Fabrication and Properties of Plasma-Sprayed Al^sub 2^O3/ZrO2 Composite Coatings

Al^sub 2^O3 /xZrO2 (where x = 0, 3, 13, and 20 wt.%) composite coatings were deposited onto mild steel substrates by atmospheric plasma spraying of mixed α-Al^sub 2^O3 and nano-sized monoclinic-ZrO2 powders. Microstructural investigation showed that the coatings comprised well-separated Al^sub 2^O3...

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Bibliographic Details
Published in:Journal of thermal spray technology 2011-12, Vol.20 (6), p.1259
Main Authors: Dejang, N, Limpichaipanit, A, Watcharapasorn, A, Wirojanupatump, S, Niranatlumpong, P, Jiansirisomboon, S
Format: Article
Language:English
Subjects:
Coatings
Fabrication
Online Access:Get full text
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Summary:Al^sub 2^O3 /xZrO2 (where x = 0, 3, 13, and 20 wt.%) composite coatings were deposited onto mild steel substrates by atmospheric plasma spraying of mixed α-Al^sub 2^O3 and nano-sized monoclinic-ZrO2 powders. Microstructural investigation showed that the coatings comprised well-separated Al^sub 2^O3 and ZrO2 lamellae, pores, and partially molten particles. The coating comprised mainly of metastable γ-Al^sub 2^O3 and tetragonal-ZrO2 with trace of original α-Al^sub 2^O3 and monoclinic-ZrO2 phases. The effect of ZrO2 addition on the properties of coatings were investigated in terms of microhardness, fracture toughness, and wear behavior. It was found that ZrO2 improved the fracture toughness, reduced friction coefficient, and wear rate of the coatings.[PUBLICATION ABSTRACT]
ISSN:1059-9630
1544-1016
DOI:10.1007/s11666-011-9672-7