Effect of High-Energy Ball Milling of ZrB2 Powder on the Microstructure and Mechanical Properties of ZrB2-SiC Ceramics
The sinterability of ZrB2-20vol.% SiC ceramics by high-energy ball milling as well as introduction of Zr and Al as sintering additives.Densification process and microstructure of ZrB2-SiC ceramics were investigated.After high-energy ball milling,the average particle size decreased to about 500 nm-2 μm,and ZrB2-SiC powder can be sintered to 98.92% theoretical density at 1800 ℃,but a trace of amount of oxidation (ZrO2) were detected in sintered sample.Introduction of Zr,Al and C combined with high-energy ball milling enhanced the densification of ZrB2-SiC ceramics and reduced the particle sizes,and the relative density of obtained ceramic reached up to 99.49% at 1800 ℃.The additions of Zr,Al and C can remove the oxide impurities of the surface of ZrB2 particles and form a reaction between oxide impurities.The fracture toughness increased of the 40% when ZrB2 powders were milled by high-energy ball milling,and increased to 4.77±0.18 MPa·m1/2.However,the attrition-milled composites had lower hardness and Youngs modulus,which was attributed to the presence of a second phase in the grain boundaries.
ZrB2-SiC microstructure high-energy ball milling mechanical properties
Qilong GUO Junguo LI Qiang SHEN Lianmeng ZHANG
State Key Lab of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,P.R.China
国际会议
The Seventh China International Conference on High-Performance Ceramics (第七届先进陶瓷国际研讨会(CICC-7))
厦门
英文
723-728
2011-11-04（万方平台首次上网日期，不代表论文的发表时间）