Synthesis and characterization of porous hydroxyapatite and hydroxyapatite coatings

Conference · Wed Oct 25 04:00:00 EDT 2000

OSTI ID:15005278

Nieh, T G; Choi, B W; Jankowski, A F

A technique is developed to construct bulk hydroxyapatite (HAp) with different cellular structures. The technique involves the initial synthesis of nanocrystalline hydroxyapatite powder from an aqueous solution using water-soluble compounds and then followed by spray drying into agglomerated granules. The granules were further cold pressed and sintered into bulks at elevated temperatures. The sintering behavior of the HAp granules was characterized and compared with those previously reported. Resulting from the fact that the starting HAp powders were extremely fine, a relatively low activation energy for sintering was obtained. In the present study, both porous and dense structures were produced by varying powder morphology and sintering parameters. Porous structures consisting of open cells were constructed. Sintered structures were characterized using scanning electron microscopy and x-ray tomography. In the present paper, hydroxyapatite coatings produced by magnetron sputtering on silicon and titanium substrates will also be presented. The mechanical properties of the coatings were measured using nanoindentation techniques and microstructures examined using transmission electron microscopy.

• Research Organization: Lawrence Livermore National Lab., CA (US)
• Sponsoring Organization: US Department of Energy (US)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 15005278
• Report Number(s): UCRL-JC-141229
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACTIVATION ENERGY
AQUEOUS SOLUTIONS
COATINGS
MAGNETRONS
MECHANICAL PROPERTIES
SCANNING ELECTRON MICROSCOPY
SINTERING
SPRAY DRYING
SPUTTERING
SUBSTRATES
SYNTHESIS
TITANIUM
TOMOGRAPHY
TRANSMISSION ELECTRON MICROSCOPY