HVOF Sprayed Hydroxyapatite/Titania Composite Coatings

K. A. Khor; H. Li; P. Cheang

HVOF Sprayed Hydroxyapatite/Titania Composite Coatings

K. A. Khor^*, H. Li, P. Cheang

^*Corresponding author for this work

Nanyang Technological University

Research output: Contribution to conference › Paper › peer-review

1 Citation (Scopus)

Abstract

As ceramic materials, the use of hydroxyapatite (HA) in clinical applications is severely limited by its intrinsic poor mechanical properties. The incorporation of some bioinert ceramics is believed to be a way to improve the mechanical reliability of HA matrix. HA coatings with titania addition were produced by using high velocity oxy-fuel (HVOF) spraying process in the present study. The mechanical properties of the as-sprayed coatings in terms of adhesive strength, shear strength and fracture toughness were investigated aiming to reveal the reinforcing effect of the titania addition in HA coatings. Qualitative phase analysis through X-ray diffraction (XRD) showed that mutual chemical reaction between TiO ₂ and HA occurred during coating formation, from which CaTiO ₃ was resulted. Totally unmelted titania powders were observed which suggests that the mutual reaction locates at HA/TiO ₂ splats' interface. Significant influence of coating microstructure on mechanical properties was revealed. As the content of titania in HA coatings reached 20vol%, the adhesive strength decreased largely. As the content of titania reached 30vol%, the further augmentation of the adhesive strength of is possibly resulted from the improved coating microstructure. The fracture toughness exhibited the values of 0.48 MPam ^1/2, 0.60 MPam ^1/2 and 0.67MPam ^1/2 for pure HA coating, 10vol% TiO ₂ blended HA coating and 20vol% TiO ₂ blended HA coating, respectively.

Original language	English
Pages	245-250
Number of pages	6
Publication status	Published - 2001
Externally published	Yes
Event	Thermal Spray 2001 New Surfaces for a New Millennium: Proceedings of the International Thremal Spray Conferences - Singapore, Singapore Duration: May 28 2001 → May 30 2001

Conference

Conference	Thermal Spray 2001 New Surfaces for a New Millennium: Proceedings of the International Thremal Spray Conferences
Country/Territory	Singapore
City	Singapore
Period	5/28/01 → 5/30/01

ASJC Scopus Subject Areas

Surfaces and Interfaces
Surfaces, Coatings and Films
Materials Chemistry

Cite this

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title = "HVOF Sprayed Hydroxyapatite/Titania Composite Coatings",

abstract = "As ceramic materials, the use of hydroxyapatite (HA) in clinical applications is severely limited by its intrinsic poor mechanical properties. The incorporation of some bioinert ceramics is believed to be a way to improve the mechanical reliability of HA matrix. HA coatings with titania addition were produced by using high velocity oxy-fuel (HVOF) spraying process in the present study. The mechanical properties of the as-sprayed coatings in terms of adhesive strength, shear strength and fracture toughness were investigated aiming to reveal the reinforcing effect of the titania addition in HA coatings. Qualitative phase analysis through X-ray diffraction (XRD) showed that mutual chemical reaction between TiO 2 and HA occurred during coating formation, from which CaTiO 3 was resulted. Totally unmelted titania powders were observed which suggests that the mutual reaction locates at HA/TiO 2 splats' interface. Significant influence of coating microstructure on mechanical properties was revealed. As the content of titania in HA coatings reached 20vol%, the adhesive strength decreased largely. As the content of titania reached 30vol%, the further augmentation of the adhesive strength of is possibly resulted from the improved coating microstructure. The fracture toughness exhibited the values of 0.48 MPam 1/2, 0.60 MPam 1/2 and 0.67MPam 1/2 for pure HA coating, 10vol% TiO 2 blended HA coating and 20vol% TiO 2 blended HA coating, respectively.",

author = "Khor, {K. A.} and H. Li and P. Cheang",

year = "2001",

language = "English",

pages = "245--250",

note = "Thermal Spray 2001 New Surfaces for a New Millennium: Proceedings of the International Thremal Spray Conferences ; Conference date: 28-05-2001 Through 30-05-2001",

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T1 - HVOF Sprayed Hydroxyapatite/Titania Composite Coatings

AU - Khor, K. A.

AU - Li, H.

AU - Cheang, P.

PY - 2001

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N2 - As ceramic materials, the use of hydroxyapatite (HA) in clinical applications is severely limited by its intrinsic poor mechanical properties. The incorporation of some bioinert ceramics is believed to be a way to improve the mechanical reliability of HA matrix. HA coatings with titania addition were produced by using high velocity oxy-fuel (HVOF) spraying process in the present study. The mechanical properties of the as-sprayed coatings in terms of adhesive strength, shear strength and fracture toughness were investigated aiming to reveal the reinforcing effect of the titania addition in HA coatings. Qualitative phase analysis through X-ray diffraction (XRD) showed that mutual chemical reaction between TiO 2 and HA occurred during coating formation, from which CaTiO 3 was resulted. Totally unmelted titania powders were observed which suggests that the mutual reaction locates at HA/TiO 2 splats' interface. Significant influence of coating microstructure on mechanical properties was revealed. As the content of titania in HA coatings reached 20vol%, the adhesive strength decreased largely. As the content of titania reached 30vol%, the further augmentation of the adhesive strength of is possibly resulted from the improved coating microstructure. The fracture toughness exhibited the values of 0.48 MPam 1/2, 0.60 MPam 1/2 and 0.67MPam 1/2 for pure HA coating, 10vol% TiO 2 blended HA coating and 20vol% TiO 2 blended HA coating, respectively.

AB - As ceramic materials, the use of hydroxyapatite (HA) in clinical applications is severely limited by its intrinsic poor mechanical properties. The incorporation of some bioinert ceramics is believed to be a way to improve the mechanical reliability of HA matrix. HA coatings with titania addition were produced by using high velocity oxy-fuel (HVOF) spraying process in the present study. The mechanical properties of the as-sprayed coatings in terms of adhesive strength, shear strength and fracture toughness were investigated aiming to reveal the reinforcing effect of the titania addition in HA coatings. Qualitative phase analysis through X-ray diffraction (XRD) showed that mutual chemical reaction between TiO 2 and HA occurred during coating formation, from which CaTiO 3 was resulted. Totally unmelted titania powders were observed which suggests that the mutual reaction locates at HA/TiO 2 splats' interface. Significant influence of coating microstructure on mechanical properties was revealed. As the content of titania in HA coatings reached 20vol%, the adhesive strength decreased largely. As the content of titania reached 30vol%, the further augmentation of the adhesive strength of is possibly resulted from the improved coating microstructure. The fracture toughness exhibited the values of 0.48 MPam 1/2, 0.60 MPam 1/2 and 0.67MPam 1/2 for pure HA coating, 10vol% TiO 2 blended HA coating and 20vol% TiO 2 blended HA coating, respectively.

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ER -

HVOF Sprayed Hydroxyapatite/Titania Composite Coatings

Abstract

Conference

ASJC Scopus Subject Areas

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