High-temperature alloy base self-lubricating composite material and surface pattern treatment method thereof

Abstract

A kind of high temperature alloy group self-lubricating compound material and the method to pattern surface of it. The components and the mass percent of them are as following: Ni: 28.8-56.8%, Fe: 10.0-30.0%, Cr: 7.2-14.2%, W: 5.0- 15.0%, C: 3.0-6.0%, Si: 0.8%-1.2%, MoS2: 5.0%-15.0%. The method to pattern it' s surface contains the following steps: The surface of the nickel chromium alloy group self-lubricating compound material sample after being hot pressed and mould will be polished. A gammaray laser will be used to corrase micropore on the surface, the focus of the focusing lens will be adjusted to 40-60mm, the facula diameter at the focus is 0.15- 0.20mm, the impulse duration will be adjusted to 450-500ns, the laser bean will process micropore according to ring shape from outside to inside. The surface after being corrased and polished will be lubricated by daubing the fat of solid layered dry lubricant. The alloy group material not only owns high mechanical strength but also owns high temperature self-lubricating ability. The coefficient of friction can be decreased, the application life can be prolonged, and low attrition abrasion in wide temperature range can also be realized by patterning the surface.

Description

technical field [0001] The invention belongs to the self-lubricating composite material and its surface modification technology, which is used to solve the lubrication problem of space mechanical bearings and sealing parts that cannot be lubricated by grease under harsh conditions such as high temperature and high pressure, especially a high-temperature alloy-based self-lubricating composite material and a surface patterning treatment method thereof. Background technique [0002] The development of high and new technologies such as aviation, aerospace, nuclear energy, etc. has put forward higher requirements for high-temperature performance and high-temperature lubrication of materials. For example, the working temperature of adiabatic diesel engine bearing liners reaches 600-1000 °C. Ordinary lubricating grease is no longer applicable. Solid lubricants, such as some metal sulfides, oxides, soft metals, etc., can withstand high temperatures and reduce wear. Therefore, the us...

AI Technical Summary

Problems solved by technology

At present, the patterning treatment method is mainly used in mechanical seals to improve the lubrication state of end seals under elastohydrodynamic lubrication conditions, and is rarely used in solid lubrication applications, especially high temperature solid lubrication applications

[0005] The patent CN1586770 published in 2005 prepared self-lubricating materials by compounding solid lubricating particles into a metal matrix. The sintered matrix has sweat gland-like micropores of 0.05-8 μm, and solid lubricant particles are compounded in sweat gland-like micropores. The lubricant in the medium diffuses to the friction surface to achieve the purpose of high temperature self-lubrication. This method is difficult to realize the design and accurate control of the shape and distribution of the micropores, so it is difficult to predict the degree of improvement of the micropores to the lubrication state.