Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/41635

Title

Structural changes induced during thermal spraying of hydroxyapatite: a comparison of three different spraying methods

Author(s)

Knowles, Jonathan Campbell;  Gross, Karlis A.;  Berndt, Christopher C.;  Bonfield, William

Abstract

HA is commonly applied to orthopaedic implants by thermal spraying. The thermal spraying methods used induce differences, not only in the macroscopic and microscopic properties of the coating, but also at the atomic level, which may compromise the long term stability of the coating. Three different thermal spray methods were investigated to determine the effect each would have on the final coating produced at the atomic level. The methods investigated were flame spraying, plasma spraying and high velocity oxy-fuel spraying. All three methods induced a distortion into the hydroxyapatite structure. The high velocity method was expected to produce the highest distortion, but this was not seen due to an annealing effect. Changes were also seen on the chemical level and carbonate found in the precursor powders was removed as determined by both X-ray diffraction (XRD) and Fourier Transform Infra Red spectroscopy (FI'IR). Furthermore, hydroxyl groups were removed during spraying, to form oxyapatite.

Publication type

Conference paper

Source

Bioceramics: proceedings of the 8th International Symposium on Ceramics in Medicine, Ponte Vedra, Florida, United States, November 1995 / June Wilson, Larry L. Hench and David Greenspan (eds.), pp. 311-316

Publication year

1995

Keyword(s)

Biomaterials;  Biomedical materials;  Ceramics;  Ceramics biocompatibility;  Dental ceramics;  HA;  Medicine;  XRD;  X-ray diffraction

Publisher

Pergamon

ISBN

9780080426778, 0080426778

Peer reviewed