Further studies on the effect of stand-off distance on characteristics of plasma sprayed hydroxyapatite coating

Lu, Yu; Li, S.T.; Zhu, Rong; Li, M.S.

doi:10.1016/s0257-8972(02)00166-4

Cited by 19 publications

(7 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar findings have been observed by Gross et al (12) for the plasma sprayed HA coatings. It was shown by Lu et al (13) that the plasma sprayed HA coatings from powder particle size of 10-20 μm contain a large amount of amorphous phase. They further proposed a post heat treatment of HA coatings at 600 °C, which is sufficient to achieve complete crystallization of the structural features.…”

Section: Xrd Analysismentioning

confidence: 99%

“…Amorphous calcium phosphate is preferred to crystalline HA when rapid bone growth is necessary. In vivo dissolution of HA coatings can be adjusted by modifying the phase composition of the coating to enhance appropriate bone growth (13,24).…”

Section: Biocompatibility Studiesmentioning

confidence: 99%

“…Flame sprayed HA coatings on TAV substrates has been reported to have surface roughness of 6.25 μm (27). It has been shown that surface roughness is beneficial for earlier bone growth on implant surface which increases cell adherence (13).…”

Section: Biocompatibility Studiesmentioning

confidence: 99%

See 2 more Smart Citations

Characterization of Thermal Sprayed Hydroxyapatite Coatings on Some Biomedical Implant Materials

Singh¹,

Singh

Singh³

2014

Journal of Applied Biomaterials & Functional Materials

View full text Add to dashboard Cite

show abstract

Section: Xrd Analysismentioning

confidence: 99%

Section: Biocompatibility Studiesmentioning

confidence: 99%

See 1 more Smart Citation

Characterization of Thermal Sprayed Hydroxyapatite Coatings on Some Biomedical Implant Materials

Singh¹,

Singh

Singh³

2014

Journal of Applied Biomaterials & Functional Materials

View full text Add to dashboard Cite

show abstract

“…Spray distance also affects the temperature of the work piece and thus coating deposition. An increase of spray distance causes coating properties to deteriorate as investigated by several researchers ( Ref 15,20,32). The traverse speed chosen was the one that was optimized by Stokes (Ref 33), which was 200 mm/s, and the same was used, but this can also have an influence on coating buildup ( Ref 34,35).…”

Section: Parameter Selectionmentioning

confidence: 99%

Design of Experiment Analysis of the Sulzer Metco DJ High Velocity Oxy-Fuel Coating of Hydroxyapatite for Orthopedic Applications

Hasan

Stokes

2010

J Therm Spray Tech

View full text Add to dashboard Cite

High Velocity Oxy-Fuel (HVOF) has the potential to produce hydroxyapatite (HA; Bio-ceramic) coatings based on its experience with other sprayed ceramic materials. This technique should offer mechanical and biological results comparable to other thermal spraying processes, such as atmospheric plasma thermal spray, currently FDA approved for HA deposition. Deposition of HA via HVOF is a new venture especially using the Sulzer Metco Diamond Jet (DJ) process, and the aim of this article was to establish this technique's potential in providing superior HA coating results compared to the FDAapproved plasma spray technique. In this research, a Design of Experiment (DOE) model was developed to optimize the Sulzer Metco DJ HVOF process for the deposition of HA. In order to select suitable ranges for the production of HA coatings, the parameters were first investigated. Five parameters (factors) were researched over two levels namely: oxygen flow rate, propylene flow rate, air flow rate, spray distance, and powder flow rate. Coating crystallinity and purity were measured at the surface of each sample as the responses to the factors used. The research showed that propylene, air flow rate, spray distance, and powder feed rate had the largest effect on the responses, and the study aimed to find the preferred optimized settings to achieve high crystallinity and purity of percentages of up to 95%. This research found crystallinity and purity values of 93.8 and 99.8%, respectively, for a set of HVOF parameters which showed improvement compared to the crystallinity and purity values of 87.6 and 99.4%, respectively, found using the FDA-approved Sulzer Metco Atmospheric Plasma thermal spray process. Hence, a new technique for HA deposition now exists using the DJ HVOF facility; however, other mechanical and biorelated properties must also be assessed.

show abstract

“…This change occurred because amorphous HA appeared in the film. However, this Ca/P ratio and the degree of crystallinity of the HA film may influence the promotion of the biological response within the early healing stage after implantation [5,[22][23][24][25]. Some studies have claimed that pure HA is the most stable mineral and does not easily degrade in the body; therefore, it can increase the success rate of implants through the use of a thermal spray coating.…”

Section: Characterization Of Hydroxyapatite-sputtered Filmsmentioning

confidence: 99%

Characterization of Hydroxyapatite (HA) Sputtering Targets by APS Methods

et al. 2017

View full text Add to dashboard Cite

Radio frequency (RF) sputtering is a potential medical device coating technology that is commercializable; however, a suitable commercialized target for sputtering the hydroxyapatite (HA) coating onto titanium medical devices is more important. Therefore, this study used three HA targets in conducting sputtering experiments for HA films, which were manufactured in a laboratory by using three different processes: cold pressing and sintering (CPS), hot isostatic pressing (HIP), and atmospheric plasma spraying (APS). Subsequently, the sputtering performance of each type of target and the properties of the HA films were assessed to develop an appropriate process for modifying the surfaces of medical devices. The experimental results showed that the APS target, with a density of approximately 2.83 g/cm 3 , was suitable for use in HA sputtering. Additionally, the APS target could withstand a high discharge power over 300 W, whereas the CPS target could nearly endure a power below 70 W. The APS target, with Ca/P ratio of 2.401, consisted of a combination of HA, α-tricalcium phosphate (α-TCP), β-TCP, and tetracalcium phosphate phases (TTCP). In addition to being able to perform at a high sputtering power of more than 300 W, the APS target achieved a higher deposition rate than did the CPS target. This study shows that the processing technology used for the APS target is a potential method for applying HA sputtering for the surface modification of artificial aggregates.

show abstract

Further studies on the effect of stand-off distance on characteristics of plasma sprayed hydroxyapatite coating

Cited by 19 publications

References 15 publications

Characterization of Thermal Sprayed Hydroxyapatite Coatings on Some Biomedical Implant Materials

Characterization of Thermal Sprayed Hydroxyapatite Coatings on Some Biomedical Implant Materials

Design of Experiment Analysis of the Sulzer Metco DJ High Velocity Oxy-Fuel Coating of Hydroxyapatite for Orthopedic Applications

Characterization of Hydroxyapatite (HA) Sputtering Targets by APS Methods

Contact Info

Product

Resources

About