Changes in the structure of materials in brazing niobium with sapphire using a glass–ceramic solder

Abstract

The changes in the structure of joints between sapphire and niobium produced by high-temperature brazing using a CaO–Al₂O₃ brazing alloy are investigated. The effect of temperature on the recrystallization processes in niobium and its alloys with zirconium on the formation of the second phase in the CaO–Al₂O₃ system and the diffusion of niobium in the glass–ceramic solder is investigated. The optimum conditions of brazing the niobium alloy with sapphire are determined.

Keywords:

• Structure
• sapphire
• niobium
• glass solder
• recrystallization
• junction
• sealed lead
• second phase
• alumina
• calcium oxide

Notes

Selected from Svarochnoe Proizvodstvo, 2015, 68 (9) 21–27.