The Effect of Oxidation on The Structure and Hardness of (Zr, Hf)N Coatings

Abstract:

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In the present study, the effect of oxidation on the structure and the hardness of ternary (Zr, Hf)N coatings, whose Hf content was varied between 0 and 21 wt.%, has been systematically examined. Coatings were applied on AISI D2 tool steel plates by arc physical vapor deposition (PVD). Oxidation was conducted at 400oC for times up to 12 h in air. Ternary (Zr, Hf)N coatings are found to be more susceptible towards oxidation compared to binary ZrN coating. Oxidation caused the formation of a mixed oxide layer composed of ZrO2 and HfO2. Formation of oxide layer was accompanied by a reduction in hardness. Hardness values of Hf free and Hf alloyed (Zr, Hf)N coatings were very close to each other both in as-deposited and oxidized states.

Info:

Periodical:

Defect and Diffusion Forum (Volumes 297-301)

Edited by:

Andreas Öchsner, Graeme E. Murch, Ali Shokuhfar and João M.P.Q. Delgado

Pages:

1395-1399

DOI:

10.4028/www.scientific.net/DDF.297-301.1395

Citation:

E. Atar et al., "The Effect of Oxidation on The Structure and Hardness of (Zr, Hf)N Coatings", Defect and Diffusion Forum, Vols. 297-301, pp. 1395-1399, 2010

Online since:

April 2010

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Price:

$35.00

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