Cermet material based on TiCN-(Ti,M)CN core mixed structure and preparation method thereof

Abstract

The invention provides a cermet material based on a TiCN-(Ti,M)CN core mixed structure. The cermet material comprises a black core-bright inner ring-grey outer ring structure, a grey core-bright inner ring-grey outer ring structure, a bright core structure and Co or / and Ni adhesive phases, wherein in the black core-bright inner ring-grey outer ring structure, a black core is formed by TiCN; a bright inner ring and a grey outer ring are formed by (Ti,M)CN solid solutions; in the grey core-bright inner ring-grey outer ring structure, a grey core, a bright inner ring and a grey outer ring are formed by (Ti,M)CN solid solutions; the bright core structure is formed by a Co solid solution for dissolving M or / and a Ni solid solution for dissolving M; the M contents of the solid solutions for forming a bright core are more than the M content of the solid solution for forming the bright inner ring; the M content of the solid solution for forming the bright inner ring is more than the M content of the solid solution for forming the grey outer ring; and the M content of the solid solution for forming the grey outer ring is more than the M content of the solid solution for forming the grey core. The invention also provides a preparation method of the material. The toughness and hardness of the cermet material based on the TiCN-(Ti,M)CN core mixed structure are simultaneously improved.

Description

technical field

[0001] The invention belongs to the field of cermets, and in particular relates to a titanium carbonitride cermet and a preparation method thereof. Background technique

[0002] Ti(C,N)-based cermets have good red hardness, crater wear resistance and low manufacturing cost, and greatly reduce the use of strategic resources W, which is one of the best substitutes for WC-Co-based cemented carbide Therefore, it has become a ceramic material that the world's major industrial countries attach great importance to. Although the strength, hardness, and toughness of Ti(C,N)-based cermets have been improved by means of process optimization, modification treatment, and second phase strengthening, the commercial Ti(C,N)-based cermets The toughness is only 6~9MPa·m 1 / 2 , far inferior to the toughness of traditional WC-Co cemented carbide (9~16MPa m 1 / 2 ). Therefore, how to improve the toughness of Ti(C,N)-based cermets has become a widely concerned and researched issu...

Images