Microstructural composite mullite derived from oxides via a high-energy ball milling process
Microstructural composite mullite derived from oxides via a high-energy ball milling process
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DOI：
10.1016/j.ceramint.2003.12.022
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发表时间：
2004
影响因子：
5.2
通讯作者：
L. Kong;Ting Zhang;Yu Chen;J. Ma;F. Boey;Haitao Huang
中科院分区：
文献类型：
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作者：
L. Kong;Ting Zhang;Yu Chen;J. Ma;F. Boey;Haitao Huang
高能球磨对氧化物前驱体合成莫来石的物相形成和形貌发展有很大影响。Al2O3和石英的混合氧化物在1300°C下不经高能球磨就形成莫来石相，直到1500°C莫来石化才完全。研磨5小时后，莫来石化温度降低约200°C。同时，得到了莫来石晶须。在此基础上，提出了以氧化物前驱体混合物为原料，经高能球磨和不经高能球磨制备显微结构复合莫来石陶瓷的方法。未研磨的前驱体烧结成等轴晶粒，而研磨的前驱体导致各向异性晶粒。等轴晶和各向异性晶粒的相对比例可以通过前驱体混合物容易地调节。此外，莫来石微晶来自于在低温下研磨的前驱体粉末作为种子，以促进莫来石相的形成的复合材料。认为用这种方法制备的莫来石晶须也可用作增强组分，设计其它材料的结构复合材料。
High-energy ball milling had a great influence on phase formation and morphology development of mullite derived from oxide precursors. Mullite phase was formed at 1300°C in an oxide mixture of Al2O3and quartz without high-energy ball milling and the mullitization was not complete up to 1500°C. After milling for 5h, the mullitization temperature was reduced by about 200°C. At the same time, mullite whiskers were obtained. Based on these results, microstructural composite mullite ceramics were proposed to be made from the mixtures of the oxide precursors with and without the high-energy ball milling. The unmilled precursor was sintered to equiaxed grains while the milled one resulted in anisotropic grains. The relative proportion of the equiaxed and anisotropic grains could be readily adjusted by the precursor mixtures. Moreover, the mullite crystallites coming from the milled precursor powder at low temperature acted as seeds to enhance the mullite phase formation of the composites. It is believed that the mullite whiskers produced in this way can also be used as reinforcing components to design structural composites of others materials.