论文部分内容阅读
采用气压浸渗法制备高体积分数的SiC/Al复合材料,测试了其SiC预制型经过1200℃高温氧化4 h得到的该复合材料的抗弯强度,最高可达422 MPa,分析了界面产物以及结合状况;同时,对复合材料进行T2态和T6态热处理,T2态处理后,该复合材料抗弯强度降低,T6态处理后,其抗弯强度最高可达462 MPa,约提高9%。采用激光拉曼光谱分析了两种不同热处理后的力学性能变化的原因,T2态处理消除了复合材料的内应力,而T6态复合材料中仍然存在内应力;对比分析了两种不同热处理下的断口形貌,进行了该复合材料不同强度的评析。
The SiC / Al composites with high volume fraction were prepared by pressure impregnation method. The flexural strength of SiC composites prepared by oxidation of SiC preforms at 1200 ℃ for 4 h were tested. The flexural strength of the composites was up to 422 MPa. The interface products and At the same time, the composites were heat-treated in T2 and T6 states. After T2 treatment, the bending strength of the composites decreased. After T6 treatment, the bending strength of the composites reached 462 MPa, about 9% higher. Laser Raman spectroscopy was used to analyze the reason of the change of mechanical properties after two different heat treatments. The T2 state treatment eliminated the internal stress of the composites, while the internal stress still existed in the T6 state composites. Fracture morphology, the strength of the composite materials were evaluated.