| 摘要 |
A single component brazing paste suitable for brazing aluminum and having excellent shelf-life consists essentially of a mixture of (A) from 7 to 35, preferably at least 10, weight percent of a non-aqueous substantially inert vehicle which has a viscosity at room temperature in the range of 30,000 to 100,000 centipoises and which at brazing temperature is capable of volatilization and/or decomposition without leaving a residue, (B) from 18 to 75, preferably at least 25, weight percent of certain brazing fluxes suitable for use in brazing aluminum and containing no metals in free or combined form having a more negative or less positive oxidation potential than aluminum, (A) and (B) when mixed together having a viscosity at room temperature greater than the viscosity of (A) alone and in the range of 80,000 to 250,000 centipoises, and (C) from 15 to 75 percent weight of a particulate aluminum base alloy filler metal such that the mixture of (A), (B) and (C) has a viscosity at room temperature in the range of 200,000 to 1,000,000 centipoises. Preferably, the weight ratio of (B) to (A) is from 1:1 to 3:1. Also the preferred weight ratio of (B) to (C) is less than 1:1, more preferably no greater than about 0.8:1.
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