Ti(C,N) base metal ceramic and preparation method thereof

Abstract

The invention discloses Ti(C,N) base metal ceramic and a preparation method thereof. Raw materials of the metal ceramic comprise titanium carbonitride Ti(0.5 of C and 0.5 of N), tungsten carbide WC, molybdenum carbide / molybdenum Mo2C / Mo, niobium carbide NbC, vanadium carbide VC, cobalt Co and nickel Ni powder, wherein the content of NbC ranges from 3 wt% to 15 wt%, the VC content is 0.3-3%, and the VC content changes along with the content of NbC. Hard phases formed by the materials are of two core-ring structures, one structure is a ring-shaped phase structure containing typical black core phases and inner ring phases, or outer ring phases and black core phases, and the other structure is a ring-shaped phase structure containing white core phases. The total credit of the black core phasesin the ring-shaped phase structure containing the black core phases and the inner ring phases, or the outer ring phases and the black core phases is 10-20%, the total credit of the inner ring phasesis 0.5-2%, and the total credit of the white core phases in the ring-shaped structure containing the white core phases is 5-10%. Chemical components of some or all white core phases are different fromthose of the inner ring phases, and the content of the Nb element in some or all white core phases is 30-40 wt% higher than the content of the Nb element in the inner ring phases. The Ti(C,N) base metal ceramic has thermal shock resistant performance and cutting performance.

Description

technical field

[0001] The invention belongs to the field of cermets, and in particular relates to the composition design, preparation process and application of Ti(C,N)-based cermets with low cost and high cutting performance Background technique

[0002] Cermet is a type of composite material that uses ceramic powder and metal powder as raw materials, sinters at high temperature, and uses the metal phase to bond the ceramic phase into one. It combines the characteristics of hard ceramic phase and ductile metal phase with different mechanical properties, so that the material has high strength, high hardness and certain toughness, and is widely used in cutting tool materials and other wear-resistant parts. WC-Co cemented carbide is a typical representative material of cermet. In order to save global strategic resources such as tungsten and cobalt, Ti(C,N)-based cermets were invented in the 1930s, which are based on titanium carbide TiC, titanium nitride TiN or titanium carb...

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