In order to suggest brazing conditions of 304L stainless steel with Ag–Cu eutectic alloy containing oxygen, a wetting test and sandwich brazing test were performed. During the wetting tests, the contact angle slightly decreased with increasing temperature. In addition, as the oxygen content in the Ag–Cu alloy was controlled between 0.0212 and 0.0415 wt%, the contact angle became as low as about 70°–75° at 1093 K. From the sandwich brazing tests, with the oxygen-free Ag–Cu alloy, a number of macroscopic scale defects were observed, whereas the Ag–Cu alloy containing 0.0415 wt% oxygen showed a sound interface with the base metal. This may be caused by the removal or modification of the Cr2O3 oxide layer on the stainless steel surface by soluble oxygen and copper. The current experiments suggest that stainless steel brazing is possible with the Ag–Cu eutectic alloy by controlling the oxygen content without high vacuum application.
Bibliographical noteFunding Information:
This research was supported by the Space Core Technology Development Program (National Research Foundation of Korea, NRF-2012M1A3A3A02033446) and the Converging Research Center Program (National Research Foundation of Korea, NRF-2014M3C1A8053738) through the Ministry of Science, ICT & Future Planning.
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ASJC Scopus subject areas
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering