Preparation of Hollow ZrB_2 Spheres by a Combined Sol-gel and Boro/carbothermal Reduction Method  

作　　者：CAO Yingnan ZHANG Haijun ZHANG Shaowei 

机构地区：[1]State Key Laboratory of Advanced Refractories,Sinosteel Luoyang Institute of Refractories Research Co.,Ltd. [2]The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology

出　　处：《China's Refractories》2017年第3期43-48,共6页中国耐火材料（英文版）

基　　金：financially supported by National Natural Science Foundation of China(General program,51272188,51472184,51472185);State Basic Research Development Program of China(973 Program,2014CB660802);Natural Science Foundation of Hubei Province,China(Contract No.2013CFA086);Foreign cooperation projects in Science and Technology of Hubei Province,China(Contract No.2013BHE002)

摘　　要：Carbon microspheres were firstly prepared using glucose （C6H12O6 ） as the starting materials by hydrotherreal carbonization. Then hollow ZrB2 spheres were successfully synthesized using zirconium oxychloride （ ZrClO2 · 8H2O）, boric acid （ H3BO3 ） by a combined solgel and boro/carbothermal reduction method, and the prepared carbon microspheres as the template. The effects of the reaction temperatures （1 200, 1 300, 1 400 and 1 500 ℃, respectively） and contents of carbon microspheres （ n （ C ） ： n （ ZrO2 ＋ B2O3） is 5. 0, 5. 5, 6. 0 and 6. 5, respectively） on the synthesis of hollow ZrB2 spheres were studied. The prepared carbon microspheres have smooth sugrace and good hollow structure by hydrothermal nitridation. Increase of reaction temperature and excessive carbon microspheres can greatly promote the formation of hollow ZrB2 spheres. The optimized reaction temperature and molar ratio of n （C）/ n （ ZrO2 ＋ B2O3 ） were 1 500 ℃ and 6.5, respectively.Carbon microspheres were firstly prepared using glucose （C6H12O6 ） as the starting materials by hydrotherreal carbonization. Then hollow ZrB2 spheres were successfully synthesized using zirconium oxychloride （ ZrClO2 · 8H2O）, boric acid （ H3BO3 ） by a combined solgel and boro/carbothermal reduction method, and the prepared carbon microspheres as the template. The effects of the reaction temperatures （1 200, 1 300, 1 400 and 1 500 ℃, respectively） and contents of carbon microspheres （ n （ C ） ： n （ ZrO2 ＋ B2O3） is 5. 0, 5. 5, 6. 0 and 6. 5, respectively） on the synthesis of hollow ZrB2 spheres were studied. The prepared carbon microspheres have smooth sugrace and good hollow structure by hydrothermal nitridation. Increase of reaction temperature and excessive carbon microspheres can greatly promote the formation of hollow ZrB2 spheres. The optimized reaction temperature and molar ratio of n （C）/ n （ ZrO2 ＋ B2O3 ） were 1 500 ℃ and 6.5, respectively.

关 键 词：zirconium diboride boro/carbothermal sol - gel TEMPLATE hollow spheres 

分 类 号：TQ134.12[化学工程—无机化工]