A low-modulus self-lubricating titanium-based composite material and preparation method thereof

Abstract

The invention discloses a low-modulus self-lubricating titanium-based composite material and a preparation method thereof. The structure of the titanium-based composite material consists of a matrix phase and an in-situ self-lubricating phase, wherein the matrix phase is β-Ti and the in-situ self-lubricating phase is Mo. 4.8 Si3C6 and Ti5Si3, the preparation method is: (1) titanium-based powder, MoC, Si and TiH2 are mixed and ball-milled to obtain a powder of a composite material; (2) the powder of the composite material is spread on a substrate of a selective laser melting device, and selective laser melting is performed to obtain. The present invention uses titanium-based powder, MoC, Si and TiH2 as raw materials to prepare a titanium-based composite material through a selective laser melting process. During the melting process, TiH2 is decomposed into hydrogen to provide a reducing atmosphere, and MoC is decomposed into Mo and C, wherein Mo is solid-dissolved into the titanium-based powder to form a low-modulus β-Ti matrix phase to reduce the elastic modulus and "stress shielding" effect of the material; the titanium-based powder, Mo, Si, and C react in situ to form a self-lubricating phase Mo 4.8 Si3C6 and Ti5Si3 can reduce the wear of titanium-based materials during application, thereby increasing their service life.

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