TY - JOUR

T1 - Effect of heat treatment on pulsed laser deposited amorphous calcium phosphate coatings

AU - García, F.

AU - Arias, J.L.

AU - Mayor, B.

AU - Pou, J.

AU - Rehman, I.

AU - Knowles, J.

AU - Best, S.

AU - León, B.

AU - Pérez-Amor, M.

AU - Bonfield, W.

PY - 1998

Y1 - 1998

N2 - Amorphous calcium phosphate coatings were produced by pulsed laser deposition from targets of nonstoichiometric hydroxyapatite (Ca/P = 1.70) at a low substrate temperature of 300 °C. They were heated in air at different temperatures: 300, 450, 525 and 650 °C. 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 β-tricalcium phosphate in the coatings heated at 525 and 600 °C. In the apatitic phase there was some carbonate substitution for phosphate and hydroxyl ions at 450 °C and almost solely for phosphate at 525 and 600 °C as identified by FTIR. This was accompanied by a higher hydroxyl content at 525 and 600 °C. At 450 °C 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 °C, probably due to a transformation into calcium oxide. Amorphous calcium phosphate coatings were produced by pulsed laser deposition from targets of nonstoichiometric hydroxyapatite (Ca/P = 1.70) at a low substrate temperature of 300°C. They were heated in air at different temperatures: 300, 450, 525 and 650°C. 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 β-tricalcium phosphate in the coatings heated at 525 and 600°C. In the apatitic phase there was some carbonate substitution for phosphate and hydroxyl ions at 450°C and almost solely for phosphate at 525 and 600°C as identified by FTIR. This was accompanied by a higher hydroxyl content at 525 and 600°C. At 450°C 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°C, probably due to a transformation into calcium oxide.

AB - Amorphous calcium phosphate coatings were produced by pulsed laser deposition from targets of nonstoichiometric hydroxyapatite (Ca/P = 1.70) at a low substrate temperature of 300 °C. They were heated in air at different temperatures: 300, 450, 525 and 650 °C. 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 β-tricalcium phosphate in the coatings heated at 525 and 600 °C. In the apatitic phase there was some carbonate substitution for phosphate and hydroxyl ions at 450 °C and almost solely for phosphate at 525 and 600 °C as identified by FTIR. This was accompanied by a higher hydroxyl content at 525 and 600 °C. At 450 °C 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 °C, probably due to a transformation into calcium oxide. Amorphous calcium phosphate coatings were produced by pulsed laser deposition from targets of nonstoichiometric hydroxyapatite (Ca/P = 1.70) at a low substrate temperature of 300°C. They were heated in air at different temperatures: 300, 450, 525 and 650°C. 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 β-tricalcium phosphate in the coatings heated at 525 and 600°C. In the apatitic phase there was some carbonate substitution for phosphate and hydroxyl ions at 450°C and almost solely for phosphate at 525 and 600°C as identified by FTIR. This was accompanied by a higher hydroxyl content at 525 and 600°C. At 450°C 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°C, probably due to a transformation into calcium oxide.

KW - Calcium phosphate coatings

KW - Heat treatment

KW - Pulsed laser deposition

KW - Recrystallization

KW - Structural analysis

KW - Amorphous materials

KW - Deposition

KW - Fourier transform infrared spectroscopy

KW - Phase transitions

KW - Pulsed laser applications

KW - Recrystallization (metallurgy)

KW - Scanning electron microscopy

KW - Substitution reactions

KW - Surface structure

KW - X ray diffraction analysis

KW - Amorphous calcium phosphate coatings

KW - Hydroxyapatite

KW - Phosphate coatings

KW - calcium phosphate

KW - hydroxyapatite

KW - article

KW - crystallization

KW - laser

KW - prosthesis fixation

KW - structure analysis

KW - X ray diffraction

KW - Calcium Phosphates

KW - Heat

KW - Lasers

KW - Materials Testing

KW - Microscopy, Electron, Scanning

KW - Spectroscopy, Fourier Transform Infrared

KW - X-Ray Diffraction

U2 - 10.1002/(SICI)1097-4636(199821)43:1<69::AID-JBM8>3.0.CO;2-K

DO - 10.1002/(SICI)1097-4636(199821)43:1<69::AID-JBM8>3.0.CO;2-K

M3 - Journal article

VL - 43

SP - 69

EP - 76

JO - Journal of Biomedical Materials Research Part A

JF - Journal of Biomedical Materials Research Part A

SN - 0021-9304

IS - 1

ER -