Accession Number : ADD014696

Title :   Method of Soldering Aluminum.

Descriptive Note : Patent, Filed 29 Aug 89, patented 25 Sep 90,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Divecha, Amarnath P ; Ferrando, William A ; Hesse, Philip W ; Karmarkar, Subhash D

Report Date : 25 Sep 1990

Pagination or Media Count : 3

Abstract : 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)

Descriptors :   *ALUMINUM ALLOYS, ALUMINUM, LAYERS, NITRATES, SILVER, SILVER COMPOUNDS, SOLDERING, SURFACES, THINNESS

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE