【摘要】 采用无压浸渗新工艺制备高碳化硅颗粒体份(55%～57%)的多功能铝基复合材料。X 射线检查和显微观察显示,所制备的复合材料致密、均匀。研究表明,SiC/Al 复合材料具有低的密度(2.94 g/cm3),高的杨氏模量(220 GPa),低的热膨胀系数(8×10–6 K–1)和非常高的热导率(235 W/mK)还使之具有卓越的热控功能,此外该材料还有着独特的防共振的能力。通过采用及开发一系列新工艺,可实现 SiC/Al 复合材料的高度近净形制备。目前已成功地制造了多种规格和类型的空间光机结构及机载光电平台用 SiC/Al 复合材料精密零部件,有几种典型产品还获得了实际应用。更多还原

【Abstract】 Multi-functional Al-matrix composites with high volume fraction (55%-57%) of SiC particles are produced with the new pres-sureless infiltration fabrication technology.X-ray detection and microscopic observation display the composites which are macroscopi-cally homogeneous without porosity.The investigation further reveals that the SiC/Al composites possess low density (2.94 g/cm3),high elastic modulus (220 GPa),prominent thermal management function as a result of low coefficient of thermal expansion (8×10–6 K–1) and high thermal conductivity (235 W/(m·K)) as well as unique preventability of resonance vibration.By adopting a series of developed techniques,the multi-functional SiC/Al composites have managed to be made into near-net-shape parts.Many kinds of precision com-ponents of space-based optomechanical structures and airborne optoelectronic platform have been turned out.Of them,several typical products are being under test in practices.更多还原