Microstructure and properties of Ti-Al coating and Ti-Al-Si system coatings on Ti-6Al-4V fabricated by laser surface alloying

Dai, Jingjie; Zhang, Fengyun; Wang, Amin; Yu, Huijun; Chen, Chuanzhong

doi:10.1016/j.surfcoat.2016.10.082

Cited by 70 publications

(24 citation statements)

References 12 publications

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“…When the TA2 sample was immersed into the Al-Si liquid alloy, the Al and Si reacted with Ti to form an intermetallic compound in a reactive wetting mode. Thus, the Al-Si liquid alloy impregnated the TA2 substrate [27,28]. The wetting of the solid sample by the liquid metal is the premise of preparing the hot-dipped coating.…”

Section: Discussionmentioning

confidence: 99%

Micrographic Properties of Composite Coatings Prepared on TA2 Substrate by Hot-Dipping in Al–Si Alloy and Using Micro-Arc Oxidation Technologies (MAO)

Wang

Zhou

et al. 2020

Coatings

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A composite coating composed of intermetallic compounds, Al–Si alloys, and an oxide ceramic layer was prepared on TA2 substrate by hot-dipping Al–Si alloy and micro-arc oxidation (MAO) methods. The microstructure and composition distribution of the resulting hot-dipped Al–Si alloy layer and MAO-caused ceramic layer were studied by scanning electron microscope (SEM) and energy dispersive spectrum (EDS). In addition, the phase composition of the diffusion layer obtained by the Al–Si alloy hot-dipping procedure was investigated by electron backscattered diffraction (EBSD), and the phase structure of the MAO-treated layer was studied by X-ray diffraction (XRD) analysis and X-ray photoelectron spectroscopy (XPS). The MAO method can make the hot-dipped Al–Si alloy layer in-situ oxidized to form a ceramic layer. Finally, a three-layer composite coating composed of a diffusion layer formed by the Ti–Al–Si interdiffusion, an Al–Si alloy layer and a ceramic layer was prepared on TA2 substrate. Compared with TA2 substrate, the TA2 sample with a three-layer composite coating has larger friction coefficient and less abrasion loss. The three-layer composite coating can significantly improve the wear resistance of TA2. A technical composite method was developed to the low cost in-situ growth of alumina-based ceramic wear-resistant coatings on TA2 substrate.

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Section: Discussionmentioning

confidence: 99%

Micrographic Properties of Composite Coatings Prepared on TA2 Substrate by Hot-Dipping in Al–Si Alloy and Using Micro-Arc Oxidation Technologies (MAO)

Wang

Zhou

et al. 2020

Coatings

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“…There are several methods to apply a protective coating onto Ni-based superalloys including ion implantation [13], electro-discharge coating [14,15], high velocity oxy-fuel (HVOF) [16], laser surface modification [17,18], plasma spraying (APS, LPPS, VPS, AXPS) [19] and pack cementation. Amongst different surface modification routes, the hot dip coating process is an advantageous way because of its being simple, fast and cost effective [20].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and hot corrosion behavior of hot dip siliconized coating on Ni-base superalloy IN738LC

Targhi

Omidvar

Hadavi

et al. 2020

Mater. Res. Express

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Nickel-based superalloys are widely used at elevated temperature applications because of their high corrosion and oxidation resistance characteristics as well as high stability. To improve the hot corrosion resistance of Nickel-based superalloys, different coatings are applied. In this study, nickelbase superalloy Inconel 738LC was coated via a novel hot-dip diffusion siliconizing process and the corrosion behavior was investigated by XRD, SEM and EDS analyses. A sever degradation and poor hot corrosion resistance was detected by the uncoated sample, while the siliconized coated sample possessed high corrosion resistance. It was figured out that the high hot corrosion resistance of the coated sample was due to the formation of SiO 2 protective scale in the surface layer which protects the substrate elements in the hot corrosion environment.

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“…Свойства алюминидов титана можно улучшить путем использования неметаллов (C, В, Si) в качестве добавок, которые благодаря образованию сложных соединений и фаз дисперсного упрочнения повышают их кратковременную и длительную прочность, износоустойчивость и жаростойкость [7 -9]. Так, известно, что твердость покрытий системы Ti-Al-Si выше, чем у Ti-Al покрытия, что связано с формированием силицида Ti 5 Si 3 [7]. Кроме того, наличие кремния повышает высокотемпературное сопротивление окислению покрытий.…”

Section: Introductionunclassified

Preparation and properties of electrospark coatings from Ti3Al granules with silicon carbide and boron carbide additives

et al. 2019

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The composite coatings Ti-Al, Ti-Al-Si-C and Ti-Al-B-C were formed on the Ti 6 Al 4 V titanium alloy by a new method of electro-spark deposition from granules. The granules were produced by sintering powders of titanium and aluminum mixed in a ratio of 3 :1, including 15 wt.% additives of silicon carbide and boron carbide. During coating, the frequency of the discharge pulses was 1 kHz, the on-pulse duration was 0.1 ms, and the deposition time was 12 min. The manufactured electro-spark coatings had a thickness of 20-40 µm. The composition of the surface layer formed by the deposition of pure intermetallic Ti 3 Al coincides with the composition of the initial material of the electrode. The Ti-Al-Si-C coatings are based on TiC, Ti 5 Si 3 and Ti 1+x Al 1-x. The electrospark coatings formed from Ti-Al-B-C granules contain intermetallic compound Ti 3 Al, borides TiB and TiB 2. Among the investigated samples, the Ti 3 Al +15%SiC coating has the highest microhardness, which is approximately 4 times higher than that of the titanium substrate from Ti 6 Al 4 V. The wear intensity of the titanium alloy during dry friction decreases by more than 19 times if it is coated with Ti 3 Al or Ti 3 Al +15%B 4 C coatings. The coating deposited from Ti 3 Al granules with 15 wt.% SiC additive has the highest wear resistance, its rate of deterioration is 38 times lower compared to Ti 6 Al 4 V. The friction coefficient of the obtained composite coatings is equal to 0.38-0.52. The oxidation rate of the titanium alloy during the isothermal heating at a temperature of 900°C can be reduced by 1.9 times if the alloy is coated with Ti 3 Al, and can be reduced by 2.3 times if the alloy is coated with Ti 3 Al with the additions of SiC or B 4 C.

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Microstructure and properties of Ti-Al coating and Ti-Al-Si system coatings on Ti-6Al-4V fabricated by laser surface alloying

Cited by 70 publications

References 12 publications

Micrographic Properties of Composite Coatings Prepared on TA2 Substrate by Hot-Dipping in Al–Si Alloy and Using Micro-Arc Oxidation Technologies (MAO)

Micrographic Properties of Composite Coatings Prepared on TA2 Substrate by Hot-Dipping in Al–Si Alloy and Using Micro-Arc Oxidation Technologies (MAO)

Microstructure and hot corrosion behavior of hot dip siliconized coating on Ni-base superalloy IN738LC

Preparation and properties of electrospark coatings from Ti3Al granules with silicon carbide and boron carbide additives

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