以ZrO2、硼酸、硅溶胶和炭黑为原料于1300~1700℃用碳热还原法合成了超细ZrBz/SiC复合陶瓷粉;用XRD和SEM等研究了合成温度、反应物配比等对复合粉体物相组成、微观形貌和粒径的影响。结果表明:当原料中硼酸过量(ZrO2与B2O3物质的量比为1:1.5)才能保证在1650℃下保温1h时碳热还原反应完全进行,得到高纯的ZrB2/SiC复合陶瓷粉体,其颗粒平均尺寸为0.4μm;不同温度制备的复合粉体颗粒形貌不同,随着温度的升高,晶须和棒状颗粒减少,而球形颗粒增多。
Ultra-fine ZrB2/SiC composite ceramic powders were synthesized at temperatures from 1 300 ℃ to 1 700 ℃ by carbothermal reduction using zirconium dioxide, boric acid, silica sol and carbon black as raw materials. The influences of synthesis temperature and reactant ratio on the phase composition, micro morphology and particle size of the composite powders were investigated by XRD and SEM. The results show that the completeness of carbothermal reduction for the synthesis of high purity ZrB2/SiC composite powders was needed of over dosage of boric acid (molar ratio of ZrO2 and B2O3 was 1 : 1. 5) when synthesized at 1 650 ℃ for 1 h. The composite powders had an average particle size of 0. 4μm, and different particle shapes after prepared at different temperatures. With the increase of synthesis temperature, the whisker and rod particles gradually reduced while ball particles increased.
参考文献
[1] | Sigrun N. Karlsdottir;John W. Halloran .Oxidation of ZrB_2-SiC: Influence of SiC Content on Solid and Liquid Oxide Phase Formation[J].Journal of the American Ceramic Society,2009(2):481-486. |
[2] | Sigrun N. Karlsdottir;John W. Halloran .Formation of Oxide Films on ZrB_2-15 vol percent SiC Composites During Oxidation: Evolution with Time and Temperature[J].Journal of the American Ceramic Society,2009(6):1328-1332. |
[3] | Carmen M. Carney;Pavel Mogilvesk;Triplicane A. Parthasarathy .Oxidation Behavior of Zirconium Diboride Silicon Carbide Produced by the Spark Plasma Sintering Method[J].Journal of the American Ceramic Society,2009(9):2046-2052. |
[4] | Takafumi Kusunose;Tohru Sekino;Yong Ho Choa;Koichi Niihara .Fabrication and microstructure of silicon nitride/boron nitride nanocomposites[J].Journal of the American Ceramic Society,2002(11):2678-2688. |
[5] | K. Niihara;T. Kusunose;S. Kohsaka .Multi -Functional Ceramic Composites through Nanocomposite Technology[J].Key engineering materials,1999(161/163):527-534. |
[6] | 江涛,金志浩,杨建锋,乔冠军.B4C/BN纳米复合粉末的制备与显微结构的研究[J].稀有金属材料与工程,2009(z1):280-283. |
[7] | Xiangdong Wang;Guanjun Qiao;Zhihao Jin .Fabrication of Machinable Silicon Carbide-Boron Nitride Ceramic Nanocomposites[J].Journal of the American Ceramic Society,2004(4):565-570. |
[8] | Yongjie Yan;Hui Zhang;Zhengren Huang .In Situ Synthesis of Ultrafine ZrB_2-SiC Composite Powders and the Pressureless Sintering Behaviors[J].Journal of the American Ceramic Society,2008(4):1372-1376. |
[9] | LIU Xiao-kui,LUO Fa,ZHU Dong-mei,ZHOU Wan-cheng.Microwave permittivity of SiC-Al2O3 composite powder prepared by sol-gel and carbothermal reduction[J].中国有色金属学会会刊(英文版),2006(z1):494-497. |
[10] | Yongjie Yan;Zhengren Huang;Shaoming Dong .New Route to Synthesize Ultra-Fine Zirconium Diboride Powders Using Inorganic-Organic Hybrid Precursors[J].Journal of the American Ceramic Society,2006(11):3585-3588. |
[11] | 傅仁利,于洪珍,张月铭,周和平.碳热还原法合成氮化铝的机理与热力学条件[J].中国矿业大学学报,2002(05):415-420. |
[12] | Wei-Ming Guo;Guo-Jun Zhang .Reaction Processes and Characterization of ZrB_2 Powder Prepared by Boro/Carbothermal Reduction of ZrO_2 in Vacuum[J].Journal of the American Ceramic Society,2009(1):264-267. |
[13] | 裘荣鹏,才庆魁,张宁.溶胶-凝胶工艺对SiC粉体形貌的影响[J].东北大学学报(自然科学版),2008(02):225-228. |
[14] | Hui Zhang;Yongjie Yan;Zhengren Huang .Properties of ZrB_2-SiC Ceramics by Pressureless Sintering[J].Journal of the American Ceramic Society,2009(7):1599-1602. |
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