Ultrafine Na-Sr-Si precursor powder for sealing glass via sol-gel route

作者：Chen Hai Lin^*; Hwu Wen Hwa; Lu Kai Tai; Lee Woei Shyong

来源：Journal of the Chinese Institute of Engineers, 2011, 34(6): 783-791.

DOI：10.1080/02533839.2011.591549

• sealing glass
• sol-gel method
• ultrafine precursor powder
• thermal expansion coefficient

Sealing glasses have been widely used as insulating and sealing materials in the electronics industry. In this study, ultrafine Na-Sr-Si precursor powder was synthesized from sodium nitrate (NaNO(3)), strontium nitrate Sr(NO(3))(2), and tetraethoxy orthosilicate (TEOS) via the sol-gel method. Nitric acid (HNO(3)) or ammonia (NH(4)OH) was used as acid or base catalysts, respectively, to achieve miniaturization of particles. The products were characterized by X-ray diffraction, scanning electron microscope, and thermogravimetric/differential thermal analyzer. The results showed that the mean particle size for acid-catalyzed Na-Sr-Si glass precursor powder was approximately 100-700 nm, and appeared to be smaller than that for base-catalyzed Na-Sr-Si glass precursor powder. This glass precursor powder synthesized by sol-gel process has a low processing temperature of about 850-900 degrees C compared with the processing temperature of similar to 1400 degrees C for traditional glass precursor powder. Furthermore, the coefficient of thermal expansion of this sealing glass was in the range 6.575 x 10(-6)-9.136 x 10(-6)degrees C(-1), measured by the thermal mechanical analyzer.

• 出版日期2011-9
• 单位中国人民解放军国防大学