Preparation method of surface self-lubricating ti(c,n) based cermet based on carbon migration

Abstract

The invention discloses a preparation method of self-lubricating surface Ti (C, N)-based metal ceramic based on carbon migration. The method is characterized by comprising the following steps: firstly performing heat preservation for 2 to 4h at 500 to 700 DEG C, so as to form a metal ceramic body with the porosity being 25 to 40 percent and a shaping agent being removed; then mixing a core / shell structure powder of amorphous Si-C-O coated TiH2, graphene with the thickness being smaller than 3nm, the number of layers being smaller than 3 and the specific surface area being greater than 250m2 / g, and Na2CO3 according to a weight percentage of 2:1:1, so as to a hydrogen-containing carburizing medium; embedding the metal ceramic body into the hydrogen-containing carburizing medium, and performing compaction at 5 to 15MPa; and finally performing liquid-phase sintering, so as to prepare the self-lubricating surface Ti (C, N)-based metal ceramic. The method solves the problems of serious crystal grain growth, long carburizing time and low efficiency in the prior art, and realizes the preparation of the self-lubricating surface Ti (C, N)-based metal ceramic during a sintering process.

Description

technical field

[0001] The invention relates to a method for preparing a cermet material, in particular to a method for preparing a surface self-lubricating Ti(C,N)-based cermet based on carbon migration, and belongs to the field of composite materials. Background technique

[0002] Ti(C,N) cermet has successfully replaced WC in many processing occasions due to its better red hardness, lower corrosion, thermal conductivity and friction coefficient, and better anti-sticking ability than WC-based cemented carbide. Carbide. Surface self-lubricating cermets can be prepared by surface carburizing, which can further improve their anti-friction and wear properties. CN94119863.4 discloses a carburizing method for ceramic materials. Ceramic (Al 2 o 3 , ZrO 2 Or oxide series) immersed in HF solution, in order to carry out surface treatment to 0.01μm ~ 100μm; put the above-mentioned surface-treated ceramic material into a quartz tube, and then transfer it to a carburizing furnace;...

Images