硅酸盐学报2021，Vol.49Issue(3)：461-468,8.DOI:10.14062/j.issn.0454-5648.20200461
TiB2对无压烧结B4C-TiB2复相陶瓷结构和性能的影响
Effects of TiB2 on Microstructure and Mechanical Properties of Pressure-less-sintered B4C-TiB2 Composites
李宗家 1程焕武 1王扬卫 2朱宇 1安瑞 2方海燕 1艾丽菲亚1
作者信息
- 1. 北京理工大学材料学院,北京100081
- 2. 冲击环境下材料技术重点实验室,北京100081
- 折叠
摘要
Abstract
Boron carbide matrix composites containing boron carbide(B4C),titanium diboride(TiB2)at 20％(mass fraction)and 30％,and titanium carbide(TiC)were fabricated at 2 130℃using a pressure-less sintering method.Different amounts of TiB2 and TiC particles were added to B4C.TiB2 content was chosen as the main variable to study the effect on the composites.The density,hardness,bending strengths and fracture toughness measurements were performed to obtain the physical and mechanical properties of the samples.The results indicate that by adding 30％TiB2 sub-micron particles at 2 130℃,the bending strength and fracture toughness of 277.6 MPa and 5.38 MPa·m1/2 were obtained for the composite.Particle pullout and crack micro-bridging play an effective role in toughening the composite ceramics.The main toughening mechanisms of the B4C-TiB2 composites are noted to possess microcrack and crack deflection toughening owing to the residual stresses resulting from the mismatch of the thermal expansion coefficient between TiB2 and B4C.关键词
无压烧结/碳化硼-硼化钛复相陶瓷/微观结构/力学性能Key words
pressure-less sintering/boron carbide-titanium diboride composites/microstructure/mechanical properties分类
化学化工引用本文复制引用
李宗家,程焕武,王扬卫,朱宇,安瑞,方海燕,艾丽菲亚..TiB2对无压烧结B4C-TiB2复相陶瓷结构和性能的影响[J].硅酸盐学报,2021,49(3):461-468,8.
