PREPARATION OF Al2O3 / SiC/ Ni/ Al-Si CERAMIC MATRIX COMPOSITES WITHMULTI2PHASE VAGUE INTERFACE BY OXIDATION OF MOLTEN ALUMINUM ALLOYS
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摘要: 针对Al2O3 / Al 复合材料中金属相Al 对其高温性能的不利影响, 本试验在高温下将铝合金熔体氧化渗透到注浆成型的SiC/ Ni 多孔预制体中, 制备了Al2O3 / SiC/ Ni/ Al-Si 多相陶瓷基复合材料。借助光学显微镜、电子显微镜(SEM) 、X 射线衍射仪(XRD) 、波谱仪( EDS) 等手段分析了预制体和复合材料的相组成、微观结构及界面特征。结果表明, 复合材料的主晶相为Al2O3 与SiC , 相间存在Al (Si) 复合氧化物、NiAl2O4 及Ni 与Al-Si 合金相, 各相界面处成分呈连续过渡变化趋势, 构筑了具有模糊界面特征的多相复合材料。Abstract: For metal phase Al in Al2O3 / Al composite is harmful to it s high temperature property , Al2O3 / SiC/ Ni/Al-Si multi-phase ceramic mat rix composites were synthesized by oxidizing and infilt rating Al-5Zn-10Si alloy meltinto SiC/ Ni porous preforms made by slip casting at high temperature. The phase composition , microst ructure andinterface characteristic of composites were investigated using optical microscope , XRD , SEM , EDS , etc. The result s show that the main phases of the composites are Al2O3 and SiC , while Al (Si) compound oxide , NiAl2O4 , Niand Al2Si alloy phase exist at the phase interface of Al2O3 or SiC. The compositions in different phase interfaces arecontinuous variety , which brings into being a multi-phase composites with vague-interface.
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Key words:
- composites /
- vague-interface /
- melt oxidation /
- SiC
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