Other

Hitachi, Ltd.

The Tokyo Electric Power Company, Incorporated

Ryuta Watanabe

Yoshitaka Kojima

Yoshiaki Matsushita

Katsuo Wada

Hideyuki Arikawa

Mitsuo Haginoya

Shin Yoshino

A ceramic-coated blade of a gas turbine and a method of producing the same, in which the thickening of an Al O layer at the interface between a ceramic layer and a primary layer is sufficiently prevented for a long period of time, thereby positively suppressing the separation of the ceramic layer. Using powder of MCrAlY alloy (Co&mdash;32%Ni&mdash;21%Cr&mdash;8%Al&mdash;0.5%Y), a primary layer (alloy coating layer) is formed on a surface of a substrate made of a heat-resistant Ni base alloy (Rene'-80). Further, a heat-resistant ceramic layer, comprising a mixture of ion-conductive ZrO &mdash;8wt. %Y O ceramic and insulative ceramic (e.g. Al O ), is formed on the alloy coating layer. This mixture has a columnar structure in which columnar crystals are grown by a gas phase in a direction of a thickness of the coating, or a porous structure in which flattened particles brought about from molten particles caused to fly at high velocity are laminated.

Method for producing a ceramic-coated blade of gas turbine

A ceramic-coated blade of a gas turbine and a method of producing the same, in which the thickening of an Al.sub.2 O.sub.3 layer at the interface between a ceramic layer and a primary layer is sufficiently prevented for a long period of time, thereby positively suppressing the separation of the ceramic layer. Using powder of MCrAlY alloy (Co-32% Ni-21% Cr-8% Al-0.5% Y), a primary layer (alloy coating layer) is formed on a surface of a substrate made of a heat-resistant Ni base alloy (Rene'-80). Further, a heat-resistant ceramic layer, comprising a mixture of ion-conductive ZrO.sub.2 -8 wt. % Y.sub.2 O.sub.3 ceramic and insulative ceramic (e.g. Al.sub.2 O.sub.3), is formed on the alloy coating layer. This mixture has a columnar structure in which columnar crystals are grown by a gas phase in a direction of a thickness of the coating, or a porous structure in which flattened particles brought about from molten particles caused to fly at high velocity are laminated.

Ceramic-coated blade of gas turbine and method of producing same

Growing community of inventors

Mobara, Japan

Ryuta Watanabe