| 摘要 |
PURPOSE:To prevent a variation of a brazing property caused by a change of a brazing temperature, and to execute brazing at a low temperature by brazing each aluminum by using a flux which has mixed aluminum potassium fluoride, potassium nitrate and zinc nitrate of a limited quantity. CONSTITUTION:A brazing flux is constituted by mixing 1-10% potassium nitrate and zinc nitrate to 90-99% aluminum potassium fluoride by a weight ratio. In this regard, if a mixing quantity of aluminum potassium fluoride is under the limit, an oxide existing on both surfaces of aluminum cannot be removed, and if it exceeds, a brazing temperature cannot be lowered. Also, if the mixing quantity of potassium nitrate and zinc nitrate is under the limit, the brazing temperature cannot be lowered, and if it exceeds the limit, an oxide existing on both the aluminum surfaces cannot be removed. |
