Effects of laser processing parameters on solidification microstructures of ternary Al2O3/YAG/ZrO2 eutectic in situ composite and its thermal property

来源期刊:中国有色金属学报(英文版)2009年第6期

论文作者:SU Hai-jun 张军 刘林 傅恒志

文章页码:1533 - 1538

Key words:Al2O3/YAG/ZrO2; eutectic in situ composite; ceramic; microstructure; laser resolidification

Abstract: Rapid surface resolidification with a high powered CO2-laser was performed in preparing directionally solidified Al2O3/YAG/ZrO2 ternary eutectic ceramic in situ composite. The effects of laser processing parameters on the solidification microstructure characteristics and thermal properties were studied by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffractometry (XRD) and synthetically thermal analysis (STA). Detailed investigations of the influence of laser power and scanning rate on the preparation and microstructural parameters of the ternary eutectic were presented. Moreover, the eutectic phase separation rule at high temperature was discussed. The results indicate that solidification microstructure of the ternary eutectic composite is greatly influenced by the laser processing parameters. The synthetically thermal analysis shows that the eutectic temperature of ternary Al2O3/YAG/ZrO2 composite is 1 738 ℃, well matching the phase diagram of Al2O3-Y2O3-ZrO2.

基金信息:the National Natural Science Foundation of China
the Aeronautical Science Foundation of China
the Specialized Research Fund for the Doctoral Program of Higher Education of China
the Foundation Research Fund of Northwestern Polytechnical University, China
the Opening Project of State Key Laboratory for Advanced Metals and Materials, China

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