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Transactions of Materials and Heat Treatment. 2011, (S1) Core

Nanostructured ceramic composite coating synthesized by plasma spraying Al-Fe2O3 composite powdersChinese Full Text

YANG Yong,YAN Dian-ran,DONG Yan-chun,WANG Lei,CHEN Xue-guang,ZHANG Jian-xin,HE Ji-ning,YUAN Li-wu,ZHANG Lei(School of Materials Science and Engineering,Hebei University of Technology,Tianjin 300132,China)

Abstract: Plasma spraying Al-Fe2O3 composite powders was employed for synthesizing composite coating.The microstructure of the as-prepared coating was characterized by X-ray diffraction,scanning electron microscopy and transmission electron microscopy.The adhesive strength,microhardness,toughness and wear resistance of the as-prepared coating were evaluated.The results show that FeAl2O4,α-Fe and γ-Al2O3 phases are formed during the plasma spraying process due to the thermite reaction of Al-Fe2O3 composite powders.TEM results revealed that the composite coating has nanostructured microstructure.In the composite coating,spherical α-Fe grains and γ-Al2O3 grains（tens of nanometers to hundreds of nanometers） are distributed uniformly within the equiaxed and columnar nano-sized FeAl2O4 matrix.The adhesive strength,toughness and wear resistance of the composite coating are significantly enhanced compared with the conventional micro-sized Al2O3 coating,which are attributed to the nanostructure of the composite coating and the inclusion of metallic phase α-Fe in the composite coating.
Keywords：

plasma spraying; ceramic matrix composite; nanostructured coating; thermite reaction;

  • DOI：

    10.13289/j.issn.1009-6264.2011.s1.039

  • Series：

  • Subject：

  • Classification Code：

    TG174.44

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