摘要
采用溶胶-凝胶法制备了针刺碳纤维增强莫来石基复合材料。借助于TG-DTA和XRD对合成凝胶的莫来石化过程进行研究,结果表明,在热处理过程中,凝胶在920°C左右形成铝硅尖晶石,1198°C左右形成莫来石。研究了烧结温度对复合材料性能的影响,结果表明,烧结温度为1500°C制备的复合材料弯曲强度最高,达到142.2 MPa,断裂韧性为8.77 MPa·m^(1/2)。借助于对复合材料微观结构的观察对复合材料力学性能的变化进行了解释。
The needled carbon fiber reinforced mullite matrix composites were fabricated via sol-gel route. The phase transformation of mullite xerogels during the thermal process were investigated by TG-DTA and XRD. The results indicated that the Al,Si-spinel is formed at 920℃ and mullite is formed at 1198℃. The effect of heat treatment temperature on the properties of the composites was also studied. The flexural strength and fracture toughness of the needled carbon fiber reinforced mullite matrix composites are measured to be 142.2 MPa and 8.77 MPa·m1/2, respectively. The strength improvement was interpreted with the microstructural analysis of the composites prepared at different temperatures. The needled carbon fiber reinforced mullite matrix composites exhibited a significant tough fracture behavior.
出处
《现代技术陶瓷》
CAS
2017年第3期189-196,共8页
Advanced Ceramics
基金
山东省自然科学基金(ZR2015EL005)
