期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 43, 期 8, 页码 3544-3552出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2023.01.059
关键词
Spark plasma sintering; MgO spinel; Optical properties
The effects of LiOH doping and different SPS schedules on densification behavior and final transparency of polycrystalline magnesium aluminate spinel were investigated. Slow heating rate was optimal for undoped spinel with the highest transmittance, while fast heating rate was beneficial for LiOH-doped spinel with reduced carbon contamination.
The effects of LiOH doping of magnesium aluminate spinel powders and various Spark Plasma Sintering (SPS) schedules on densification behavior and final transparency of polycrystalline magnesium aluminate spinel were studied. Two commercial magnesium aluminate spinel powders, with different specific surface areas, were doped with up to 0.6 wt% of LiOH and consolidated using SPS with slow (2.75 degrees C/min) and fast (100 degrees C/min) heating rates. The slow heating rate was optimal for undoped magnesium aluminate spinel (LiOH-free) with the best real in-line transmittance (RIT) of 84.8% (measured at 633 nm on a disc 0.8 mm thick). For the magnesium aluminate spinel doped with 0.3 wt% of LiOH, the fast heating rate was beneficial, and an RIT of 76.5% was achieved. mu-Raman analysis confirmed that the addition of LiOH suppressed carbon contamination.
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