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机械法制备超细氧化铝粉体及其在ZTA陶瓷上的应用

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Abstract:

采用机械研磨不同时间制备不同粒级的氧化铝(Al2O3)超细粉体,将该超细粉体应用于制备氧化铝-氧化锆(Al2O3-ZrO2,ZTA)复相陶瓷,研究了该超细粉体对ZTA复相陶瓷性能的影响。用氮气吸附法测量Al2O3粉体的比表面积,用X射线透射沉降粒度仪、电超声粒度仪测定Al2O3粉体的粒径。研磨实验结果表明微米级氧化铝原料经研磨可得到亚微米和纳米粒级产品,其中纳米Al2O3粉体平均粒径为70nm,比表面积大于115m2/g;X射线衍射表明Al2O3晶形未发生变化,随着研磨时间的增加,Al2O3结晶度会降低、各晶面受到不同程度的破坏、晶相仍然是α相。将研磨制备的Al2O3超细粉体与15%(质量分数)的ZrO2复合并在不同温度下烧结ZTA陶瓷。经测试,ZTA在1550℃烧结后,其体积密度最高可达到99%以上,抗弯强度最高可达到720MPa,断裂韧性最高可达到6.86MPa·m1/2,其机械性能优于用化学法制备的氧化铝超细粉体与15%(质量分数)的ZrO2复合的ZTA陶瓷。

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