Water vapour-treated hydroxyapatite coatings after plasma spraying and their characteristics

Cao, Yang; Weng, Jie; Chen, Jiyong; Feng, Jiaming; Yang, Zuguang; Zhang, Xingdong

doi:10.1016/0142-9612(96)89658-x

Cited by 92 publications

(57 citation statements)

References 14 publications

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“…[37][38][39][40][41][42] The porosity is a characteristic of plasma sprayed coatings and strongly affects their corrosion behaviours. Generally speaking, the corrosion rate increases with increasing porosity in the coatings.…”

Section: à3mentioning

confidence: 99%

“…Generally speaking, the corrosion rate increases with increasing porosity in the coatings. 41) The electrolyte infiltrates into the inner portion of the coating through the structural imperfections such as pores and cracks or pinholes existing in the coating and comes into contact with the deeper portion of the coating, 42) causing corrosion. The polarization resistance (R p ) obtained can be used to determine the porosity that corresponds simply to the ratio of the polarization resistance of the uncoated substrates and the coated samples.…”

Section: à3mentioning

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: à3mentioning

confidence: 99%

Section: à3mentioning

confidence: 99%

Effect of Heat Treatment on Characteristics of Plasma Sprayed Hydroxyapatite Coatings

Chen

Ding

2006

Mater. Trans.

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“…Amorphous content was determined by X-ray diffraction [239,240]. [244] and water vapor treatment [245]. After the vapor-flame treatment, the crystallinity of HA coatings has been observed to increase to 98% [246][247][248].…”

mentioning

confidence: 99%

Surface modification of titanium, titanium alloys, and related materials for biomedical applications

Liu

Chu

Ding

2004

Materials Science and Engineering: R: Reports

3,032

1,477

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Titanium and titanium alloys are widely used in biomedical devices and components, especially as hard tissue replacements as well as in cardiac and cardiovascular applications, because of their desirable properties, such as relatively low modulus, good fatigue strength, formability, machinability, corrosion resistance, and biocompatibility. However, titanium and its alloys cannot meet all of the clinical requirements. Therefore, in order to improve the biological, chemical, and mechanical properties, surface modification is often performed. This article reviews the various surface modification technologies pertaining to titanium and titanium alloys including mechanical treatment, thermal spraying, sol-gel, chemical and electrochemical treatment, and ion implantation from the perspective of biomedical engineering. Recent work has shown that the wear resistance, corrosion resistance, and biological properties of titanium and titanium alloys can be improved selectively using the appropriate surface treatment techniques while the desirable bulk attributes of the materials are retained. The proper surface treatment expands the use of titanium and titanium alloys in the biomedical fields. Some of the recent applications are also discussed in this paper. #

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“…There are other crystalline phases such as a-and j0-tricalcium phosphate (TCP) and tetracalcium phosphate (TTCP). It is important to know the exact crystalline phases in the film since these phases have inferior osteocompatibility than HA coating due to their different crystal structures [23,24]. X-ray diffraction pattern of the film on silicon substrate has been studied and presented elsewhere [25].…”

Section: Resultsmentioning

confidence: 99%

Processing and Development of Nano-Scale HA coatings for Biomedical Application

Rabiei

Thomas

2004

MRS Proc.

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Functionally graded Hydroxyapatite coating with graded Crystallinity across the thickness of the film has been processed and tested as a more effective orthopedic/ dental implant coating. The present study aims to increase the service-life of an orthopedic/ dental implant by creating materials that form a strong, long lasting, bond with the Ti substrate as well as juxtaposed bone. The health relatedness of the new material is to increase bonding between an implant and juxtaposed bone so that a patient who has received joint or dental replacement surgery may quickly return to a normal active lifestyle. Cross-sectional transmission electron microscopy analysis displayed that the films have a graded crystal structure with the crystalline layer near the substrate and the amorphous layer at the top surface. Compositional analysis was performed using SEM-EDX at the top surface as well as STEM-EDX at the cross section of the film. The average calcium to phosphorous ratio at the surface is 1.46, obtained by SEM-EDX, The Ca/P ratios in the crystalline and amorphous layers of the film are 1.6 to 1.7, close to the ratio of 1.67 for HA. INTRODUCTIONIn order to improve the bioactivity of metal implants, Hydroxyapatite (HA: CaJ0(P0 4 )

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Water vapour-treated hydroxyapatite coatings after plasma spraying and their characteristics

Cited by 92 publications

References 14 publications

Effect of Heat Treatment on Characteristics of Plasma Sprayed Hydroxyapatite Coatings

Effect of Heat Treatment on Characteristics of Plasma Sprayed Hydroxyapatite Coatings

Surface modification of titanium, titanium alloys, and related materials for biomedical applications

Processing and Development of Nano-Scale HA coatings for Biomedical Application

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