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针对连续Si C纤维增强钛基复合材料界面反应速率、反应产物进行了研究。采用基体-纤维涂覆法和热等静压工艺,制备了连续W芯Si C纤维增强TC17复合材料。对复合材料进行不同温度、不同时间热暴露,通过SEM、TEM、EDS,表征分析了界面反应层厚度、界面处化学成分及界面反应产物类型。结果表明:C涂层能有效保护Si C纤维;界面反应层处的主要元素为Ti和C;制备状态试样的界面反应产物为Ti C1-x,靠近C涂层的Ti C1-x晶粒较细小,靠近基体Ti C1-x晶粒较粗大;高温热暴露使界面反应加剧,反应层厚度增加,反应层的生长符合抛物线规律,反应的动力学参数为频率因子k0=1.33×10-3m·s-1/2,反应激活能Q=243.22 k J·mol-1。
The interfacial reaction rate and reaction products of continuous Si C fiber reinforced titanium matrix composites were studied. A continuous W core Si C fiber reinforced TC17 composite was prepared by matrix-fiber coating and hot isostatic pressing. The composite materials were exposed to different temperatures and different times. The thickness of the interface reaction layer, the chemical composition at the interface and the type of the interface reaction products were analyzed by SEM, TEM and EDS. The results show that: C coating can effectively protect Si C fiber; the main elements of the interface reaction layer are Ti and C; the interfacial reaction product of the preparation state sample is Ti C1-x; and the Ti C1-x crystal near the C coating The finer TiCl-x grains near the matrix were coarser. The high temperature heat exposure aggravated the interfacial reaction and the thickness of the reaction layer increased. The kinetic parameters of the reaction layer were k0 = 1.33 × 10-3m · S-1/2, the reaction activation energy Q = 243.22 kJ · mol-1.