Structural characterisation of apatite coatings

The current, most frequently employed, commercial route to produce hydroxyapatite prosthetic coatings is plasma spraying. However, this has several important limitations especially for textured surfaces. Low temperature methods of coating fabrication such as cathodic electrodeposition are attractive...

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Bibliographic Details
Published in:Journal of materials science 2004-09, Vol.39 (18), p.5747-5754
Main Authors: ROGERS, K. D, ETOK, S. E, SCOTT, R
Format: Article
Language:English
Subjects:
Apatite
Biological and medical sciences
Cathodic coating (process)
Coated electrodes
Coatings
Condensed matter: structure, mechanical and thermal properties
Crystallites
Exact sciences and technology
Hydroxyapatite
Materials science
Medical sciences
Microstrain
Phase composition
Physics
Plasma
Plasma spraying
Preferred orientation
Prostheses
Radiotherapy. Instrumental treatment. Physiotherapy. Reeducation. Rehabilitation, orthophony, crenotherapy. Diet therapy and various other treatments (general aspects)
Sprayed coatings
Structure and morphology
thickness
Substrates
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
Technology. Biomaterials. Equipments. Material. Instrumentation
Thin film structure and morphology
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Summary:The current, most frequently employed, commercial route to produce hydroxyapatite prosthetic coatings is plasma spraying. However, this has several important limitations especially for textured surfaces. Low temperature methods of coating fabrication such as cathodic electrodeposition are attractive alternatives. However, quantitative characterisation of the phase composition of thin electrodeposited coatings can be problematic. An X-ray diffraction method, which provides quantitative compositional information without reference to external or internal standards, is introduced and validated. The method can also be applied when Bragg peaks from the supporting substrate are apparent within the data and preferred orientation can be tolerated. This method has been used to examine in detail the microstructure of electrodeposited coatings which are compared directly with those formed by a commercial plasma spraying process.We show that, unlike the plasma sprayed coatings, the electrodeposited material consists of a single crystalline phase (hydroxyapatite) and a significantly reduced amorphous phase. The electrodeposited coatings also possess significantly more microstrain and a smaller crystallite size than the corresponding plasma sprayed material.
ISSN:0022-2461
1573-4803
DOI:10.1023/B:JMSC.0000040085.43633.8a