Practical application study of lead oxide-free low melting glass based on bismuth oxide

2003 Fiscal Year Final Research Report Summary

• Project/Area Number: 13555244
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 展開研究
• Research Field: 無機工業化学
• Research Institution: Niihama National College of Technology
• Principal Investigator: NITTA Atsumi Niihama National College of Technology, Department of Materials Engineering, Associate Professor, 材料工学科, 助教授 (40300636)
• Co-Investigator(Kenkyū-buntansha): MICHIMATA Toru ALPS Electric Co. Ltd., Magnetic Device Division, Chief Engineer, 第3技術部材料, 主任技師 ; 小出 学 長岡技術科学大学, 工学部, 助手 (10272866) ; 松下 和正 長岡技術科学大学, 工学部, 教授 (80024610) ; SUZUKI Kenichi NAMICS Corporation, R & D Department, General Manager, 総括部長
• Project Period (FY): 2001 – 2003
• Keywords: bismuth oxide / low melting glass / glass transition temperature / glass-forming region / water resistance / intermediate oxide / thermal expansion / density

Research Abstract

We studied on glass-forming regions, thermal properties and water resistant test of lead oxide-free low melting glass based on bismuth oxide. We found the following results.
(1)Bi_2O_3-B_2O_3-Li_2O, Bi_2O_3-B_2O_3-BaO, Bi_2O_3-B_2O_3-ZnO ternary systems have wide glass-forming regions.
(2)The glass transition temperature (Tg) of Bi_2O_3-B_2O_3-X ternary glasses containing a 3rd component which are alkaline oxides, alkaline earth oxides, and intermediate oxides is 270 to 547℃. Increase of AI_2O_3 and TiO_2 in Bi_2O_3-B_2O_3-Al_2O_3 and Bi_2O_3-B_2O_3・TiO_2 ternary glasses hardly rises the Tg of these glasses.
(3)The water resistance of Bi_2O_3-B_2O_3-ZnO, Bi_2O_3-B_2O_3-TiO_2 and Bi_2O_3-B_2O_3-Zr0_2 ternary glasses are nearly equal to that of 50SiO_2-50PbO(mol%) glass.
We think that it has the possibility that as for the bismate glasses in this study, it is applied to some electronic devices from the above results.