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Friction material, composite brake shoe and preparation method

A friction material and a technology for synthesizing brake shoes, which are applied to friction linings, chemical instruments and methods, mechanical equipment, etc., can solve the problems of poor thermal conductivity of high-friction composite brake shoes, rail moisture sensitivity, and frequent braking of brake shoes. Excellent instantaneous high temperature resistance and mechanical properties, good impact resistance, and the effect of ensuring braking distance

Inactive Publication Date: 2020-04-21
BEIJING TIANYISHANGJIA NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, large-scale road maintenance machinery vehicles have heavy axles and relatively low operating speeds. During road maintenance, the brake shoes brake frequently, and the large friction coefficient will inevitably generate high energy, resulting in defects such as brake shoes falling blocks / cracks.
High-friction synthetic brake shoes will also have metal inlays during braking, causing damage to the wheel tread
In addition, high-friction synthetic brake shoes have poor thermal conductivity and are sensitive to rail moisture

Method used

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  • Friction material, composite brake shoe and preparation method
  • Friction material, composite brake shoe and preparation method
  • Friction material, composite brake shoe and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The friction material provided in this example is composed of the following raw materials: 25g of steel fiber, 5g of boron-modified phenolic resin, 10g of phenolic resin, 3g of nitrile rubber powder, 10g of graphite, 5g of glass fiber, 5g of basalt fiber, 2g of barite, Aramid fiber 1g, calcium hydroxide 15g, silicon carbide 1g, aluminum oxide 2g.

[0038] Wherein, the aspect ratio of the steel fiber is 60:1, and its diameter is 0.04mm; the aspect ratio of the glass fiber is 300:1, and its diameter is 0.04mm; the aspect ratio of the basalt fiber is 300 : 1, its diameter is 0.04mm.

[0039] Synthetic brake shoes are prepared from the above-mentioned friction materials, and the preparation method is as follows:

[0040] According to the above-mentioned ratio, each component is uniformly mixed to obtain a mixture;

[0041] Put the mixture in the mold, and press it at 5Mpa, 120°C for 180s to obtain a blank;

[0042] The pressed blank was heated and cured at 210° C. for 36...

Embodiment 2

[0044] The friction material provided in this example is composed of the following raw materials: 30g of steel fiber, 8g of boron-modified phenolic resin, 15g of phenolic resin, 5g of nitrile rubber powder, 15g of graphite, 10g of glass fiber, 10g of basalt fiber, 5g of barite, Aramid 2g, calcium hydroxide 20g, silicon carbide 2g, aluminum oxide 5g.

[0045] Wherein, the aspect ratio of the steel fiber is 30:1, and its diameter is 0.03mm; the aspect ratio of the glass fiber is 200:1, and its diameter is 0.05mm; the aspect ratio of the basalt fiber is 200 : 1, its diameter is 0.04mm.

[0046] Synthetic brake shoes are prepared from the above-mentioned friction materials, and the preparation method is as follows:

[0047] According to the above-mentioned ratio, each component is uniformly mixed to obtain a mixture;

[0048] Put the mixed material in the mold, and press at 2Mpa, 120°C for 250s to obtain a blank;

[0049] The pressed blank was heated and cured at 150° C. for 40...

Embodiment 3

[0051] The friction material provided in this example is composed of the following raw materials: 27g of steel fiber, 7g of boron-modified phenolic resin, 12g of phenolic resin, 4g of nitrile rubber powder, 13g of graphite, 7g of glass fiber, 7g of basalt fiber, 3g of barite, Aramid fiber 1.5g, calcium hydroxide 18g, silicon carbide 1.5g, aluminum oxide 3g.

[0052] Wherein, the aspect ratio of the steel fiber is 100:1, and its diameter is 0.04mm; the aspect ratio of the glass fiber is 400:1, and its diameter is 0.03mm; the aspect ratio of the basalt fiber is 400 : 1, its diameter is 0.04mm.

[0053] Synthetic brake shoes are prepared from the above-mentioned friction materials, and the preparation method is as follows:

[0054] According to the above-mentioned ratio, each component is uniformly mixed to obtain a mixture;

[0055]Put the mixture in the mold, and press it at 10Mpa, 120°C for 100s to obtain a blank;

[0056] The pressed blank was heated and cured at 250° C. f...

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Abstract

The invention relates to a friction material, a composite brake shoe and a preparation method, and relates to the technical field of brake shoe preparation. The friction material comprises the following raw materials in parts by weight: 25-30 parts of steel fibers, 5-8 parts of boron-modified phenolic resin, 10-15 parts of phenolic resin, 3-5 parts of nitrile rubber, 10-15 parts of graphite, 5-10parts of glass fibers, 5-10 parts of basalt fibers, 2-5 parts of barite, 1-2 parts of aramid fibers, 15-20 parts of calcium hydroxide, 1-2 parts of silicon carbide and 2-5 parts of aluminum oxide. With the proportion of the metal content in the formula and the synergistic effect of the raw materials, the hardness of the friction material is increased, the friction coefficient is reduced, the elasticity modulus is increased and the heat resistance is enhanced. The brake shoe prepared from the friction material has the characteristics of good heat resistance, low and stable friction coefficientand good impact resistance effect and can prevent transfer, adhesion, damage and scratch of the base material during braking of the brake shoe and can overcome the defects of brake shoe chipping / cracking, metal inserts and the like generated during frequent braking of large-scale road maintenance machinery.

Description

technical field [0001] The invention relates to the technical field of brake shoe preparation, in particular to a friction material, a synthetic brake shoe and a preparation method. Background technique [0002] In recent years, the Ministry of Railways of the People's Republic of China has continuously increased its investment in large-scale track maintenance machinery, which has formed a certain equipment scale for large-scale track maintenance machinery in my country's railways. By the end of the "Tenth Five-Year Plan", the whole road has accumulatively owned 34 line overhaul units, 71 line maintenance units, equipped with 589 large-scale road maintenance machines, and has the annual maintenance capacity of 40,400km and 5,440km of overhaul lines. The comprehensive operation scope of large-scale road maintenance machinery covers the busy trunk lines and speed-up lines of the whole road, forming a new production pattern with large-scale road maintenance machinery as the mai...

Claims

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Application Information

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IPC IPC(8): F16D69/02C09K3/14
CPCC09K3/14F16D69/028F16D2200/0021F16D2200/0034F16D2200/0052F16D2200/006F16D2200/0069F16D2200/0086
Inventor 吴佩芳释加才让李想钱钰升李君君解小花
Owner BEIJING TIANYISHANGJIA NEW MATERIAL
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