Effect of 1 wt% LiF additive on the densification of nanocrystalline Y2O3 ceramics by spark plasma sintering

被引：48
作者：
Marder, Rachel [1 ]
Chaim, Rachman [1 ]
Chevallier, Geoffroy [2 ]
Estournes, Claude [2 ]
机构：
[1] Technion Israel Inst Technol, Dept Mat Engn, IL-32000 Haifa, Israel
[2] CNRS, Inst Carnot Cirimat, F-31602 Toulouse 9, France
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2011年 / 31卷 / 06期
关键词：
Grain growth; Sintering; Grain size; Yttrium oxide; MGAL2O4; SPINEL; TRANSPARENT; MGO; PRESSURE; SPS; MICROSTRUCTURE; FABRICATION; MECHANISM; ALUMINA; YTTRIA;
D O I：
10.1016/j.jeurceramsoc.2010.12.032
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Densification of nanocrystalline cubic yttria (nc-Y2O3) powder, with 18 nm crystal size and 1 wt% LiF as a sintering additive was investigated. Specimens were fabricated by spark plasma sintering at 100 MPa, within the temperature range of 700-1500 degrees C. Sintering at 700 degrees C for 5 and 20 min resulted in 95% and 99.7% dense specimens, with an average grain size of 84 and 130 nm, respectively. nc-Y2O3 without additive was only 65% dense at 700 degrees C for 5 min. The presence of LiF at low sintering temperatures facilitated rapid densification by particle sliding and jamming release. Sintering at high temperatures resulted in segregation of LiF to the grain boundaries and its entrapment as globular phase within the fast growing Y2O3 grains. The sintering enhancement advantage of LiF was lost at high SPS temperatures. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1057 / 1066
页数：10
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