期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 40, 期 6, 页码 2417-2425出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2020.02.012
关键词
Magnesium aluminate spinel; Spark plasma sintering; Carbon contamination; Optical properties
资金
- European Union's Horizon 2020 research and innovation programme [739566]
- Czech Ministry of Education [LTT18013]
- [SAS MOST JRP 2015/6]
- [VEGA 2/0026/17]
The discolouration of magnesium aluminate spinet caused by carbon contamination is a main drawback of fabricating transparent bodies by spark plasma sintering (SPS). In this study, a two-stage heating rate profile was used to produce transparent MgAl2O4 without using sintering aids by SPS at 1250 degrees C. The effect of critical temperature (Tc), at which the heating rate is decreased, on transparency and carbon contamination was investigated: higher critical temperature resulted in higher contamination. Non-uniform densification indicated that fast heating results in a hot-zone formation in the centre of sintered pellets; the higher temperature of centre favoured reaction of graphite die with spinel and formation of disordered carbon structures in residual pores.
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