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原位生成TiB2颗粒增韧B4C陶瓷的研究

唐军, 谭寿洪, 陈忠明, 江东亮

唐军, 谭寿洪, 陈忠明, 江东亮. 原位生成TiB2颗粒增韧B4C陶瓷的研究[J]. 粉末冶金技术, 1996, 14(3): 168-174.
引用本文: 唐军, 谭寿洪, 陈忠明, 江东亮. 原位生成TiB2颗粒增韧B4C陶瓷的研究[J]. 粉末冶金技术, 1996, 14(3): 168-174.
Tang Jun, Tan Shouhong, Chen Zhongming, Jiang Dongliang. TOUGHENING B4C CERAMICS BY TiB2 PARTICLES PRODUCED IN SITU B4C[J]. Powder Metallurgy Technology, 1996, 14(3): 168-174.
Citation: Tang Jun, Tan Shouhong, Chen Zhongming, Jiang Dongliang. TOUGHENING B4C CERAMICS BY TiB2 PARTICLES PRODUCED IN SITU B4C[J]. Powder Metallurgy Technology, 1996, 14(3): 168-174.

原位生成TiB2颗粒增韧B4C陶瓷的研究

详细信息
    作者简介:

    唐军,1993年毕业于北京科技大学,现为在读硕士研究生,从事高温结构肉瓷的研究工作。

TOUGHENING B4C CERAMICS BY TiB2 PARTICLES PRODUCED IN SITU B4C

  • 摘要: 通过TiC与B4C的化学反应,在B4C基体内原位生成TiB2颗粒,获得的TiB2颗粒粒径一般在3μm以下。其中加入20vol%TiC(对应的TiB2为35vol%)的复相陶瓷的断裂韧性值KIC达6.3MPa·m1/2,比单体B4C提高75%,加入10vol%TiC(对应的TiB2为14vol%)的复相陶瓷的抗弯强度达到最大值620MPa,比单体B4C提高40%。由B4C和TiB2颗粒之间热膨胀系数不匹配产生残余应力而引起的裂纹偏转和微裂纹增韧是主要的增韧机理,反应生成的碳对材料的强度和显微硬度有不良影响。
    Abstract: Fine TiB2 particles are produced in situ-B4C through reaction of B4C + 2TiC=2TiB2+3C and B4C-based composites are prepared by hot-press process at 2050℃. The composite derived from B4C-20vol% TiC has a peak KIC value of 6.3MPa·m1/2,which is higher than that of monolithic B4C by 75%. The material resulting from B4C-10vol%TiC enjoys a maximal bending strenght of 620MPa,which is 40% higher than that of monolithic B4C. The crack denection and microcrack toughening caused by the residual stress resulting from the difference in thermal expansion coefficient between B4C and TiB2 are the main toughening mechanisms. The carbon derived from the reaction is one reason for the decrease in bending strength and Vickers hardness.
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出版历程
  • 收稿日期:  1996-01-18
  • 网络出版日期:  2021-08-03

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