以微米 SiC颗粒和工业氧化铝为原料,采用机械混合法制备 Al2O3/SiC复合粉末.将复合粉末煅烧、成型,在 1 600℃, 2h烧结可制备出 Al2O3/SiC纳米复合陶瓷.通过 XRD、 DSC-TG、 SEM和 TEM等分析了煅烧和烧结过程中相组成的变化,烧成收缩和微观结构,结果表明:在氧化铝基体中添加 8%(质量分数)平均粒径为 5μ m的 SiC粒子,复合粉末经 700℃煅烧后再成型,试样于 1 600℃烧结,其相对体积质量可达 93.8%. SiC粒子主要被包裹在 Al2O3晶内形成"晶内型"纳米复合陶瓷.在烧结过程中由 SiC氧化形成的 SiO2包裹层与基质氧化铝反应形成的无定形莫来石前躯体可大大促进烧结; SiC埋料氧化形成的外壳可有效阻止烧结体内 SiC的进一步氧化.
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