SiO2和GeO2添加剂对四方氧化锆纳米粉体烧结动力学的影响

2018 IEEE 8th International Conference Nanomaterials: Application & Properties (NAP) Pub Date : 2018-09-01 DOI:10.1109/NAP.2018.8915192

M. Lakusta, I. Danilenko, G. Volkova, L. Loladze, T. Konstantinova

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引用次数: 0

摘要

研究了少量SiO2、GeO2添加剂对四方氧化锆纳米粉(3Y-TZP)初始烧结阶段动力学的影响。结果表明，添加剂对氧化锆纳米粉体初始烧结阶段的相组成、晶粒大小、团聚度及烧结机理有显著影响。采用非等温收缩实验和恒热分析(CRH)方法，研究了3Y-TZP (ZrO2-3 mol%Y2O3)在添加和不添加少量1 wt % SiO2、GeO2添加剂的情况下的烧结性能。发现了添加剂对3Y-TZP中扩散机制的不同影响。添加1 wt% SiO2后，主要烧结机制由体积扩散机制转变为晶界扩散机制，并伴有活化能升高。当添加GeO2时，由于活化能降低，烧结过程明显加快。

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The SiO2 and GeO2 Additives Impact on the Sintering Kinetics of Tetragonal Zirconia Nanopowders

The impact of a small amount SiO2, GeO2 additives on the kinetics of the initial sintering stage of tetragonal zirconia nanopowders (3Y-TZP) has been investigated. It was shown a significant influence of additives on phase composition, crystallite size, agglomeration degree and the sintering mechanisms of the initial sintering stage of zirconia nanopowders. The sintering behavior of 3Y-TZP (ZrO2-3 mol%Y2O3) with and without a small amount of 1 wt % of SiO2, GeO2 additives using the dilatometric data obtained from the non-isothermal shrinkage measurements and analytical constant rate of heating (CRH) method was investigated. It was found the different influence of additives on the diffusion mechanisms in 3Y-TZP. Predominant sintering mechanism was changed by addition 1 wt% SiO2 from volume diffusion mechanism to the grain boundary diffusion mechanism that accompanied by activation energy increasing. In case of GeO2 addition the sintering process was significantly accelerated due to the activation energy reducing.

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2018 IEEE 8th International Conference Nanomaterials: Application & Properties (NAP)

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