Structural considerations in plasma spraying of the alumina-zirconia composite

SURFACE & COATINGS TECHNOLOGY

卷:205

Article

Tarasi, F.¹  Medraj, M.¹  Dolatabadi, A.¹  Oberste-Berghaus, J.²  Moreau, C.² 

[1] Concordia Univ, Dept Mech Engn, Montreal, PQ H3G 1M8, Canada

[2] Natl Res Council Canada, IMI, Boucherville, PQ J4B 6Y4, Canada

关键词: Atmospheric plasma spray;    Amorphous phase;    Ceramic nano-composite;    Supersaturated solid solutions;    Melting and mixing;   

DOI  :  10.1016/j.surfcoat.2011.06.016

来源: Elsevier

【 摘 要 】

The focus of this study is the amorphous and crystalline phase formation in air plasma sprayed alumina-yttria stabilized zirconia coatings. In this multi-component system at compositions close to its eutectic, amorphous structures can arise by virtue of the high cooling rates of melted particles. Two avenues for amorphous phase formation have been identified: in-flight and upon-impact mixing. While the crystalline structure is largely retained by unmelted or partly melted feed particles embedded in the coating, it can also be created in the solidification process. The formation of a supersaturated crystalline phase is proposed. It was found that the formation of the crystalline phases with supersaturated composition in alumina-YSZ composite is possible, in spite of the high cooling rates during spray process. (C) 2011 Elsevier B.V. All rights reserved.

【 授权许可】

Free