The ultrafine sealing glass precursor powders were fabricated using the sol-gel method

• Main Authors: Chung Hsin Ao, 鍾昕璈
• Other Authors: Wen-Hwa Hwu
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/29365527151958164342

碩士 === 國防大學中正理工學院 === 應用化學研究所 === 93 === Sealing glasses are extensively used in electronic industries as insulation and sealing materials. The ultrafine sealing glass precursor powders were fabricated using the sol-gel method in this study. The crystallization processing was performed by the sintering to make the glass with mechanical, chemical and physical properties, such as the thermal resistance, the anti-corrosion and high pressure resistance. The preoxidation was utilized on the alloy surface. The metal surface structure was improved with higher chemical bondings and perfect wetting. Finally, the glass and metal were jointed by the hermetic sealing technique. Sodium strontium silicate glass precursor powders were synthesized by the sol-gel process using sodium nitrate (NaNO3), strontium nitrate (Sr(NO3)2) and tetraethoxyorthosilicate (TEOS). Followed by the heat treatment, sodium strontium silicate glasses were obtained. The mean particle size of the glass precursor powder was approximately 100~500 nm. The sodium strontium silicate glass precursor powder can be treated below 850℃ in air. The melting point of the sodium strontium silicate glass was in the range of 850~880℃. The thermal expansion coefficient of the sodium strontium silicate glass was in the range of 6.575×10-6~9.136×10-6 ℃-1 . The physical and thermal properties of glass precursor powder and glass powder were characterized by the thermogravimetry analysis, the differential thermal analysis, and the thermomechanical analysis. The microstructure of the glasses were observed by the scanning electron microcopy.