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Effect of metallic content on mechanical property of Ni/(10NiO-NiFe2O4) cermets

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【作者】 李劼张刚叶绍龙赖延清田忠良孙小刚

【Author】 LI Jie, ZHANG Gang, YE Shao-long, LAI Yan-qing, TIAN Zhong-liang, SUN Xiao-gang(School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China)

【机构】 School of Metallurgical Science and Engineering Central South UniversitySchool of Metallurgical Science and EngineeringCentral South UniversityChangsha 410083China

【Abstract】 Ni/ (10NiO-NiFe2O4) cermets were fabricated by using cold pressing-sintering method. The phase composition and effect of metallic content on the mechanical properties such as bending strength, Vickers’ hardness, fracture toughness and thermal shock resistance were studied. The results show that the cermets consist of Ni, NiO and NiFe2O4. Within the range of metallic content from 0 to 17%(mass fraction), the relative density decreases with the increase of metallic content and the decrease of sintering temperature, Vickers’ hardness decreases from 7097MPa to 4814MPa and the bending strength increases from 110MPa to 157MPa, and the fracture toughness reaches the optimal value of 5.11MPa·m 1/2 at the metallic content of about 10%. The residual strength after thermal shock testing falls sharply as the thermal shock temperature difference is above 200℃.The cermets samples, whose metallic content is 10% and 15%, respectively, exhibit promising property of thermal shock resistance at 960℃ with six cycles of heating and quenching testing.

【基金】 Project(2005CB623703) supported by the National Key Fundamental Research and Development Programof China ;pro-ject (50474051) supported by the National Natural Science Foundation of China ;project (03JJY3080) supported by the Hunan ProvincialNatural Science Foundation
  • 【文献出处】 Journal of Central South University of Technology(English Edition) ,中南工业大学学报(英文版) , 编辑部邮箱 ,2006年04期
  • 【分类号】TG148
  • 【被引频次】2
  • 【下载频次】21
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