公开(公告)号：EP1862251A4

公开(公告)日：2009-07-29

申请号：EP06729784

申请日：2006-03-23

申请人： JEMCO INC ,  MITSUBISHI MATERIALS CORP

发明人： HONDA KAZUYOSHI ,  SAITOH SATORU

IPC分类号： B23K35/363 ,  B23K35/40

CPC分类号： B23K35/3605

摘要： A flux powder which has satisfactory spreading properties when used in brazing magnesium-containing aluminum materials. It is noncorrosive, highly safe, relatively inexpensive, highly economical, and generally usable extensively. It is an improved flux powder for use in the brazing of aluminum materials having a magnesium content of 0.1-1.0 wt.%. It comprises KAlF 4 , K 2 AlF 5 , and K 2 AlF 5 ·H 2 O. It is characterized in that it has composition in which the K/Al molar ratio is 1.00-1.20, the F/Al molar ratio is 3.80-4.10, and the total content of K 2 AlF 5 and K 2 AlF 5 ·H 2 O is 6.0-40.0 wt.%, with the remainder being KAlF 4 , and that part or all of the crystal structure of the K 2 AlF 5 ·H 2 O is at least one of K-deficient type, F-deficient type, and K- and F-deficient type crystal structures.