PREPARATION OF Al₂O₃ / SiC/ Ni/ Al-Si CERAMIC MATRIX COMPOSITES WITHMULTI2PHASE VAGUE INTERFACE BY OXIDATION OF MOLTEN ALUMINUM ALLOYS

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.