Post-deposition heat treatments for ion beam sputter deposited calcium phosphate coatings

Ong, Joo L.; Lucas, L. C.

doi:10.1016/0142-9612(94)90245-3

Cited by 127 publications

(64 citation statements)

References 11 publications

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“…Some cracks were recognized in the furnace-heated coatings after immersion in SBF, even when the temperature was 500°C. This treatment was lower than that in the previous study and that recommended by Ong et al (1994), even when specimens were heated under vacuum. The heat treatment must have produced stresses at the interface between the Ca-P coating and the Ti substrate by density changes in the film and the mismatch of thermal expansion between them (Aoki, 1991;Chen and Lacefield, 1994).…”

Section: Discussioncontrasting

confidence: 40%

“…These deposited coatings were amorphous, resulting in films that easily dissolved in simulated body fluid and crystalized during heat treatment Ong et al, 1994;van Dijk et al, 1996). The film coatings, however, tended to crack easily with conventional heat treatment in an electric furnace (Ong et al, 1994;Yoshinari et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

“…The film coatings, however, tended to crack easily with conventional heat treatment in an electric furnace (Ong et al, 1994;Yoshinari et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

“…The physical vapor deposition (PVD) technique has been introduced in dental implant appliances as a thin-film technique, with ion-sputtering (Lacefield, 1988;Lacefield et al, 1991;Cooley et al, 1992;Ong et al, 1992;Jansen et al, 1993;Ong and Lucas, 1994;Wolke et al, 1994;van Dijk et al, 1995van Dijk et al, , 1996 and ion-plating (Yoshinari et al, 1991). The ionbeam dynamic-mixing (IBDM) method was also introduced as a suitable technique for the fabrication of a thin and adherent ceramic layer Yoshinari et al, 1994Yoshinari et al, , 1996.…”

Section: Introductionmentioning

confidence: 99%

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Solubility Control of Thin Calcium-phosphate Coating with Rapid Heating

Yoshinari

Watanabe

Ohtsuka³

et al. 1997

J Dent Res

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Abstract. The thin calcium-phosphate (Ca-P) coatings produced by the ion-beam-mixing method instead of the plasma-spraying method have been found to be amorphous, resulting in films that easily dissolved in simulated body fluid. These coatings crystalized with conventional heat treatment in an electric furnace but tended to crack easily. Therefore, the purpose of this study was to find a suitable heat treatment that controls the solubility of Ca-P coatings without weakening their adhesion to titanium (Ti) substrate.Thin coatings (approximately 1 lim) were coated onto Ti substrates, followed by heat treatment in a conventional furnace and rapid heating by infrared radiation and laser radiation. X-ray diffraction analysis revealed untreated films to be amorphous but to become crystalline after being heated in a fumace at 500'C, heated rapidly with infrared radiation higher than 600°C and with laser radiation at output power of 10W. We evaluated solubility by estimating the film thickness after immersion in simulated body fluid for 5 weeks: Untreated films dissolved within 1 day. Coatings treated with infrared radiation at 600°C dissolved minimally. Cracks were observed in coatings subjected to infrared radiation at 800°C and fumace-heated at 500°C. Coatings treated with laser radiation tended to dissolve easily, with non-uniform surface degradation. Xray photoelectron spectroscopy analysis at the interface between the coating and the Ti substrate showed that cracks were the result of decreased Ca-implanted layers and too much growth of Ti-P compounds. No difference was recognized in the Ti-oxidation state among specimens. These data indicate that rapid, homogeneous, and comparatively low-temperature heating, such as defocused infrared radiation, controls Ca-P solubility and ensures the adherence of the coatings to the substrate.

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Section: Discussioncontrasting

confidence: 40%

Section: Introductionmentioning

confidence: 99%

“…The film coatings, however, tended to crack easily with conventional heat treatment in an electric furnace (Ong et al, 1994;Yoshinari et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Solubility Control of Thin Calcium-phosphate Coating with Rapid Heating

Yoshinari

Watanabe

Ohtsuka³

et al. 1997

J Dent Res

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“…Specifically, the biocompatibility of the HA and the osteoconductivity behavior of this ceramic material were confirmed and employed in medicine for more than 25 years. 4 Hydroxyapatite coatings have been applied by a variety of methods: Dip coating, 5,6 electrophoretic deposition, 7,8 hot isostatic pressing, 5 ion beam sputtering, 9 ion beam dynamic mixing, 10 plasma spraying, 11 conventional flame spraying, 12,13 and high-velocity oxy-fuel combustion spraying. 14 Among these, plasma spray appears to be most favorable in terms of chemical control, biocorrosion resistance, 15,16 process efficiency, 2 and the degree to which the surface fatigue resistance is reduced.…”

Section: Introductionmentioning

confidence: 99%

Cytocompatibility by MTT Assay and Platelet Adhesion of Ti and Ti-6Al-4V coated with Hydroxyapatite in different Plasma Gas Atmospheres

Kotian

Madhyastha

Shobha

et al. 2017

World Journal of Dentistry

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Aim: This study was performed to evaluate the biocompatibility of pure titanium and Ti-6Al-4V metals coated with hydroxyapatite (HA) by plasma spray using different plasma gas atmospheres. Materials and methods:The cell viabilities for each HA-coated sample in an atmosphere of argon, argon-hydrogen, nitrogen, and nitrogen-hydrogen were studied using MTT assay and platelet adhesion test. Results:The mean cell viabilities by MTT [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide] assay of samples coated with HA in argon-hydrogen plasma atmosphere showed maximum cell viability at different time intervals compared with other coating atmospheres of argon-hydrogen, nitrogen, and nitrogen-hydrogen. A statistically significant value of cell viability (p < 0.001) was observed between and within the groups of argon, argon-hydrogen, nitrogen, and nitrogen-hydrogen plasma gas atmosphere. The platelet adhesion study showed agglomerates of platelet cells in some isolated regions of HA for all atmospheres. Significance:The results obtained in this study can serve as a guide for the development of new Ti-based HA-coated implants in different plasma gas atmospheres.

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Evaluating sol-gel ceramic thin films for metal implant applications. II. Adhesion and fatigue properties of zirconia films on Ti-6Al-4V

Filiaggi

Pilliar

Abdulla

1996

J. Biomed. Mater. Res.

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The degree to which ceramic coatings or thin films applied to bone-interfacing metallic implants can improve the overall performance of these implants with respect to implant fixation, wear, or corrosion relies especially on the response of these films to loading. In this study, the adhesion and fatigue properties of sol-gel zirconia films that could be reproducibly deposited onto polished Ti-6AI-4V substrates was investigated. For zirconia films on the order of 100 nm thick, a shear lag-based strain approach indicated a shear adhesion strength of approximately 275 MPa. Small variations in film thickness and substrate surface preparation had little effect on this adhesion, which was believed to be due to alkoxide molecule interactions with free hydroxyl groups on the substrate surface as well as some limited interfacial diffusion following the 500 degrees C anneal. Subsequent fatigue testing of these films in air using novel tapered rotating beam fatigue samples demonstrated their excellent fatigue characteristics, with films surviving up to 10(7) cycles, the endurance limit of the Ti-6AI-4V (approximately 635 MPa). Overall, the exceptional mechanical properties of this ZrO2/Ti-6AI-4V system along with the inherent advantages of sol-gel processing support continued studies to utilize this technology for implant surface modification.

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Post-deposition heat treatments for ion beam sputter deposited calcium phosphate coatings

Cited by 127 publications

References 11 publications

Solubility Control of Thin Calcium-phosphate Coating with Rapid Heating

Solubility Control of Thin Calcium-phosphate Coating with Rapid Heating

Cytocompatibility by MTT Assay and Platelet Adhesion of Ti and Ti-6Al-4V coated with Hydroxyapatite in different Plasma Gas Atmospheres

Evaluating sol-gel ceramic thin films for metal implant applications. II. Adhesion and fatigue properties of zirconia films on Ti-6Al-4V

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