Abstract
The Ni3, (Si, Ti, Hf) intermetallic compound full of the promise as a heat-resistant and anti-sulfuric acid material was preliminarily brazed using commercial Ni-based filler metals, and some properties of the joints were examined. According to the preliminary examination, a new Ni-based filler metal was developed to improve the characteristics of the joint. The results obtained in this study are as follows:
The commercial filler metals which contain some contents of boron or phosphorous to decrease the melting point can not provide us sound brazed joints due to the formation of brittle phases in the bonded interlayer.
A Ni based filler metal added some contents of copper as an element to decrease the melting point instead of boron or phosphorous was successfully developed, and it enables us to make sound brazed joints of which the tensile shear strength is approximately equal to that of the base metal.
And the joints brazed with this filler metal also exhibit excellent corrosion resistance to sulfuric acid solution.
