Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第14卷    第11期    总第68期    2004年11月

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文章编号: 1004-0609(2004)11-1833-06
煅烧方式对草酸盐前驱体制备氧化锆性能的影响
刘继进1, 陈宗璋2

( 1. 中南大学 粉末冶金国家重点实验室, 长沙 410083;
2. 湖南大学 化学化工学院,长沙 410082
)

摘 要: 采用非线性加热法煅烧锆、 钇的草酸盐前驱体, 制备了8%Y2O3(摩尔分数)稳定ZrO2(8YSZ)超细粉末。 研究了金属离子与草酸的摩尔比及热处理方法对8YSZ的晶体结构、 晶粒大小、 形貌、 比表面积、 粒子团聚的影响。 通过改变不同温度范围的加热速度来优化草酸盐前驱体热分解工艺。 采用优化前驱体热分解工艺即非线性加热法, 于600~700 ℃煅烧得到的粉末为等轴晶形, 粒子大小在90~100 nm之间, 粒子间仅有较弱的软团聚。 煅烧过程晶粒生长动力学的研究表明: 当煅烧温度高于700 ℃时, 晶粒生长的质量传输受晶粒扩散过程控制; 低于700 ℃时, 晶粒生长的质量传输由表面扩散过程控制。

 

关键字: 钇稳定氧化锆; 非线性加热法; 草酸盐前驱体; 晶粒生长

Influence of calcination conditions on oxlate precursor-derived ultrafine 8% yttria-stabilized zirconia powders
LIU Ji-jin1, CHEN Zong-zhang2

1. State Key Laboratory for Powder Metallurgy, 
Central South University, Changsha 410083, China;
2. College of Chemistry and Chemical Engineering, 
Hunan University, Changsha 410082, China

Abstract: Ultrafine 8%(mole fraction) yttria-stabilized zirconia (8YSZ) powder was prepared by nonlinear heating of the oxalate precursor of yttrium and zirconium ions. The effects of molar ratio of metal ions to H2C2O4, and thermal decomposition of precursor on the crystal structure, specific surface area, grain size and morphology of 8YSZ powder were studied. The thermal decomposition process of the oxalate precursor was optimized through varying heating rate in different temperature ranges. The powders produced through optimized thermal decomposition process (nonlinear heating method at 600-700 ℃), were weakly aggregated and equiaxial, with a narrow particle size distribution of 90-100 nm. The kinetic for grain growth during calcination process was investigated. The results show that grain growth is controlled by grain boundary or lattice diffusion with higher activation energy (192.92 kJ/mol) when temperature is above 700 ℃, or controlled by surface diffusion with lower activation energy (87.38 kJ/mol) when temperature is below 700 ℃.

 

Key words: yttria-stabilized zirconia; nonlinear heating method; oxalate precursor; grain growth

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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