Study on the preparation and properties of Ti(C, N)-based cermet with double-core ring structure

The solid phase chemical reaction and the carbothermal reduction-nitridation method were combined to prepare the(W, Mo, Ta)(C, N) powders, using the heavy metal elements as W, Mo, and Ta. The(W, Mo, Ta)(C, N) powders and Ti(C, N)-based ceramic powders were mixed by high-energy ball milling. Then, the Ti(C, N)-based cermet with a double-core ring structure was obtained by pressing formation and low pressure sintering. The effect of double-core ring structure on the microstructures and mechanical properties of Ti(C, N)-based cermet was investigated by X-ray diffraction and scanning electron microscopy. The results show that, the double-core ring structure formed by the Ostwald dissolution-precipitation mechanism during the high-temperature sintering process can prevent cracks from extending, which leads to the excellent toughness performance. The toughness of Ti(C, N)-based cermet can be improved by optimizing the core ring structure of the cermet material.