Construction of an experimental set-up for brazing stainless steel samples in low vacuum atmosphere consisting monosilane-doped argon

摘要

The current project includes the construction and the design of an experimental set-up for the heat treatment and brazing of stainless steel samples in low vacuum atmosphere. Therefore a concept is designed using positive experiences from brazing in protective gas atmosphere with addition of monosilane-doped argon. The requirements for the heat treatment and brazing of selected stainless steel samples (1.4301, 1.4762) have been determined in wettability-tests performed in high vacuum. To combine both aspects an apparatus is designed, which allows to stream in a controlled composition of monosilane-doped argon, while evacuating to low vacuum atmosphere simultaneously. The heat source is realized by a PID-controlled vertical tubular furnace, while the composition of monosilane-doped argon is taxed by a mass-flow control unit. In this paper, the design and the conception of the apparatus is presented and first operating-tests are introduced.