HEAT EXCHANGER TUBE, HEAT EXCHANGER, AND BRAZING PASTE
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United States of America Patent
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Apr 27, 2015
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May 26, 2014
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A heat-exchanger tube has a tube main body composed of an aluminum alloy. A coating is applied onto a surface of the tube main body. The coating contains a powder mixture—which includes: 1 g/m2 or more and 7 g/m2 or less of an Si powder, 0.2 g/m2 or more and 4.0 g/m2 or less of a Zn powder, 0.5 g/m2 or more and 5.0 g/m2 or less of a first flux powder composed of a compound that contains Zn, and 5 g/m2 or more and 20 g/m2 or less of a second flux powder composed of a compound that does not contain Zn—and a binder. The total amount of the powder mixture in the coating is 30 g/m2 or less. The proportion of the binder in the coating is 5-40 mass %.
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