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Frictional material and preparation method and purpose thereof

A technology of friction materials and raw materials, applied in friction linings, mechanical equipment, gear transmission mechanisms, etc., can solve the problems of poor material stability and consistency, improve the stability of friction coefficient, improve density, and ensure the stability of friction coefficient sexual effect

Active Publication Date: 2020-04-17
BEIJING TIANRENDAOHE NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem of poor material stability and consistency caused by pressure unloading during the cooling process of the existing copper-based powder metallurgy friction material after high temperature and high pressure sintering, and to provide a friction material and its preparation method and use

Method used

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  • Frictional material and preparation method and purpose thereof
  • Frictional material and preparation method and purpose thereof
  • Frictional material and preparation method and purpose thereof

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preparation example Construction

[0049] The invention provides a method for preparing a friction material, which comprises the steps of batching, mixing, pressing and sintering the raw materials of the friction material in sequence, and the sintering step includes the following steps:

[0050] 1) In an atmosphere of hydrogen and / or nitrogen, heat the friction material compact at 950-1050°C and 2-4MPa for 15-30min once;

[0051] 2) After the first heat preservation is completed, the temperature of the friction material compact is lowered to 750-850°C at 2-4MPa, and a second heat preservation is carried out at 2-4MPa, 750-850°C for 15-30min;

[0052] 3) After the second heat preservation is completed, the temperature of the friction material compact is lowered to 550-650°C at 2-4MPa, and three heat preservations are carried out at 2-4MPa, 550-650°C for 15-30min;

[0053] 4) After three times of heat preservation, the pressure is released, and the friction material compact is cooled to room temperature to obtain...

Embodiment 1

[0092] This embodiment provides a friction material, which includes the following raw materials: 55 kg of copper powder, 28 kg of iron powder, 6 kg of ferrochrome powder, 6 kg of graphite, 2 kg of silicon dioxide, 1.5 kg of molybdenum disulfide, 1 kg of cast iron powder, zirconium corundum 2kg, the mass content of zirconium dioxide in the zirconium corundum is 8%.

[0093] The preparation method of the friction material comprises the following steps:

[0094] (1) batching: take described raw material respectively by above-mentioned proportioning;

[0095] (2) Mixing: mixing the weighed raw materials to obtain the friction material mixture;

[0096] (3) Pressing: pressing the friction material mixture into a compact to obtain a friction material compact, the pressing pressure is 6 MPa, and the pressing time is 5 s;

[0097] (4) sintering: the sintering step comprises the following steps:

[0098] 1) Under the atmosphere of hydrogen and nitrogen, heat the friction material co...

Embodiment 2

[0103] This embodiment provides a friction material, which includes the following raw materials: 60 kg of copper powder, 22 kg of iron powder, 8 kg of ferrochrome powder, 4 kg of graphite, 4 kg of silicon dioxide, 0.5 kg of molybdenum disulfide, 2 kg of cast iron powder, zirconium corundum 1 kg, the mass content of zirconium dioxide in the zirconium corundum is 12%.

[0104] The preparation method of the friction material comprises the following steps:

[0105] (1) batching: take described raw material respectively by above-mentioned proportioning;

[0106] (2) Mixing: mixing the weighed raw materials to obtain the friction material mixture;

[0107] (3) Pressing: pressing the friction material mixture into a compact to obtain a friction material compact, the pressing pressure is 15MPa, and the pressing time is 3s;

[0108] (4) sintering: the sintering step comprises the following steps:

[0109] 1) In an atmosphere of hydrogen and nitrogen, heat the friction material compa...

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Abstract

The invention relates to the technical field of braking materials, in particular to a frictional material and a preparation method and purpose thereof. The preparation method of the frictional material comprises the steps of sequentially carrying out dosing, mixing, pressing and sintering on raw materials of the friction material. The sintering step comprises the following steps that firstly, at the atmosphere of hydrogen and / or nitrogen, a frictional material press blank is subjected to primary heat preservation for 15-30 min at the temperature of 950-1050 DEG C and under 2-4 MPa; secondly, the frictional material press blank is cooled to 750-850 DEG C under 2-4 MPa, and secondary heat preservation is carried out for 15-30 min; thirdly, the frictional material press blank is cooled to 550-650 DEG C under 2-4 MPa, and heat preservation of the third time is carried out for 15-30 min; and fourthly, after heat preservation of the third time is finished, pressure is relieved, cooling is carried out to the room temperature, and the frictional material is obtained. The preparation method of the frictional material can effectively avoid the problem that on the high-temperature condition,due to pressure relief, the frictional material expands, and thus uniformity of friction coefficients of the material gets poor.

Description

technical field [0001] The invention relates to the technical field of brake materials, in particular to a friction material and its preparation method and application. Background technique [0002] Friction materials are the key materials for friction brakes and clutches in aviation, vehicles, machinery, etc. With the development of science and technology, the power, speed and load of the machine are increasing day by day, and the working conditions are becoming more and more severe. Therefore, higher requirements are put forward for the comprehensive performance of friction materials, that is, in addition to the requirements of good wear resistance, high strength, In addition to good thermal conductivity, corrosion resistance, and low noise, it also has a stable friction coefficient to keep the vehicle stable at high speed and high pressure. [0003] Existing friction materials generally include asbestos type, semi-metal type, and ceramic type. Asbestos-type friction mat...

Claims

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Application Information

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IPC IPC(8): B22F5/00B22F1/00B22F3/10B22F3/14C22C9/00F16D69/02
CPCB22F1/0003B22F5/00B22F3/14B22F3/1007B22F3/1028C22C9/00F16D69/027F16D2200/0026F16D2200/0082B22F2998/10B22F2999/00B22F2009/041B22F2201/013B22F2201/02
Inventor 吴佩芳释加才让赵尚节曹静武程景琳马成龙
Owner BEIJING TIANRENDAOHE NEW MATERIAL CO LTD
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