Study of duty cycle influence on the band gap energy of TiO2/P coatings obtained by PEO process

Torres-Cerón, Darwin Augusto; Acosta-Medina, Carlos Daniel; Escobar-Rincón, Daniel; Ospina, Rogelio

doi:10.1016/j.surfcoat.2019.06.021

Cited by 16 publications

(4 citation statements)

References 40 publications

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“…At lower frequencies, the coatings were rougher with larger pores, and AC conditions were more effective than DC conditions for coating formation. As the duty cycle grew, the discharge period within a single pulse increased, the thickness of the film layer increased, more holes were produced, and the roughness increased when the voltage and frequency were constant ( Torres-Ceron et al, 2019 ).…”

Section: Electrical Characteristics and Power Modementioning

confidence: 99%

Porous construction and surface modification of titanium-based materials for osteogenesis: A review

Wang

et al. 2022

Front. Bioeng. Biotechnol.

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Titanium and titanium alloy implants are essential for bone tissue regeneration engineering. The current trend is toward the manufacture of implants from materials that mimic the structure, composition and elasticity of bones. Titanium and titanium alloy implants, the most common materials for implants, can be used as a bone conduction material but cannot promote osteogenesis. In clinical practice, there is a high demand for implant surfaces that stimulate bone formation and accelerate bone binding, thus shortening the implantation-to-loading time and enhancing implantation success. To avoid stress shielding, the elastic modulus of porous titanium and titanium alloy implants must match that of bone. Micro-arc oxidation technology has been utilized to increase the surface activity and build a somewhat hard coating on porous titanium and titanium alloy implants. More recently, a growing number of researchers have combined micro-arc oxidation with hydrothermal, ultrasonic, and laser treatments, coatings that inhibit bacterial growth, and acid etching with sand blasting methods to improve bonding to bone. This paper summarizes the reaction at the interface between bone and implant material, the porous design principle of scaffold material, MAO technology and the combination of MAO with other technologies in the field of porous titanium and titanium alloys to encourage their application in the development of medical implants.

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Section: Electrical Characteristics and Power Modementioning

confidence: 99%

Porous construction and surface modification of titanium-based materials for osteogenesis: A review

Wang

et al. 2022

Front. Bioeng. Biotechnol.

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“…Структура, состав и морфология ПЭО-покрытий зависят от параметров их получения [15,34,35]. Напряжение положительного импульса в процессе ПЭО влияет на толщину покрытия, средний размер пор и их плотность [36].…”

Section: Introductionunclassified

“…Величина рабочего цикла импульсного режима является еще одной важной характеристикой процесса ПЭО [34]. Большинство работ было посвящено изучению влияния формы и последовательности разрядов, а анализу параметров самих импульсов не было уделено достаточного внимания.…”

Section: Introductionunclassified

Dependence of Morphology, Structure, Composition and Biocompatibility of Ca- and P-Doped TiO2 Coatings on PEO Process Parameters

Ponomarev

Kuptsov

Sheveyko

et al. 2021

Russ. J. Non-ferrous Metals

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Статья поступила в редакцию 23.09.20 г., доработана 21.01.21 г., подписана в печать 25.01.21 г.Аннотация: Изучено влияние параметров биполярного импульсного режима плазменного электролитического окисления (ПЭО) титана: напряжения (U), длительности импульса (t) и продолжительности паузы между импульсами, на структуру и морфологию TiO 2 -покрытий, легированных Са и Р. Определены пороговые значения напряжения (U 1 ) и длительности положительного импульса (t 1 ), при которых поры не образуются. Показано, что при повышении величины U 1 увеличивается размер пор и возрастают концентрации Ca и P в составе TiO 2 -покрытия. Выявлена связь между содержанием в покрытии рутила и концентрациями Ca и P. Установлено, что размер и распределение пор по размеру зависят величины t 1 . Во время короткого положительного импульса формируется структура с мелкими порами, равномерно распределенными по площади образца. При повышении t 1 образуется структура с крупными неравномерно распределенными порами. Увеличение параметров отрицательного импульса (U 2 и t 2 ) приводит к снижению концентраций Ca и P в покрытии, а также уменьшению содержания рутила. Показано, что поверхность TiO 2 -покрытий, полученных методом ПЭО, обеспечивает рост кристаллитов Са-и Р-содержащих фаз при их выдержке в растворе, имитирующем внутреннюю среду организма. Выявлено, что количество апатитоподобного слоя зависит от содержания Са и Р в составе TiO 2 -слоя, а также размера и распределения пор.

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“…The majority of research works have been devoted to studying the electrolyte chemical composition effect on the structure and the properties of the created coatings [16,17,18,19]. However, the influence of the process electrical parameters affects also the formation of the coating, resulting in different surface properties [20,21].…”

Section: Introductionmentioning

confidence: 99%

Study of the Effect of Current Pulse Frequency on Ti-6Al-4V Alloy Coating Formation by Micro Arc Oxidation

2019

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The micro arc oxidation (MAO) process has been applied to produce ceramic oxide coating on Ti-6Al-4V alloy. The MAO process was carried out at the symmetric bipolar square pulse in electrolyte containing Na2CO3 and Na2SiO3. The effect of current frequency on the surface morphology, the chemical and the phase compositions as well as the corrosion resistance was examined. Morphology and cross-sectional investigation by electron microscopy evaluated more compacted and less porous coating produced by high current frequency (1000 Hz). This alloy also exhibited a high corrosion resistance in comparison with the untreated alloy. Additionally, the alloy subjected to MAO treatment by a current frequency of 1000 Hz showed a higher corrosion resistance in comparison with alloys obtained by lower current frequencies. This behavior was attributed to more compacted and less porous morphology of the coating.

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Study of duty cycle influence on the band gap energy of TiO2/P coatings obtained by PEO process

Cited by 16 publications

References 40 publications

Porous construction and surface modification of titanium-based materials for osteogenesis: A review

Porous construction and surface modification of titanium-based materials for osteogenesis: A review

Dependence of Morphology, Structure, Composition and Biocompatibility of Ca- and P-Doped TiO2 Coatings on PEO Process Parameters

Study of the Effect of Current Pulse Frequency on Ti-6Al-4V Alloy Coating Formation by Micro Arc Oxidation

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