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Effect of Forming Pressure on the Internal Structure of Alumina Green Bodies Examined with Immersion Liquid Technique
Author(s) -
Uematsu Keizo,
Miyashita Masayori,
Kim JinYoung,
Kato Zenji,
Uchida Nozomu
Publication year - 1991
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.1151-2916.1991.tb08278.x
Subject(s) - compaction , materials science , intergranular corrosion , optical microscope , immersion (mathematics) , composite material , relative density , mineralogy , scanning electron microscope , chemistry , microstructure , geometry , mathematics
Green bodies prepared by compaction of alumina granules were made transparent by an immersion liquid technique, and the internal structure was characterized with an optical microscope to study the effect of forming pressure on the internal structure. Clear images obtained by the technique provide more detailed information than other existing methods for structures ranging from one to tens of micrometers. Intergranular pores were present between unfractured granules. Their sizes and concentration tended to decrease with increasing forming pressure. However, pores were clearly present even in the green body prepared at 600 MPa. A rod‐ and needlelike feature was also found and was concluded to correspond to a high‐density region. The significance of large pores and high‐density regions on processing as well as the details of the technique is discussed.