多孔Al_(2)O_(3f)/Al_(2)O_(3)复合材料研究进展

Research Progress on the Porous Al_(2)O_(3)f/Al_(2)O_(3) Composites

作为20世纪90年代兴起的一类连续陶瓷纤维增强陶瓷基复合材料,连续氧化铝纤维增韧氧化铝(Al_(2)O_(3f)/Al_(2)O_(3))复合材料已经发展为与C_(f)/SiC、SiC_(f)/SiC等非氧化物复合材料并列的陶瓷基复合材料。以多孔基体实现基体裂纹偏转成为Al_(2)O_(3f)/Al_(2)O_(3)复合材料主要的增韧设计方法,形成的多孔Al_(2)O_(3f)/Al_(2)O_(3)复合材料具有优异的抗氧化性能和高温力学性能,可在高温富氧、富含水汽的中等载荷工况中长时服役,是未来重要的热结构材料。经过近30年的发展,多孔Al_(2)O_(3f)/Al_(2)O_(3)复合材料已被应用于航空发动机、燃气轮机等热端部件。本文综述了多孔Al_(2)O_(3f)/Al_(2)O_(3)复合材料的增韧设计方法、制备方法、微观结构和力学性能等多个方面的研究进展,并提出了当下存在的问题以及后续发展方向。

As one kind of ceramic matrix composites which rose in the 1990s,continuous alumina fiber reinforced alumina matrix(Al_(2)O_(3)f/Al_(2)O_(3))composites have been developed into structural materials that are as important as those nonoxide/nonoxide ceramic matrix composites like Cf/SiC and SiCf/SiC composites.The main approach to achieve damage tolerance for the Al_(2)O_(3)f/Al_(2)O_(3) composites is the porous matrix rather than fiber coating.Due to their excellent oxidation resistance and hightemperature mechanical properties,the porous Al_(2)O_(3)f/Al_(2)O_(3) composites can be used for a long time under varying environmental factors,such as high temperature,modest loads and moisture,and have already been developed as prime candidate materials for thermal structural materials.After about 30 years of development,the porous Al_(2)O_(3)f/Al_(2)O_(3) composites have already been applied in hot sections such as aeroengine and gas turbine.This paper summarizes the research progress in design for tough behavior,preparation,microstructure and mechanical properties of the porous Al_(2)O_(3)f/Al_(2)O_(3) composites.Finally,the key problems and future development tendency of the porous Al_(2)O_(3)f/Al_(2)O_(3) composites are proposed.