【摘要】 采用干法成型、常压烧结工艺制得致密的ＺＴＭ／Ａｌ２Ｏ３复合陶瓷材料。通过引入大颗粒的氧化铝，使ＺＴＭ陶瓷（氧化锆增韧莫来石陶瓷）的力学性能有明显提高。组成２０Ｖｏｌ％Ａｌ２Ｏ３－２０Ｖｏｌ．％ＺｒＯ２－ｍｕｌｉｔｅ陶瓷材料，其断裂韧性为６．０６ＭＰａ．ｍ１／２，抗弯强度为４０３ＭＰａ。实验结果表明：Ａｌ２Ｏ３的弥散强化和ＺｒＯ２的相变增韧及微裂纹增韧是ＺＴＭ／Ａｌ２Ｏ３陶瓷的主要增韧机理。更多还原

【Abstract】 Densed ZTM/Al 2O 3 ceramic composites were prepared by dry shaping and pressurelless sintering. With the addition of Al 2O 3 particles, the mechanical properties of ZTM ceramics (ZrO 2-toughened mullite ceramics) are significantly improved. The flexural strength and fracture toughness of the mullite based composites containing 20Vol.%Al 2O 3 and 20Vol.%ZrO 2 are as fellows:б bb =403MPa, K 1c =6.06MPa.m 1/2 . The main reinforcing mechanisms for ZTM/Al 2O 3 composites were effects of dispersion-strengthening of Al 2O 3 particles, transformation and microcrack toughenign of ZrO 2.更多还原