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

Abstract:

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.

• Periodical: Defect and Diffusion Forum (Volumes 297-301)
• Pages: 1395-1399
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.297-301.1395
• Online since: April 2010
• Authors: Erdem Atar, E.S. Kayali, H. Çimenoğlu
• Keywords: Coating, Hafnium, Hardness, Oxidation, PVD, ZrN

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