Effect of Heat Treatment on Structure and Properties of Sol-Gel Bi2O3-B2O3-SiO2 Glassy Powder
LI Peixian1, YUAN Gecheng1, LU Zhenghua1, LI Qian1,LE Yingfeng1, WU Qiguang2
1 School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006 ; 2 Analysis and Test Center, Guangdong University of Technology, Guangzhou 510006
Abstract: The glassy powder of Bi2O3-B2O3-SiO2 was prepared by sol-gel method. In order to study the effect of heat-treated temperature on structure and properties of the powder, it was heated at temperature of 200 ℃,400 ℃,600 ℃,800 ℃,respectively. The structure and properties of the glassy powder under various heat-treated temperature were tested by means of SEM, TEM, XRD, FT-IR, Raman, XPS, DSC, thermal dilatometer and ‘button-sintering’, respectively. The effect of the powder structure change on its transition temperature Tg and sintering properties was analyzed. The results show that Bi3+get into the network structure with the rising of heat-treated temperature,[BiO6] octahedral and [BiO3] triangle, [BO4] tetrahedron and [BO3] triangle connect with [SiO4] tetrahedron separately in the way of vertex connecting to build the network structures. The O1s and Bi4f binding energies increase gradually while the B1s binding energies decrease which strengthen the stability of glass structure. All of these structure changes cause the increase of transition temperature Tg and softening temperature Td, the decrease of wettability and slight increase of thermal expansion coefficient of the glass powder. The glass powder treated at 600 ℃has better sintering characteristics, the Tg, Td is approximately 485 ℃and 542 ℃,respectively, and the thermal expansion coefficient is close to 7.067×10-6/℃.
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