Nanostructured and Conventional Cr2O3, TiO2, and TiO2-Cr2O3 Thermal-Sprayed Coatings for Metal-Seated Ball Valve Applications in Hydrometallurgy

Vernhes, L.; Bekins, Craig; Lourdel, Nicolas; Poirier, Dominique; Lima, Rogerio S.; Li, Duanjie; Klemberg-Sapieha, Jolanta E.

doi:10.1007/s11666-016-0405-9

Cited by 16 publications

(7 citation statements)

References 8 publications

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“…The E g gradually decreased from 2.68 eV at 3wt% to 2.55eV at 9wt% of TiO 2 . An obvious strong longer wavelength shift was observed for higher 3,5,7and 9wt% of Cr 2 O 3 :TiO 2 films when compared with the bulk system ~3eV (15). The variation of E g and crystallite size with respect to various concentrations ratio of TiO 2 in Cr 2 O 3 system.…”

Section: Figure 5 Optical Energy Gap For Cr 2 O 3 Thin Films At Different Ratio Tiomentioning

confidence: 88%

Cr2O3:TiO2 Nanostructure Thin Film Prepared by Pulsed Laser Deposition Technique as NO2 Gas Sensor

Kareem¹

2020

Baghdad Sci.J

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Pulsed laser deposition (PLD) technique was applied to prepared Chromium oxide (Cr2O3) nanostructure doped with Titanium oxide (TiO2) thin films at different concentration ratios 3,5,7 and 9 wt % of TiO2. The effect of TiO2 dopant on the average size of crystallite of the synthesized nanostructures was examined by X-ray diffraction. The morphological properties were discussed using atomic force microscopy(AFM). Observed optical band gap value ranged from 2.68 eV to 2.55 eV by ultraviolet visible(UV-Vis.) absorption spectroscopy with longer wave length shifted in comparison with that of the bulk Cr2O3 ~3eV. This indicated that the synthesized samples are attributed to the enhancement of the quantum conﬁnement effect. Gas response sensitivity, and recovery times of the sensor in the presence of NO2 gas were studied and discussed. In this work it is found that, the sensitivity increases when doping ratio increases from 3wt% to 5wt% of TiO2 and return to decrease over that. The optimum concentrations ratio for NO2 gas sensitivity is 5wt% of TiO2 and sensitivity is 168.75% at 200oC.

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Section: Figure 5 Optical Energy Gap For Cr 2 O 3 Thin Films At Different Ratio Tiomentioning

confidence: 88%

Cr2O3:TiO2 Nanostructure Thin Film Prepared by Pulsed Laser Deposition Technique as NO2 Gas Sensor

Kareem¹

2020

Baghdad Sci.J

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“…The latter case is the simplest one, and blended powders have a high importance in the current industrial practice of thermal spraying. This is valid for commercially available blends in the Al 2 O 3 -TiO 2 system, such as Al 2 O 3 -40%TiO 2 and Al 2 O 3 -13%TiO 2 [18,19], but also for blending at the production site [20]. In general, an interaction between components of the blends will occur only during the spray process and is, in general, expected to be low due to the large particle size.…”

Section: Introductionmentioning

confidence: 85%

Microstructure and Sliding Wear Resistance of Plasma Sprayed Al2O3-Cr2O3-TiO2 Ternary Coatings from Blends of Single Oxides

et al. 2020

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Al2O3, Cr2O3, and TiO2 are most commonly used oxide materials for thermal spray coating solutions. Each oxide shows unique properties comprising behavior in the spray process, hardness, corrosion, and wear resistance. In order to exploit the different advantages, binary compositions are often used, while ternary compositions are not studied yet. Atmospheric plasma spraying (APS) of ternary compositions in the Al2O3-Cr2O3-TiO2 system was studied using blends of plain powders with different ratios and identical spray parameters. Coatings from the plain oxides were studied for comparison. For these powder blends, different deposition rates were observed. The microstructure, roughness, porosity, hardness, and wear resistance were investigated. The formation of the splats from particles of each oxide occurs separately, without interaction between the particles. The exception are the chromium oxide splats, which contained some amounts of titanium. The predominant oxide present in each blend has a decisive influence on the properties of the coatings. While TiOx causes a low coating porosity, the wear resistance can be increased by adding Cr2O3.

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“…An implementation of TS ceramic coatings to improve compression resistance has been reported for metal seated ball valve applications [ 112 , 113 , 114 ]. These ceramic coatings have improved the load carrying capacity and tribological performance of the base material, leading to extended service life of hydrometallurgy components.…”

Section: Growth Opportunities For Thermal Spray In the Iron And Steel...mentioning

confidence: 99%

“…These ceramic coatings have improved the load carrying capacity and tribological performance of the base material, leading to extended service life of hydrometallurgy components. In this regard, Vernhes et al [ 113 ] developed nanostructured Cr 2 O 3 , n -TiO 2 , and n -TiO 2 -Cr 2 O 3 TS coatings for metal seated ball valve applications using HVOF spraying and tested the performance of each material’s coating. The results indicated that n -TiO 2 -Cr 2 O 3 coating showed best overall tribological performance compared Cr 2 O 3 and n -TiO 2 coatings.…”

Section: Growth Opportunities For Thermal Spray In the Iron And Steel...mentioning

confidence: 99%

Applications and Developments of Thermal Spray Coatings for the Iron and Steel Industry

et al. 2023

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The steel making processes involves extreme and harsh operating conditions; hence, the production hardware is exposed to degradation mechanisms under high temperature oxidation, erosion, wear, impact, and corrosive environments. These adverse factors affect the product quality and efficiency of the steel making industry, which contributes to production downtime and maintenance costs. Thermal spray technologies that circumvent surface degradation mechanisms are also attractive for their environmental safety, effectiveness and ease of use. The need of thermal spray coatings and advancement in terms of materials and spray processes are reviewed in this article. Application and development of thermal spray coatings for steel making hardware from the molten metal processing stages such as electric arc and basic oxygen furnaces, through to continuous casting, annealing, and the galvanizing line; to the final shaping process such as cold and hot rolling of the steel strips are highlighted. Specifically, thermal spray feedstock materials and processes that have potential to replace hazardous hard chrome plating are discussed. It is projected that novel coating solutions will be incorporated as awareness and acceptance of thermal spray technology grows in the steel making sectors, which will improve the productivity of the industry.

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Nanostructured and Conventional Cr2O3, TiO2, and TiO2-Cr2O3 Thermal-Sprayed Coatings for Metal-Seated Ball Valve Applications in Hydrometallurgy

Cited by 16 publications

References 8 publications

Cr2O3:TiO2 Nanostructure Thin Film Prepared by Pulsed Laser Deposition Technique as NO2 Gas Sensor

Cr2O3:TiO2 Nanostructure Thin Film Prepared by Pulsed Laser Deposition Technique as NO2 Gas Sensor

Microstructure and Sliding Wear Resistance of Plasma Sprayed Al2O3-Cr2O3-TiO2 Ternary Coatings from Blends of Single Oxides

Applications and Developments of Thermal Spray Coatings for the Iron and Steel Industry

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