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Effects of critical plasma spray parameter and spray distance on wear resistance of Al2O3-8 wt.%TiO2 coatings plasma-sprayed with nanopowders

Title
Effects of critical plasma spray parameter and spray distance on wear resistance of Al2O3-8 wt.%TiO2 coatings plasma-sprayed with nanopowders
Authors
Song, EPAhn, JLee, SKim, NJ
POSTECH Authors
Lee, SKim, NJ
Date Issued
Apr-2008
Publisher
ELSEVIER SCIENCE SA
Abstract
Effects of plasma spraying conditions on wear resistance of nanostructured Al2O3-8 wt.%TiO2 coatings plasma-sprayed with nanopowders were investigated in this study. Five kinds of nanostructured coatings were plasma-sprayed on a low-carbon steel substrate by varying critical plasma spray parameter (CPSP) and spray distance. The coatings consisted of fully melted region of gamma-Al2O3 and partially melted region, and the fraction of the partially melted regions and pores decreased with increasing CPSP or decreasing spray distance. The hardness and wear test results revealed that the hardness of the coatings increased with increasing CPSP or decreasing spray distance, and that the hardness increase generally led to the increase in wear resistance, although the hardness and wear resistance were not correlated in the coating fabricated with the low CPSP. The main wear mechanism was a delamination one in the coatings, but an abrasive wear mode also appeared in the coating fabricated with the low CPSP. According to these wear mechanisms, the improvement of wear resistance in the coating fabricated with the low CPSP could be explained because the improved resistance to fracture due to the presence of partially melted regions might compensate a deleterious effect of the hardness decrease. (c) 2008 Elsevier B.V. All rights reserved.
Keywords
plasma spray coating; Al2O3-TiO2 nanopowder; CPSP; spray distance; wear resistance; NANOCRYSTALLINE POWDERS; MICROSTRUCTURE; ALUMINA; SURFACE; COMPOSITES; BEHAVIOR; ALLOY; STEEL
URI
http://oasis.postech.ac.kr/handle/2014.oak/29394
DOI
10.1016/J.SURFCOAT.2
ISSN
0257-8972
Article Type
Article
Citation
SURFACE & COATINGS TECHNOLOGY, vol. 202, no. 15, page. 3625 - 3632, 2008-04
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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