| 摘要 |
PURPOSE:To provide a flux for brazing an aluminum material which is decreased in the m. p. without spoiling the advantage intrinsic to a fluoride flux by incorporating transition alumina and Al(OH)3 in potassium fluoroaluminate or a mixture composed thereof and AlF3. CONSTITUTION:A flux for brazing an Al material is incorporated with 100pts.wt. potassium fluoroaluminate having the structure of 60:40-50:50 in the ratio of AlF3/KF or a mixture composed dereof and AlF3 and 1-8pts.wt., more preferably 3-7pts.wt. transition alumina such as rho alumina and Al(OH)3 in terms of an alumina-component. Such flux is mixed with water to prepare a slurry which is then coated on the joint surfaces to be brazed of the Al material. A brazing material is disposed on the coated surface and the joint surfaces are joined by brazing under heating. The brazing from the neighborhood of about 56 deg.C lower by 30-40 deg.C than with the conventional fluoride flux is made possible by using such flux. |
