阅读说明：本技术 一种高温500度耐磨型刹车片及其制备方法 (High-temperature 500-degree wear-resistant brake pad and preparation method thereof ) 是由 洪丹枫 陈进林 李晓颜 傅文锋 周丽巧 于 2020-04-23 设计创作，主要内容包括：本发明涉及车辆制动器技术领域,尤其涉及一种高温500度耐磨型刹车片,用于解决刹车片在高速行驶时高温状态下制动安全隐患高,同时还存在较大的磨耗,缩短寿命的技术问题,其包括以下重量份的原料：鳞片状钛酸钾锂10-20％、氧化锆5-15％、树脂7-10％、铜纤维3-5％、矿物纤维4-6％、摩擦粉2-5％、橡胶粉1-3％、芳纶2-5％、硫化锡3-5％、碳物组合物3-8％、氢氧化钙3-7％、云母粉2-4％,余量为硫酸钡。本发明采取用加入新材料鳞片状钛酸钾锂和氧化锆对摩擦材料进行改进,使其具有更好的高温耐磨损性能,极大的提高刹车片的使用寿命。(The invention relates to the technical field of vehicle brakes, in particular to a high-temperature 500-degree wear-resistant brake pad, which is used for solving the technical problems that the brake pad has high braking potential safety hazard in a high-temperature state when running at a high speed, has larger abrasion and shortens the service life and comprises the following raw materials in parts by weight: 10-20% of flaky lithium potassium titanate, 5-15% of zirconium oxide, 7-10% of resin, 3-5% of copper fiber, 4-6% of mineral fiber, 2-5% of friction powder, 1-3% of rubber powder, 2-5% of aramid fiber, 3-5% of tin sulfide, 3-8% of carbon composition, 3-7% of calcium hydroxide, 2-4% of mica powder and the balance barium sulfate. The friction material is improved by adding the novel materials of the flaky potassium lithium titanate and the zirconium oxide, so that the friction material has better high-temperature wear resistance and the service life of the brake pad is greatly prolonged.)

1. The high-temperature 500-degree wear-resistant brake pad is characterized by comprising the following raw materials in parts by weight: 10-20% of flaky lithium potassium titanate, 5-15% of zirconium oxide, 7-10% of resin, 3-5% of copper fiber, 4-6% of mineral fiber, 2-5% of friction powder, 1-3% of rubber powder, 2-5% of aramid fiber, 3-5% of tin sulfide, 3-8% of carbon composition, 3-7% of calcium hydroxide, 2-4% of mica powder and the balance barium sulfate.

2. A high temperature 500 degree wear resistant brake pad as claimed in claim 1, wherein the zirconia particle size is 1.5-2.5 μm.

3. A high temperature 500 degree wear resistant brake pad as claimed in claim 1, wherein said carbonaceous composition comprises graphite and coke, wherein the weight ratio of graphite to coke is 2-6: 1-3.

4. A high temperature 500 degree wear resistant brake pad as claimed in claim 1, wherein said resin is one or more of phenolic resin, epoxy resin, silicone resin or polyethylene resin.

5. A method of making a high temperature 500 degree wear resistant brake pad according to any one of claims 1-4, comprising the steps of:

s1, mixing the raw materials: pouring the scaly potassium lithium titanate, the resin, the copper fiber, the mineral fiber, the aramid fiber and the barium sulfate in parts by weight into a mixer, uniformly mixing for 10-15min, pouring the rest raw materials into the mixer, uniformly mixing for 10-15min, and obtaining a mixed material A;

s2, pressing: putting the mixed material A into a hot press, and pressing with the cleaned steel back under the pressure of 300-²The temperature is 155-;

s3, heat treatment: putting the semi-finished product B into an oven for heat treatment, wherein the heat treatment time is 4-8h, and the temperature is 150-;

s4, machining: and grinding the semi-finished product C into brake pads with different specifications according to requirements, uniformly spraying paint/powder on the surfaces of the brake pads, naturally drying the brake pads, and then performing appearance transfer printing, packaging and warehousing to obtain the high-temperature-resistant and wear-resistant brake pads.

6. The method as claimed in claim 5, wherein in S1, the mixing speed of the mixer is 2000-2200 r/min.

7. The method for preparing a high-temperature 500-degree wear-resistant brake pad according to claim 5, wherein in the step S2, the mixed material A is weighed before being put into the hot press, and the weight error of the mixed material A is +/-0.5 g.

Technical Field

The invention relates to the technical field of vehicle brakes, in particular to a high-temperature 500-degree wear-resistant brake pad and a preparation method thereof.

Background

Due to the progress in high performance and high speed capability of vehicles, the role of the brake becomes more and more important, and the brake must have a sufficiently high coefficient of friction (effectiveness). Further, since the temperature becomes high at the time of braking at a high speed, the friction state in this case is different from the case of braking at a low temperature and a low speed, a change in the friction coefficient due to a temperature change is required to be small, and stable friction properties are required.

The requirements for the brake are higher and higher due to the continuous development of high performance and high speed capability of the vehicle, the temperature of a friction material can be instantly increased when the vehicle is braked in the running process of high speed or long downhill, mountainous regions and other road conditions, the brake pad can be in a high-temperature state for a long time due to the continuous braking, the friction coefficient of the brake pad material can be reduced due to the increase of the temperature, the abrasion of the brake pad can be increased along with the increase of the temperature and the speed, the service life is greatly shortened, and potential safety hazards exist.

Therefore, the performance of the brake pad is improved by adding the novel material of the scaly potassium lithium titanate, so that the brake pad has better high-temperature wear resistance.

Disclosure of Invention

Based on the technical problems that the brake pad in the background technology has high braking potential safety hazard in a high-temperature state when running at high speed, and has larger abrasion and shortened service life, the invention provides a high-temperature 500-degree wear-resistant brake pad and a preparation method thereof.

The invention provides a high-temperature 500-degree wear-resistant brake pad, which comprises the following raw materials in parts by weight: 10-20% of flaky lithium potassium titanate, 5-15% of zirconium oxide, 7-10% of resin, 3-5% of copper fiber, 4-6% of mineral fiber, 2-5% of friction powder, 1-3% of rubber powder, 2-5% of aramid fiber, 3-5% of tin sulfide, 3-8% of carbon composition, 3-7% of calcium hydroxide, 2-4% of mica powder and the balance barium sulfate.

Preferably, the particle size of the zirconia is 1.5 to 2.5 μm.

Preferably, the carbonaceous composition comprises graphite and coke, wherein the weight ratio of graphite to coke is 2-6: 1-3.

Preferably, the resin is one or more of a phenolic resin, an epoxy resin, a silicone resin or a polyethylene resin.

The second aspect of the invention provides a preparation method of a high-temperature 500-degree wear-resistant brake pad, which comprises the following steps:

s1, mixing the raw materials: pouring the scaly potassium lithium titanate, the resin, the copper fiber, the mineral fiber, the aramid fiber and the barium sulfate in parts by weight into a mixer, uniformly mixing for 10-15min, pouring the rest raw materials into the mixer, uniformly mixing for 10-15min, and obtaining a mixed material A;

s2, pressing: putting the mixed material A into a hot press, and pressing with the cleaned steel back under the pressure of 300-²The temperature is 155-;

s3, heat treatment: putting the semi-finished product B into an oven for heat treatment, wherein the heat treatment time is 4-8h, and the temperature is 150-;

s4, machining: and grinding the semi-finished product C into brake pads with different specifications according to requirements, uniformly spraying paint/powder on the surfaces of the brake pads, naturally drying the brake pads, and then performing appearance transfer printing, packaging and warehousing to obtain the high-temperature-resistant and wear-resistant brake pads.

Preferably, in S1, the mixing speed of the mixer is 2000-2200 r/min.

Preferably, in the S2, the mixed material A is weighed before being put into a hot press, and the weight error of the mixed material A is +/-0.5 g.

ScaleLithium potassium titanate having the chemical formula K_0.7Li_0.27Ti_1.73O₄The color is white, the crystal is flaky, the melting point is 1150-1200 ℃, and the true density is 3.0-3.3g/cm³Water content not greater than 0.8 wt.%. In addition, the lithium potassium titanate and the potassium magnesium titanate have similar structures and similar performances, and belong to a layered alkali metal titanate with a lepidocrocite-type layered structure. In this structure, K + occupies the interlayer, the activity is the greatest, cation exchange is most easily performed, Li + is not in the interstitial space between the layers, but occupies the TiO6 octahedral position in the skeleton layer structure of the main body, which is less active than K +. Therefore, not only the K + between the layers can undergo cation exchange, but also Li + at the octahedral position of TiO6 can participate in the cation exchange reaction.

Typical characteristics of lithium potassium titanate platelets are as follows:

1. the micro appearance is sheet;

2. a layered compound of chemical structure;

3. has stable friction coefficient;

4. the hardness is moderate, and the brake disc is not damaged;

5. the fluidity is good;

6. low abrasion at medium and high temperature.

Compared with the prior art, the invention has the beneficial effects that the friction material is improved by adding new materials of scaly lithium potassium titanate and zirconia, so that the friction material has better high-temperature wear resistance, and meanwhile, the brake pad is processed to form a product by adopting a heat treatment box through the processing technologies of material mixing, hot press forming, heat treatment, grinding, spraying and the like, wherein the heat treatment equipment has the treatment temperature of 150-200 ℃ and the time of 4-8h, so that the brake pad has better high-temperature resistance and wear resistance, the problem of excessive wear caused by high-speed use of conventional materials is solved, the product quality is improved, and the service life of the brake pad is greatly prolonged. The invention solves the problems of high potential safety hazard, large abrasion and short service life of the brake pad in a high-temperature state during high-speed running, and has simple preparation method and low cost.

Detailed Description

The present invention will be further illustrated with reference to the following specific examples.