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...

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Problems solved by technology

The patent application with the application number of 200510090485.9 discloses "solid solution powder, ceramics, cermet powder, cermet and preparation method", and uses the synthesized (Ti, W, Mo...) (C, N) solid solution powder to press and sinter to obtain fracture The toughness is 12~13MPa·m 1 / 2 TiCN-based cermets without core rings, but their hardness is only 11-12GPa, which is much lower than the hardness level of commercial Ti(C,N)-based cermets of 14-17GPa.

Yu Haijun of Sichuan University et al. (Effect of secondary carbides addition on the microstructure and mechanical properties of(Ti,W,Mo,V)(C,N)-based cermets.Int.Journal of Refractory metals and Hard Materials,2011(29 ):586-590) is based on (Ti, W, Mo...) (C, N) solid solution powder, by adding carbides to form gray core gray ring and bright core gray ring structure to improve the performance of the material, although it can make The hardness of the material reaches about 1650MPa, but the toughness drops significantly and can only reach 10MPa m 1 / 2

[0004] In summary, the existing technology cannot take into account both toughness and hardness in improving the properties of Ti(C,N)-based cermets, and the two properties cannot be improved at the same time, thus limiting the application of this type of cermets

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