113A - Friction material for vehicles without asbestos and metal - Google Patents
Friction material for vehicles without asbestos and metal Download PDFInfo
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- CN1670113A CN1670113A CN 200510018519 CN200510018519A CN1670113A CN 1670113 A CN1670113 A CN 1670113A CN 200510018519 CN200510018519 CN 200510018519 CN 200510018519 A CN200510018519 A CN 200510018519A CN 1670113 A CN1670113 A CN 1670113A
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Abstract
The invention relates to a non-asbestos and metal-free vehicular friction material, the percentage by weight is: 15~25% fibrous material, 4~10% binding agent, 18~25% ceramic material, 12~18% lubricating agent and marginal filling materials, the material are composition of heavy spar, dolomite, sodium fluoride, friction powder, vermiculite and oil coke powder. The non-asbestos and metal-free vehicular friction material is manufactured through mixing, coining, heat treating and after treatment. The invention meets the requirement of the braking operation mode of the modern vehicles.
Description
Technical field
The present invention relates to friction materials, particularly a kind of friction material for vehicles without asbestos and metal.
Background technology
The development of friction materials closely links to each other with the development of automobile industry all the time, has the history in over one hundred year so far, and in the development course in over one hundred year, the asbestos base product is always in occupation of consequence.From nineteen seventies, after industry flourishing state in west proposed the hazardness problem of asbestos to human body, the manufacturing no asbestos motion of friction materials was at first risen in American-European countries.The metal fibre of the semi-metallic based friction material that is born the 1980s has substituted fibrous magnesium silicate and has been popularized rapidly, so far the half of the country in the friction materials market share in the world still.But physics, the chemical property index of fibrous magnesium silicate and steel fiber (mainly referring to steel fiber) exist huge difference, and this also just will inevitably cause the frictional behaviour of two series products and other physical and mechanical properties that very big difference is arranged.
Fibrous magnesium silicate is divided into chrysotile and dodges the keratite asbestoid, and use in the Industrial products field is essentially chrysotile.This material has very high tensile strength, good mechanical property and resistance to elevated temperatures, and cheap, is widely used in fields such as building materials, fire-fighting and friction materials.After entering nineteen seventies, asbestos are limited gradually in Hesperian range of application, the eighties, the asbestos use that is under an embargo in the friction materials product.As the skeleton strongthener in the friction materials, abandon asbestos and just must find other alternative fiber.At first the semimetal friction material that is generalizable in western countries has substituted fibrous magnesium silicate with steel fiber, but the existence of a large amount of metal ingredients in this class material prescription structure has caused the existence of defectives such as product hardness height, thermal conductivity height, easy-to-rust.And a series of problems such as the potential safety hazard that may cause, comfortableness difference that have of these defectives, what is more important: semi-metallic can not adapt to the new technical feature requirement that the Hyundai Motor breaking system proposes friction materials.For satisfying the service requirements of new automobile breaking system, European countries have developed the friction product of few metal construction in the nineties, this series products has overcome some critical defects of semi-metal product, but prior achievement is, the research staff has therefrom drawn: the metal content in the friction materials is low more, and the The comprehensive performance index just more helps satisfying the service requirements of Hyundai Motor damped condition.Europe is defined as no asbestos metal-free friction material: asbestos content is zero, metal content 0-10%.Japan is similar with Europe to the definition of this series products, distinguishes to be: the fine content of steel is zero, allows to exist the non-ferrous metal of 0-10%.
Europe and Japan have represented the most advanced level of world's friction material field substantially in the research level of friction material field.High-performance does not have the direction that the asbestos metal-free friction material also is present world wide friction materials technical research.
Summary of the invention
Problem to be solved by this invention is: a kind of no asbestos metal-free friction material is provided, it can satisfy the Hyundai Motor breaking system particularly anti-lock brake system-ABS system to the high performance requirements of friction materials.
The technical solution adopted in the present invention is: friction material for vehicles without asbestos and metal comprises following component, and its weight percent is: filamentary material 15～25, tackiness agent 4～10, ceramic-like materials 18～25, lubricant 12～18, filler surplus.Filler is the mixture of barite, rhombspar, Sodium Fluoride, friction powder, vermiculite and refinery coke carbon dust.
The preparation method of friction material for vehicles without asbestos and metal is: make friction material for vehicles without asbestos and metal by mixing, mold pressing, thermal treatment, aftertreatment technology.Concrete preparation method may further comprise the steps:
Batching: take by weighing raw material according to weight percent, these raw materials are filamentary material 15～25, tackiness agent 4～10, ceramic-like materials 18～25, lubricant 12～18, filler surplus.Filler is the mixture of barite, rhombspar, Sodium Fluoride, friction powder, vermiculite and refinery coke carbon dust.
Mix: the raw material after the weighing preparation is poured in the pears rake formula mixer that has the high speed reamer,, got pulverulent mixture through 20～30 minutes mix.
Mold pressing: pulverulent mixture dropped into carry out mold pressing in the fluid pressure type shaper, make pulverulent mixture in thermoset mold, be pressed once shaped according to solidifying pressing process, perhaps post forming, promptly, put into thermoset mold afterwards and be cured compression moulding earlier with pulverulent mixture pre-molding blank.Obtain moulding product after the depanning cooling.
Solidifying pressing process is: 150～180 ℃ of temperature, pressure 140～200kg.f/cm
2, 5～8 minutes press times, 3 minutes every exhaust in 10～20 seconds once.
Thermal treatment: moulding product is put into baking oven carry out 8～10 hours oven dry, bake out temperature is 150～260 ℃.
Postprocessing working procedures: the product after will drying is made friction material for vehicles without asbestos and metal by ground finish, spray paint processing and annex assembly process.
The present invention is based on that it contains in forming can synergistic multiple organic and inorganic materials, and does not have asbestos and do not have metal, and promptly asbestos, metal content are zero, so following major advantage is arranged:
One. the detection through country non-mineral products quality supervision and test center identifies that this product has unique rubbing characteristics, is applicable to the manufacturing of automotive brake liner.Every performance index are asked for an interview table 2 and the table 3 that is positioned at the article end.
They are two years old. because multiple organic and inorganic materials is scientific and reasonable is used, make this product eliminate brake oil and heat fading, improve product work-ing life, and the aspects such as adhesion interlock that overcome between friction pair have superiority.
They are three years old. can satisfy the service requirements of Hyundai Motor damped condition, particularly particular requirement such as the smaller the better and small construction damping of anti-lock brake system-ABS system high compression coefficient of elasticity, quality (density) that friction materials is proposed.
They are four years old. and technology is simple, is suitable for suitability for industrialized production, and is nuisanceless, has tangible economic and social benefit.
Embodiment
The present invention is a kind of friction material for vehicles without asbestos and metal, is applicable to the manufacturing of automotive brake liner, contains materials such as carbon fiber, aramid fiber, ceramic fiber, vermiculite in the finished product, and asbestos, metal content were zero during prescription was formed.
The invention will be further described below in conjunction with embodiment.
One. friction material for vehicles without asbestos and metal
1. friction material for vehicles without asbestos and metal comprises following component (seeing Table 1), and its weight percent is: filamentary material 15～25, tackiness agent 4～10, ceramic-like materials 18～25, lubricant 12～18, filler surplus.
Above-mentioned filler is the mixture of barite, rhombspar, Sodium Fluoride, friction powder, vermiculite and refinery coke carbon dust.
2. by weight,
Filamentary material comprises: aramid fiber 1～3, ceramic fiber 8～11, carbon fiber 3～5, wollastonite fibre 3～8.It mainly plays and increases the effect of rubbing.
Tackiness agent comprises: the fine modified resin 3～9 of fourth, and in the butadiene acrylonitrile rubber powder 0.5～3.It mainly plays bonding toughening effect.
Ceramic-like materials comprises: aluminium sesquioxide 1～3, pure aluminium silicate 3～6, zircon 5～10, green silicon carbide 0.3～1.It mainly plays and increases the effect of rubbing.
Lubricant comprises: graphite 8～13, molybdenumdisulphide 2～5.It plays the antifriction lubrication.
Filler comprises: barite 13～30, rhombspar 5～10, Sodium Fluoride 1～3, friction powder 3～8, vermiculite 6～10, refinery coke carbon dust 5～11.It can play effect stable and adjusting product frictional coefficient.
Two. the preparation method of friction material for vehicles without asbestos and metal
Friction material for vehicles without asbestos and metal is made by technologies such as mixing, mold pressing, thermal treatment, aftertreatments.
Concrete preparation method may further comprise the steps:
Batching: the weight percent according to aforementioned regulation takes by weighing filamentary material, tackiness agent, ceramic-like materials, lubricant and filler, and filler is the mixture of barite, rhombspar, Sodium Fluoride, friction powder, vermiculite and refinery coke carbon dust.
Mix: the raw material after the weighing preparation is poured in the pears rake formula mixer that mixer for example has the high speed reamer, through 20～30 minutes mix, pulverulent mixture.
Mold pressing:, determine the curing pressing process that constitutes by press temperature, time, pressure according to the product thickness area.
Pulverulent mixture dropped into carry out once shaped or post forming mold pressing in the fluid pressure type shaper, make it in mould, be pressed into product with definite shape, intensity, density; Obtain moulding product after the depanning cooling, its density is 2.2～2.5g/cm3.Secondary forming process promptly earlier with pulverulent mixture pre-molding blank, is put into thermoset mold afterwards and is cured compression moulding.In order to obtain under high temperature, highly compressed effect, making friction materials for good and all to be bonded at moulding product on the steel backing, should be before mold pressing procedure, earlier to steel backing clean, ball blast, caking agent be coated.Solidifying pressing process is: 150～180 ℃ of temperature, pressure 140～200kg.f/cm
2, 5～8 minutes press times, 3 minutes every exhaust in 10～20 seconds once.
Thermal treatment: finish chemistry, physical reaction more fully for making in the component various materials, the moulding product that obtains after the depanning cooling should be put into Equipment for Heating Processing and heat-treat, Equipment for Heating Processing can be the electrically heated baking oven, also can be Oil fuel dry box.
The heat treatment process parameter suggestion is: dried 150～260 ℃ of temperature 8～10 hours.
Temperature rise rate suggestion is: high temperature to 150 ℃ 1 hour, 150～180 ℃ 1 hour, 180～190 ℃ 2 hours, 190～200 ℃ 2 hours, 200 ℃ 2 hours.
Thermal treatment is the critical process that influences the product frictional behaviour.The processing condition of solidifying compacting and heat treatment step can be adjusted as required flexibly, but these adjustment might have influence on the final friction and wear behavior of product and some other indexs.
Postprocessing working procedures: the product after thermal treatment is finished is still work in-process, also need pass through ground finish afterwards, spray paint and handle and postprocessing working procedures such as annex assembling, make friction material for vehicles without asbestos and metal, it can be made into frictional coefficient be about 0.42 for example as the friction materials product of brake facing friction work.Postprocessing working procedures does not influence the frictional behaviour of friction materials of the present invention, only geometrical dimension of product etc. is processed, but and do not mean that these operations are inessential, opposite, even Properties of Friction Materials is good again, the product size precision does not reach requirement and can not entrucking use yet.
This technology is simple, has so just guaranteed that the present invention can successfully carry out suitability for industrialized production under the prerequisite of not carrying out high investment.The crucial part of present technique is exactly to carry out accurate dosing according to the proportion requirement of prescription, in view of each the fiber material composition that contains in the batching, for guaranteeing various types of materials mixing and stirring fully, should at first carry out shredding to each fibrid and handle, the high speed reamer in the plough type mixer can be realized this operation.This technology is dry technology for production, and the end adds the solvent material of liquid in the compound.
This product identified by the detection at national non-mineral products quality supervision and test center that the non-quality inspection of state (rubbing) word (05024) survey report and other index correlation data saw table 2, table 3 for details already.
Table 2 has shown according to GB5763-1998 and has carried out the constant speed test for data.It shows: product stable friction factor, hot stage μ value obtain strengthening, no decay.Restorability is good, and wear rate is better than GB and surpasses similar imported product.
In table 3 data, the Rockwell hardness of product of the present invention, density, cold reduction index improve significantly than traditional product.It shows: aspect eliminating brake oil, improving product comfort, product of the present invention is better than traditional product.And the improvement of thermal conductivity has guaranteed that brake circuit is not vaporized under the high-temperature brake operating mode, thereby has guaranteed the usefulness in high-temperature brake stage.The reduction of coefficient of thermal expansion can overcome braking and separate halfway phenomenon.Comprehensive above data, the present invention does not have the asbestos metal-free friction material can satisfy the service requirements of Hyundai Motor damped condition fully, and is better than traditional product.
Three. subordinate list
Table 1: the component of friction material for vehicles without asbestos and metal and weight percent thereof
Table 2: carry out the constant speed test for data according to GB5763-1998
| Temperature | ?100℃ | ?150℃ | ?200℃ | ?250℃ | ?300℃ | ?350℃ |
| Intensification μ | ?0.43 | ?0.49 | ?0.49 | ?0.45 | ?0.48 | ?0.50 |
| Cooling μ | ?0.43 | ?0.46 | ?0.49 | ?0.49 | ?0.52 | |
| Wear rate | ?0.12 | ?0.19 | ?0.26 | ?0.38 | ?0.37 | ?0.31 |
Table 3: physical and mechanical properties achievement data contrast
Claims (10)
1. a friction material for vehicles without asbestos and metal is characterized in that comprising following component, and its weight percent is: filamentary material 15～25, and tackiness agent 4～10, ceramic-like materials 18～25, lubricant 12～18, the filler surplus,
Above-mentioned filler is the mixture of barite, rhombspar, Sodium Fluoride, friction powder, vermiculite and refinery coke carbon dust.
2. friction material for vehicles without asbestos and metal according to claim 1 is characterized in that by weight, and filamentary material comprises following component: aramid fiber 1～3, ceramic fiber 8～11, carbon fiber 3～5, wollastonite fibre 3～8.
3. friction material for vehicles without asbestos and metal according to claim 1 is characterized in that by weight, and tackiness agent comprises following component: the fine modified resin 3～9 of fourth, butadiene acrylonitrile rubber powder 0.5～3.
4. friction material for vehicles without asbestos and metal according to claim 1 is characterized in that by weight, and ceramic-like materials comprises following component: aluminium sesquioxide 1～3, pure aluminium silicate 3～6, zircon 5～10, green silicon carbide 0.3～1.
5. friction material for vehicles without asbestos and metal according to claim 1 is characterized in that by weight, and lubricant comprises following component: graphite 8～13, molybdenumdisulphide 2～5.
6. friction material for vehicles without asbestos and metal according to claim 1 is characterized in that by weight, and filler comprises following component: barite 13～30, rhombspar 5～10, Sodium Fluoride 1～3, friction powder 3～8, vermiculite 6～10, refinery coke carbon dust 5～11.
7. the preparation method of a friction material for vehicles without asbestos and metal is characterized in that making friction material for vehicles without asbestos and metal by mixing, mold pressing, thermal treatment, aftertreatment technology, and concrete preparation method may further comprise the steps:
Batching: take by weighing raw material according to weight percent, these raw materials are filamentary material 15～25, tackiness agent 4～10, ceramic-like materials 18～25, lubricant 12～18, filler surplus, filler is the mixture of barite, rhombspar, Sodium Fluoride, friction powder, vermiculite and refinery coke carbon dust
Mix: the raw material after the weighing preparation is poured in the pears rake formula mixer that has the high speed reamer,, got pulverulent mixture through 20～30 minutes mix,
Mold pressing: pulverulent mixture dropped into carry out mold pressing in the fluid pressure type shaper, make pulverulent mixture in thermoset mold, be pressed once shaped according to solidifying pressing process, perhaps post forming, promptly, put into thermoset mold afterwards and be cured compression moulding earlier with pulverulent mixture pre-molding blank; Obtain moulding product after the depanning cooling,
Solidifying pressing process is: 150～180 ℃ of temperature, pressure 140～200kg.f/cm
2, 5～8 minutes press times, 3 minutes are every exhaust in 10～20 seconds once,
Thermal treatment: moulding product is put into baking oven carry out 8～10 hours oven dry, bake out temperature is 150～260 ℃,
Postprocessing working procedures: the product after will drying is made friction material for vehicles without asbestos and metal by ground finish, spray paint processing and annex assembly process.
8. the preparation method of friction material for vehicles without asbestos and metal according to claim 7, it is characterized in that in mold pressing procedure, earlier to steel backing clean, ball blast, caking agent be coated, then pulverulent mixture is dropped into and carry out mold pressing in the fluid pressure type shaper, make pulverulent mixture in thermoset mold, be pressed once shaped according to solidifying pressing process, perhaps post forming promptly earlier with pulverulent mixture pre-molding blank, is put into thermoset mold afterwards and is cured compression moulding; Obtain being bonded at the moulding product on the steel backing after the depanning cooling.
9. according to the preparation method of claim 7 or 8 described friction material for vehicles without asbestos and metal, it is characterized in that the moulding product that obtains after the depanning cooling, its density is 2.2～2.5g/cm
3
10. the preparation method of friction material for vehicles without asbestos and metal according to claim 7 is characterized in that by weight,
Filamentary material comprises following component: aramid fiber 1～3, and ceramic fiber 8～11, carbon fiber 3～5, wollastonite fibre 3～8,
Tackiness agent comprises following component: the fine modified resin 3～9 of fourth, and in the butadiene acrylonitrile rubber powder 0.5～3,
Ceramic-like materials comprises following component: aluminium sesquioxide 1～3, and pure aluminium silicate 3～6, zircon 5～10, green silicon carbide 0.3～1,
Lubricant comprises following component: graphite 8～13, and molybdenumdisulphide 2～5,
Ceramic-like materials comprises following component: barite 13～30, and rhombspar 5～10, Sodium Fluoride 1～3, friction powder 3～8, refinery coke carbon dust 5～11,
Filler comprises following component: barite 13～30, rhombspar 5～10, Sodium Fluoride 1～3, friction powder 3～8, vermiculite 6～10, refinery coke carbon dust 5～11.
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| Publication number | Publication date |
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| CN100424120C (en) | 2008-10-08 |
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