A high-conductivity dispersed copper-based high-temperature self-lubricating composite material and its preparation method

Abstract

The invention discloses a high-conductivity dispersed copper-based high-temperature self-lubricating composite. The high-conductivity dispersed copper-based high-temperature self-lubricating composite comprises oxygen-free copper powder and the following components of, by mass, 30%-50% of aluminum oxide dispersion copper powder, 0-2% of molybdenum disulfide powder and 6%-8% of graphite. When the temperature of the friction surface increases, the friction coefficient cannot decrease obviously, the recovery capability of reusing after cooling is high, the friction coefficient in each temperature range is kept between 0.130 and 0.140, a stable frictional characteristic is achieved, the characteristics of a low expansion coefficient, a high conductivity and heat conducting rate, high strength and toughness and the like are achieved, the anti-declining property is high, high-temperature lubrication, wear resistance and electrical conductivity can be achieved simultaneously, and the low friction coefficient and the low wearing capacity under the working condition of high speed sliding can be ensured by the self-lubricating composite, the self-lubricating composite is suitable for the fields of aviation, spaceflight, high speed railways, radar communication and the like, and particularly suitable for the fields of high speed railway pantograph pans, radar electric brushes, high speed printing elements and the like.

Description

technical field [0001] The invention belongs to powder metallurgy material technology, in particular to a high-conductivity dispersed copper-based high-temperature self-lubricating composite material and a preparation method thereof, which are applicable to the fields of aviation, aerospace, high-speed railway, radar communication and the like. Background technique [0002] With the progress and development of aviation, aerospace, high-speed railway, radar communication and other fields, high-speed and high-current electrified friction materials have been widely used, such as pantograph slides for high-speed trains, overhead conductor cores, and various conductive contacts. Brushes and conductive rings in radar confluence rings, gyroscopes of spacecraft, solar arrays, sealing rings of aerospace engines, etc. Due to the high-temperature working conditions and high-speed sliding process, the friction heat often exceeds 300°C, which puts forward higher requirements for high-tem...

AI Technical Summary

Problems solved by technology

Chen Xianhai and others proposed a friction material and an aircraft brake pad manufacturing process using the friction material (see CN 102604596A Chinese Patent Application Publication Document), using boron nitride (hBN), molybdenum disulfide and graphite as lubricating components, and the friction coefficient Keep it at 0.40 (room temperature to 600°C), but due to the splitting effect of boron nitride on the matrix structure, the mechanical properties are not high, and the hardness is only between 45 and 65HB

[0007] From the above studies, it can be seen that conventional copper-based composite materials are difficult to take into account high-temperature lubrication, wear resistance, and electrical conductivity, which greatly limits the application of some friction components in high-temperature, high-speed, and current-carrying conditions.

Images