Ir protective coatings for carbon structural materials

Wu, Wangping; Chen, Zhaofeng

doi:10.1007/s11595-012-0522-3

Cited by 4 publications

(3 citation statements)

References 25 publications

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“…Likewise, the closer the value of the softening coefficient to 0, the lower the water resistance of the AFCS. According to current national regulations [53,54], the softening coefficient of the material must not be less than 0.85 for essential buildings that have been in damp or water environments for a long time, and the softening coefficient must not be less than 0.70 for relatively humid or minor buildings. Generally, materials with softening coefficient values >0.85 are considered water-resistant by the engineering community.…”

Section: Water Immersion Testmentioning

confidence: 99%

Experimental Study on the Strength Deterioration and Mechanism of Stabilized River Silt Reinforced with Cement and Alginate Fibers

Wang,

et al. 2024

Materials

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River silt deposited by water in coastal areas is unsuitable for engineering construction. Thus, the in situ stabilization treatment of river silt as the bearing layer has been an important research area in geotechnical engineering. The strength degradation behavior and mechanism of stabilized river silt reinforced with cement and alginate fibers (AFCS) in different engineering environments are crucial for engineering applications. Therefore, freeze–thaw (F–T) cycle tests, wetting-drying (W–D) cycle tests, water immersion tests and seawater erosion tests were conducted to explore the strength attenuation of stabilized river silt reinforced with the same cement content (9% by wet weight) and different fiber contents (0%, 0.3%, 0.6% and 0.9% by weight of wet soil) and fiber lengths (3 mm, 6 mm and 9 mm). The reinforcement and damage mechanism of AFCS was analyzed by scanning electron microscopy (SEM) imaging. The results indicate that the strength of AFCS was improved from 84% to 180% at 15 F–T cycle tests, and the strength of AFCS was improved by 26% and 40% at 30 W–D cycles, which showed better stability and excellent characteristics owing to the hygroscopic characteristics of alginate fiber arousing the release of calcium and magnesium ions within the alginate. Also, the strength attenuation of AFCS was reduced with the increase in the length and content of alginate fibers. Further, the strength of specimens in the freshwater environment was higher than that in the seawater environment at the same fiber content, and the softening coefficient of AFCS in the freshwater environment was above 0.85, indicating that the AFCS had good water stability. The optimal fiber content was found to be 0.6% based on the unconfined compressive strength (UCS) reduction in specimens cured in seawater and a freshwater environment. And the strength of AFCS was improved by about 10% compared with that of cement-stabilized soil (CS) in a seawater environment. A stable spatial network structure inside the soil was formed, in which the reinforcing effect of fibers was affected by mechanical connection, friction and interfacial bonding. However, noticeable cracks developed in the immersed and F–T specimens. These microscopic characteristics contributed to decreased mechanical properties for AFCS. The results of this research provide a reference for the engineering application of AFCS.

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Section: Water Immersion Testmentioning

confidence: 99%

Experimental Study on the Strength Deterioration and Mechanism of Stabilized River Silt Reinforced with Cement and Alginate Fibers

Wang,

et al. 2024

Materials

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“…In previous publications, thermal stability and oxidation resistance of the Ir coating by a double glow plasma process on refractory materials were studied. After high‐temperature treatment at 1400 °C under an inert atmosphere, micropores and microbubbles appeared on the surface of the coating.…”

Section: Introductionmentioning

confidence: 99%

“…After high‐temperature treatment at 1400 °C under an inert atmosphere, micropores and microbubbles appeared on the surface of the coating. After high‐temperature treatment at 2000 °C under an oxyacetylene flame, micropores were still formed on the surface of Ir coating, which could provide pathways for oxygen to attack the substrates. To date, Reed et al have claimed that CVD is the only established process for the fabrication of Ir‐coated Re combustion chambers.…”

Section: Introductionmentioning

confidence: 99%

Micropore formation mechanism in iridium coating after high‐temperature treatment

Chen

2016

Surface & Interface Analysis

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Noble metal iridium is of great interest for high-temperature applications and extreme environments. A high (110)-oriented iridium coating was prepared by a double glow plasma process on the surface of niobium substrate. The morphology and composition of the coating were determined by scanning electron microscopy, energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy, respectively. The phase of the coating was identified by X-ray diffraction analysis. The misorientation angle distributions of grains on the surface and cross section of the coating were characterized by electron backscatter diffraction system. The uniform and pure iridium coating consisted of the submicrometer-sized columnar grains with high-angle boundary. The mean misorientation angles on the surface and cross section of the coating were 38.6°and 45.6°, respectively. After hightemperature treatment, the coating was composed of equiaxed grains with distinct grain boundaries. Micropores appeared on the fracture surface of the coating. The micropore formation mechanism in Ir coating after high-temperature treatment was investigated.

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Electrochemical characteristics of iridium coating by double glow plasma discharge process on titanium alloy substrates

Liu

Zhang

et al. 2019

Surface Engineering

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Ir protective coatings for carbon structural materials

Cited by 4 publications

References 25 publications

Experimental Study on the Strength Deterioration and Mechanism of Stabilized River Silt Reinforced with Cement and Alginate Fibers

Experimental Study on the Strength Deterioration and Mechanism of Stabilized River Silt Reinforced with Cement and Alginate Fibers

Micropore formation mechanism in iridium coating after high‐temperature treatment

Electrochemical characteristics of iridium coating by double glow plasma discharge process on titanium alloy substrates

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