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Journal of Inorganic Materials

Journal of Inorganic Materials >

2007 , Vol. 22 >Issue 1: 106 - 112

DOI: https://doi.org/10.3724/SP.J.1077.2007.00106

Research Paper

Thermal Shock Resistance of Cobalt-coated Al2O3/TiC Composites Evaluated
by Indentation-quench Techniques

  • SHI Rui-Xia ,
  • LI Jia ,
  • WANG Dong-Zhi ,
  • YIN Yan-Sheng
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  • 1. School of Materials Science and Engineering of University of Jinan, Jinan 250022, China; 2. School of Materials Science and Engineering of Ocean University of China, Qingdao 266003, China

Received date: 2005-12-21

  Revised date: 2006-03-09

  Online published: 2007-01-20

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Abstract

The thermal shock resistance of Al2O3/TiC(AT) and cobalt-coated Al2O3/TiC(ATC) composites was measured by the indentation-quench technique. The experimental results show that cobalt-coated Al2O3/TiC composites exhibit better crack extension resistance and cyclic thermal shock resistance than Al2O3/TiC, and the critical temperature difference for ATC composites improved 25℃ compared with that of the AT composites. Calculated results of thermal shock resistance parameters R , R', RIV and Rst show that both the resistance to thermal shock fracture and thermal shock damage of ATC composites are better than those of AT. The thermal physic parameters are changed very little but the flexure strength and fracture toughness of ATC composites are improved greatly by introducing 3.96vol％ cobalt into AT composites using an electroless method, which contribute to the higher thermal shock parameters. In a word, the better thermal shock resistance should be attributed to the higher flexure strength and fracture toughness of ATC.

Key words： indentation-quench; thermal shock resistance; cobalt-coated Al2O3/TiC composites; thermal shock resistance parameters

Cite this article

SHI Rui-Xia , LI Jia , WANG Dong-Zhi , YIN Yan-Sheng . Thermal Shock Resistance of Cobalt-coated Al2O3/TiC Composites Evaluated
by Indentation-quench Techniques[J]. Journal of Inorganic Materials, 2007 , 22(1) : 106 -112 . DOI: 10.3724/SP.J.1077.2007.00106

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