Zirconia nano-powder - a useful precursor to dense polycrystals

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• 作者：Radosław Lach ; Kamil Wojciechowski ; Dariusz Zientara ; Krzysztof Haberko ; Paweł Rutkowski ; Mirosław M. Bućko ; ^{bucko@agh.edu.pl}
• 关键词：A. Sintering ; B ; Microstructure-final ; D. ZrO2
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：1 April 2017
• 年：2017
• 卷：43
• 期：5
• 页码：4470-4474
• 全文大小：1551 K
• 卷排序：43

文摘

The main problem of utilization of ceramic nanopowders consists in their tendency to form hard agglomerates. The inter-agglomerate space forms pores surrounded by numerous elementary particles (crystallites). Such pores cannot be easily removed from the system during pressureless sintering. So, the obvious strategy for a technologist is to eliminate such pores at the level of shaping operations. Dry pressing is a frequently applied shaping technique of ceramic materials. That is why mechanical strength of agglomerates should be as low as possible. It enables the elimination of inter-agglomerate pores to occur under moderate pressures, applied during the shaping process. This problem will be illustrated using the really nanometric (below 10 nm) zirconia-yttria solid solution powder. The methods of effecting agglomerate strength will be shown. One of the elaborated powder preparation rout results in extremely soft agglomerates.