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

摘要

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 (NaNO₃), strontium nitrate Sr(NO₃)₂, and tetraethoxy orthosilicate (TEOS) via the sol-gel method. Nitric acid (HNO₃) or ammonia (NH₄OH) 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°C compared with the processing temperature of 1400°C for traditional glass precursor powder. Furthermore, the coefficient of thermal expansion of this sealing glass was in the range 6.575 × 10−6-9.136 × 10−6°C−1, measured by the thermal mechanical analyzer.View full textDownload full textKeywordssealing glass, sol-gel method, ultrafine precursor powder, thermal expansion coefficientRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/02533839.2011.591549