Quaternary MAX phase reinforced NiAl-based high-temperature lubricating composite and preparation method thereof

Abstract

The invention discloses a quaternary MAX phase reinforced NiAl-based high-temperature lubricating composite and a preparation method thereof. The preparation method comprises the following steps of respectively weighing NiAl powders, Mo podwers, Ti powders, Al powders and C powders in proportion, and then putting the weighed powders into a high-energy ball mill for ball milling to prepare nano-structure mixed powders uniformly mixed; and putting the mixed powders into a graphite grinding tool for cold pressing treatment, and carrying out vacuum hot pressing sintering in a vacuum hot pressing sintering furnace after cold pressing is finished to obtain the NiAl-Mo2TiAlC2 composite. According to the quaternary MAX phase reinforced NiAl-based high-temperature lubricating composite and the preparation method thereof, a novel quaternary MAX phase (Mo2TiAlC2) is generated by the in-situ reaction of Mo, Ti, Al and C in the sintering process, so that the high-temperature lubricating performanceof the composite is achieved, and the wettability between the MAX phase and a NiAl matrix and the structure of the composite are effectively improved at the same time, therefore, the strength of thecomposite is effectively improved, and the excellent lubricating performance of the composite under the condition of higher temperature is achieved.

Description

technical field [0001] The invention belongs to the technical field of high-temperature high-strength lubricating composite materials, and in particular relates to a quaternary MAX phase-reinforced NiAl-based high-temperature lubricating composite material and a preparation method thereof. Background technique [0002] In recent years, my country's aerospace, nuclear industry and other high-tech industries have developed rapidly, and high-temperature moving parts in these fields also have serious friction and wear problems, which will seriously affect the reliability and stability of the entire equipment operation, and further affect The service life of the entire equipment. Therefore, it is urgent to use the basic knowledge of materials science and tribology theory to design and construct a high-temperature lubricating composite material with excellent friction and wear properties at higher temperatures to meet the rapid development of my country's aerospace, nuclear industr...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a quaternary MAX phase reinforced NiAl-based high-temperature lubricating composite material and its preparation method in view of the above-mentioned deficiencies in the prior art, using Mo, Ti, Al, C powder in the high-temperature sintering process in situ reaction to generate a new type of quaternary Mo 2 TiAlC 2 phase, its mechanical properties and high-temperature lubricity are better than those of the traditional ternary MAX phase, which can further improve the high-temperature lubricity of the composite material, and this in-situ reaction can effectively improve the poor wettability between the quaternary MAX phase and the NiAl matrix. problem, increasing the strength of composites

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