Tohoku Univ. Technology: Multilayer ceramics and methods of production : T21-249

Improves the coating of metals and metal compounds, prevents peeling and cracking, and ensures corrosion resistance!

Silicon carbide materials and silicon carbide fiber-reinforced composites are expected to replace Zircaloy and other metals as structural materials for next-generation nuclear reactors. However, these materials require anticorrosion coatings when they are exposed to radiation, high temperatures, and high-pressure water. Although metal coatings have been used in the past, there has been a problem that they cannot fully exert their anticorrosion function due to delamination and cracking of the substrate caused by thermal expansion coefficient differences and swelling differences.　 　A silicon carbide layer, an intermediate layer and a coating layer are laminated on a substrate. As a result, it has become possible to provide a silicon carbide material or a silicon carbide fiber-reinforced composites composed of full ceramics with improved anticorrosion function by alleviating thermal expansion coefficient difference and swelling difference with a base material.

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