CN114672132A - High-performance copper-free resin-based brake material prepared from fly ash hollow microspheres - Google Patents
High-performance copper-free resin-based brake material prepared from fly ash hollow microspheres Download PDFInfo
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Abstract
The invention discloses a high-performance copper-free resin-based brake material prepared from fly ash cenospheres, which is prepared from the following raw materials in parts by weight: 10-20 parts of fly ash hollow microspheres, 10-20 parts of cashew nut shell oil modified phenolic resin, 5-10 parts of coconut shell fibers, 10-20 parts of aluminum oxide, 3 parts of graphite, 5 parts of rubber powder and 22-47 parts of barium sulfate powder. The invention utilizes the fly ash hollow microspheres to replace copper which is harmful to the environment and has higher cost in the brake material, improves the friction performance of the brake material and effectively reduces the cost of the brake material. The brake material does not contain heavy metal components such as copper, lead, zinc, antimony and the like, has excellent frictional wear performance, and solves the problem of poor high-temperature tribological performance of the copper-free brake material.
Description
Technical Field
The invention relates to the field of brake materials, in particular to a high-performance copper-free environment-friendly brake material prepared by applying fly ash cenospheres to a brake material.
Background
In the research of coal ash utilization, people find that the coal ash in a thermal power station contains 50-80% of hollow glass microspheres, the main components of the hollow glass microspheres are silicon dioxide and aluminum oxide, the hollow glass microspheres are formed by high-temperature firing, the diameters of the hollow glass microspheres are 5-1000 micrometers, and the hollow glass microspheres are a loose inorganic nonmetal powder material with good fluidity. The hollow micro-beads have the advantages of sound insulation, heat insulation, low density, high temperature resistance, wear resistance and high compressive strength. Can be used as high-quality filler for products such as heat-insulating coating, adhesive, engineering plastics, modified rubber, electrical appliance insulating parts, glass fiber reinforced plastics and the like.
With the rapid development of global industry and the enhancement of environmental awareness of people, the requirements for brake materials (brake pads) are increasing, and not only safety and comfort are required, but also environmental protection is required, and the requirements for high-performance friction materials are more urgent. However, in recent years, it has been found that the granules formed during the use of the brake material contain certain heavy metal elements, such as copper, lead, zinc, antimony, etc., and the granules with the particle size less than 10 μm can be inhaled by human body, thereby causing diseases and threatening the health of human beings, animals and plants. Related studies have shown that copper-containing abrasive dust generated by braking is one of the sources of copper in major water runoff of highway rain, which can cause rapid death of aquatic organisms due to its neurobehavioral toxicity. The generation of harmful particulate matter from braking has become an increasingly serious environmental problem. The state of washington in the united states of 2014 first limited the use of copper powder and other harmful substances in brake materials by law, requiring copper content in brake materials of less than 5wt% in 2021 and less than 0.5wt% in 2023, and countries around the world are also gradually beginning to limit the use of copper in brake materials. Therefore, the search for copper as an alternative material in brake materials has become an urgent research topic in the friction material industry.
The resin-based friction material has the advantages of low cost, simple production process, wide application range, easy performance adjustment and the like, and is the most widely applied automobile brake material at present. Copper has excellent heat-conducting property and plays an important role in the high-temperature tribological property of the resin-based braking material. For example, copper has excellent heat-conducting property, and can effectively conduct the high temperature on the friction surface, so that the heat fading resistance of the brake material is improved; copper can play a role in high-temperature solid lubrication, reduce brake noise and the like. For example, in patent nos. CN112745802A and CN107461436A, a single layer of thermally modified synthetic graphite and aluminum fiber are respectively used in combination with other components to replace copper powder, so as to attempt to quickly conduct away the frictional heat during braking and reduce the occurrence of heat fading; the patent CN109929511B reduces the wear rate of the friction material by adding artificial graphite, aluminum alloy fiber and the like; patent CN109931350A utilizes graphite alkene in the braking process to produce the friction synergism with aramid fiber, zinc powder, thereby reaches the effect of substituting copper at the surperficial friction transfer membrane that forms graphite alkene reinforcing, has improved the wearability of material. The high-temperature friction performance of the copper-free moving material obtained by the research is not equal to that of the copper-containing material.
As mentioned above, the main components of the waste material of the thermal power plant, namely the fly ash cenospheres, are silicon dioxide and aluminium oxide, and the hollow cenospheres is prepared by high-temperature firing, and has the characteristics of sound insulation, heat insulation, small density, high temperature resistance, wear resistance and the like. The application of the hollow coal ash microspheres in the preparation of the resin-based braking material can realize the high-added-value reutilization of the hollow coal ash microspheres and the copper-free performance of the braking material, and has important significance for the green sustainable development of the braking material industry in China.
Disclosure of Invention
In order to solve the problems, the fly ash hollow microspheres are used as functional fillers of the brake material to replace copper powder to play a role in the brake material, the high-performance and copper-free environment-friendly brake material is prepared by researching the content of the fly ash hollow microspheres and the interaction between the fly ash hollow microspheres and resin and reinforcing fibers, the friction coefficient is 0.55-0.65, the friction coefficient at the high temperature of 350 ℃ is higher than that at the low temperature (100 ℃), and the problem of poor high-temperature tribology performance of the copper-free brake material is solved.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a high-performance copper-free mobile material prepared from fly ash cenospheres, which comprises the following components: fly ash hollow microspheres, cashew nut shell oil modified phenolic resin, coconut shell fiber, alumina, graphite, rubber powder and barium sulfate.
Further, the raw materials comprise the following components in parts by weight: 10-20 parts of fly ash hollow microspheres, 10-20 parts of cashew nut shell oil modified phenolic resin, 5-10 parts of coconut shell fibers, 10-20 parts of aluminum oxide, 3 parts of graphite, 5 parts of rubber powder and 22-47 parts of barium sulfate powder.
Further, the fly ash cenospheres are cenospheres in waste fly ash of a thermal power plant, and the mesh number of the cenospheres is 60-200 meshes.
Furthermore, the coconut shell fiber is chopped coconut shell fiber, and the length of the chopped coconut shell fiber is less than 10 mm.
Further, the cashew nut shell oil modified phenolic resin is produced by Nantong Sumitomo bakelite Co., Ltd, Jiangsu province, or Shandong Laiwu Rundao New Material Co., Ltd, or is produced by Youji chemical Co., Ltd, namely, cashew nut shell oil modified phenolic resin PF-221.
In the second aspect of the invention, the provided high-performance copper-free resin-based brake material does not contain heavy metal components such as copper, lead, zinc, antimony and the like.
In a third aspect of the invention, a high-performance copper-free resin-based braking material is provided, which has the following properties:
1) the friction coefficient is 0.55-0.65;
2) the friction coefficient at 350 ℃ is not lower than that at 100 ℃;
3) the wear rate is 0-1.0 x 10-7cm3/(N•m)。
The fourth aspect of the invention provides a method for preparing a high-performance copper-free mobile material by using the fly ash cenospheres, which comprises the following steps:
1) fiber chopping: and shearing the coconut shell fiber by a fiber cutting machine to prepare the coconut shell fiber with the length less than 10 mm.
2) Drying of raw materials: drying cashew nut shell oil modified phenolic resin at 50-60 ℃ for 0.5 hour, drying coconut fiber at 100-120 ℃ for 1.5 hours, drying rubber powder at 80-100 ℃ for 0.5 hour, and drying other components (fly ash cenospheres, alumina, graphite and barium sulfate powder) at 100-120 ℃ for 1 hour.
3) Mixing materials: and (3) mixing the dried raw materials (except the coconut shell fibers) according to an experimental design formula in a mixer with a plurality of groups of high-speed rotating cutters for 3-5 min, and then putting the coconut shell fibers into the mixer to mix for 1-2 min to obtain a uniform powdery mixed material.
4) Hot-press molding: weighing the uniformly mixed mixture, and carrying out hot pressing in a hydraulic press, wherein the forming temperature is 165-170 ℃, the pressure is 25-35 MPa, the pressure maintaining time is 6-8 min, and the air is exhausted for 5-6 times.
5) And (3) heat treatment: and (3) placing the sample obtained by hot-press molding into an electric heating constant-temperature air-blast drying oven, carrying out heat treatment at 160 ℃ for 12 hours, and cooling along with the oven to obtain the high-performance copper-free resin-based brake material.
The invention has the beneficial effects that:
(1) the brake material does not contain heavy metal components such as copper, lead, zinc, antimony and the like, has excellent frictional wear performance, particularly has outstanding heat fading resistance, and is specifically represented as follows: the friction coefficient at the high temperature of 350 ℃ is higher than that at the low temperature (100 ℃), and the problem of poor high-temperature tribological performance of the copper-free moving material is solved.
(2) The brake material utilizes the fly ash hollow microspheres to replace copper which is harmful to the environment and has higher cost in the brake material, so that the friction performance of the brake material is improved, and the cost of the brake material is effectively reduced.
(3) The invention efficiently utilizes waste materials of thermal power plants, can provide a new way for the high-added-value reutilization of the fly ash, accords with the concept of green and sustainable development, and has good application prospect and engineering application value.
(4) The fly ash hollow microspheres are added into the friction material, so that the thermal stability of the friction material can be obviously improved, and the high-temperature friction coefficient of the friction material is improved; the phenolic resin modified by cashew nut shell oil can improve the shear strength and the thermal decomposition temperature of the resin, and can effectively improve the wear resistance and the mechanical property of a sample; the coconut fiber has the advantages of light weight, low cost, regeneration and biodegradability, and can be used as a reinforcing fiber of a friction material to improve the friction and wear properties of the material; the aluminum oxide is used as a friction-increasing functional filler, and the aluminum oxide is added into the brake material to increase the medium-low temperature friction coefficient of the friction material; the rubber powder is used as an organic space filler, and is added into the brake material, so that the hardness and density of the friction material are reduced, the friction coefficient is stabilized, and the abrasion is reduced; barium sulfate is used as an inorganic space filler, and mainly has the function of reducing the cost of the braking material; the graphite is used as a solid lubricant, and is added into the friction material to reduce the change of the friction coefficient during braking, stabilize the friction coefficient and reduce the abrasion of the mating material.
Drawings
FIG. 1 is a thermal stability diagram of fly ash cenospheres.
Detailed Description
As described in the background section, copper plays an important role in the high temperature friction performance of resin-based braking materials. The hollow flyash microballoon consists of mainly silica and alumina and has the features of sound isolating, heat isolating, low density, high temperature resistance, high wear resistance, etc. Therefore, the fly ash cenospheres are adopted to replace copper in the brake material, and the high-performance copper-free resin-based brake material is obtained by researching the content of the fly ash cenospheres and the interaction between the fly ash cenospheres and resin and reinforcing fibers.
In order to more intuitively know the thermal stability of the coal ash cenospheres, TG/DSC is adopted to represent the thermal stability of the coal ash cenospheres, and the result is shown in figure 1. As can be seen from FIG. 1, the mass loss of the fly ash cenosphere particles from room temperature to 1000 ℃ in the air atmosphere is only 1 wt%. Therefore, the fly ash hollow microspheres have better thermal stability, and the thermal stability of the friction material can be improved by adding the fly ash hollow microspheres into the friction material.
Further, the component proportion of the braking material is optimized by adopting an orthogonal optimization experiment, and the synergistic effect among the components is analyzed to obtain the high-performance copper-free resin-based braking material optimized formula. The orthogonal levels are shown in table 1, and the effect of the components and their interaction on the coefficient of friction of the brake material is shown in table 2. At a low temperature stage (100-150 ℃), the content of the fly ash hollow microspheres has a high significant influence on the friction coefficient of a sample; the resin content has obvious influence on the friction coefficient of the sample, and the effect is second to that of the fly ash hollow microsphere; the content of coconut fiber, the interaction between resin and the micro-beads and the interaction between the aluminum oxide and the micro-beads have certain influence on the friction coefficient of the friction material. In the medium-temperature stage (200-250 ℃), the alumina powder has the best effect of improving the friction coefficient of the sample, and a large amount of alumina powder exists on the surface of the sample at the stage, so that the plough function in the braking process is enhanced, and the friction coefficient of the material is improved; the resin content and the interaction between the fly ash cenospheres and the resin influence the friction coefficient of the sample; the interaction of the coconut shell fiber, the fly ash hollow microsphere and the coconut shell fiber has certain influence on the friction coefficient of the sample. At a high temperature stage (300-350 ℃), the content of the fly ash hollow microspheres and the content of resin have the strongest influence on the friction coefficient of the sample; the interaction of the resin and the microbeads has a significant effect on the friction coefficient of the sample; it is worth proposing that the degree of influence of the alumina powder on the friction coefficient of the sample at 300 ℃ is equivalent to the effect of the resin and the microbeads; the friction coefficient of the sample is also influenced by the fiber at 350 ℃, and the friction coefficient is influenced by the interaction of the microbeads and the coconut shell fiber. In general, it was found that the factors having a large influence on the friction coefficient of the sample were mainly microbeads, resin, and alumina.
TABLE 1 orthogonal horizon table
TABLE 2 Effect of the Components on the coefficient of friction
Note: the effects of the delta-alpha-
In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions of the present application are described in detail below with reference to specific examples. Preferably, according to the content of the hollow micro-beads of the fly ash and the interaction between the hollow micro-beads of the fly ash and the resin and the reinforcing fibers, the following preferred embodiments are obtained:
chopping coconut shell fibers to obtain fibers with the length of less than 10 mm; drying cashew nut shell oil modified phenolic resin at 50-60 ℃ for 0.5 hour, drying coconut shell fiber at 100-120 ℃ for 1.5 hours, drying rubber powder at 80-100 ℃ for 0.5 hour, and drying other components at 100-120 ℃ for 1 hour; mixing the dried raw materials (except the coconut shell fibers) according to an experimental design formula, putting the raw materials into a mixer with a plurality of groups of high-speed rotating cutters for mixing for 3-5 min, and then putting the coconut shell fibers into the mixer for mixing for 1-2 min to obtain a uniform powdery mixed material; hot-pressing the uniformly mixed mixture, wherein the forming temperature is 165-170 ℃, the pressure is 25-35 MPa, the pressure maintaining time is 6-8 min, and the air is exhausted for 5-6 times; and (3) putting the sample obtained by hot press molding into a heat treatment box, carrying out heat treatment at 160 ℃ for 12 hours, and cooling along with a furnace to obtain the high-performance copper-free resin-based brake material.
Example 1
1) Composition of raw materials (in parts by weight)
10 parts of fly ash hollow microspheres, 15 parts of cashew nut shell oil modified phenolic resin, 5 parts of coconut shell fibers, 20 parts of aluminum oxide, 3 parts of graphite, 5 parts of rubber powder and 42 parts of barium sulfate powder.
2) The preparation method comprises the following steps:
chopping coconut shell fibers to obtain fibers with the length of less than 10 mm; drying phenolic resin at 50 deg.C for 0.5 hr, drying coconut shell fiber at 100 deg.C for 1.5 hr, drying rubber powder at 80 deg.C for 0.5 hr, and drying other components at 100 deg.C for 1 hr; mixing the dried raw materials (except for coconut shell fiber) according to an experimental design formula, putting the raw materials into a mixer with a plurality of groups of high-speed rotating cutters, mixing for 3min, and putting the coconut shell fiber into the mixer to mix for 1min to obtain a uniform powdery mixed material; hot-pressing the uniformly mixed mixture, wherein the molding temperature is 165 ℃, the pressure is 25MPa, the pressure maintaining time is 6min, and 5 times of air exhaust are carried out in the period; and (3) putting the sample obtained by hot press molding into a heat treatment box, carrying out heat treatment at 160 ℃ for 12 hours, and cooling along with the furnace.
Example 2
1) Composition of raw materials (in parts by weight)
15 parts of fly ash hollow microspheres, 15 parts of cashew nut shell oil modified phenolic resin, 5 parts of coconut shell fibers, 20 parts of aluminum oxide, 3 parts of graphite, 5 parts of rubber powder and 37 parts of barium sulfate powder.
2) The preparation method comprises the following steps:
chopping coconut shell fibers to obtain fibers with the length of less than 10 mm; drying phenolic resin at 55 deg.C for 0.5 hr, drying coconut shell fiber at 110 deg.C for 1.5 hr, drying rubber powder at 90 deg.C for 0.5 hr, and drying other components at 110 deg.C for 1 hr; mixing the dried raw materials (except for coconut shell fiber) according to an experimental design formula, putting the raw materials into a mixer with a plurality of groups of high-speed rotating cutters, mixing for 4min, and putting the coconut shell fiber into the mixer to mix for 2min to obtain a uniform powdery mixed material; hot-pressing the uniformly mixed mixture, wherein the molding temperature is 170 ℃, the pressure is 30MPa, the pressure maintaining time is 7min, and the air is exhausted for 6 times; and (3) putting the sample obtained by hot press molding into a heat treatment box, carrying out heat treatment at 160 ℃ for 12 hours, and cooling along with the furnace.
Example 3
1) Composition of raw materials (in parts by weight)
20 parts of fly ash hollow microspheres, 15 parts of cashew nut shell oil modified phenolic resin, 10 parts of coconut shell fibers, 20 parts of aluminum oxide, 3 parts of graphite, 5 parts of rubber powder and 27 parts of barium sulfate powder.
2) The preparation method comprises the following steps:
chopping coconut shell fibers to obtain fibers with the length of less than 10 mm; drying phenolic resin at 60 deg.C for 0.5 hr, drying coconut shell fiber at 120 deg.C for 1.5 hr, drying rubber powder at 100 deg.C for 0.5 hr, and drying other components at 120 deg.C for 1 hr; mixing the dried raw materials (except for coconut shell fiber) according to an experimental design formula, putting the raw materials into a mixer with a plurality of groups of high-speed rotating knives, mixing for 5min, and putting the coconut shell fiber into the mixer to mix for 1min to obtain a uniform powdery mixed material; hot-pressing the uniformly mixed mixture, wherein the molding temperature is 175 ℃, the pressure is 35MPa, the pressure maintaining time is 8min, and the exhaust is carried out for 6 times; and (3) putting the sample obtained by hot press molding into a heat treatment box, carrying out heat treatment at 160 ℃ for 12 hours, and cooling along with the furnace.
Example 4
1) Composition of raw materials (in parts by weight)
20 parts of fly ash hollow microspheres, 15 parts of cashew nut shell oil modified phenolic resin, 10 parts of coconut shell fibers, 15 parts of aluminum oxide, 3 parts of graphite, 5 parts of rubber powder and 32 parts of barium sulfate powder.
2) The preparation method comprises the following steps:
chopping coconut shell fibers to obtain fibers with the length of less than 10 mm; drying phenolic resin at 50 deg.C for 0.5 hr, drying coconut shell fiber at 110 deg.C for 1.5 hr, drying rubber powder at 80 deg.C for 0.5 hr, and drying other components at 120 deg.C for 1 hr; mixing the dried raw materials (except for coconut shell fiber) according to an experimental design formula, putting the raw materials into a mixer with a plurality of groups of high-speed rotating knives, mixing for 5min, and putting the coconut shell fiber into the mixer to mix for 1min to obtain a uniform powdery mixed material; hot-pressing the uniformly mixed mixture, wherein the molding temperature is 165 ℃, the pressure is 25MPa, the pressure maintaining time is 6min, and the air is exhausted for 6 times; and (3) putting the sample obtained by hot press molding into a heat treatment box, carrying out heat treatment at 160 ℃ for 12 hours, and cooling along with the furnace.
Comparative example 1
1) Composition of raw materials (in parts by weight)
20 parts of copper powder, 15 parts of cashew nut shell oil modified phenolic resin, 10 parts of coconut shell fiber, 20 parts of aluminum oxide, 3 parts of graphite, 5 parts of rubber powder and 27 parts of barium sulfate powder.
2) The preparation method comprises the following steps:
the fly ash cenospheres in example 3 were replaced with the same amount of copper powder, and the preparation method was the same as in example 3.
Comparative example 2
1) Composition of raw materials (in parts by weight)
5 parts of fly ash hollow microspheres, 15 parts of cashew nut shell oil modified phenolic resin, 10 parts of coconut shell fibers, 20 parts of aluminum oxide, 3 parts of graphite, 5 parts of rubber powder and 27 parts of barium sulfate powder.
2) The preparation method comprises the following steps:
the preparation method is the same as example 3.
Comparative example 3
1) Composition of raw materials (in parts by weight)
25 parts of fly ash hollow microspheres, 15 parts of cashew nut shell oil modified phenolic resin, 10 parts of coconut shell fibers, 20 parts of aluminum oxide, 3 parts of graphite, 5 parts of rubber powder and 27 parts of barium sulfate powder.
2) The preparation method comprises the following steps:
the preparation method is the same as example 3.
Test example:
the brake materials prepared in examples 1 to 4 and comparative examples 1 to 3 were subjected to a frictional wear performance test on an X-DM type pressure-regulating and speed-changing friction tester, and the frictional coefficient and the wear rate at 100 ℃, 150 ℃, 200 ℃, 250 ℃, 300 ℃ and 350 ℃ of the disc temperature during the temperature rise and fall were measured, respectively, according to the requirements of the fourth type of lining for disc brakes in the national standard for linings for disc brakes (GB 5763-2008). The results are shown in tables 3 and 4, respectively. The allowable values of the national standards for a pad for a disc brake are shown in Table 5.
TABLE 3 results of friction coefficient test of different samples
Table 4 wear rate test results for different samples
TABLE 5 allowable values of national standards for linings for disc brakes
aExperiment temperature refers to the temperature of the friction surface of the disc of the testing machine
bThe range of the friction coefficient includes the allowable deviation
From the above experimental data, it can be seen that the friction coefficient and the wear rate of the embodiment of the present invention are within the range of the national standard allowable values, and the friction coefficient is at a higher level, compared with the national standard allowable value. The friction coefficients of the embodiments of the invention are all 0.55-0.65, and the wear rate is 0-1.0 multiplied by 10-7cm3And the friction coefficients of the examples 1 to 4 at 350 ℃ are all higher than the friction coefficient at 100 ℃, which shows that the brake material has no heat fading at high friction temperature and has excellent heat fading resistance. Compared with comparative examples 1-3, the high-performance copper-free resin-based brake material of the invention has higher friction coefficient at both low temperature and high temperature. The main components of the fly ash hollow microsphere are silicon dioxide and aluminum oxide, and the fly ash hollow microsphere has the characteristics of sound insulation, heat insulation, high temperature resistance, wear resistance and the like after being fired at high temperature. The friction coefficient of the brake material, especially the high-temperature friction coefficient, can be effectively improved by adding the fly ash hollow microspheres. Therefore, the friction performance and the heat fading resistance of the brake material can be improved by replacing the copper powder with the fly ash cenospheres, the problem of copper-free and high performance of the brake material is solved, the high added value reutilization of the fly ash cenospheres can be realized, and compared with comparative examples 2-3, the content of the fly ash cenospheres has obvious influence on the friction coefficient and the wear rate of the brake material in example 3.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (4)
1. A high-performance copper-free resin-based brake material prepared from fly ash cenospheres is characterized by being prepared from the following raw materials in parts by weight: 10-20 parts of fly ash hollow microspheres, 10-20 parts of cashew nut shell oil modified phenolic resin, 5-10 parts of coconut shell fibers, 10-20 parts of aluminum oxide, 3 parts of graphite, 5 parts of rubber powder and 22-47 parts of barium sulfate powder;
the coal ash hollow microspheres are hollow microspheres in waste coal ash of a thermal power plant, and the mesh number is 60-200 meshes;
the coconut fiber is short coconut fiber, and the length is less than 10 mm.
2. The high-performance copper-free resin-based braking material prepared from the fly ash cenospheres according to claim 1, wherein the preparation method of the braking material comprises the following steps:
1) drying of raw materials: drying cashew nut shell oil modified phenolic resin at 50-60 ℃ for 0.5 hour, drying coconut fiber at 100-120 ℃ for 1.5 hours, drying rubber powder at 80-100 ℃ for 0.5 hour, and drying other components at 100-120 ℃ for 1 hour;
2) mixing materials: putting the dried raw materials except the coconut shell fiber into a mixer with a plurality of groups of high-speed rotating knives according to the proportion, mixing for 3-5 min, and putting the coconut shell fiber into the mixer to mix for 1-2 min to obtain a uniform powdery mixed material;
3) hot-press molding: weighing the uniformly mixed materials, and carrying out hot pressing in a hydraulic press, wherein the forming temperature is 165-170 ℃, the pressure is 25-35 MPa, the pressure maintaining time is 6-8 min, and the gas is exhausted for 5-6 times;
4) and (3) heat treatment: and (3) placing the sample obtained by hot-press molding into an electric heating constant-temperature air-blast drying oven, carrying out heat treatment at 160 ℃ for 12 hours, and cooling along with the oven to obtain the high-performance copper-free resin-based brake material.
3. The high performance copper-free resin based brake material as claimed in claim 1, wherein the brake material is free of heavy metal components including copper, lead, zinc and antimony.
4. The high performance copper-free resin based brake material as claimed in claim 1, wherein the high performance copper-free resin based brake materialThe brake material has the following properties: the friction coefficient is 0.55-0.65; the friction coefficient at 350 ℃ is not lower than the friction coefficient at 100 ℃; the wear rate is 0-1.0X 10-7cm3/(N•m)。
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