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Effect of heat treatment on pulsed laser deposited amorphous calcium phosphate coatings

✍ Scribed by Garc�a, F. ;Arias, J. L. ;Mayor, B. ;Pou, J. ;Rehman, I. ;Knowles, J. ;Best, S. ;Le�n, B. ;P�rez-Amor, M. ;Bonfield, W.

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
295 KB
Volume
43
Category
Article
ISSN
0021-9304

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✦ Synopsis

Amorphous calcium phosphate coatings were produced by pulsed laser deposition from targets of nonstoichiometric hydroxyapatite (Ca/P Å 1.70) at a low substrate temperature of 300 ЊC. They were heated in air at different temperatures: 300, 450, 525 and 650 ЊC. Chemical and structural analyses of these coatings were performed using X-ray diffraction (XRD), FTIR, and SEM. XRD analysis of the as-deposited and heated coatings revealed that their crystallinity improved as heat treatment temperature increased. The main phase was apatitic, with some b-tricalcium phosphate in the coatings heated at 525 and 600 ЊC. In the apatitic phase there was some carbonate substitution for phosphate and hydroxyl ions at 450 ЊC and almost solely for phosphate at 525 and 600 ЊC as identified by FTIR. This was accompanied by a higher hydroxyl content at 525 and 600 ЊC. At 450 ЊC a texture on the coating surface was observable by SEM that was attributable to a calcium hydroxide and calcite formation by XRD. These phases almost disappeared at 600 ЊC, probably due to a transformation into calcium oxide.

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