Plasma sprayed hydroxyapatite coatings on titanium substrates Part 2: optimisation of coating properties

Tsui, Y.C.; Doyle, Christina; Clyne, T.W.

doi:10.1016/s0142-9612(98)00104-5

Cited by 196 publications

(107 citation statements)

References 30 publications

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“…Many investigations have reported that bond strength of the coatings was apparently related to different deposition techniques and post-treatment parameters. 5,21,24,27) For example, Tsui et al 21) found that heat treatment at 700 C for 1 h was effective in enhancing crystallinity, the OH À ion content and the purity of plasma sprayed HA coatings. However, a significant drop in adhesion occurred on heat-treated coatings sprayed at high powers of 36 kW.…”

Section: Bond Strengthmentioning

confidence: 99%

“…16) As suggested by Darimont et al, the implants in trabecular or cancellous bone would require coatings with a very high crystallinity. 17) For improving the quality of plasma sprayed coatings, the heat treatment is sometimes a used method to increase coating crystallinity and reduce the residual stress of HA-based coatings, 5,6,15,[18][19][20][21][22][23] aside from optimizing plasma spray processing and altering material composition. 14,24,25) Caulier et al confirmed in a goat animal model that heat-treated HA plasma-sprayed implant showed less reduction in coating thickness than as-sprayed HA coatings.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Heat Treatment on Characteristics of Plasma Sprayed Hydroxyapatite Coatings

Chen

Ding

2006

Mater. Trans.

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Bioactive hydroxyapatite (HA)-coated implants plasma sprayed on Ti6Al4V substrates have been widely used in load-bearing applications because of their biocompatibility and their intimate contact with bone. The improvement of the characteristics of HA coatings is concerned. The purpose of this work was to evaluate corrosion behavior and bond strength of HA coatings after post-deposition heat treatment at 500-700 C. The results indicated that the heat treatment led to recrystallization of amorphous calcium phosphate of as-sprayed HA coatings. The reduction of layer defects associated with plasma-sprayed coatings and the enhancement of the resistance to corrosion took place after heat treatment. Bond strength of the heat-treated coatings was sensitive to the treatment temperature. It is concluded that the heat treatment at 600C for 1 h in air, endowing with increased crystallinity and the reduced defects without significantly reduced bond strength, provided a better corrosion protection than the other two treatment temperatures.

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Section: Bond Strengthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Heat Treatment on Characteristics of Plasma Sprayed Hydroxyapatite Coatings

Chen

Ding

2006

Mater. Trans.

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“…In our previous study, 19) better mechanical properties of HACs can be acquired by a higher power condition due to little spraying defects, but the high enthalpy will also induce phase transformation and generate significant increases of amorphous HA and impurity phases. On the other hand, additionally conducting a post heat treatment at 700 C for 1 h in ambient air atmosphere shows the possibility to acquire better coating properties, 23) although the fracture toughness of HA tends to decrease from 0.83 MPa m 1=2 (as-sprayed) to 0.40 MPa m 1=2 (heat treatment). It is suitable to suggest that the deterioration could be caused by above mentioned high temperature (700 C) treatment due to the loss of OH À ion.…”

Section: Effect Of Heating Temperature On Hacs Morphologymentioning

confidence: 99%

Effect of Hydrothermal Treatment on Microstructural Feature and Bonding Strength of Plasma-Sprayed Hydroxyapatite on Ti-6Al-4V

et al. 2004

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The effects of hydrothermal treating temperature on bonding strength pertaining to the microstructural evolution of plasma-sprayed hydroxyapatite coatings (HACs) on Ti-6Al-4V substrate were investigated. On the basis of the observed microstructure, the as-sprayed amorphous and impurity phases, such as -Ca 3 (PO 4 ) 2 , Ca 4 P 2 O 9 and CaO transform into crystalline HA after performing the hydrothermal treatment. Additionally, ultrafine crystallized particles can be recognized that the nucleation and grain growth occur by hydrothermal treatment at elevated temperatures of 175 C and 200 C. Furthermore, the hydrothermal treatment between 100 C and 150 C shows a significant decrease in microcracks, corresponding to an increase in bonding strength. This study reveals that even a small variation of hydrothermal heating temperature under 200 C can cause significant changes of the microstructural morphologies. Combining the experimental results of spraying defects, microstructural evolution and bonding strength, the knowledge of the hydrothermal-treated HACs will be helpful for the understanding and prediction in the biological stability and mechanical stability of HACs in the long-term clinical use.

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“…This paper investigates a new method, CoBlast TM , for depositing a PTFE coating onto superelastic NiTi wire. It is an ambient temperature process developed to address the problems associated with high temperature-coating techniques, such as the formation of unwanted phases, amorphization of the coating and poor adherence of the coating [5][6][7][8][9][10][11][12][13][14]. The coating produced with CoBlast is composed of separated particles firmly embedded within the substrate instead of the laminar structure typical of other coating techniques.…”

Section: Introductionmentioning

confidence: 99%

Blast Coating of Superelastic NiTi Wire with PTFE to Enhance Wear Properties

Dunne

Roche

Twomey

et al. 2015

Shap. Mem. Superelasticity

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This work investigates the deposition of polytetrafluoroethylene (PTFE) onto a superelastic NiTi wire using an ambient temperature-coating technique known as CoBlast. The process utilises a stream of abrasive (Al 2 O 3 ) and a coating medium (PTFE) sprayed simultaneously at the surface of the substrate. Superelastic NiTi wire is used in guidewire applications, and PTFE coatings are commonly applied to reduce damage to vessel walls during insertion and removal, and to aid in accurate positioning by minimising the force required to advance, retract or rotate the wire. The CoBlast coated wires were compared to wire treated with PTFE only. The coated samples were examined using variety of techniques: X-ray diffraction (XRD), microscopy, surface roughness, wear testing and flexural tests. The CoBlast coated samples had an adherent coating with a significant resistance to wear compared to the samples coated with PTFE only. The XRD revealed that the process gave rise to a stress-induced martensite phase in the NiTi which may enhance mechanical properties. The study indicates that the CoBlast process can be used to deposit thin adherent coatings of PTFE onto the surface of superelastic NiTi.

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Plasma sprayed hydroxyapatite coatings on titanium substrates Part 2: optimisation of coating properties

Cited by 196 publications

References 30 publications

Effect of Heat Treatment on Characteristics of Plasma Sprayed Hydroxyapatite Coatings

Effect of Heat Treatment on Characteristics of Plasma Sprayed Hydroxyapatite Coatings

Effect of Hydrothermal Treatment on Microstructural Feature and Bonding Strength of Plasma-Sprayed Hydroxyapatite on Ti-6Al-4V

Blast Coating of Superelastic NiTi Wire with PTFE to Enhance Wear Properties

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