Preparation and Thermal Expansion Behavior of Excess SiO2 Pollucite Powders
Preparation and Thermal Expansion Behavior of Excess SiO2 Pollucite Powders
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过量SiO2铯榴石粉体的制备及其热膨胀行为
DOI：
10.2109/jcersj.100.91
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发表时间：
1992
期刊：
影响因子：
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通讯作者：
T. Mitamura
中科院分区：
文献类型：
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作者：
Hidehiko Kobayashi;T. Terasaki;T. Mori;H. Yamamura;T. Mitamura
以CsNO_3、Al_2O_3溶胶和SiO_2溶胶为原料，采用溶胶凝胶法制备了含过量SiO_2的单相偏光石粉。还研究了这些粉末的热膨胀行为。通过对Cs2O：SiO_2：Al_2O_3(摩尔比)为1：4.5-5：1的偏光石粉的合成研究，结果表明：采用溶胶凝胶法制备的干燥样品在600℃下加热24小时，然后在750℃下加热10h，然后在1000℃下焙烧50h，效果最好。合成的含有过量SiO_2的单相闪锌矿粉末在室温至200℃的温度范围内表现出较低的热膨胀，并且热膨胀小于0.1%的温度范围扩展到600℃。
Pollucite powders of single phase containing excess SiO2 have been prepared from CsNO3, Al2O3 sol and SiO2 sol by a sol-gel processing. Behaviors of the thermal expansion of these powders have been also studied. As a result of the research for synthesis of the pollucite powders (Cs2O:SiO2:Al2O3 (molar ratio)=1:4.5-5:1), the two-stage heat treatment was the most effective: after the dried samples prepared by the solgel process were heated at 600°C for 24h and were subsequently heated at 750°C for 10h, then the powders were calcined at 1000°C for 50h. The synthesized pollucite powders of single phase containing excess SiO2 showed a low thermal expansion from room temperature to 200°C. Furthermore, it is revealed that the range of temperature showing the thermal expansion less than 0.1% was extended up to 600°C.