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Method of Soldering Aluminum.
Patent, Filed 29 Aug 89, patented 25 Sep 90,
DEPARTMENT OF THE NAVY WASHINGTON DC
Pagination or Media Count:
An aluminum or aluminum alloy surface is coated with molten AgNO3, the silver nitrate is decomposed at about 450 C-550 C leaving a thin layer of silver metal, and then an inter-diffusion layer of silver and aluminum is formed at about 570 C-660 C. The treated surface can be soldered by conventional means. Molten AgNO3 MP 212 C is coated on to the aluminum or aluminum alloy surface which is to be soldered. The molten AgNO3 is applied at a temperature above the melting point of AgNO3, but below the decomposition temperature of AgNO3. The surface is heated to keep the AgNO3 molten after it is applied. The molten AgNO3 wets and spreads out evenly over the aluminum surface. PAT-CL-228-193. JS
APPROVED FOR PUBLIC RELEASE