ASTM F2024 - 10(2021)

Standard Practice for X-ray Diffraction Determination of Phase Content of Plasma-Sprayed Hydroxyapatite Coatings

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1.1 This practice is for the determination, by the Reference Intensity Ratio External Standard Method, of the percent by weight of the crystalline phases, hydroxyapatite (HA), beta-(whitlockite) tricalcium phosphate (ß-TCP), and calcium oxide (CaO) in coatings deposited upon metallic substrates by plasma spraying hydroxyapatite.1.2 A major component in plasma-sprayed HA coatings other than HA is expected to be amorphous calcium phosphate (ACP). Crystalline components other than HA that may be present include alpha- and beta- (whitlockite) tricalcium phosphates, tetracalcium phosphate (TTCP), calcium oxide, and calcium pyrophosphates. Quantification of the minor crystalline components has proven to be very unreliable due to extreme overlap and confounding of X-ray diffraction peaks. Therefore, this practice addresses the quantification of only HA, ß-TCP, and CaO.1.3 This practice was developed for plasma-sprayed HA coatings with HA contents of at least 50?% of the total coating. It is

Number of pages: 4

International relationships :

ICS: 25.220.99 - Other treatments and coatings

Item number: A001504