Mitsubishi Heavy Industries Limited

Mitsubishi Heavy Industries Compressor Corporation

Daisuke Kawada

Daisuke Tanaka

Hiroshi Nakajima

Kazutoshi Yokoo

Hiroki Takagi

Yujiro Watanabe

Koshiro Niihara

The present invention relates to an impeller manufacturing method in which a thermal cycle is performed on an assembly body with a brazing material formed of a Ni-containing Au alloy being placed at a bond portion of at least two impeller constituent members. The thermal cycle includes a temperature increasing process with a temperature increasing rate of 20&#xb0; C./hr. to 100&#xb0; C./hr., the process including a first intermediate retention and a second intermediate retention each keeping the temperature, the first intermediate retention performed in a temperature range of 500&#xb0; C. to 850&#xb0; C. and the second intermediate retention performed in a temperature range of 850&#xb0; C. to 950&#xb0; C. (but not including 850&#xb0; C.). In the thermal cycle, the temperature is increased in a temperature range exceeding 950&#xb0; C. after the second intermediate retention at a rate lower than that before the second intermediate retention.

Impeller brazing method

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Tokyo, Japan

Daisuke Kawada