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Preparation of Fibrous, Porous Hydroxyapatite Ceramics from Hydroxyapatite Whiskers
Author(s) -
Suchanek Wojciech L.,
Yoshimura Masahiro
Publication year - 1998
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.1151-2916.1998.tb02408.x
Subject(s) - whiskers , materials science , whisker , microstructure , sintering , composite material , porosity , hot pressing , ceramic , fabrication , medicine , alternative medicine , pathology
Hydroxyapatite (HAp) whiskers have been used to prepare fibrous, porous HAp ceramics. The fibrous microstructure was retained in all cases after hot‐pressing the HAp whiskers at 800‐900°C (1 h, 30 MPa). The fracture path in the fibrous, porous HAp ceramics was partially intergranular, indicating the occurrence of crack deflection, bridging, and pull‐out effects. When the whiskers were hot‐pressed at 1000‐1100°C (1 h, 30 MPa), only large equiaxed grains were present in the HAp ceramics; thus no toughening occurred. When nonstoichiometric HAp whiskers were used to fabricate a porous body, β‐TCP precipitated on the whisker surface without destroying the fibrous microstructure. Sintering the HAp whiskers is thus an easy way for in situ fabrication of HAp/β‐TCP fibrous, porous materials with a controlled biodegradation rate.