Chemical properties of hydroxyapatite deposited through electrophoretic process on different sandblasted samples

Gradinariu, Irina; Ştirbu, I; Gheorghe, C.; Cimpoeşu, Nicanor; Agop, M.; Cimpoeșu, Ramona; Popa, Cristina

doi:10.2478/s13536-014-0241-x

Cited by 3 publications

(3 citation statements)

References 11 publications

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“…in the case of liquid cooling media that have a vaporization temperature lower than the surface temperature of the heattreated sample, four stages occur, depending on the temperature difference between the metal surface and the cooling medium [5][6][7]: a) instantaneous cooling of the metal surface, by sudden heating of the liquid medium by approaching the part until the vaporization temperature is reached; b) heating, which consists of the formation of a vapor coating on the sample surface and which reduces the heat exchange rate;…”

Section: Introductionmentioning

confidence: 99%

Study of the Effect of Intensity of Vibrations and Temperature on the Cooling Characteristics of Quenching Media

Perju,

Nejneru,

Burduhos-Nergis

et al. 2023

Archives of Metallurgy and Materials

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Study of the effect of IntenSIty of VIbratIonS and temperature on the coolIng characterIStIcS of QuenchIng medIaQuenching technology requires the use of media with different cooling intensities and various shapes of cooling curves that show different particularities compared to that of conventional media such as water, oil, or emulsions. The use of synthetic quenching media is relatively new and also has multiple advantages such as non-flammability, safety in use and low cost. in this study, the cooling media tested was obtained by mixing 2 wt% carboxymethyl cellulose with 2 wt% Naoh in one litter of water. Moreover, three different temperatures (20°C, 40°C and 60°C) of the quenching media were evaluated. By dissolution in water, a synthetic solution with low viscosity, surfactant and lubricant was obtained. Because carboxymethyl cellulose is a biodegradable organic material, that is obtained as a by-product in the manufacture of paper, a basic substance with a preservative effect was added. according to this study, both the variation diagram of the heat transfer coefficient and the diagram of the cooling rates, during the cooling stages give important indications regarding the use of a liquid cooling medium for quenching.

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Section: Introductionmentioning

confidence: 99%

Study of the Effect of Intensity of Vibrations and Temperature on the Cooling Characteristics of Quenching Media

Perju,

Nejneru,

Burduhos-Nergis

et al. 2023

Archives of Metallurgy and Materials

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“…Hydroxyapatite (HA) in large or small quantities is not toxic to biological cells) and is almost inactive in biological environments. Additionally, numerous studies have investigated and confirmed the excellent properties of hydroxyapatite in contact with bone tissues [15,16]. The most efficient method of enhancing the osteogenesis of Ti-based alloys in medical implants is covering them with a bioactive layer such as hydroxyapatite.…”

Section: Introductionmentioning

confidence: 99%

Corrosion-Resistance Analysis of HA Layer Deposited through Electrophoresis on Ti4Al4Zr Metallic Substrate

et al. 2021

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An alloy surface with possible applications in the medical field, Ti4A14Zr, was improved through the deposition of a thin hydroxyapatite (HA) layer. In this paper, we analyzed the growth of a HA layer through electrophoresis and the corrosion resistance of the metallic sample covered with the ceramic layer. The substrate surface was processed via chemical procedures before the HA deposition. The state of the metallic surface and that of the layer of HA were investigated using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) analysis of the chemical composition. The results indicate a high increase in the corrosion resistance associated with the ceramic layer compared to the metallic basic layer. Moreover, the analysis revealed the formation of a homogeneous TiO2 layer on the surface of the metallic substrate. The titanium oxide layer identified by SEM–EDS and confirmed by EIS was very homogeneous and resistant, with a compact microstructural appearance and submicron dimension. The layer composed of TiO2 and HA provided good corrosion protection.

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“…Therefore, as an alternative to conventional quenching media were tested and used for quenching the synthetic media, usually chosen from chemical waste substances obtained from paper processing, petroleum products etc. Quenching media of this type can be classified into three main groups: aqueous solutions of plastics; mixtures of different substances that forms gels; oil in water emulsions [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Synthetic Quenching Media for Hardening

Perju

Tugui

Nejneru

2015

KEM

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For a number of methods used in the cooling heat treatment technique, are required quenching media with cooling rate lower than that of water and larger than that of oil. This can be achieved in industrial practice by using the synthetic quenching type media like gels or emulsions. The synthetic quenching coolants offer advantages such as non-flammability, safety of use and low cost price. The cooling medium to be tested is emulsifiable oil dissolved in water at various concentrations and the testing temperature is 50°C. In the paper were measured cooling curves for specified synthetic media and calculated for the same media the cooling rate variation and heat transfer coefficient on intervals. The experimental data were compared with those obtained from traditional media: water and heat treatment oil TT 50.

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Chemical properties of hydroxyapatite deposited through electrophoretic process on different sandblasted samples

Cited by 3 publications

References 11 publications

Study of the Effect of Intensity of Vibrations and Temperature on the Cooling Characteristics of Quenching Media

Study of the Effect of Intensity of Vibrations and Temperature on the Cooling Characteristics of Quenching Media

Corrosion-Resistance Analysis of HA Layer Deposited through Electrophoresis on Ti4Al4Zr Metallic Substrate

Assessment of Synthetic Quenching Media for Hardening

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