稀土氧化物对钛酸铝陶瓷显微结构和力学性能的影响

研究了添加稀土氧化物Y2O3和Y2O3+Nd2O3对钛酸铝陶瓷的烧结温度、力学性能和显微结构的影响.结果表明,添加1%的稀土氧化物可以降低钛酸铝陶瓷的烧结温度,改善其显微结构,提高其力学性能,尤其是添加1%的复合稀土氧化物(Y2O3+Nd2O3)后,钛酸铝陶瓷的抗折强度和断裂韧性是未添加的试样的1.96倍和1.82倍.其性能提高的主要原因是由于稀土元素的细晶强化、净化界面、固溶强化、自增韧补强等作用.

Effect of rare earth oxides on microstructure and mechanical properties of aluminum titanate ceramics

Effects of Y2O3 and the mixture of Y2O3 and Nd2O3 on sintering temperature,microstructure and mechanical properties of aluminum titanate ceramics were studied. The experimental results show that the sintering temperature can be reduced, and the microstructure and mechanical properties can be improved by adding 1 % rare earth oxides in aluminum titanate ceramics. The bending strength and fracture toughness of the composites adding 1% mixture of Y2O3 and Nd2O3 are 1.96and 1.82 times respectively of that without adding rare earth oxides. The reason is that the rare earth oxides added in aluminum titanate ceramics can contribute to the strengthening by the refinement of grain size, purification of grain boundary,solid solution strengthening and in-situ strengthening and toughening.