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Characteristics of Liquid Penetration into Undoped and Magnesia‐Doped Alumina
Author(s) -
Ahn Jung Hyuck,
Hong SeongHyeon,
Hwang gMoon,
Kim DohYeon
Publication year - 2003
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/j.1151-2916.2003.tb03633.x
Subject(s) - materials science , microstructure , impurity , penetration (warfare) , doping , homogenization (climate) , liquid phase , magnesium , composite material , mineralogy , metallurgy , chemistry , thermodynamics , biodiversity , ecology , physics , optoelectronics , organic chemistry , operations research , engineering , biology
Liquid‐forming impurities (CaO + SiO 2 ) were placed on the top of undoped and MgO‐doped Al 2 O 3 powder compacts, and the microstructural evolution and the extent of liquid penetration during heat treatment were investigated. Compared with the undoped specimen, abnormal grain growth was limited and the impurities penetrated more deeply in the MgO‐doped specimen. The homogenization of the microstructure and the enhanced liquid penetration in MgO‐doped specimens could be explained in terms of an interface roughening or a modification of the liquid‐(glass‐) phase characteristics, such as viscosity.