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Highly Transparent Alumina Spark Plasma Sintered from Common‐Grade Commercial Powder: The Effect of Powder Treatment
Author(s) -
Jin Xihai,
Gao Lian,
Sun Jing
Publication year - 2010
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.1551-2916.2009.03544.x
Subject(s) - materials science , spark plasma sintering , microstructure , sintering , hydrofluoric acid , homogeneity (statistics) , ceramic , transparent ceramics , grain size , metallurgy , statistics , mathematics
Transparent alumina were tentatively prepared by spark plasma sintering, using aggregated submicrometer‐sized commercial Al 2 O 3 powder. It is found that the pretreatment of the powder in hydrofluoric acid significantly reduces the aggregate size of the powder, suppresses the grain growth, and improves the microstructure homogeneity of the sintered ceramics. The sample sintered from the pretreated powder is highly transparent, while the sample sintered from the untreated powder is translucent at most. The fundamental reasons for this are investigated.