| 摘要 |
A brazing agent comprises an aluminum alloy which contains a flux, the agent having an apparent density of 90 % or more of a theoretical density, the aluminum alloy comprises in addition to the flux: aluminum element; and silicon element at about 3 - 15 % by weight of all the elements other than the flux, so that the ratio in weight of all the elements to the flux is from 99.9 : 0.1 to 70 : 30. The aluminum alloy may further contain one or more elements selected from a group consisting of zinc, tin and indium, at about 0.1 - 5 %, 0.01 - 0.5 % and 0.01 - 0.5 % by weight of all the elements, respectively. A brazing sheet may be of such a structure that a core sheet made of aluminum or its alloy has at least one surface clad with a skin layer which has a thickness of 10 .mu. m or more for each surface.
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