(ZrCa)_(x)Y_(2-2x)W_(3)O_(12)固溶体吸水性及热膨胀性能研究

Hygroscopicity and Thermal Expansion Properties of(ZrCa)_(x) Y_(2-2x) W_(3) O_(12) Solid Solution

采用固相烧结法制备出(ZrCa)_(x)Y_(2-2x)W_(3)O_(12)(x=0、0.1、0.2、0.3、0.4、0.5、0.6、0.7、0.8、0.9和1.0)固溶体,并利用XRD、拉曼光谱、热分析及热膨胀仪对材料的结构、吸水性及热膨胀性进行研究。结果表明,随着(ZrCa)^(6+)含量的增加,固溶体的吸水性明显降低,结晶水释放后,该系列固溶体的热膨胀系数呈规律性变化。当x=0.6时,(ZrCa)_(0.6)Y_(0.8)W_(3)O_(12)为近零膨胀,且其线性热膨胀系数a_l为2.79×10^(-7) K^(-1)(453~1 000 K)。

(ZrCa)_(x) Y_(2-2x) W_(3) O_(12)(x=0,0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9 and 1.0)are developed with a simple solid state method,and characterized for crystal structure,hygroscopicity and thermal expansion by X-ray diffraction,Raman spectroscopy,thermal analysis and dilatometer.The results show that the hygrosopicity of solid solution decreases obviously,and the coefficient of thermal expansion(CTE)changes regularly after complete release of the crystal water with the increase of(ZrCa)6+content.A near-zero thermal expansion(ZTE)is realized for(ZrCa)0.6 Y 0.8 W_(3) O_(12) as x=0.6,and the linear CTE(a l)is measured to be_(2).79×10^(-7) K^(-1)(453~1000 K).