SiC颗粒粒度对熔铝氧化渗透合成SiC_p/Al_2O_3-Al复合材料微观断裂机制的影响

Effect of SiC Particle Size on Micro-fracture Mechanism of SiC_p/ Al_2O_3-Al Composites Synthesized by Oxidative Infiltration of Al Melt

首次采用 X光电子谱仪 ( XPS)对熔铝氧化渗透合成的 Si Cp/Al2 O3- Al复合材料断口表面进行定量相分析 ,并通过与金相分析所确定的材料中各对应相含量一一进行对比 ,进而确定出裂纹穿过各组成相的优先程度 ,实现了该多元复合材料微观断裂机制的定量表征。研究结果证实 :Si C颗粒粒度对该材料的微观断裂机制有着至关重要的影响。室温及高温的力学性能测试结果表明 ,根据微观断裂机制优化出的 Si C颗粒粒度为 1 0 μm的 Al2 O3- Al基复合材料 ,其力学性能总体水平优于国外同类产品。首次采用 X光电子谱仪 ( XPS)对熔铝氧化渗透合成的 Si Cp/Al2 O3- Al复合材料断口表面进行定量相分析 ,并通过与金相分析所确定的材料中各对应相含量一一进行对比 ,进而确定出裂纹穿过各组成相的优先程度 ,实现了该多元复合材料微观断裂机制的定量表征。研究结果证实 :Si C颗粒粒度对该材料的微观断裂机制有着至关重要的影响。室温及高温的力学性能测试结果表明 ,根据微观断裂机制优化出的 Si C颗粒粒度为 1 0 μm的 Al2 O3- Al基复合材料 ,其力学性能总体水平优于国外同类产品。

WT5BZ]The phases on fracture surface of SiC p/Al 2O 3 Al composites synthesized by oxidative infiltration of Al melt were analyzed quantitatively using X ray photoelectron spectrometer for the first time, and then the content of various phase at fracture surface were compared one by one with the content of corresponding phase in the composites determined by metallographic examination By the comparison, the preference for the crack penetrating various phases of the composites was identified,in turn micro fracture mechanisms of the composites were revealed quantitatively It is proved that SiC particle size has a critical influence on the micro fracture mechanisms of this kind of composites The tested results of mechanical properties at room and elevated temperature show that, the total level of mechanical properties of the Al 2O 3 Al matrix composites containing 10μm SiC particle which are optimized on basis of the above mentioned analysis of micro fracture mechanisms, is superior to abroad products of the same kind