无机材料学报Issue(7)：717-721,5.DOI:10.3724/SP.J.1077.2014.13564
凝胶陈化对ZrB2粉末制备的影响
Effects of Gel Aging on Synthesis of ZrB2 Powders
摘要
Abstract
ZrB2 particles were synthesized by a Sol-Gel method using zirconium n-propoxide, boric acid, acetic acid and D-fructose. D-Fructose acts as both a modifier and a carbon source for carbothermal reduction reaction. For com-parison, both nascent state gel and aged gel were used to clarify the aging-time-dependent mechanism for ZrB2 synthe-sis. As a result, a single phase ZrB2 powder with a uniform size and shape distribution can be obtained from the aged gel with a boron and carbon to zirconium molar ratio of 3.5-4 and 7, respectively, after reduced at 1550 ℃ for 2 h. Besides, the synthesized ZrB2 particles exhibit prism-like morphology with average particle size of ca. 4-7 μm in length, 1 μm in diameter of excircle of the cross-section and 4-7 in aspect ratio, when initial raw materials ratio n(B)/n(Zr) is 3.5-4 and n(C)/n(Zr) is 7. The median diameter D50 is 6.46μm and specific surface area is about 2.53 m2/g. Furthermore, a complete carbothermal reduction of ZrO2 can be achieved using the aged gel.关键词
陈化/溶胶-凝胶/合成/ZrB2Key words
aging/Sol-Gel/synthesis/ZrB2分类
化学化工引用本文复制引用
杨碧云,李军平,汪庭语,李锐星,冯志海,才鸿年..凝胶陈化对ZrB2粉末制备的影响[J].无机材料学报,2014,(7):717-721,5.基金项目
国家自然科学基金(51372006) （51372006）
国家人力资源和社会保障部2010年度高层次留学人才回国工作资助(人社厅函2010, No.411) National Natural Science Foundation of China (51372006) （人社厅函2010, No.411）
Scientific Research Starting Foundation for Returned Overseas Chinese Scholars, Ministry of Education, Start-Up Fund for High-End Returned Overseas Talents (Renshet-inghan 2010, No.411) （Renshet-inghan 2010, No.411）
