标题：Al2O3-coated h-BN composite powders and as-prepared Si3N4-based self-lubricating ceramic cutting tool material
作者：Zhang, Wenliang; Yi, Mingdong; Xiao, Guangchun; Ma, Jun; Wu, Guangyong; Xu, Chonghai
作者机构：[Zhang, Wenliang; Yi, Mingdong; Xiao, Guangchun; Ma, Jun; Wu, Guangyong; Xu, Chonghai] Qilu Univ Technol, Sch Mech & Automot Engn, Jinan 250353, Shand 更多
通讯作者地址：[Xu, CH]Qilu Univ Technol, Sch Mech & Automot Engn, Jinan 250353, Shandong, Peoples R China.
来源：INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
关键词：Surface coating modification; Heterogeneous nucleation process;; Self-lubricating; Si3N4 ceramic cutting tool
摘要：The surfaces of solid lubricant hexagonal boron nitride (h-BN) powders were coated with compacted and integrated Al(OH)(3) by heterogeneous nucleation and then the h-BN@Al2O3 composite powders were prepared by calcination under vacuum at 1200 degrees C for 2 h, as determined by SEM, EDS and XRD. The Si3N4 self-lubricating ceramic cutting tool material with coated h-BN was prepared by vacuum hot pressing. Microstructure analysis showed that the h-BN@Al2O3 particles were dispersed homogeneously in the matrix and that the particles were tightly bound. Vickers hardness was 14.1 GPa, fracture toughness was 7.2 MPa.m(1/2), and flexural strength was 732 MPa, as determined by mechanical property testing. The hardness, fracture toughness, and flexural strength of the material were increased by 27.0%, 5.9% and 22.2%, respectively, relative to the material to which un-coated h-BN was added. Cutting tests showed that the Si3N4/TiC/(h-BN@Al2O3) self-lubricating ceramic cutting tool had better antifriction property and wear resistance than the corresponding cutting tool.