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TiAlN/TiMoN Coatings as Hydrogen Barriers



Author(s)

Motonori Tamura¹ and Hidekazu Takizawa²

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DOI:10.17265/2161-6213/2019.1-2.001

1. The University of Electro-Communications, Tokyo 182-8585, Japan
2. OKAYA Heat Treating Co., Ltd., Nagano 394-0033, Japan

We evaluated the hydrogen barrier properties of a multi-layered coating of TiAlN/TiMoN. Coatings facilitated reductions of the hydrogen permeabilities to 1/1,000 of that of the uncoated substrate. The experiment confirmed that the coatings composed of fine crystal grains were highly effective as hydrogen barriers, and that this barrier property became even more efficient if multiple layers of the coatings were applied. The crystal grain boundaries of the coating and interfaces of each film in a multi-layered coating can serve as hydrogen trapping sites. We speculate that fine crystal structures with multiple crystal grain boundaries and multi-layered coating interfaces will contribute to the development of hydrogen barriers.

Hydrogen permeation, multi-layered-coating, microstructure, hydrogen traps.