Nippon Steel Corporation

Shumpei Miyajima

Wataru Ito

Misao Hashimoto

Tadashi Komori

Isao Itoh

Isao Ito

A ceramic single layer-coated metal sheet having an excellent decorative property and a high weatherability, which comprises a metal substrate and a transparent ceramic layer formed on the metal substrate by a dry process such as physical vapor deposition or chemical vapor deposition, said transparent ceramic layer having a thickness of 0.05 to 5 .mu.m and a refractive index in the visible region of at least 2.0. A ceramic multiple layer-coated metal sheet having an excellent decorative property and a high weatherability is also disclosed, which further comprises a colored ceramic layer between the substrate and the transparent ceramic layer, the first layer being formed of at least one member selected from the group consisting of nitrides, carbides and carbonitrides of at least one element selected from the group consisting of Ti, Zr, Hf, Cr, Nb and Al and having a thickness of 0.1 to 1 .mu.m.

Ceramic-coated metal sheet

A metal plate is given an excellent decorative color by a multi-ceramic coating of a colored ceramic layer formed over the metal plate, the colored ceramic layer being made of at least one selected from the group consisting of nitrides and carbides of titanium, zirconium, hafnium, chromium, niobium, and aluminum and having a thickness of 0.1 .mu.m to 1 .mu.m; and a transparent ceramic layer formed over the colored ceramic layer, the transparent ceramic layer being made of at least one of the group consisting of silicon oxide, silicon nitride, and aluminum oxide and having a thickness of 0.1 .mu.m to 5 .mu.m. The depositions of the colored and transparent ceramic layers are effected by a dry process, and the order of deposition of the colored and transparent ceramic layers can be reversed.

Process for manufacturing multi ceramic layer-coated metal plate

A metal plate is given an excellent decorative color by a multi-ceramic coating of a colored ceramic layer formed over the metal plate, the colored ceramic layer being made of at least one selected from the group consisting of nitrides and carbides of titanium, zirconium, hafnium, chromiun, niobium and aluminum and having a thickness of 0.1 .mu.m to 1 .mu.m ; and a transparent ceramic layer formed over the colored ceramic layer, the transparent ceramic layer being made of at least one of the group consisting of silicon oxide, silicon nitride and aluminum oxide and having a thickness of 0.1 .mu.m to 5 .mu.m. The depositions of the colored and transparent ceramic layers are effected by a dry process, and the order of deposition of the colored and transparent ceramic layers can be reversed.

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Kawasaki, Japan

Shumpei Miyajima