Patent ID: 6200642
Filing Date: 2001-03-13
Classification: B23K,C23C

Abstract:
A method of producing a brazeable aluminum material composed of an aluminum core, the method comprising the steps of:preparing a first powder as well as a second powder;wherein the first powder is one or more brazing metal powders selected from a group consisting of a mixture of Al and Si powders, an Al-Si alloy powder and a Si powder, and the second powder is a zinc powder or a Zn alloy powder and an average diameter of the first powder is from about 10 .mu.m to about 200 .mu.m and an average diameter of the second powder is from about 10 .mu.m to about 200 .mu.m;then blending the first powder with the second powder so as to form a powder mixture, wherein a ratio by weight of the first powder to the second powder in the powder mixture is from about 30:70 to about 95:5; andthermally spraying the powder mixture onto the aluminum core so as to form a thermally sprayed layer, with particles of the second powder being molten while particles of the first powder remain either solid or with molten surfaces, wherein the thermally sprayed layer has a thickness of 10 .mu.m or more and comprises a plurality of particles of brazing metal dispersed in Zn or Zn alloy, and Zn content of the thermally sprayed layer is from about 6 g/m.sup.2 to about 20 gm.sup.2.