METHOD OF MANUFACTURING IMPELLER

摘要

The present invention relates to a method of manufacturing an impeller, comprising subjecting an assembly, which comprises at least two impeller constituent members and a brazing material comprising a Ni-containing Au alloy and arranged at a joint part between the impeller constituent members, to a thermal cycle. In the present invention, for the purpose of manufacturing an impeller by a brazing process while securing the toughness of a joint part, the temperature rising process in the thermal cycle is so adapted that the temperature rising rate is 20-100°C/hr. and a first intermediate retention and a second intermediate retention each retaining the temperature at a specific temperatures are involved, wherein the first intermediate retention is carried out in a temperature range of 500-850°C, the second intermediate retention is carried out in a temperature range of 850-950°C (but 850°C is excluded), and the temperature rising after the second intermediate retention and in a temperature range higher than 950°C is carried out at a rate that is lower than that employed before the second intermediate retention.