纳米颗粒包覆ZrW_2O_8空心结构的制备和性能  

Preparation and Properties of ZrW_2O_8 Hollow Structures Coated with Colloidal Carbon Spheres

作　　者：张琳达[1] 王浩伟[1] 齐军 吴一[1] 彭思平 

机构地区：[1]上海交通大学特种材料研究所,上海200240 [2]上海紫竹新兴产业技术研究院,上海200240 [3]上海无线电设备研究所,上海200090

出　　处：《材料研究学报》2015年第10期773-778,共6页Chinese Journal of Materials Research

基　　金：航天科技创新基金USCAST2012-08;CASC201106资助项目~~

摘　　要：采用包覆法制备单一相钨酸锆(ZrW2O8)空心球。研究选择以水热合成法制备的胶体碳球作为制备空心球的模板,通过溶胶—凝胶法制备了具有网状结构的钨酸锆前驱体凝胶,经过后续简单的包覆过程得到胶体碳球—钨酸锆凝胶形成的壳核结构,并对该壳核结构进行煅烧(610℃保温10h)后除去碳球模板得到ZrW2O8空心球。实验所得ZrW2O8空心球平均粒径约3μm,球壳平均厚度为1.5μm,构成壳层结构的纳米级ZrW2O8颗粒为棒状无规则多面体,尺寸约500nm×50nm×50nm。FTIR和TG-DTA分析证明,产物为立方相ZrW2O8空心球,密度为2.8g/cm3,比理论值降低了45%;产物空心球具有良好的负热膨胀特性,在室温至200℃的温度区间内,负膨胀系数略低于理论值,平均热膨胀系数为-11.4×10-6K-1。Colloidal carbon microspheres were prepared from aqueous glucose solutions by hydro- thermal synthesis procedure, and then submicron core/shell structured precursors of carbon spheres/ ZrW2O88 were prepared by sol-gel method with colloidal carbon microspheres as templates to provide re- active surfaces for facilitating the deposition of nano-sized ZrW2O8particles. Finally, hollow spheres of ZrW2O8 can be produced by calcinating the precursors at 610℃ for 10h to remove the colloidal carbon sphere templates. The final spheres ZrW208 with an average size about 3pm were proved to be com- posed of single phase nano-sized ZrW2O8 particles. Their density was measured to be 2.8 g/cm3, ca 45% lower than that of ZrW2O8. Along with the density, FTIR and TG-DTA results also indicate the existence of hollow structure of the spheres ZrW2O8, of which the thermal expansion coefficient was-11.4× 10-6K-1 in the temperature range from room temperature to 200℃, a little higher than the theoretical value.

关 键 词：无机非金属材料 胶体碳球 纳米颗粒包覆 负膨胀 ZRW2O8 

分 类 号：TQ174[化学工程—陶瓷工业]