Structure and Growth Kinetics Features of Ceramic Coatings Produced on Ti-6Al-4V Alloy by Plasma Arc Oxidation

Shu Hua Li; Shen Wang; Yu Jun Yin; Kai Sun; Chen Wen Tan

doi:10.4028/www.scientific.net/KEM.512-515.1036

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 512-515Structure and Growth Kinetics Features of Ceramic...

Structure and Growth Kinetics Features of Ceramic Coatings Produced on Ti-6Al-4V Alloy by Plasma Arc Oxidation

Abstract:

Ceramic coatings were fabricated by plasma arc oxidation on Ti₆Al₄V alloy in phosphate –containing solution. The growth rate, microstructure and phase composition of ceramic coatings were investigated using coating thickness gauge, scanning electron microscope (SEM) and X-Ray diffraction (XRD). After plasma arc oxidation treatment, the microstructure of the remained Ti₆Al₄V alloy substrate remains unchanged and no hardening zone in the substrate is found. Ceramic coating formed on Ti₆Al₄V alloy surface by alternating-current plasma arc oxidation contains two layers: an outer layer and an inner layer. The outer layer coating consists of a large amount of rutile and a little anatase. But in the inner layer, anatase becomes a main phase while the rutile fraction obviously decreases, which indicates that phase transformation of anatase into rutile occurs in the duration of oxidizing process. In the mean time, with increasing treatment duration, coating growth varies from rapidness to tardiness accompanied by gradually roughening in appearance.

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Periodical:

Key Engineering Materials (Volumes 512-515)

Pages:

1036-1039

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.512-515.1036

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Online since:

June 2012

Authors:

Shu Hua Li, Shen Wang, Yu Jun Yin, Kai Sun, Chen Wen Tan

Keywords:

Ceramic Coating, Phase Composition, Plasma Arc Oxidation, Titanium Alloy

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References

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