关键词: 弥散相；力学性能；微观结构；断裂方式

Abstract:

Aided at improving the hardness and bending strength of WC matrix composites,

Al₂O₃ dispersoids particles were incorporated into the composite and a new tool material WC-ZrO₂ was prepared by hot-press sintering.Meanwhile,certain amount of VC was added to the composite to suppress the grain growth to achieve great relative density.The hardness, bending strength and fracture toughness of the composite were tested.The effect of

Al₂O₃ dispersoids content on mechanical properties and microstructure of WC-ZrO₂composite materials were analyzed.Results show that it is great significance for the incorporation of

Al₂O₃
dispersoids to improve the mechanical properties and microstructure.

Key words: dispersoid;mechanical property;microstructure;fracture morphology