Preparation and structures of plasma-sprayed γ- and α-Al2O3 coatings

G. N. Heintze, S. Uematsu

研究成果: Article査読

76 被引用数 (Scopus)

抄録

As-sprayed Al2O3 coatings containing more than 99.5% γ-Al2O3 were prepared by optimizing torch parameters. Lamellae were 1-4 μm thick with grains ranging from 0.1 to 1 μm in diameter. Using the same torch conditions, but slowly traversing the torch over the substrate, coatings containing α-Al2O3 were produced. Three types of microstructures were observed in each pass of the torch: type I, in the lower region, believed to have nucleated as γ-Al2O3 and transformed to α-Al2O3 from the heat of the torch and coating; type II, above type I, which nucleated as α-Al2O3 and had separate lamellae because solidification was completed before the next droplet arrived; type III, in the upper region, which nucleated as α-Al2O3 and contained grains over 200 μm in length because the previous droplet had not finished solidifying before the next droplet impacted. Thermal expansion and pore size distributions were measured, as also were temperatures within the coatings during their deposition.

本文言語English
ページ(範囲)213-222
ページ数10
ジャーナルSurface and Coatings Technology
50
3
DOI
出版ステータスPublished - 1992 2月 6
外部発表はい

ASJC Scopus subject areas

  • 化学 (全般)
  • 凝縮系物理学
  • 表面および界面
  • 表面、皮膜および薄膜
  • 材料化学

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