项目名称: 复合阻挡涂层对SiC/Ti基复合材料界面反应的调控研究
项目编号: No.51201138
项目类型: 青年科学基金项目
立项/批准年度: 2013
项目学科: 金属材料学科
项目作者: 李磊
作者单位: 西北有色金属研究院
项目金额: 25万元
中文摘要: 界面反应一直是制约钛基复合材料性能的主要因素之一,有效调控界面反应,形成最佳界面结构,是制备高性能钛基复合材料的关键。在纤维表面沉积阻挡涂层能够有效缓解界面反应,是调控界面反应的有力手段。研究表明,复合阻挡涂层具有优异的调控能力,特别是C/惰性涂层组合的复合阻挡涂层系统,受到了人们广泛关注。但是,目前对复合阻挡涂层界面反应的研究主要集中在长时间热处理后界面的变化,对于界面反应初期阻挡涂层在界面反应中的调控机制还有待深入探讨。本项目在理论分析C/惰性涂层/Ti系统的界面反应不同阶段主要扩散机制的基础上,设计了综合考虑惰性涂层晶体结构、晶格取向、厚度和基体类型等各因素的实验方案,研究界面反应的微观机理,揭示扩散行为在界面反应各阶段的作用,系统研究复合阻挡涂层对界面反应的调控机制,建立复合阻挡涂层的扩散模型,为高性能钛基复合材料的界面优化设计奠定理论基础。
中文关键词: 纤维增强钛基复合材料;阻挡涂层;界面反应;扩散;惰性涂层
英文摘要: Interface reaction is always one of the important factors that limits the performance of titanium matrix composites. Controlling of the interface reaction and optimizing the interface structure are the key points to produce high-performance titanium matrix composites. The barrier coating of SiC fiber for titanium matrix composites can slow down the interface reaction, and is an effective way to control the interface reaction. Researches reveal that complex barrier coatings show excellent ability in controlling the interface reaction, especially the coating system that consisting of an inert coating and a carbon coating which could combine the advantages of both types of the coatings. But now, the researches on the interface reaction for complex barrier coatings mainly focus on the variation of interface after long-time heat treatment, and the mechanism of the interface reaction at the initial stage need to be deeply understood. Based on the analysis of diffusion mechanism of different stages of interface reaction, we design experiments which take thickness, crystal structure, crystallographic orientation of the inert layer and types of matrix alloy into account. This program will disscuss the relationship between diffusion behaviors and interface reactions at different stages, and reveal the course of interface
英文关键词: fiber-reinforced titanium matrix composites; barrier coatings;interface reaction ;diffusion;inert coating