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摘 要:以硝酸鎂、硝酸鋁、硅酸為原料，尿素為燃料，用低溫燃燒法簡便快捷地合成堇青石前驅(qū)粉。在堇青石前驅(qū)粉中加入適量的粘結(jié)劑于170MPa下干壓成片,在不同溫度下燒結(jié)，獲得堇青石基玻璃陶瓷。 根據(jù)阿基米德原理，用排水法測量燒結(jié)體的密度，研究不同粒度的粉體對低溫燃燒合成堇青石粉燒結(jié)性能的影響；通過x-射線衍射分析樣品的物相，研究不同粒度的粉體對堇青石析晶性能的影響。結(jié)果表明： ?。?）以Mg(NO3)2·6H2O, Al(NO3)3·9H2O和H2SiO3為原料， CO(NH2)2為燃料可用低溫燃燒法制備堇青石基玻璃陶瓷。 ?。?）低溫燃燒法制備堇青石基玻璃陶瓷的析晶過程為：非晶態(tài) → μ-堇青石 → α-堇青石。 （3）用低溫燃燒法制備堇青石基玻璃陶瓷時，在同溫同壓的同等條件下，用粒度小的前驅(qū)粉比用粒度大的前驅(qū)粉更有利于α-堇青石晶相的獲得。 ?。?）同溫下燒結(jié)體的線收縮率隨粒度的增大而減小。 （5）不同種晶體密度不同，混晶物密度與各晶相含量相關(guān)。 關(guān)鍵詞：粒度；低溫燃燒；堇青石；析晶；燒結(jié)
ABSTRACT:The MgO-Al2O3-SiO2(MAS) glass powders have been synthesized by low-temperature combustion technique using magnesium nitrate, aluminium nitrate, silicic acid as material, urea as fuel. The crystallization process and sintering behavior were investigated. We can obtain cordierite based glass ceramics in the cordierite precursor powder with an appropriate amount of binder in the dry-pressed under 170MPa into a film, sintered at different temperatures. According to Archimedes, with a water density measurement of sintering, powders with different particle size of low-temperature combustion synthesis of cordierite powder sintering; Analyzing the effects of different size The powder on the properties of cordierite crystallization through the samples of X-ray diffraction phase . The results shows: (1) We can use the Mg (NO3) 2 • 6H2O, Al (NO3) 3 • 9H2O and H2SiO3 as raw materials, CO (NH2) 2 as the fuel temperature to combust Cordierite precursor powder. (2) The precipitation process of making cordierite-based glass ceramics under the low-temperature combustion is: chromatography amorphous → α-cordierite →μcordierite. (3) When prepared the cordierite-based glass ceramics with low-temperature combustion, the small size particle precursor powder is better than the large size precursor powder to get the alpha cordierite under same temperature and pressure condition. (4) Under the same temperature, line shrinkage rate of sintered body decreased with the increase of granularity. (5) Different kinds of crystals have different density; the density of mixed grain material is interrelated to the crystalline phase content. Key words: powder; low-temperature combustion synthesis; cordierite; crystallization; sintering; |
