ALUMINUM ALLOY HEAT EXCHANGER AND METHOD OF PRODUCING REFRIGERANT TUBE USED FOR THE HEAT EXCHANGER

摘要

An aluminum alloy heat exchanger is produced by applying a coating material that is prepared by adding a binder to a mixture of an Si powder and a Zn-containing compound flux powder to a surface of an aluminum alloy refrigerant tube, assembling a bare fin that is formed of an Al—Mn—Zn alloy with the refrigerant tube, and brazing the refrigerant tube and the bare fin by heating in an atmosphere-controlled furnace, the refrigerant tube being an extruded product of an aluminum alloy that comprises 0.5 to 1.7% (mass %, hereinafter the same) of Mn, less than 0.10% of Cu, and less than 0.10% of Si, with the balance being Al and unavoidable impurities.

主权项

1. A method of producing an aluminum alloy refrigerant tube that is used in the manufacture of an aluminum alloy heat exchanger, comprising the steps of:
providing an ingot of an aluminum alloy comprising 0.5-1.7 mass % of Mn, less than 0.10% of Cu and less than 0.10% of Si, with the balance being Al and unavoidable impurities; subjecting the ingot of the aluminum alloy to a homogenization heat treatment that holds the ingot at a temperature of from 400-650° C. for 4 hours or more; and hot-extruding the ingot.