A process for the preparation of an extrusion tool for the extrusion of aluminum or aluminum alloys

摘要

There is disclosed an aluminum or aluminum alloy extruding die, which comprises Co-group alloy, Ni-group alloy, Cr-group alloy or like high temperature wear-resistant alloy coating applied by thermal spraying on a required die surface portion having been formed in the shape of a rough surface having surface roughness Rz of 5 µm or more. Preferably, after application of the alloy coating, the die is held at a temperature in the range from 500 to 800°C for a predetermined period of time or the alloy coating surface is so roughened as to have surface roughness Rz of 10 µm or less.