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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

B4C-TiB2复相陶瓷的强韧化研究

唐军; 谭寿洪; 陈忠明; 江东亮   

  1. 中国科学院上海硅酸盐研究所; 上海200050
  • 收稿日期:1996-01-03 修回日期:1996-04-18 出版日期:1997-04-20 网络出版日期:1997-04-20

Strengthening and Toughening of B4C-TiB2 Multiphase Ceramics

TANG Jun; TAN Shouhong; CHEN Zhongming; JIANG Dongliang   

  1. Shanghai Institute of Ceramics; Chinese Academy of Sciences Shanghai 200050 China
  • Received:1996-01-03 Revised:1996-04-18 Published:1997-04-20 Online:1997-04-20

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摘要： 采用热压烧结工艺，制备了B4C－TiB2复相陶瓷．结果表明，复相陶瓷的抗弯强度、断裂韧性和显微硬度受第二相Tib2颗粒的影响．其中B4C－30vol％TiB2材料的弯曲强度为725MPa，比单体B4C提高65％，B4C－45vol％ThB2材料的断裂韧性为6.7MPa.M1/2，比单体B4C提高84％，由B4C基体和TiB2颗粒热膨胀系数不匹配导致的残余应力是B4C－TiB2复相陶补强增韧的主要原因．

关键词: B4C, TiB2, 补强增韧, 裂纹偏转

Abstract: B4C-TiB2 composites were prepared by hot-pressing process at 2050°C. The effects of TiB2 particlecontent on the fracture toughness, bending strength and Vickers hardness of B4C-TiB2 composites werestudied. The addition of 3Ovol% TiB2 raised the bending strength of B4C to the peak value of 725MPa, 65%higher than monolithic B4C. An 84% increase of composite toughness up to 6.7MP.m1/2 was discoveredupon the incorporation of 45vol% TiB2 particles into B4C matrix. The crack deflection caused by theresidual stress resulting from the difference in thermal expansion coefficient between B4C and TiB2 is the main mechanism responsible for the increase of toughness.

Key words: B4C, TiB2, strengthening and toughening, crack deflection