Kim, Dong-Suk Lee, Jong-Heun Sung, Rak Joo Kim, Sang Woo Kim, Hyung Soo Park, Jeong Shik 2024-01-21T01:30:56Z 2024-01-21T01:30:56Z 2021-09-05 2007-03 0955-2219 https://pubs.kist.re.kr/handle/201004/134580 Pure, 140, 500, and 2500 ppm MgO-doped Al2O3 specimens were sintered at 1700 degrees C in a vacuum with and without pre-sintering heat treatment (HT) at 800 degrees C for 50 h in air. Pre-sintering HT improved the transmittance in the visible (400-700 nm) range significantly. This enhanced transmittance was explained in terms of the removal of residual pores and the homogenization of the microstructure due to the lowering of the boundary mobility as a result of the MgO addition and the suppression of local densification through a pre-coarsening step. (c) 2007 Elsevier Ltd. All rights reserved. English ELSEVIER SCI LTD ABNORMAL GRAIN-GROWTH ALUMINA STRENGTH Improvement of translucency in Al2O3 ceramics by two-step sintering technique Article 10.1016/j.jeurceramsoc.2007.02.002 1 JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, v.27, no.13-15, pp.3629 - 3632 JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 27 13-15 3629 3632 scie scopus 000248822800010 2-s2.0-34347372287 Materials Science, Ceramics Materials Science Article; Proceedings Paper ABNORMAL GRAIN-GROWTH ALUMINA STRENGTH sintering optical properties Al2O3 lamp envelopes