Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 38, Issue 11, Pages 4057-4063Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2018.04.057
Keywords
MgO center dot 1.8Al(2)O(3)anti-hydrolysis; Gel-casting; PS/HIP; Transparent ceramic
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Funding
- National Key R&D Program of China [2017YFB0310500]
- National Natural Science Foundation of China [51472195, 51502219, 51727809]
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Non-stoichiometric MgO center dot 1.8Al(2)O(3) spinel transparent ceramic was prepared from synthesized single phase powder through an aqueous gel-casting forming technique. In order to prevent hydrolysis, the powder was specially treated in toluene with stearic acid and then dispersed in an aqueous solution with the help of amphoteric compound Tween 80 and dispersant TMAH. The surface modification process was confirmed by various techniques such as Fourier transmission infrared absorption spectroscopy (FT-IR), pH value, zeta potentials and rheological properties. Afterwards, gel-casted green compacts were debinded, pressureless-sintered (PS) and hotisostatic-pressed (HIP). Highly transparent MgO center dot 1.8Al(2)O(3) ceramics (3.6 mm in thickness) with in-line transmittance values of 77-82 % in visible region and higher than 85% in near infrared region were obtained. The samples exhibited Knoop hardness of 12.2 +/- 0.2 GPa, Young's modulus of 302 GPa, refractive index of 1.7046, and Abbe's number of 75.8.
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