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Preparation of Zirconia‐Toughened Bioactive Glass‐Ceramic Composite by Sinter–Hot Isostatic Pressing
Author(s) -
Kasuga Toshihiro,
Nakajima Kiichi,
Uno Tomoko,
Yoshida Masahiro
Publication year - 1992
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.1151-2916.1992.tb05545.x
Subject(s) - hot isostatic pressing , materials science , cubic zirconia , ceramic , fracture toughness , composite material , composite number , flexural strength , bioceramic , sintering , metallurgy
High‐strength bioactive ceramics, MgO‐CaO‐SiO 2 ‐P 2 O 5 glass‐ceramic composites toughened by zirconia, were prepared by sinter‐hot isostatic pressing (sinter‐HIPing) to achieve easier mass production and higher reliability. Raw materials for preparing a dense presintered body were investigated to obtain almost complete densification by sinter‐HIPing. It was found that the densification of a presintered body was influenced by residual glassy phases in the crystallized glass particles. By using a controlled crystallized glass powder and a zirconia powder as raw materials, a presintered body with a relative density higher than 94% was prepared, and then it was densified to near its theoretical density by sinter‐HIPing. This bioceramic exhibited an extremely high bending strength of 400 to 1000 MPa and fracture toughness of 3 to 5 MPa.m 1/2 for 30 to 80 vol% of zirconia.