Al_(2)O_(3)/Al_(2)O_(3)陶瓷基复合材料的蠕变性能及损伤机理  

Creep Performance and Damage Mechanism of Al_(2)O_(3)/Al_(2)O_(3)Ceramic Matrix Composites

作　　者：王亮 聂飞晴 肖鹏 曲士昱 何玉怀 许巍 WANG Liang;NIE Feiqing;XIAO Peng;QU Shiyu;HE Yuhuai;XU Wei(Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation,Key Laboratory of Aeronautical Materials Testing and Evaluation,Aero Engine Corporation of China,Science and Technology on Advanced High Temperature Structural Materials Laboratory,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China)

机构地区：[1]中国航发北京航空材料研究院,航空材料检测与评价北京市重点实验室,中国航空发动机集团材料检测与评价重点实验室,先进高温结构材料重点实验室,北京100095

出　　处：《陶瓷学报》2025年第1期129-138,共10页Journal of Ceramics

基　　金：中国航发北京航空材料研究院创新基金。

摘　　要：Al_(2)O_(3)/Al_(2)O_(3)陶瓷基复合材料因其出色的耐高温、抗氧化等特性在航空发动机领域得到了广泛应用。这种材料能够在极端高温环境中保持稳定的性能,对于确保发动机的安全和可靠性至关重要。本文对Al_(2)O_(3)/Al_(2)O_(3)复合材料在1000℃~1200℃下的拉伸蠕变性能,并通过扫描电子显微镜、高分辨率透射电子显微镜以及纳米压痕等实验方法对试样在不同温度、应力下的断口形貌进行表征。结果表明,随着温度的升高,Al_(2)O_(3)纤维晶粒逐渐长大,强度明显下降,从而导致了复合材料的蠕变抗力显著下降。当蠕变温度为1200℃时,复合材料的蠕变速率较1100℃高了两个数量级,断裂时间大幅缩短,观察试样断口发现,在1100℃的蠕变实验中,纤维拔出长度较长,并未出现明显的基体裂纹。这表明基体与纤维界面结合较好,基体开裂受到抑制,基体和纤维共同分担载荷;而在1200℃,纤维拔出长度较短,强度下降速度更快,蠕变寿命缩短。[Background and purpose]With the rapid development of aero-engine and aerospace technology,there is increasing demand for heat resistance materials.At present,defense and civil aircrafts are flying at supersonic speed,while the service temperature of the hot-end components even reaches 1600℃.Therefore,higher temperature resistance requirements are proposed for aviation engines and their surrounding materials.Currently,most of the engines are nickel-based high-temperature alloys with high temperature resistance,light weight and anti-deformation capability.Because the working temperature of the alloy materials is already close to their temperature limit,it is impossible to further increase the operating temperature.Comparatively,ceramic matrix composites have various advantages,such as high bearing capacity,high erosion resistance,low density and high reliability,which are ideal alternative materials for high temperature hot end components.In this study,higher oxidation resistance and lower cost oxide fiber oxide composites were studied[Methods]A high-temperature creep machine was used to test creep performance of the composite materials made of Al_(2)O_(3)/Al_(2)O_(3)ceramic matrix containing Nextel 720 fibers.The test was conducted at three temperatures,i.e.,1000℃,1100℃,and 1200℃.After the temperature was stabilized,a constant mechanical load was applied at 100 MPa and 120 MPa.After the creep test,the fractured morphology of the creep samples was observed using a scanning electron microscope(SEM),to identify the creep damage mechanism of the Al_(2)O_(3)/Al_(2)O_(3)ceramic matrix composite materials.Modulus and hardness of the fibers were measured by using nano-indentation,while the microstructure was observed by using transmission electron microscope(TEM).[Results]The creep rate at 1200℃/120 MPa is much greater than that at 1000℃/100 MPa.The creep activation energies for the Al_(2)O_(3)/Al_(2)O_(3)composite at 120 MPa and 100 MPa are 798.9 kJ·mol^(−1) and 766.0 kJ·mol^(−1) respectively.A large n

关 键 词：Al_(2)O_(3)/Al_(2)O_(3)陶瓷基复合材料 蠕变性能 蠕变损伤 

分 类 号：TQ174.75[化学工程—陶瓷工业]