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Influence of Processing Conditions on the Microstructure and Mechanical Properties of Sintered Yttrium Oxides
Author(s) -
DesmaisonBrut M.,
Montintin J.,
Valin F.,
Boncoeur M.
Publication year - 1995
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.1151-2916.1995.tb08238.x
Subject(s) - materials science , yttrium , microstructure , flexural strength , hot isostatic pressing , crystallite , ceramic , oxide , composite material , sintering , grain size , thermal shock , indentation hardness , fracture toughness , hot pressing , metallurgy
High‐purity (99.9%) yttrium oxide (Y 2 O 3 ) powder has been consolidated, either by vacuum sintering (VS) or by hot isostatic pressing (HIP). As the dense polycrystalline ceramics contained point defects, mainly oxygen vacancies, oxidation treatment was applied at 1500°C for 2 h. The two materials were compared with respect to mechanical, elastic, and thermal properties, and this work demonstrated that the HIPed oxide had the best performance. The beneficial effect of the HIP technique was mainly due to the achievement of a slightly higher densiflcation at a much lower applied temperature. This technique prevented any grain coarsening and allowed us to obtain a more homogeneous structure. Consequently, improvements in microhardness, flexural strength, and thermal shock parameters were significant. Nevertheless, the elastic parameters and the toughness values of the two grades were very close to each other.