标题：Study on in-situ synthesis of ZrB2 whiskers in ZrB2-ZrC matrix powder for ceramic cutting tools
作者：Xu, Liang; Huang, Chuanzhen; Liu, Hanlian; Zou, Bin; Zhu, Hongtao; Zhao, Guolong; Wang, Jun
作者机构：[Huang, Chuanzhen] Shandong Univ, Sch Mech Engn, Ctr Adv Jet Engn Technol CaJET, Jinan 250061, Shandong, Peoples R China.; Shandong Univ, Minist Edu 更多
通讯作者地址：[Huang, CZ]Shandong Univ, Sch Mech Engn, Ctr Adv Jet Engn Technol CaJET, Jinan 250061, Shandong, Peoples R China.
来源：INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
关键词：ZrB2 whisker; In-situ synthesis; Ceramic cutting tools; Growth; mechanism; ZrB2-ZrC matrix
摘要：The composite powder of ZrB2 whisker-toughened ZrB2-ZrC matrix ceramic tool materials was synthesized by in-situ synthesis process combined with the carbothermal reduction method. The product contained ZrB2 as the major phase and ZrC/Ni2B as the minor phases. When increasing the synthesis temperature from 1400 degrees C to 1700 degrees C, the lattice parameters of ZrB2 (a and c) decreased linearly, meanwhile, ZrC exhibited a non-stoichiometric property through the variation of the lattice parameter. The ZrB2 whiskers showed an aspect ratio of 10-30 and a diameter of 1-3 mu m. The agglomeration of the ZrB2-ZrC matrix powder and the morphology of bonding particles in the whiskers were also observed. The solid-liquid-solid (S-L-S) mechanism and the anisotropic Ostwald ripening were found to govern the growth of the ZrB2 whiskers during the in-situ synthesis process. (C) 2012 Elsevier Ltd. All rights reserved.