A_2(WO_4)_3(A:Al,Y,Sc)粉体的制备及热膨胀性能

• 作 者: 李军 刘芹芹 杨娟 程晓农 朱君君
• 机 构: 江苏大学材料科学与工程学院,
• 出 处: 硅酸盐学报
• 发表日期: 2011年05期
• 关键词: 负热膨胀 钨酸盐 晶体结构 负热膨胀性 晶胞体积 晶胞参数 高温固相反应 热膨胀性 热膨胀性能 固相反应法

利用高温固相反应法制备A2W3O12(A:Al,Sc,Y,下同)负热膨胀材料,利用X射线衍射仪测定材料的晶体结构、晶胞参数及晶胞体积,结果表明:随A3+半径增大,A2W3O12的晶胞参数和晶胞体积增大。热膨胀系数测试结果表明:A2W3O12具有良好的负热膨胀性能,热膨胀系数绝对值随A3+半径增大而增大。以Sc2W3O12为复合相制备Si基Si/Sc2W3O12复合材料,Sc2W3O12的加入可有效降低复合材料热膨胀系数的绝对值。

A2W3O12 (A: Al, Sc, Y, the same below) negative thermal expansion material was prepared by high temperature solid-state reaction method. The crystal structure, unit cell parameters and unit cell volume were measured by X-ray diffractometer. Large, A2W3O12 unit cell parameters and unit cell volume increases. The test results of thermal expansion coefficient show that A2W3O12 has good negative thermal expansion and the absolute value of thermal expansion increases with the increase of A3 +. Sc2W3O12 composite phase preparation of Si-based Si / Sc2W3O12 composite materials, Sc2W3O12 addition can effectively reduce the absolute value of the thermal expansion coefficient of the composite material.