Distribution of carbon contamination in MgAl2O4 spinel occurring during spark-plasma-sintering (SPS) processing: I Effect of heating rate and post annealing

被引:45
作者
Morita, Koji [1 ]
Kim, Byung-Nam [1 ]
Yoshida, Hidehiro [1 ]
Hiraga, Keijiro [1 ]
Sakka, Yoshio [1 ]
机构
[1] Natl Inst Mat Sci, 1-2-1 Sengen, Tsukuba, Ibaraki 3050047, Japan
关键词
Spark-Plasma-Sintering; Carbon; Optical properties; Spinel; RAMAN-SPECTRA; TRANSPARENT; PRESSURE; DISCOLORATION; CONSOLIDATION; HYDROTALCITE; TEMPERATURE; FABRICATION; CO;
D O I
10.1016/j.jeurceramsoc.2017.09.038
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
Carbon contamination from the carbon paper/dies during spark-plasma-sintering (SPS) processing was examined in the MgAl2O4 spinel. The carbon contamination sensitively changes with the heating rate during the SPS processing. At the high heating rate of 100 degrees C/min, the carbon contamination having organized structures occurred over almost the entire area from the surface to deep inside the SPSed spinel disk. In contrast, at the slow heating rate of 10 degrees C/min, the carbon contamination having disordefed structures occurred only around the surface area. The carbon phases transform into high pressure CO/CO2 gases by post-annealing in air and lead to pore formation along the grain junctions. The pore formation significantly occurs at the high heating rate due to the large amount of the contaminant carbon phases. This suggests that if once the carbon contamination was formed in the materials, it is very difficult to remove the carbon phases from the materials.
引用
收藏
页码:2588 / 2595
页数:8
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