CAJ | 학술논문

选用莫来石纤维为增强体,通过添加适量的烧结助剂,制备莫来石纤维增强氧化铝陶瓷基复合材料,探讨了不同烧结温度和不同纤维含量对复合材料性能的影响规律.结果表明:莫来石纤维增强氧化铝陶瓷基复合材料的相对密度、弯曲强度和断裂韧性随烧结温度和纤维含量的增加先增大后减小,当烧结温度为1450 ℃、纤维含量为15%时,复合材料的弯曲强度、断裂韧性最高,复合材料弯曲强度和断裂韧性分别达到502.36 MPa和3.48 MPa·m~(1/2),比基体材料分别提高63.8%和54.7%;相对密度达到98.41%.纤维的拔出和脱粘消耗了大量的能量,是莫来石纤维增强氧化铝陶瓷复合材料力学性能提高的主要原因.
선용막래석섬유위증강체,통과첨가괄량적소결조제,제비막래석섬유증강양화려도자기복합재료,탐토료불동소결온도화불동섬유함량대복합재료성능적영향규률.결과표명:막래석섬유증강양화려도자기복합재료적상대밀도、만곡강도화단렬인성수소결온도화섬유함량적증가선증대후감소,당소결온도위1450 ℃、섬유함량위15%시,복합재료적만곡강도、단렬인성최고,복합재료만곡강도화단렬인성분별체도502.36 MPa화3.48 MPa·m~(1/2),비기체재료분별제고63.8%화54.7%;상대밀도체도98.41%.섬유적발출화탈점소모료대량적능량,시막래석섬유증강양화려도자복합재료역학성능제고적주요원인.
Mullite fiber reinforced alumina ceramic matrix composites (MFACC) were prepared by adding sintering assistants. The influence regularities of the mullite fiber content and sintering temperature on properties of MFACC were studied. The results show that the relative density, flexural strength and fracture toughness of MFACC increase initially and then decrease with increasing sintering temperature and mullite fiber content. When the content of mullite fiber is 15% and the sintering temperature is 1450 ℃, the flexural strength and fracture toughness of the composite can reach 502.36 MPa and 3.48 MPa·m~(1/2), respectively, which have increased by 63.8% and 54.7% compared with the original matrix, and the relative density of the composites reaches 98.41%. Fiber pull-out and debonding consuming a lot of fracture energy are considered to be the main toughening mechanism, and thus the mechanical properties of MFACC are improved significantly.