Progress in research on green lead-free low-melting sealing glasses

Traditional sealing glasses, which contain heavy metal Pb, posing threat to humans and environment, have been restricted or forbidden by most countries. Therefore, lead-free of low-melting sealing glasses will be the main future development direction. This article based on lead-free of low-melting sealing glasses, the main properties of low-melting sealing glasses were summarized. First, the composition, structural characteristics, performance and research status of several main low-melting sealing glasses, such as phosphate glass, borate glass, vanadate glass and bismuthate glass were introduced. Second, the low temperature and lead-free development directions were put forward. At last, regarding the shortcomings in the research of low-melting sealing glasses, it was pointed out that the future focused breaking points for research are composite doping modification, theoretical research on glass and new technology development of glass preparation.