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| Laser Materials Processing Division |
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Materials joining for in-house applications
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Alumina-Alumina brazing for application in vacuum chambers of proton synchrotron
- Conventional route adopted for alumina-alumina brazing is: multi-step Mo-Mn metallization of faying alumina surfaces followed by their brazing with BVAg-8 alloy.
- Alternative joining approach is advanced single-step active brazing with CuSil-ABA alloy.
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Table-1: Strength of brazed joints |
Brazing route |
Tensile strength |
Flexural strength |
Metallization |
35 MPa |
149 MPa |
Active brazing |
62 MPa |
110 MPa |
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Highlights:
- The results of in-house study has demonstrated that active brazing is the simple and cost effective alternative to conventional metallization route for producing sound, strong, heremticaly sealed (helium leak rate ≤ 2 x 10-10 mbar.lit/s) and bakeable brazed joints.
Fig.1: Vacuum brazed alumina specimens. |
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Fig.2: Cross-sections of vacuum brazed alumina specimens, prepared through (A) metallization and (B) active brazing routes. |
Publications: D. P. Yadav et al. Materials & Design, 64, 2014, 415-422.
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