Near-net-shaped calcium hydroxyapatite by the oxidation of machinable, calcium-bearing precursors (the volume identical metal oxidation, or VIMOX, process)

Authors
Saw, E Sandhage, KH Gallagher, PK Litsky, AS
Citation
E. Saw et al., Near-net-shaped calcium hydroxyapatite by the oxidation of machinable, calcium-bearing precursors (the volume identical metal oxidation, or VIMOX, process), J AM CERAM, 83(4), 2000, pp. 998-1000
Citations number
15
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
ISSN journal
00027820 → ACNP
Volume
83
Issue
4
Year of publication
2000
Pages
998 - 1000
Database
ISI
SICI code
0002-7820(200004)83:4<998:NCHBTO>2.0.ZU;2-L
Abstract
A novel VIMOX (volume identical metal oxidation) route to near-net-shaped c alcium hydroxyapatite, Ca-10(PO4)(6)(OH)(2), is demonstrated: the oxidation of machinable Ca-Ca2P2O7 precursors. Mechanically alloyed mixtures of Ca a nd beta-Ca2P2O7 were compacted into disk- and bar-shaped preforms. The latt er preforms could be machined into cylinders using a metalworking lathe (20 0 rpm, hardened steel tooling). After oxidation at 600 degrees C in O-2, an d then postoxidation annealing in H2O/O-2 mixtures at 850 degrees C and 115 0 degrees C, phase-pure hydroxyapatite was obtained. Because of offsetting volume changes from calcium oxidation and hydroxyapatite formation, porous hydroxyapatite bodies were produced that retained the shapes and dimensions (within 1%) of the machined precursors.