Low-temperature synthesis of ZrB2 nano-powders using a sorbitol modified sol-gel processing route
Low-temperature synthesis of ZrB2 nano-powders using a sorbitol modified sol-gel processing route
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DOI：
10.1016/j.apt.2014.01.005
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发表时间：
2014-05-01
影响因子：
5.2
通讯作者：
Sun, Xiaohong
中科院分区：
文献类型：
--
作者：
Ji, Huiming;Yang, Ming;Sun, Xiaohong
采用山梨醇改性溶胶-凝胶法，在较低温度下通过碳热还原反应合成了高纯二硼化锆纳米粉体。采用X射线衍射和透射电镜对ZrB 2纳米粉体的物相组成和形貌进行了表征。采用傅立叶变换红外光谱和热重/差热分析研究了山梨醇对溶胶-凝胶过程的影响及ZrB 2粉体的形成机理。山梨醇作为桥联和螯合配体，与H3 BO 3发生多羟基开环反应，生成螯合物，进而诱导ZrO 2缩合形成Zr-O-C-B网络，促进碳热还原反应在1450 ℃下进行1 h。合成的粉末呈现出近球形的形态，具有约100 nm的小的平均晶粒尺寸。相对于传统的固相法，山梨醇改性的溶胶-凝胶法路线保证了获得单相纳米粉末的更快、更容易和节能的过程。(C)2014年日本粉末技术学会。由Elsevier B. V.和日本粉末技术协会出版。All rights reserved.
High-purity zirconium diboride nano-powders were synthesized by carbothermal reduction reaction at a relatively low temperature from a novel sorbitol modified sol-gel method. Phase composition and morphology of the ZrB2 nano-powders were characterized by X-ray diffraction and transmission electron microscopy, respectively. The effect of sorbitol on sal-gel process and the formation mechanism of ZrB2 powders were investigated by fourier transform infrared spectroscopy and thermo gravimetric/differential thermal analysis. Sorbitol, used as bridging and chelating ligand, led to the formation of chelate complex through its polyhydroxy opening reaction with H3BO3, and then induced the condensation of zirconia forming Zr-O-C-B network, which promoted the carbothermal reduction reaction to complete at 1450 degrees C for 1 h. The synthesized powders exhibited near-spherical morphology with a small average crystalline size of about 100 nm. With respect to the conventional solid state method, the sorbitol modified sal-gel method route guaranteed a faster, easier and energy-saving process for obtaining single-phase nano-powders. (C) 2014 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.