(中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083)
摘 要: 制備摻雜Nd2O3的Na2O-CaO-SiO2(NCS)系高結(jié)晶度透明微晶玻璃。通過DSC測定，確定基礎(chǔ)玻璃的核化與晶化制度。采用XRD、FTIR和SEM等方法研究NCS系微晶玻璃的結(jié)晶性能、組織結(jié)構(gòu)和透明性 能。結(jié)果表明：NCS系玻璃經(jīng)熱處理后析出成分接近于Na6Ca3Si6O18的微晶體。當(dāng)玻璃在(630 ℃，10 h)+(800 ℃，1 h)條件下處理時(shí)，結(jié)晶度達(dá)79.86%，晶粒為球形，尺寸為1~2 μm，3 mm厚試樣在710 nm波長下的透光率為68.8%；繼續(xù)延長熱處理時(shí)間, 晶相和玻璃相的化學(xué)組成連續(xù)變化，玻璃幾乎完全析晶，晶粒尺寸達(dá)250 μm，3 mm厚試樣在710 nm波長下的透光率達(dá)65.5%。
關(guān)鍵字: 微晶玻璃；鈉鈣硅酸鹽；析晶；微觀結(jié)構(gòu)
（School of Materials Science and Engineering, Central South University, Changsha 410083, China）
Abstract:The transparent Nd2O3 doped Na2O-CaO-SiO2(NCS) glass-ceramics with high crystallinity were prepared. The nucleation and crystallization conditions of precursor glass were determined by DSC. The crystal phase, crystallite size, morphology and transparency were examined by XRD, IR, SEM and UV-VIS. The results show that the compositions of crystals are close to Na6Ca3Si6O18 when NCS glass is heat-treated under different conditions. When the NCS glass is heat-treated at (630 ℃, 10 h)+(800 ℃, 1 h), the spherical crystals with grain size of about 1−2 μm are obtained, the crystallinity and the transmittance of 3 mm thick sample reach up to 79.86% and 68.8% at λ=710 nm, respectively. By prolonging the thermal treatment time, the crystallization is almost complete with grain size about 250 μm, and the transmittance of 3 mm thick sample still remains 65.5% at λ=710 nm.
Key words: glass-ceramics; sodium calcium silicate; crystallization; microstructure
