METHOD FOR PRODUCING ALUMINUM ALLOY HEAT EXCHANGER

WIPO Patent Application WO/2011/148781

A1

Provided is a method for producing an aluminum alloy heat exchanger formed by applying a coating material, which is obtained by mixing an Si powder, a flux powder, and a binder, to the surface of a flat, multi-hole coolant tube formed from an aluminum alloy extruded material, attaching an aluminum alloy bare fin and brazing the resulting product. The coolant tube is formed from the extruded material of an aluminum alloy that comprises 0.5 to 1.7% of Mn, less than 0.10% of Si, and less than 0.10% of Cu, with the remainder being Al and inevitable impurities. The fin is a corrugated fin obtained by molding an Al-Mn-Zn alloy material. The coating material is obtained by mixing an Si powder, a compound flux powder containing Zn, a Zn-free compound flux powder, and a binder. The amount of the Si powder applied is 1 to 4 g/m2. The potential is the highest in a deep section of the coolant tube of the heat exchanger produced by means of brazing, and the potential decreases in the order of the coolant tube surface, a fin joint fillet, and the fin.

YAMASHITA Naoki (11-3, Shinbashi 5-chom, Minato-ku Tokyo 01, 〒1058601, JP)
山下　尚希 (〒01 東京都港区新橋５丁目１１番３号　住友軽金属工業株式会社内 Tokyo, 〒1058601, JP)

JP2011/060729

December 01, 2011

May 10, 2011

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SUMITOMO LIGHT METAL INDUSTRIES, LTD. (11-3, Shinbashi 5-chome Minato-ku Tokyo, 01, 〒1058601, JP)
住友軽金属工業株式会社 (〒01 東京都港区新橋５丁目１１番３号 Tokyo, 〒1058601, JP)
YAMASHITA Naoki (11-3, Shinbashi 5-chom, Minato-ku Tokyo 01, 〒1058601, JP)

B23K1/00; B23K1/19; B23K35/363; C22C21/00; C22F1/04; F28F1/30; F28F21/08; B23K101/14; B23K103/10; C22F1/00

FUKUDA Yasuo et al. (Hongo Bldg. 5F, 1-16 Kanda Suda-ch, Chiyoda-ku Tokyo 41, 〒1010041, JP)

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