Cu/Mo双涂层改性SiCf/Ti6Al4V复合材料的界面与性能

Interface and Properties of Cu/Mo Duplex-Coated SiC Fiber-Reinforced

摘要:

采用箔-纤维-箔 (FFF) 法分别制备无涂层、C涂层和Cu/Mo双涂层改性的SiCf/Ti6Al4V复合材料，对制备态复合材料的力学性能和界面微观组织进行对比分析，进一步研究不同真空热暴露处理对Cu/Mo双涂层改性复合材料的界面微区的影响规律。结果表明，制备态下Cu/Mo涂层比C涂层较好地改善了复合材料的界面组织和性能，且对基体和纤维中元素扩散均具有一定的阻挡作用；求得900 ℃下SiCf/Cu/Mo/Ti6Al4V界面反应的生长动力学公式为H=1.380t1/2+ 5.397

Abstract:

Foil-Fiber-Foil (FFF) method was used to prepare Ti6Al4V-matrix composites reinforced by SiC fibers without coating, with C coating and Cu/Mo duplex coatings, respectively. The mechanical properties as well as interfacial microstructure of the as-prepared composites were compared. Moreover, the interfacial reaction characteristics of the SiCf/Cu/Mo/Ti6Al4V composites were also investigated by different vacuum heat treatments. The results show that for as-prepared samples, Cu/Mo coating is better than C-coating to improve the interfacial microstructure and properties of titanium matrix composites; the growth kinetic expression of the SiCf/Cu/Mo/Ti6Al4V interfacial reaction at 900 ℃ is H=1.380t1/2+5.397