TiC crystal whisker-reinforced metal ceramic and preparation method thereof

Abstract

The invention discloses a TiC crystal whisker-reinforced metal ceramic and a preparation method thereof, belongs to metal ceramic and a preparation method thereof, and aims at improving bending strength and breaking tenacity of the existing Ti(C,N)-based metal ceramic. The TiC crystal whisker-reinforced metal ceramic disclosed by the invention is prepared from constituent material through ball-milling and mixing, TiC crystal whisker dispersing, drying and screening, die-forming, degreasing and vacuum-sintering, wherein a sintering tissue comprises a hard phase and a binding phase; the hard phase comprises two ceramic phases, and the binding phase is Ni-Mo-W sosoloid. The constituent materials comprise the following materials in percentage by weight: not less than 23% and not greater than 55.2% of Ti(C, N) powder, not less than 10% and not greater than 30% of TiC crystal whisker, not less than 6% and not greater than 10% of WC powder, not less than 8% and not greater than 15% of Mo powder, not less than 0.8% and not greater than 1.2% of C powder, not less than 20% and not greater than 32% of Ni powder. The TiC crystal whisker-reinforced metal ceramic prepared by the method disclosed by the invention has hardness capable of reaching 87.6 HRA-91.8 HRA, bending strength not less than 1920 MPa and breaking tenacity not less than 14.2MPa.m / 2, which are greatly improved, and has good popularization and application prospect in dry type cutting tools, hot-working dies, and the like.

Description

technical field

[0001] The invention belongs to cermets and a preparation method thereof, in particular to a TiC whisker-reinforced cermet and a preparation method thereof. Background technique

[0002] Ti(C,N)-based cermet is a new type of particle-reinforced composite material that appeared in the early 1970s. It has good high-temperature red hardness, wear resistance, thermal stability and anti-adhesion. Its low density makes it an ideal material for cutting tools and thermoforming dies. Industrially developed countries in the world attach great importance to the basic research of cermets and their product development, especially in Japan, where resources are scarce, and its cermet tools and molds have been popularized and applied in the fields of turning tools, milling cutters, drills, and gear hobs. my country started late in this area. So far, the popularization and application of commercial cermets is still very limited, mainly due to the low toughness and unstable p...

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