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Highly transparent Mg 0.27 Al 2.58 O 3.73 N 0.27 ceramic fabricated by aqueous gelcasting, pressureless sintering, and post‐HIP
Author(s) -
Zong Xiao,
Wang Hao,
Gu Honggang,
Ren Lu,
Guo Shengqiang,
Tu Bingtian,
Wang Weimin,
Liu Shiyuan,
Fu Zhengyi
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16544
Subject(s) - materials science , ceramic , hot isostatic pressing , sintering , spinel , transparent ceramics , slurry , aqueous solution , composite material , fourier transform infrared spectroscopy , infrared , mineralogy , metallurgy , chemical engineering , optics , chemistry , physics , engineering
Magnesium aluminum oxynitride (Mg 0.27 Al 2.58 O 3.73 N 0.27 , termed as MgAlON) ceramics with high transparency and complicated shape was prepared by aqueous gelcasting, pressureless sintering, and followed by hot isostatic pressing. No obvious hydration was found by the characterizations of X‐ray diffraction, pH value, Fourier transform infrared and thermal analysis for the interaction between MgAlON spinel powders and water, leading to the stable MgAlON slurry with high solid loading (52 vol%) and low viscosity. This result may be due to different composition of MgAlON from that of MgAl 2 O 4 and AlON. Besides, transparent MgAlON ceramic (1.95 mm in thickness) with a high in‐line transmittance ~86.3% at 3.7 μm was fabricated. The refractive index ~1.7499 at 589.3 nm and absorption coefficient ~1.2 cm −1 at 5 μm of MgAlON are between those of AlON and MgAl 2 O 4 transparent ceramics, and Abbé number ~73.66 of MgAlON is the highest.