Cf表面修饰强韧化AB3型IMC/Al2O3复合材料的强度稳定性及高温氧化行为

项目名称： Cf表面修饰强韧化AB3型IMC/Al2O3复合材料的强度稳定性及高温氧化行为

项目编号： No.51461029

项目类型： 地区科学基金项目

立项/批准年度： 2015

项目学科： 一般工业技术

项目作者： 贾建刚

作者单位： 兰州理工大学

项目金额： 48万元

中文摘要： 室温脆性大和高温强度低一直是金属间化合物高温结构材料实用化的关键障碍，室温韧化往往无法兼顾甚至降低其高温性能；高温增强又会损失韧性和引起脆化。本研究以Fe3Si、Ni3Si、Fe3Al、Ni3Al为研究对象，在制备Fe3Si/α-Al2O3等复合粉体基础上，利用热压烧结引入短Cf以及表面包覆Cu或Al2O3的短Cf，通过Cf与基体的弥散复合提高Fe3Si/α-Al2O3 等复合体系微观组织的整体均匀性，以提高其室温强度稳定性和可靠性，同时提高其高温强度。通过研究复合体系中界面结构、微区性能、界面相及氧化失效行为等科学问题，明确碳纤维含量与复合材料强度稳定性关联规律、强韧化机理及氧化失效机制，使碳纤维含量在复合材料强韧化和高温氧化失效之间取得平衡，最终得到室温强度稳定、高温补强且抗氧化性能良好的金属间化合物基高温结构材料，为开发用于1000℃以上的新型金属基复合材料提供技术储备或打下基础。

中文关键词： 金属间化合物；强韧化；强度稳定性；高温氧化；M(=Fe；Ni)3A(=Si；Al)

英文摘要： High brittlement (low reliability) at room-temperature and low strength at high-temperature are key obstacles for the practical application of the structural intermetalic materials at elevated temperature. Room-temperature toughening cannot improve, sometimes degrade, the high-temperature properties of the materials. On the other hand, high-temperature strengthening will cause extra embrittlement and toughness losing. In order to increase the room-temperature toughness and the high-temperature strength of Fe3Si, Ni3Si, Fe3Al and Ni3Al, Carbon fiber and/or carbon fiber coated with Cu or Al2O3 was introduced into the Fe3Si/α-Al2O3, Ni3Si/α-Al2O3 ,Fe3Al/α-Al2O3 and Ni3Al/α-Al2O3 matrax by hot pressing to improve the microstructure integrity and homogeneity and to improve the strength stablity and reliability, as well as the high temperature strength. Some scientific problems such as the interface structure, the micro-zone properties, the interface phases and the high-temperature behavior of the composites will be studied to understand the relationship between the volum percentage of carbon fiber and the strength stability of the composites, and to understand the toughening mechanism and high-temperature oxidation mechanism. This study also aims at balancing the room-temperature toughening and high-temperature failure with proper carbon fiber content, acquiring high-temperature structural intermetallic matrix composites with excelent room-temperature toughness, high-temperature strength and oxidation resistance and laying the foundation or offering the technical reserve for the develement of new metal matrix composits used at over 1000℃.

英文关键词： Intermetallic;Toughening;Strength stability;High temperature oxidation;M(=Fe;Ni)3A(=Si;Al)