为获得莫来石热喷涂粉末,采用天然红柱石粉末作为原料,在1480℃保温4 h完成一次莫来石化后,加入适量Al2O3再次在1480℃保温4 h进行二次莫来石化反应,利用喷雾干燥工艺制备莫来石粉末,分析了红柱石粉末和莫来石化粉末的成分及相组成,测试了粉末粒度分布,表征了粉末的形貌.结果表明：天然矿物红柱石粉末一次莫来石化后,粉末主要由莫来石和质量分数约20%的SiO2组成;经过二次莫来石化反应后,粉末成分为莫来石和微量的Al2O3;二次莫来石化的粉末经喷雾干燥、热处理后,粉末的流动性和松装密度得以改善;热处理后粉末粒度呈典型的正态分布,且粒径尺寸适合大气等离子喷涂.
To obtain mullite thermal spray powders,natural andalusite powders were annealed at 1480℃in air for 4 h to promote their mullitization,then,after adding an appropriate amount Al 2 O3 powders,the secondary mullitization was carried out.The mullitized powders were prepared by spray-dried process.The component and phase structure of the powders before and after mullitzation were analyzed,the size distribution of the powders was tested,and the morphology of spray-dried powders was investigated.The results showed that the primary mullitized andalusite powders contained mullite and about 20wt%SiO2.After the secondary mullitization,the powders were constituted of mullite and a limited amount of Al 2 O3.The fluidity and apparent density of spray-dried powders were improved by heat-treatment,and its typical size distribution was suitable for air plasma spray.
参考文献
| [1] | F. Cipri;C. Bartuli;T. Valente;F. Casadei .Electromagnetic and Mechanical Properties of Silica-Aluminosilicates Plasma Sprayed Composite Coatings[J].Journal of Thermal Spray Technology,2007(5/6):831-838. |
| [2] | 侯平均,黄国鹏,王汉功,汪刘应.微弧等离子喷涂制备莫来石/金属复合热障涂层[J].焊接学报,2009(05):85-88,92. |
| [3] | 李柳生,平增福.红柱石的莫来石化[J].硅酸盐通报,2006(01):34-36. |
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