Rapid synthesis of low thermal expansion materials of Cab>1鈭?span style='font-style: italic'>xb>Srb>xb>Zrb>4b>Pb>6b>Ob>24b>

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• 作者：D.Y. Xie ; Z.H. Wang ; X.S. Liu ; W.B. Song ; B.H. Yuan ; E.J. Liang ; ^{ejliang@zzu.edu.cn}
• 关键词：Ceramics sintering ; Low thermal expansion material ; Alkaline earth zirconium phosphate ; Density ; Raman spectroscopy ; DSC
• 刊名：Ceramics International
• 出版年：2012
• 期刊代码：13_02728842
• 类别：ms
• 出版时间：July, 2012
• 卷：38
• 期：5
• 页码：3807-3813
• 文件大小：1410 K

摘要

A rapid synthesis method is introduced for the synthesis of low thermal expansion materials of Cab>1鈭?em>xb>Srb>xb>Zrb>4b>Pb>6b>Ob>24b> (x = 0, 0.5 and 1) and optimum synthesizing conditions are obtained. It is shown that these materials can be synthesized by one-step sintering by putting the preheated mixture of CaCOb>3b>, SrCOb>3b> and NHb>4b>Hb>2b>POb>4b> directly into a pipe furnace at the sintering temperature (1673-1873 K). With this method, the sintering procedure is much simplified and sintering time and energy exhausts are considerably reduced with respect to the conventional solid state reactions which usually require multiple-step and longer time sintering at different temperatures with intermediate grindings for the synthesis of these materials. By putting the samples directly at the sintering temperature, the formation of the secondary phase ZrPb>2b>Ob>7b> can be largely avoided. This insures the rapid synthesis of Cab>1鈭?em>xb>Srb>xb>Zrb>4b>Pb>6b>Ob>24b>. MgO is introduced to increase the density of Cab>0.5b>Srb>0.5b>Zrb>4b>Pb>6b>Ob>24b> ceramics. A sintered density of 3.10 g cm^鈭?, relative density of 96.2%for Cab>0.5b>Srb>0.5b>Zrb>4b>Pb>6b>Ob>24b> is obtained with 1.0 wt.%MgO. The coefficients of thermal expansion are about 0.27 脳 10^鈭? K^鈭?. Raman spectroscopic and differential scanning calorimetry (DSC) analyses reveal that there are no phase transitions of all the samples from 113 K to 1423 K.