以自蔓延高温合成SiC颗粒为增强体的光学/仪表级铝基复合材料

尝试采用自蔓延高温合成（SHS）、具有近球特征且表面粗糙的新型SiC颗粒，以替代传统的角状磨料级SiC颗粒，作为光学/仪表级的高体分SiCp/Al复合材料的增强体。研究结果表明：与传统角状SiC颗粒相比，SHS-SiC颗粒的无棱角，近球形几何特征，使其附近铝基体中的应力集中程度显著降低，进而使材料的强度包括表征尺寸稳定性的微屈服强度明显提高：SHS-SiC颗粒所特有的粗糙表面形貌，使SiC-Al之间的界面结合通过机械镶嵌机制得到了进一步的增强，跨越界面的载荷传递效率进一步提高，并表现为复合材料的弹性模量有所提高。

Optical and Instrument Grade Aluminum Matrix Composites Reinforced with Self-Propagating High-Temperature Synthesized SiC Particle

The reinforcing effects as the reinforcement of high volume fraction optical and instrument SiC p/Al composites were systemically compared, between the novel near spherical SHS SiC particle with rough surface topography and the common abrasive grade SiC particle with angular shape and relatively smooth surface The results show that the SHS SiC particle is more effective than the abrasive grade SiC particle for strengthening of the aluminium matrix composites, as a result of the local stress concentration extent of Al matrix in the vicinity of the near spherical geometry particulate is much slighter than that in the vicinity of the pointed end of the common abrasive grade SiC particle , which will decrease the probability of crack initiation in matrix, in turn improve the strength (including micro yield strength characterizing the dimension stability of materials) More effective mechanical keying arising from rough topography on the surface of SHS SiC , leads to stronger interface bonding and contributes to higher load transferring efficiency and elastic modulus of composite