US 12,447,561 B2
Copper-phosphorus brazing foil and preparation method thereof
Sujuan Zhong, Henan (CN); Xian Dong, Henan (CN); Yinyin Pei, Henan (CN); Yafang Cheng, Henan (CN); Junlan Huang, Henan (CN); Hangyan Xue, Henan (CN); Mengjie Nie, Henan (CN); and Wenbin Li, Henan (CN)
Assigned to ZHENGZHOU RESEARCH INSTITUTE OF MECHANICAL ENGINEERING CO., LTD., Henan (CN)
Filed by ZHENGZHOU RESEARCH INSTITUTE OF MECHANICAL ENGINEERING CO., LTD., Henan (CN)
Filed on Feb. 14, 2023, as Appl. No. 18/169,194.
Claims priority of application No. 202210676978.4 (CN), filed on Jun. 15, 2022.
Prior Publication US 2023/0405733 A1, Dec. 21, 2023
Int. Cl. B23K 35/02 (2006.01); B23K 35/30 (2006.01); B23K 35/40 (2006.01)
CPC B23K 35/0238 (2013.01) [B23K 35/302 (2013.01); B23K 35/40 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A method for preparing a copper-phosphorus brazing foil wherein the copper-phosporus brazing foil comprises a copper inner core and a copper-phosphorus alloy layer coating on an outside of the copper inner core, and a phosphorus content in the copper-phosphorus brazing foil is more than or equal to 5w %, and a thickness of the copper-phosphorus brazing foil is less than or equal to 0.5 mm; a red copper foil is used as a core layer, and a surface of the red copper foil is alloyed to form a layer of copper-phosphorus alloy by an eutectic reaction between the core layer and red phosphorus, so as to obtain the copper-phosphorus brazing foil.