CAJ | 학술논문

文章采用反应烧结工艺制备 Si/SiC 材料，然后通过真空扩散渗铝工艺制备了 Al-Si/SiC 复合材料。通过精确调控浸渗合金的铝浓度使制备的Al-Si/SiC复合材料具有可控的热膨胀系数，利用该工艺制备出热膨胀系数连续可调（4.6×10-6K-1~8.7×10-6K-1，0~40℃）的 Al-Si/SiC 复合材料，其力学性能优异，经检测密度为2.86g/cm3，弹性模量为236GPa，断裂韧性为6.1MPa·m1/2，可采用线切割、铣磨、钻孔、攻丝等手段加工，相比SiC陶瓷材料更易于高精度机械加工。扫描电子显微镜分析表明，制备的Al-Si/SiC复合材料均匀、致密，光学抛光后表面粗糙度均方根值达到1.017 nm。各项测试数据表明， Al-Si/SiC复合材料作为反射镜可以满足空间光学的应用。
문장채용반응소결공예제비 Si/SiC 재료，연후통과진공확산삼려공예제비료 Al-Si/SiC 복합재료。통과정학조공침삼합금적려농도사제비적Al-Si/SiC복합재료구유가공적열팽창계수，이용해공예제비출열팽창계수련속가조（4.6×10-6K-1~8.7×10-6K-1，0~40℃）적 Al-Si/SiC 복합재료，기역학성능우이，경검측밀도위2.86g/cm3，탄성모량위236GPa，단렬인성위6.1MPa·m1/2，가채용선절할、선마、찬공、공사등수단가공，상비SiC도자재료경역우고정도궤계가공。소묘전자현미경분석표명，제비적Al-Si/SiC복합재료균균、치밀，광학포광후표면조조도균방근치체도1.017 nm。각항측시수거표명， Al-Si/SiC복합재료작위반사경가이만족공간광학적응용。
Si/SiC composites are prepared by reaction sintering,and then Al-Si/SiC composite materials are produced with the pressureless infiltration fabrication technology using the Si/SiC composites. The Al-Si/SiC composites which have continuously adjustable coefficient of thermal expansion (CTE) (4.6×10-6K-1~8.7×10-6K-1, 0~40℃) are provided through precise control of Al volume fraction in the Al-Si alloy. Results show that Al-Si/SiC composites possess low density (2.86g/cm3), high elastic modulus (236GPa) and fracture toughness (6.1MPa·m1/2). Compared with SiC ceramics, the Al-Si/SiC composites are easier to wire cutting, milling, drilling and threading. Scanning electron microscopy observation displays that the composites are homogeneous and dense without porosity. Their surface roughness reach 1.017 nm (RMS). Results indicate that Al-Si/SiC composites as the mirror material can meet the space optics application.