一维纳米自愈合网络基体结构构建、抗氧化机理及对Cf/SiC复合材料抗氧化性能的作用机制

项目名称： 一维纳米自愈合网络基体结构构建、抗氧化机理及对Cf/SiC复合材料抗氧化性能的作用机制

项目编号： No.51502323

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 一般工业技术

项目作者： 胡建宝

作者单位： 中国科学院上海硅酸盐研究所

项目金额： 21万元

中文摘要： 针对基于多层自愈合基体结构的Cf/B4C-SiC复合材料在高应力疲劳氧化条件下使用寿命降低的问题，构建一种新型的一维纳米自愈合网络基体结构。以BN纳米管（BNNT）作为一位纳米自愈合相，取代传统脆性的自愈合陶瓷基体组分(如B4C），起到共强化自愈合作用。通过调控BNNT/基体的界面结合，对基体进行强化或韧化，提高基体的裂纹开裂应力、抗疲劳性能，高比表面积的一维纳米自愈合相诱导裂纹在BNNT/基体界面处偏转，大裂纹枝化、微裂纹化，延长氧气扩散路径，提高裂纹愈合效率。研究一维纳米自愈合网络基体结构的抗氧化机制以及基于一维纳米自愈合网络基体结构的Cf/（BNNT+SiC）的抗氧化机理，为提高Cf/SiC复合材料在高应力疲劳氧化环境下的使用寿命奠定基础。

中文关键词： 界面特性；自愈合；力学性能；高温使用性能；抗氧化性

英文摘要： In order to solve the poor fatige service life of Cf/B4C-SiC with multi-layered self-healing matrix sturcture under high stress and oxidation atomsphere , a new oxidation resistant matrix structure -one dimentional nano-network of self-healing phase matrix structure is builted. BN nanotube (BNNT) is slected as the one dimentional nano self-healing phase to replace the conventional brittle matrix constituent with function of self-healing （such as B4C). The one dimentional nano-network of self-healing phase can not only seal the cracks, but aslo reinforce the matrix. The matrix can be strengthened or toughened by tailoring the interfacial bonding of BNNT/matrix. The matrix carcking stress and fatige resistance can aslo be improved. More cracks are deflected at BNNT/matrix interface, big cracks are refined. The length of the diffusion path of oxygen is increased and the sealing rate is improved because the narrowness of debonding zone. The oxidation resistance mechanism of the one dimentional nano-network of self-healing phase matrix structure and the Cf/(BNNT+SiC) composite with such self-healing matrix sturcture are studied. These solved new oxidation resistance mechanism can lay the foundation for the better servcie life of Cf/SiC composite under high stress fatige and oxidation atomsphere.

英文关键词： interface character;self-healing;mechanical property;performance in high temperature