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X-ray Diffraction Characterization Of Crystallinity And Phase Composition In Plasma-sprayed Hydroxylapatite Coatings

From Lambda Technologies
 

 

Orthopedic and dental implants consisting of a metallic
substrate plasma-spray coated with hydroxylapatite
(HA) are currently used in reconstructive surgery. The
crystalline phases present in the calcium phosphate
ceramic and the degree of crystallinity must be
controlled for medical applications. X-ray diffraction
(XRD) is routinely employed to characterize the phase
composition and percent crystallinity in both biological
and sintered HA. However, application of the same
XRD methods to plasma-sprayed coatings is
complicated by the potential presence of several
crystalline contaminant phases and an amorphous
component.
To overcome the complexities of
characterizing plasma-sprayed HA coatings, an external
standard method of XRD quantitative analysis has been
developed that can be applied nondestructively. Data
collection and reduction strategies allowing separation
of intensity diffracted from commonly occurring phases
and the amorphous fraction are presented. The method
is applied to coating samples, and detection limits and
sources of error are discussed. Repeatability and
accuracy are demonstrated with powder mixtures of
known composition.

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Topics of Interest
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