CN103436222A - Preparation method for lanthanide modified brake pad of mining truck - Google Patents

Abstract

The invention discloses a preparation method for a lanthanide modified brake pad of a mining truck. The brake pad is prepared through taking lanthanide oxides, reinforcing fibers, binding agent, conditioning agent and filling powder as the principle additive raw materials and adopting the procedures of mixing, cold pressing, hot pressing and heat treatment for modification. The product prepared through the method has the advantages of high temperature resistance, good heat fading performance, stable friction coefficient, excellent braking performance, good abrasion resistance, long service life, low braking noise, and good conformance to environmental protection requirements, and can completely satisfy the specific requirements of high deadweight tonnage, large braking torque, high braking frequency and great calorific value for the mining truck.

Description

A kind of preparation method of mine truck brake facing of lanthanon modification

Technical field

The invention belongs to the preparing technical field of friction materials, be specifically related to a kind of preparation method who utilizes the mine truck brake facing of lanthanon modification.

Background technology

Automobile brake sheet is made as base material heating with cotton and leather at first, but, due to poor heat resistance, braking effect is bad, and is replaced by the asbestos friction material brake facing.It is found that asbestos material is a kind of strong carcinogenic industrial raw material the sixties in 20th century, people also recognize the hazardness of asbestos to human health gradually, and the asbestos material brake facing also just is forced to exit the arena of history thereupon.The multiple friction materials brake facings such as semi-metal, powder metallurgy, carbon fiber, ceramic fiber are developed in home and abroad in succession, due to its good performance, and obtain on-highway motor vehicle, use in a large number, for certain contribution has been made in the development of automobile cause.

Friction materials can be divided into by the product material:

(1) semimetal friction material, be mainly used in the disc brake pad of car and heavy-duty car, it is a kind of non-asbestos friction material grown up for replacing asbestos the earliest, be characterized in that thermotolerance is better, the unit surface absorption power is high, thermal conductivity is large, basically can be applicable to automobile at a high speed, damped condition requirement during heavy service, but the shortcoming such as it exists that brake noise is large, corner embrittlement, braking effect are not good.

(2) powder metallurgy friction material, claim again sintered friction material, system by iron-based, copper original washing powder shape material, through mixing, compacting, and at high temperature sintering forms, be applicable to braking and transmission condition condition under comparatively high temps, such as the braking of aircraft, heavy-load automobile, heavy engineering machinery and transmission etc.

(3) carbon fiber friction material, be to be the class friction materials that strongthener is made with carbon fiber, and carbon fiber has the characteristics such as the high amount of rubbing, heat conduction be good, heat-resisting.Carbon fiber friction material is that all kinds friction materials performance is a kind of preferably, and therefore high the and light specific gravity of the unit surface absorption power of carbon fiber friction disk is particularly suitable for producing the aircraft brake sheet.

(4) ceramic fiber friction materials, be to be the class friction materials that strongthener is made with ceramic fiber, has good anti-aging, low wearing and tearing and the characteristics such as frictional behaviour of high-temperature stable.

(5) conjugated fibre type friction materials is to do base material with two or more fiber, through specific technique, it is mixed.Mainly take inorganic fibre as main, sometimes also add a small amount of organic fibre.Usually brake facing is chopped strand type friction plate, and clutch disc is continuous fibre type friction plate.

Mine truck, due to the specified conditions that its weight-carrying capacity is large, working condition severe, the braking number of times is frequent, thermal value is large, the short-term operation temperature reaches more than 500 ℃, and when long, working temperature is 200 ℃～300 ℃, and operating pressure is 2MPa ~ 3MPa.For the specific operation condition of mine truck operation, the weak point of traditional non-asbestos brake lining is as follows:

Heat fading

The matrix of traditional non-asbestos friction material (being binding agent) is heat-reactive phenolic resin and rubber, when the process of mine truck operation, friction materials is in braking and transmission process, the friction surface of it and metal pairs can produce very high temperature, reach 200 ~ 400 ℃, even higher, this temperature has reached the heat decomposition temperature of resin and rubber.Macromole in resin and rubber is due to the lower-molecular substance of thermal destruction generation liquid state or gaseous state, form very thin liquid state or the gaseous medium layer of one deck on friction surface, make originally to become for the working condition of pure friction or metal to-metal contact the situation of mixed friction, be reflected as the decline of frictional coefficient or sharply descend on macroscopic view, this is called heat fading.

Thermal wear and heat crack

Friction materials when the worst hot case condition, causes the aggravation of resin and rubber macromolecule thermolysis for a long time, the molecular backbone chain of polymkeric substance and cross linked chain fracture, and reticulated structure is destroyed, and lower-molecular substance produces and overflows.The result of thermolysis makes resin and rubber carbonization and loses weight.Carbonization makes resin lose cohesive action, owing to losing weight, binding agent quantity is reduced, and causes Friction Disk Surface gradually to form be full of cracks, and the wearing and tearing aggravation, even can cause material to come off from friction material surface sometimes, loses work functions.

Contrast disclosed patent application (application number: 00134952.X) on July 17th, 2002, although its performance is better than traditional non-asbestos brake lining to a certain extent, but contained rare earth kind is numerous and diverse, comprise rare-earth mineral, mixed rare earth compound and single rare earth compound, the element kind varies especially, comprises lanthanum to 18 rare earth elements such as yttriums.Most of rare earths belong to mineral intergrowth, and usually association has the natural radioactive element such as uranium, thorium, to yard in one's power surrounding environment pollute.Simultaneously, being not all rare earth element plays a role improving the brake facing aspect of performance, therefore is necessary required rare earth element and kind in the rare earth brake facing are screened and studied.

Summary of the invention

The objective of the invention is for the problems referred to above, a kind of preparation method of mine truck brake facing of lanthanon modification is provided, the present invention is after the friction materials technical characterstic effect of the existing brake facing of analysis-by-synthesis, found out the preparation method of a kind of effective formula and brake facing, adopt present method can stablize the brake facing frictional coefficient, reduce wear rate, the noise while reducing brake, extend the work-ing life of brake facing, the phenomenon of reduce that lamella comes off, fragmentation and retarding disc being pulled.

A kind of preparation method of mine truck brake facing of lanthanon modification, it is characterized in that, take lanthanide oxide, fortifying fibre, binding agent, conditioning agent and filling powder as adding raw material, adopt batch mixing, cold pressing and hot pressing, and carry out modification through Overheating Treatment and make; Wherein, lanthanide oxide comprises lanthanum trioxide, cerium oxide, Praseodymium trioxide, Neodymium trioxide; Fortifying fibre comprises ceramic fiber, soft steel fiber, chrome molybdenum fiber, electrolysis red copper fiber; Binding agent comprises acrylonitrile butadiene rubber modified resol, antimony sulfide, glass putty, sulphur; Conditioning agent comprises zircon sand, corundum, without magnetic brown iron oxide, refinery coke carbon dust; Fill powder and comprise graphite, ground barium sulfate, mica, silicon carbide, norbide; The weight of this formula of take is benchmark, and the formula per-cent of various raw materials is as follows:

Lanthanide oxide: lanthanum trioxide 0.1-5%, cerium oxide 0.1-5%, Praseodymium trioxide 0.05-2%, Neodymium trioxide 0.05-2%,

Fortifying fibre: ceramic fiber 8-16%, soft steel fiber 18-23%, chrome molybdenum fiber 5-13%, electrolysis red copper fiber 3-10%,

Binding agent: acrylonitrile butadiene rubber modified resol 9-15%, antimony sulfide 1-4%, glass putty 1-4%, sulphur 1-4%,

Conditioning agent: zircon sand 2-5%, corundum 3-10%, without magnetic brown iron oxide 4-9%, refinery coke carbon dust 5-16%,

Fill powder: graphite 3-10%, ground barium sulfate 3-8%, mica 1-4%, silicon carbide 2-8%, norbide 2-10%;

The raw material taken is in proportion mixed, during batch mixing, added absolute ethyl alcohol and stirring; At first add lanthanide oxide and binding agent is mixed and modified, and then other raw material stirring of adding except binding agent are prepared; The batch mixing process is carried out in middle vacuum, and vacuum tightness is at-0.1 ~ 0.1Mpa; Carry out coldmoulding between 0.3MPa ~ 0.6MPa, duration is 20 ~ 30 seconds; Then carry out hot-formingly, pressure is 20MPa ~ 25MPa, and temperature is 150 ℃ ~ 180 ℃, and the press time is 20min; The brake facing made the most at last carries out postorder thermal treatment, thermal treatment temp is controlled as follows: room temperature to 160 ℃ is 2 hours, 160 ℃ are incubated 2 hours, and 160 ℃ ~ 180 ℃ is 1 hour, and 180 ℃ are incubated 1 hour, 180 ℃ ~ 200 ℃ is 1 hour, 200 ℃ are incubated 1 hour, and 200 ℃ ~ 220 ℃ is 1 hour, and 220 ℃ are incubated 4 hours, 220 ℃ to room temperature, naturally cooling.

As innovative point of the present invention, the oxide compound that we adopt lanthanum (La), cerium (Ce), praseodymium (Pr), four kinds of rare earth elements of neodymium (Nd) is as one of important component of mine truck brake facing formula.This group material has outstanding chemically reactive and excellent interface performance, can significantly improve high temperature friction, the high-temperature wear behavior of friction materials.In this simultaneously, be directed to the application of multiple rare earth element in friction materials, we are eliminated the false and retained the true, and remove crudely and store essence, and under the prerequisite of the energy that effectively economizes on resources, have avoided the pollution of environment.

The effect of invention

Formula of the present invention, due to after adding lanthanon, can play the effect of two aspects, and the one, can be changed performance to binding agent, make it can be high temperature resistant, improve the heat fading performance; The 2nd, can reduce wear rate, reduce noise.

The present invention is owing to taking above composition and engineering, and the overall product of making has the following advantages and positive effect:

(1) do not contain asbestos, brake noiselessness, conform with environmental protection requirement;

(2) high temperature resistant, the heat fading performance is good, can not form the gel layer, lamella difficult drop-off or fragmentation, frictional coefficient reaches requirement and stable, good, the practical driving safety that ensured of braking ability;

(3) wear resisting property is good, is greater than 3.5 ten thousand kilometers work-ing life;

(4) the mechanics decline, do not occur in rust corrosion not in moist, sour gas environment;

(5) the dual face wearing and tearing are little relatively, can not cause damage to brake drum and retarding disc, are applicable to the various braking modes of large-tonnage mine truck.

Embodiment

Below in conjunction with embodiment, the present invention is described in detail.

Exemplifying embodiment 1 and test-results

The weight of this formula of take is benchmark, and the formula per-cent of various raw materials is as follows:

Lanthanide oxide: lanthanum trioxide 0.1%, cerium oxide 5%, Praseodymium trioxide 0.05%, Neodymium trioxide 2%,

Fortifying fibre: ceramic fiber 8%, soft steel fiber 23%, chrome molybdenum fiber 5%, electrolysis red copper fiber 10%;

Binding agent: acrylonitrile butadiene rubber modified resol 9%, antimony sulfide 1%, glass putty 4%, sulphur 1%;

Conditioning agent: zircon sand 2%, corundum 3%, without magnetic brown iron oxide 4.85%, refinery coke carbon dust 5%;

Fill powder: graphite 3%, ground barium sulfate 3%, mica 1%, silicon carbide 8%, norbide 2%.

The raw material taken is in proportion mixed, during batch mixing, adopt the plough type mixing machine to mix, added the absolute ethyl alcohol and stirring that concentration is 99% (v/v); At first add lanthanide oxide and binding agent is mixed and modified, and then other raw material stirring of adding except binding agent are prepared; Increase evacuation process in the batch mixing program, the vacuum tightness that guarantees this operation is at-0.1MPa.Then carry out coldmoulding, mixed raw material is put into to the die cavity of mould, select the press of 500 tons, pressure is arranged between 0.6MPa and carries out coldmoulding simultaneously, and duration is 20 seconds.Then carry out hot-formingly, pressure is 20MPa, and temperature is 150 ℃, and the press time is 20min.The brake facing made the most at last carries out postorder thermal treatment, and by fixture on hot-forming product clip, the product that then will press from both sides fixture is placed among baking oven, Temperature Treatment is as follows: room temperature to 160 ℃ is 2 hours, 160 ℃ are incubated 2 hours, and 160 ℃ ~ 180 ℃ is 1 hour, and 180 ℃ are incubated 1 hour, 180 ℃ ~ 200 ℃ is 1 hour, 200 ℃ are incubated 1 hour, and 200 ℃ ~ 220 ℃ is 1 hour, and 220 ℃ are incubated 4 hours, 220 ℃ to room temperature, naturally cooling.And finally carry out Performance Detection, result is as shown in table 1.

Table 1: frictional coefficient, wear rate and the visual appearance of utilizing the brake facing of embodiment 1 formula preparation.

Exemplifying embodiment 2 and test-results

The weight of this formula of take is benchmark, and the formula per-cent of various raw materials is as follows:

Lanthanide oxide: lanthanum trioxide 5%, cerium oxide 0.1%, Praseodymium trioxide 2%, Neodymium trioxide 0.05%;

Fortifying fibre: ceramic fiber 8%, soft steel fiber 18%, chrome molybdenum fiber 6%, electrolysis red copper fiber 3%;

Binding agent: acrylonitrile butadiene rubber modified resol 15%, antimony sulfide 4%, glass putty 1%, sulphur 4%;

Conditioning agent: zircon sand 5%, corundum 8.85%, without magnetic brown iron oxide 4%, refinery coke carbon dust 5%;

Fill powder: graphite 3%, ground barium sulfate 3%, mica 1%, silicon carbide 2%, norbide 2%.

The raw material taken is in proportion mixed, during batch mixing, adopt the plough type mixing machine to mix, added the absolute ethyl alcohol and stirring that concentration is 99% (v/v); At first add lanthanide oxide and binding agent is mixed and modified, and then other raw material stirring of adding except binding agent are prepared; Increase evacuation process in the batch mixing program, guarantee that the vacuum tightness of this operation is at 0.1MPa.Then carry out coldmoulding, mixed raw material is put into to the die cavity of mould, select the press of 500 tons, pressure is arranged between 0.3MPa and carries out coldmoulding simultaneously, and duration is 30 seconds.Then carry out hot-formingly, pressure is 25MPa, and temperature is 180 ℃, and the press time is 20min.The brake facing made the most at last carries out postorder thermal treatment, and by fixture on hot-forming product clip, the product that then will press from both sides fixture is placed among baking oven, Temperature Treatment is as follows: room temperature to 160 ℃ is 2 hours, 160 ℃ are incubated 2 hours, and 160 ℃ ~ 180 ℃ is 1 hour, and 180 ℃ are incubated 1 hour, 180 ℃ ~ 200 ℃ is 1 hour, 200 ℃ are incubated 1 hour, and 200 ℃ ~ 220 ℃ is 1 hour, and 220 ℃ are incubated 4 hours, 220 ℃ to room temperature, naturally cooling.And finally carry out Performance Detection, result is as shown in table 2.

Table 2: frictional coefficient, wear rate and the visual appearance of utilizing the brake facing of embodiment 2 formula preparations.

Exemplifying embodiment 3 and test-results

The weight of this formula of take is benchmark, and the formula per-cent of various raw materials is as follows:

Lanthanide oxide: lanthanum trioxide 1%, cerium oxide 1%, Praseodymium trioxide 0.5%, Neodymium trioxide 0.5%;

Fortifying fibre: ceramic fiber 8%, soft steel fiber 18%, chrome molybdenum fiber 5%, electrolysis red copper fiber 3%;

Binding agent: acrylonitrile butadiene rubber modified resol 9%, antimony sulfide 1%, glass putty 1%, sulphur 1%;

Conditioning agent: zircon sand 2%, corundum 3%, without magnetic brown iron oxide 9%, refinery coke carbon dust 5%;

Fill powder: graphite 8%, ground barium sulfate 8%, mica 4%, silicon carbide 2%, norbide 10%.

The raw material taken is in proportion mixed, during batch mixing, adopt the plough type mixing machine to mix, added the absolute ethyl alcohol and stirring that concentration is 99% (v/v); At first add lanthanide oxide and binding agent is mixed and modified, and then other raw material stirring of adding except binding agent are prepared; Increase evacuation process in the batch mixing program, the vacuum tightness that guarantees this operation is at-0.1MPa.Then carry out coldmoulding, mixed raw material is put into to the die cavity of mould, select the press of 500 tons, pressure is arranged between 0.3MPa and carries out coldmoulding simultaneously, and duration is 20 seconds.Then carry out hot-formingly, pressure is 20MPa, and temperature is 150 ℃, and the press time is 20min.The brake facing made the most at last carries out postorder thermal treatment, and by fixture on hot-forming product clip, the product that then will press from both sides fixture is placed among baking oven, Temperature Treatment is as follows: room temperature to 160 ℃ is 2 hours, 160 ℃ are incubated 2 hours, and 160 ℃ ~ 180 ℃ is 1 hour, and 180 ℃ are incubated 1 hour, 180 ℃ ~ 200 ℃ is 1 hour, 200 ℃ are incubated 1 hour, and 200 ℃ ~ 220 ℃ is 1 hour, and 220 ℃ are incubated 4 hours, 220 ℃ to room temperature, naturally cooling.And finally carry out Performance Detection, result is as shown in table 3.

Table 3: frictional coefficient, wear rate and the visual appearance of utilizing the brake facing of embodiment 3 formula preparations.

Exemplifying embodiment 4 and test-results

The weight of this formula of take is benchmark, and the formula per-cent of various raw materials is as follows:

Lanthanide oxide: lanthanum trioxide 0.1%, cerium oxide 0.1%, Praseodymium trioxide 0.05%, Neodymium trioxide 0.05%;

Fortifying fibre: ceramic fiber 16%, soft steel fiber 18%, chrome molybdenum fiber 5%, electrolysis red copper fiber 3%;

Binding agent: acrylonitrile butadiene rubber modified resol 9%, antimony sulfide 1%, glass putty 1%, sulphur 1%;

Conditioning agent: zircon sand 2%, corundum 10%, without magnetic brown iron oxide 4%, refinery coke carbon dust 8.7%;

Fill powder: graphite 10%, ground barium sulfate 3%, mica 1%, silicon carbide 2%, norbide 5%.

The raw material taken is in proportion mixed, during batch mixing, adopt the plough type mixing machine to mix, added the absolute ethyl alcohol and stirring that concentration is 99% (v/v); At first add lanthanide oxide and binding agent is mixed and modified, and then other raw material stirring of adding except binding agent are prepared; Increase evacuation process in the batch mixing program, guarantee that the vacuum tightness of this operation is at 0.1MPa.Then carry out coldmoulding, mixed raw material is put into to the die cavity of mould, select the press of 500 tons, pressure is arranged between 0.3MPa and carries out coldmoulding simultaneously, and duration is 30 seconds.Then carry out hot-formingly, pressure is 22MPa, and temperature is 160 ℃, and the press time is 20min.The brake facing made the most at last carries out postorder thermal treatment, and by fixture on hot-forming product clip, the product that then will press from both sides fixture is placed among baking oven, Temperature Treatment is as follows: room temperature to 160 ℃ is 2 hours, 160 ℃ are incubated 2 hours, and 160 ℃ ~ 180 ℃ is 1 hour, and 180 ℃ are incubated 1 hour, 180 ℃ ~ 200 ℃ is 1 hour, 200 ℃ are incubated 1 hour, and 200 ℃ ~ 220 ℃ is 1 hour, and 220 ℃ are incubated 4 hours, 220 ℃ to room temperature, naturally cooling.And finally carry out Performance Detection, result is as shown in table 4.

Table 4: frictional coefficient, wear rate and the visual appearance of utilizing the brake facing of embodiment 4 formula preparations.

Exemplifying embodiment 5 and test-results

The weight of this formula of take is benchmark, and the formula per-cent of various raw materials is as follows:

Lanthanide oxide: lanthanum trioxide 2%, cerium oxide 1%, Praseodymium trioxide 1%, Neodymium trioxide 1%;

Fortifying fibre: ceramic fiber 8%, soft steel fiber 18%, chrome molybdenum fiber 13%, electrolysis red copper fiber 3%;

Binding agent: acrylonitrile butadiene rubber modified resol 9%, antimony sulfide 1%, glass putty 1%, sulphur 1%;

Conditioning agent: zircon sand 2%, corundum 3%, without magnetic brown iron oxide 4%, refinery coke carbon dust 16%;

Fill powder: graphite 3%, ground barium sulfate 4%, mica 2%, silicon carbide 5%, norbide 3%.

The raw material taken is in proportion mixed, during batch mixing, adopt the plough type mixing machine to mix, added the absolute ethyl alcohol and stirring that concentration is 99% (v/v); At first add lanthanide oxide and binding agent is mixed and modified, and then other raw material stirring of adding except binding agent are prepared; Increase evacuation process in the batch mixing program, guarantee that the vacuum tightness of this operation is at 0.05MPa.Then carry out coldmoulding, mixed raw material is put into to the die cavity of mould, select the press of 500 tons, pressure is arranged between 0.4MPa and carries out coldmoulding simultaneously, and duration is 25 seconds.Then carry out hot-formingly, pressure is 24MPa, and temperature is 170 ℃, and the press time is 20min.The brake facing made the most at last carries out postorder thermal treatment, and by fixture on hot-forming product clip, the product that then will press from both sides fixture is placed among baking oven, Temperature Treatment is as follows: room temperature to 160 ℃ is 2 hours, 160 ℃ are incubated 2 hours, and 160 ℃ ~ 180 ℃ is 1 hour, and 180 ℃ are incubated 1 hour, 180 ℃ ~ 200 ℃ is 1 hour, 200 ℃ are incubated 1 hour, and 200 ℃ ~ 220 ℃ is 1 hour, and 220 ℃ are incubated 4 hours, 220 ℃ to room temperature, naturally cooling.And finally carry out Performance Detection, result is as shown in table 5.

Table 5: frictional coefficient, wear rate and the visual appearance of utilizing the brake facing of embodiment 5 formula preparations.

Exemplifying embodiment 6 and test-results

The weight of this formula of take is benchmark, and the formula per-cent of various raw materials is as follows:

Lanthanide oxide: lanthanum trioxide 2.5%, cerium oxide 2%, Praseodymium trioxide 1%, Neodymium trioxide 0.5%;

Fortifying fibre: ceramic fiber 10%, soft steel fiber 20%, chrome molybdenum fiber 7%, electrolysis red copper fiber 5%;

Binding agent: acrylonitrile butadiene rubber modified resol, 11.5%, antimony sulfide 2%, glass putty 1.5%, sulphur 2%;

Conditioning agent: zircon sand 2-5%, corundum 3-10%, without magnetic brown iron oxide 4-9%, refinery coke carbon dust 5-16%;

Fill powder: graphite 4.5%, ground barium sulfate 4%, mica 2.5%, silicon carbide 3.5%, norbide 2.5%.

The raw material taken is in proportion mixed, during batch mixing, adopt the plough type mixing machine to mix, added the absolute ethyl alcohol and stirring that concentration is 99% (v/v); At first add lanthanide oxide and binding agent is mixed and modified, and then other raw material stirring of adding except binding agent are prepared; Increase evacuation process in the batch mixing program, guarantee that the vacuum tightness of this operation is at 0.05MPa.Then carry out coldmoulding, mixed raw material is put into to the die cavity of mould, select the press of 500 tons, pressure is arranged between 0.5MPa and carries out coldmoulding simultaneously, and duration is 25 seconds.Then carry out hot-formingly, pressure is 24MPa, and temperature is 160 ℃, and the press time is 20min.The brake facing made the most at last carries out postorder thermal treatment, and by fixture on hot-forming product clip, the product that then will press from both sides fixture is placed among baking oven, Temperature Treatment is as follows: room temperature to 160 ℃ is 2 hours, 160 ℃ are incubated 2 hours, and 160 ℃ ~ 180 ℃ is 1 hour, and 180 ℃ are incubated 1 hour, 180 ℃ ~ 200 ℃ is 1 hour, 200 ℃ are incubated 1 hour, and 200 ℃ ~ 220 ℃ is 1 hour, and 220 ℃ are incubated 4 hours, 220 ℃ to room temperature, naturally cooling.And finally carry out Performance Detection, result is as shown in table 6.

Table 6: frictional coefficient, wear rate and the visual appearance of utilizing the brake facing of embodiment 6 formula preparations.

Above each embodiment of summary:

Find out from testing data, utilize mine truck brake facing service condition on mine truck of lanthanon modification, its long service life; stable friction factor, the characteristics such as wear rate is low, and relatively the dual face wearing and tearing are little; and, containing asbestos, can not produce asbestos dust contaminate environment and carcinogenic, the braking noiselessness; conform with environmental protection requirement, go back heatproof simultaneously, the heat fading performance is good; can not form gel layer, stable friction factor, good braking performance and good; brake sensitive, conscientiously guaranteed driving safety.Various data show that the mine truck brake facing of this formula preparation can meet the specified conditions that the mine truck weight-carrying capacity is large, working condition severe, the braking number of times is frequent, thermal value is large, meets each class standard of country.

Claims (1)

1. the preparation method of the mine truck brake facing of a lanthanon modification, it is characterized in that: take lanthanide oxide, fortifying fibre, binding agent, conditioning agent and filling powder as adding raw material, adopt batch mixing, cold pressing and hot pressing, and carry out modification through Overheating Treatment and make; Wherein, lanthanide oxide comprises lanthanum trioxide, cerium oxide, Praseodymium trioxide, Neodymium trioxide; Fortifying fibre comprises ceramic fiber, soft steel fiber, chrome molybdenum fiber, electrolysis red copper fiber; Binding agent comprises acrylonitrile butadiene rubber modified resol, antimony sulfide, glass putty, sulphur; Conditioning agent comprises zircon sand, corundum, without magnetic brown iron oxide, refinery coke carbon dust; Fill powder and comprise graphite, ground barium sulfate, mica, silicon carbide, norbide; The weight of this formula of take is benchmark, and the formula per-cent of various raw materials is as follows:

Lanthanide oxide: lanthanum trioxide 0.1-5%, cerium oxide 0.1-5%, Praseodymium trioxide 0.05-2%, Neodymium trioxide 0.05-2%,

Fortifying fibre: ceramic fiber 8-16%, soft steel fiber 18-23%, chrome molybdenum fiber 5-13%, electrolysis red copper fiber 3-10%,

Binding agent: acrylonitrile butadiene rubber modified resol 9-15%, antimony sulfide 1-4%, glass putty 1-4%, sulphur 1-4%,

Conditioning agent: zircon sand 2-5%, corundum 3-10%, without magnetic brown iron oxide 4-9%, refinery coke carbon dust 5-16%,

Fill powder: graphite 3-10%, ground barium sulfate 3-8%, mica 1-4%, silicon carbide 2-8%, norbide 2-10%;

The raw material taken is in proportion mixed, during batch mixing, added absolute ethyl alcohol and stirring; At first add lanthanide oxide and binding agent is mixed and modified, and then other raw material stirring of adding except binding agent are prepared; The batch mixing process is carried out in middle vacuum, and vacuum tightness is at-0.1 ~ 0.1Mpa; Carry out coldmoulding between 0.3MPa ~ 0.6MPa, duration is 20 ~ 30 seconds; Then carry out hot-formingly, pressure is 20MPa ~ 25MPa, and temperature is 150 ℃ ~ 180 ℃, and the press time is 20min; The brake facing made the most at last carries out postorder thermal treatment, thermal treatment temp is controlled as follows: room temperature to 160 ℃ is 2 hours, 160 ℃ are incubated 2 hours, and 160 ℃ ~ 180 ℃ is 1 hour, and 180 ℃ are incubated 1 hour, 180 ℃ ~ 200 ℃ is 1 hour, 200 ℃ are incubated 1 hour, and 200 ℃ ~ 220 ℃ is 1 hour, and 220 ℃ are incubated 4 hours, 220 ℃ to room temperature, naturally cooling.