东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2011, Vol. 32 ›› Issue (11): 1578-1582.DOI: -

• 论著 • 上一篇    下一篇

原位合成TiB_2颗粒增韧SiC的显微组织与断裂韧性

王伟;连景宝;岳新艳;茹红强;   

  1. 东北大学材料与冶金学院;
  • 收稿日期:2013-06-19 修回日期:2013-06-19 发布日期:2013-04-04
  • 通讯作者: -
  • 作者简介:-
  • 基金资助:
    国家高技术科技研究发展计划项目(2009AA03250);;

In-situ synthesized TiB2 toughened SiC microstructures and fracture toughness

Wang, Wei (1); Lian, Jing-Bao (1); Yue, Xin-Yan (1); Ru, Hong-Qiang (1)   

  1. (1) School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China
  • Received:2013-06-19 Revised:2013-06-19 Published:2013-04-04
  • Contact: Ru, H.-Q.
  • About author:-
  • Supported by:
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摘要： 在前期对原位生成TiB2增韧SiC制备工艺研究的基础上,研究了TiB2/SiC复合陶瓷的显微组织与力学性能.研究发现:在φ(TiB2)介于5%~20%时,原位生成的TiB2相在SiC基体中的分布都比较均匀;当φ(TiB2)为5%和20%时,TiB2颗粒等面积圆直径平均值分别为2.6和3.9μm;另外,TiB2颗粒能起到明显细化SiC晶粒的作用.随着φ(TiB2)的增加,TiB2/SiC复合材料的相对密度、维氏硬度和断裂韧性均增大.当φ(TiB2)为20%时,复合材料相对密度、维氏硬度和断裂韧性分别为94.8%,29.1 GPa和5.9 MPa.m1/2.经优化工艺制备的TiB2/SiC复合陶瓷...

关键词: 原位合成, 硼化钛, 碳化硅, 断裂韧性

Abstract: Based on the previous work dealing with the process conditions of in-situ synthesized TiB2 particles reinforced SiC by pressureless sintering method, the microstructures and the mechanical properties of obtained TiB2/SiC ceramic composites were studied. It was found that the TiB2 particles distribute homogeneously in the SiC matrix with φ(TiB2) ranged from 5% to 20%. The equivalent-area circle diameters of TiB2 particles in ceramic composites with φ(TiB2) of 5% and 20% are 2.6 μm and 3.9 μm, respectively. Moreover, the introduction of TiB2 phases can suppress the growth of the SiC grains during the sintering. The relative density, Vicker's hardness and fracture toughness of obtained TiB2/SiC increase with the increase of the φ(TiB2). For TiB2/SiC composite with φ(TiB2) of 20%, the relative density, Vicker's hardness and fracture toughness are 94.8%, 29.1 GPa, 5.9 MPa·m1/2, respectively. Under optimized process conditions, the fracture toughness of TiB2/SiC ceramic composite reaches up to 6.3 MPa·m1/2.

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