Research and Application of Silver-based Brazing Alloys in Manufacturing Industries: a Review
WANG Xingxing1, PENG Jin1, CUI Datian1, XUE Peng2, LI Hong3, HU Anming3, SUN Guoyuan1
1 School of Mechanical Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045; 2 School of Materials Science and Engineering,Nanjing University of Science and Technology, Nanjing 210094; 3 College of Materials Science and Engineering, Beingjing University of Technology, Beijing 100124
Abstract: The properties of the brazing filler metals largely decide the quality of brazed joints and application field of brazing filler metals. As an important brazing filler metal, the silver-based brazing alloy possesses excellent filling capacity and high strength(close to brass and low carbon steel), which can braze nearly all the metals except aluminum alloys, magnesium alloys and other light metal materials. Consequently, silver-based brazing alloy has been widely used in aerospace, super-hard tools and other manufacturing industries, and aroused extensive attention of researchers at home and abroad. Nevertheless, there are still some problems in the development and application of silver-based brazing alloys. Ⅰ. The high silver content always leads to high costs of filler metals. Ⅱ. The inclusions can’t be avoided during the process of extrusion, rolling, dra-wing and so forth, which are harmful to the performance and quality of brazed joints. Ⅲ. The mechanism of controlling the properties of brazing alloys and brazed joints by adding beneficial pure metal or alloys is still confused. Ⅳ. The production efficiency of silver-based brazing alloys by traditional process is low. Ⅴ. The application of silver-based brazing alloys in manufacturing industry has not been reported systemically. The research on the brazed joints and engineering applicationsof the silver-based brazing alloys at home and abroad mainly focus on the following aspects. (Ⅰ) Develop brazing alloys with lower silver content. It mainly use selected element to modify the connection properties of brazed joints. (Ⅱ) Improve traditional preparation methods of silver-based brazing alloys, namely, propose new methods, such as powder electromagnetic suppression forming, original position synthesis in brazing process, rapid solidification, coating diffusion etc. (Ⅲ) Study the effect of impurity elements, like C, Ca, S, Al, Fe, Bi, Pb, O, N etc. (Ⅳ) Design silver-based brazing alloys with innovative shape, such as sandwich-like, foil and Sn-plated filler metals etc. (Ⅴ) Explore engineering application. Silver-based brazing alloys have been widely applied in aerospace, automobile manufacturing, electric energy, while it still lack intensive study on industrial application. Accordingly, this article reviews the relevant researches on silver-based brazing alloys in recent 20 years, and mainly focus on the effect of alloying elements on the properties of silver-based brazing alloys. First of all, the research status of silver-based brazing alloys is outlined. The effects of Cu, Zn, Sn, Ga, In, Ni, Mn, Cd, Li, Ce, La, P, Si, Pr on silver-based brazing alloys are summarized, including their advantages and disadvantages. Meanwhile, the negative effects of C, S, O, N, Ca, Al, Fe, Pb and Bi are pointed out. Secondly, the applications of silver-based brazing alloys in manufacturing industries, including aerospace, automobile manufacturing, electric energy, super-hard tools, household appliances, optics are concluded in detail. At last, the existing problems in the research and application of silver-based filler metals are put forward, which will provide theoretical guidance for the in-depth systematic study of silver-based brazing alloys.
王星星,彭 进,崔大田,薛 鹏,李 红,胡安明,孙国元. 银基钎料在制造业中的研究进展[J]. 《材料导报》期刊社, 2018, 32(9): 1477-1485.
WANG Xingxing, PENG Jin, CUI Datian, XUE Peng, LI Hong, HU Anming, SUN Guoyuan. Research and Application of Silver-based Brazing Alloys in Manufacturing Industries: a Review. Materials Reports, 2018, 32(9): 1477-1485.
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2018, Vol. 32 
