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It appears as if the failure occurs because of intermittent wetting to the AlBeMet. The alumina has been metallized with MoMg/Ni which is standard in the brazing industry. This surface wets well. The AlBeMet composition is 38Al-62Be.

Thanks for the ideas!

I am attempting to join small diameter AlBeMet (aluminum beryllium alloy) and sapphire tubing. Brazing in dry hydrogen with AuGe has been met with limited success and relatively weak joints. Any process suggestions or reference materials would be appreciated.

The method with the most success has been brazing in dry hydrogen using AuGe (88/12). Braze alloy wetting to the sapphire is good, but marginal to the AlBeMet which has been coated on the braze surfaces with Au.

The tubes are .056" OD x .032" ID. Sleeving the parts is highly undesireable. The design uses a butt joint (not the strongest design).

I am attempting to join an AlBeMet (aluminum/beryllium alloy) tube to an alumina tube and achieve a hermetic joint. The joint must be capable of withstanding 350 - 400C. Some limited success has been achieved but the joint is relatively weak. Any thoughts on joining materials and/or processes or...