ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Plasma spray deposition of hydroxyapatite (HA) coatings is a well established commercialprocess. When deposited on metallic substrates, these coatings have been shown to promote bonefixation and osteconductivity. A concern with current coatings is the formation of relatively largedebris particles during resorption. The size of the debris is related to the particle size of the powderinjected into the plasma during the deposition process. The use of solution precursors or dispersionsof fine particle size powders as the feedstock for plasma spraying has been shown to producesubmicron/nanocrystalline structured coatings from relatively inexpensive precursors.Nanocrystalline HA coatings may improve the resorption of the coating in the body, avoiding theirritant effect of large particles which may be seen in current thermal sprayed HA coatings.We have explored the use of sols prepared from several different precursors as the feedstock for theplasma spray deposition of HA coatings on Ti6Al4V substrates, employing statistical design ofexperiments to establish optimal deposition conditions. We report on the formation and thecharacteristics of the coatings as a function of the deposition parameters. The presence of differentCa-P crystalline and amorphous phases was assessed by X-ray diffraction analysis. The coatingmicrostructure was characterized by scanning/transmission electron microscopy. The suitability ofthe technique to coat biomedical implants is discussed
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.1128.pdf
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