为了提高Al2O3-MgO-ZrO2层状复合陶瓷烧嘴材料的强度、韧性和热震性能,制备了SiC/SiO2-Al2 O3-MgO-ZrO2新型陶瓷材料.结果表明,SiC/SiO2复合纳米粉体的添加大大增加了材料的体积密度,增强了材料的抗弯强度和断裂韧性.特别是经1850℃焙烧的样品,当SiC/SiO2复合纳米粉体的含量为7％(质量分数)时,试样的抗弯强度和断裂韧性分别提高了23.1％和25.5％,在热震温差超过1000℃的恶劣条件下,其残余抗弯强度保持率仍高达69％.SEM观察表明,单纯的Al2O3-MgO-ZrO2材料的断面有游离的柱状颗粒存在,而添加SiC/SiO2的样品,不同氧化物和非氧化物颗粒紧密结合,形成光滑圆润的波浪状结构,这一显微结构对提高材料的力学性能有重要作用.
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