欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
采用燃烧法在较低温度下成功合成了各向同性的负热膨胀材料ZrW2O8粉体.用X射线衍射、扫描电镜、红外光谱综合分析和研究了反应过程中炉温、硼酸和尿素含量、W6＋与Zr4＋的摩尔比对合成ZrW2O8纯度的影响.结果表明：燃烧法可以合成高纯度、粒径为0.5μm的ZrW2O8粉体.燃烧法合成高纯ZrW2O8的最佳条件是：炉温为500℃,硼酸的摩尔分数为10%,（NH2）2CO与（NH4）5H5[H2（WO4）6]·H2O＋ZrOCl2·8H2O的质量比为2∶1,（NH4）5H5[H2（WO4）6]·H2O与ZrOCl2·8H2O的摩尔比为1∶3.2.所合成的ZrW2O8在50～700℃之间的线膨胀系数a=-5.08×10-6/℃,其线膨胀系数与温度的关系符合方程dL/L0=-1.4×10-2-4.5×10-4T（50℃≤T≤700℃）.
英文摘要：
Isotropic ZrW2O8 powders material with negative thermal expansion were successfully synthesized via combustion method at low temperature. The effects of the furnace temperature, the H3BO3 and （NH2）2CO content, and the molar ratio of W^6＋ and Zr^4＋ on the purity of the synthesized ZrW2O8 powders were investigated by X-ray diffraction, scanning electron microscopy and infrared spectrum. The results show that high purity ZrW2O8 powders with a mean particle size of 0.5μm, can be obtained by the method under the following conditions： a furnace temperature of 500℃; a H3BO3 molar fraction of 10%; a 2：1 mass ratio of （NH2）2CO and （NH4）sHs[H2（WOn）6]·H2O added to ZrOCl2·8H2O; and a 1：3.2 molar ratio of （NHn）5H5[H2（WOn）6]·H2O and ZrOCl2·8H2O. The linear thermal expansion coefficient of prepared ZrW2O8 material is -5.08×10^-6/℃ in the temperature range from 50℃ to 700℃. The equation for the relationship of thermal expansion to the temperature of the material is dL/L0=-1.4×10^-2-4.5×10^-4T .
同期刊论文项目
同项目期刊论文
期刊信息
位置：