Effect of metallic content on mechanical property of Ni/(10NiO-NiFe₂O₄) cermets^①

来源期刊：中南大学学报(英文版)2006年第4期

论文作者：李劼 张刚 叶绍龙 赖延清 田忠良 孙小刚

文章页码：347 - 352

Key words：aluminum electrolysis; inert anode; NiFe₂O₄; fracture toughness; thermal shock resistance

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^1/2at 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.

基金信息：the National Key Fundamental Research and Development Program of China
the National Natural Science Foundation of China