纳米YSZ热喷涂粉末的制备及其性能

Preparation and Properties of Nano-YSZ Thermal Spraying Powders

基于纳米涂层的优异性能,研究了纳米YSZ热喷涂粉末的制备工艺。喷雾干燥造粒后,分别用霍尔漏斗法和电子扫描显微镜对团聚体粉末的流动性、松装密度及微观形貌进行了测试与分析。研究发现,固含量越高,粉末的流动性及松装密度性能越好,但过高的固含量反而会影响造粒效果;在固含量一定的情况下,黏结剂含量适中的浆料造粒后团聚体粉末的流动性更好。为了得到性能更好的团聚体粉末,合理的后续处理方法是在电流300A,电压40V条件下进行等离子致密化。

The preparation process of nano-YSZ thermal spraying powders was investigated on the excellent performance of nano coating.The agglomerated powders were prepared by spray-drying.The flow ability,free holding density and microstructure of agglomerated powders were tested and analyzed by Hall funnel method and scanning electron microscopic respectively.The result shows that the higher solid content is,the better flow ability and free holding density of powders they will be.However,an overhigh solid content will affect the granulation results.Maintaining a solid content,flow ability of powders is better with moderate binder content.To gain the agglomerated powders of better properties,the optimum follow-up process is the plasma densification process with current 300A and voltage 40V.