SiC_(f)/TC17复合材料制备方法对界面反应层 生长动力学的影响  

Investigation on the influence of SiC_(f)/TC17 composites preparation method on growth kinetics of interfacial reactive layer

作　　者：王敏涓 李虎 李四清 王宝 黄旭 黄浩 WANG Minjuan;LI Hu;LI Siqing;WANG Bao;HUANG Xu;HUANG Hao(AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Key Laboratory of Advanced Titanium Alloys,Aero Engine Corporation of China,Beijing 100095,China)

机构地区：[1]中国航发北京航空材料研究院,北京100095 [2]中国航空发动机集团先进钛合金重点实验室,北京100095

出　　处：《航空材料学报》2023年第4期68-75,共8页Journal of Aeronautical Materials

摘　　要：连续SiC纤维增强钛基复合材料(SiC_(f)/Ti复合材料)具有良好的比强度和综合力学性能,是新一代装备研制备受关注的轻质高温结构材料。SiC_(f)/Ti复合材料可采用箔压法(FFF)和基体涂层法(MCF)进行制备,为对比两种工艺方法对其界面反应生长的影响,采用FFF和MCF分别制备SiCf/TC17复合材料。对两种工艺制备的SiC_(f)/TC17复合材料在高温下(800~900℃)进行热暴露处理,通过扫描电镜对其微观结构及界面反应层厚度进行分析,获得界面反应层在高温下的生长速率,并进一步获得不同制备工艺状态下材料的界面反应动力学参数。结果表明:相同温度下MCF法制备的SiC_(f)/TC17复合材料界面反应速率大于FFF法制备的复合材料,前者的反应速率因子k0为4.942×10^(−3) m/s^(1/2),反应激活能Q为276.3 kJ/mol,后者的界面反应速率因子k0为8.149×10^(−3) m/s^(1/2),反应激活能Q为291.7 kJ/mol。这是由于MCF法制备的钛合金基体具有更微小的相组织,具有较小的反应激活能,在高温下具有更高的元素扩散速率。Continuous SiC fiber reinforced titanium matrix composite(SiC_(f)/Ti composite)has good specific strength and comprehensive mechanical properties,it is a lightweight high temperature structural material that attracts much attention in the new generation of equipment development.SiC_(f)/Ti composites can be prepared by the methods of foil fiber foil(FFF)and matrix coating fiber(MCF).In order to compare the effects of the two methods on the growth of interfacial reaction,SiC_(f)/TC17 composites were prepared by FFF and MCF respectively.By study the interfacial reaction layer thickness of composites prepared by the two processes after thermal exposure at the temperature from 800℃ to 900℃,the microstructure and the thickness of interfacial layer were analyzed by scanning electron microscope,further the interfacial reaction rate at high temperature was obtained,and the interfacial reaction kinetic parameters of different materials were attained.The results showed that the interfacial reaction rate of SiCf/TC17 composite prepared by MCF method was higher than that of the composites prepared by FFF method at the same temperature.The interfacial reaction rate factor k0 is 4.942×10−3 m/s1/2 and 8.149×10^(−3) m/s1/2 for the composites prepared by MCF and FFF method,respectively.Additionally,the reaction activation energy Q is 276.3 kJ/mol and 291.7 kJ/mol for those,respectively.This is because the titanium alloy matrix prepared by MCF method has smaller phase structure and higher element diffusion rate at high temperature.Therefore,the composite prepared by MCF has lower reaction activation energy at high temperature.

关 键 词：SiCf/Ti复合材料 箔压法 基体涂层法 反应动力学 

分 类 号：TB333[一般工业技术—材料科学与工程]