期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 38, 期 15, 页码 5153-5159出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2018.07.024
关键词
Magnesium aluminate spinel (MgAl2O4); Transparent ceramic; Spark plasma sintering; Hot isostatic pressing
资金
- Israel Ministry of Defense [4440243997/634]
A two-stage processing approach combining spark plasma sintering (SPS) and hot isostatic pressing (HIP) was employed for the fabrication of relatively large (30 mm diameter) and thick (up to 8 mm) samples of transparent polycrystalline magriesium aluminate. The effects of sample thickness, heating rate during SPS, and the temperature and duration of HIP treatments were investigated. It was established that the heating rate during SPS had a major influence on discoloration due to carbon contamination, which increased with sample thickness. HIP treatment allowed for the elimination of cloudiness due to samples porosity, although carbon contamination present after the SPS step could not be reduced by HIP treatment, regardless of the temperature and duration applied. Highly transparent specimens with thicknesses of 4 and 8 mm exhibiting an in-line transmittance of 85.2 and 83.2% at 600 nm, respectively, were fabricated.
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