标题：Mechanical properties and microstructure of TiB2-TiC composite ceramic cutting tool material
作者：Zou, Bin; Huang, Chuanzhen; Song, Jinpeng; Liu, Ziye; Liu, Lin; Zhao, Yan
作者机构：[Zou, Bin] Shandong Univ, Sch Mech Engn, CaJET, Jinan 250061, Peoples R China.; Shandong Univ, Minist Educ, Key Lab High Efficiency & Clean Mech Mfg 更多
通讯作者地址：[Zou, B]Shandong Univ, Sch Mech Engn, CaJET, 17923 Jing Shi Rd, Jinan 250061, Peoples R China.
来源：INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
关键词：Ceramic cutting tool; TiB2-TiC-composite; Sintering conditions;; Mechanical properties; Microstructure
摘要：TiB2-TiC composite ceramic cutting tool material was prepared by sintering during hot-pressing in vacuum. The effects of nano-scale Ni and Mo additives and sintering heating rate on mechanical properties and grain characteristics were investigated. TiB2 and TiC grains exhibited prismatic and equiaxed shapes respectively. The diameter and aspect ratio of prismatic TiB2 grains were influenced by nano-scale Ni/Mo additives. A higher heating rate could cause a higher aspect ratio of prismatic TiB2 grains. The good mechanical properties of TN1((TiB2-TiC)/Ni composite ceramic sintered at a heating rate of 50 degrees C/min) were ascribed to a relatively fine and homogenous microstructure. And a brittle B4MoTi solid solution phase and wider distribution of grain size induced the lower flexural strength of TNM2((TiB2-TiC)/(Ni,Mo) composite ceramic sintered at heating rate of 100 degrees C/min), but the higher aspect ratio of TiB2 grains could prevent cracks from propagating and ameliorated the fracture toughness. The optimum resultant mechanical properties were obtained by (TiB2-TiC)/Ni composite ceramic sintered at a heating rate of 50 degrees C/min. (C) 2012 Elsevier Ltd. All rights reserved.