A comparative study on slurry erosion behavior of HVOF sprayed coatings

Reyes-Mojena, Miguel Ángel; Orozco, Mario Sánchez; Fals, Hipólito Carvajal; Zamora, Roberto Sagaró; Lima, Carlos Roberto Camello

doi:10.15446/dyna.v84n202.56542

Cited by 9 publications

(4 citation statements)

References 24 publications

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“…According to Reyes et al, the metallic binder is relatively soft and it is easy to erode it than the hard carbide particles. They suggested that as-sprayed specimens with lower surface roughness and higher microhardness have lower erodent penetration than those with higher surface roughness [42].…”

Section: Sem/eds Analysismentioning

confidence: 99%

Erosion performance of detonation gun deposited WC–12Co, Stellite 6 and Stellite 21 coatings on SAE213-T12 steel

Singh

Mishra

2020

Tribology - Materials, Surfaces & Interfaces

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Thermal spray coatings are used to improve the erosion resistance of boilers and turbine components for power plants and other industries. In this work, detonation gun spraying method is used to deposit WC-12Co, Stellite 6 and Stellite 21 coatings on SAE213-T12 boiler steel. The coatings were characterized using microhardness tester, scanning electron microscope (SEM), optical microscope and X-ray diffractometer (XRD). The solid particle erosion behaviours of the coatings were evaluated at 30°and 90°impact angles using an air jet erosion test rig. The erosion rates of Stellite 6 and Stellite 21 coatings are found approximately 60% and 50% respectively higher than WC-Co coating, which might be attributed to the respective hardness of the coatings. Cobalt content in the coatings played an important role on the erosion behaviour of the coatings. The erosion mechanisms of the coatings involved micro-ploughing, micro-cutting along with some micro-cracking and hard phase pull-outs.

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Section: Sem/eds Analysismentioning

confidence: 99%

Erosion performance of detonation gun deposited WC–12Co, Stellite 6 and Stellite 21 coatings on SAE213-T12 steel

Singh

Mishra

2020

Tribology - Materials, Surfaces & Interfaces

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“…As discussed previously, some unmolten TiC particles were also noted in the coating, which could have contributed to higher surface roughness, suggesting need for further feedstock and process optimization. However, it is also pertinent to mention that the surface roughness of the SPS-processed Cr 3 C 2 coating in this work was lower than that previously reported for HVOF-processed Cr 3 C 2 -based coating [19]. For wear application, it is desirable to produce coatings with low surface roughness.…”

Section: Resultsmentioning

confidence: 73%

Exploiting Suspension Plasma Spraying to Deposit Wear-Resistant Carbide Coatings

et al. 2019

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Titanium- and chromium-based carbides are attractive coating materials to impart wear resistance. Suspension plasma spraying (SPS) is a relatively new thermal spray process which has shown a facile ability to use sub-micron and nano-sized feedstock to deposit high-performance coatings. The specific novelty of this work lies in the processing of fine-sized titanium and chromium carbides (TiC and Cr3C2) in the form of aqueous suspensions to fabricate wear-resistant coatings by SPS. The resulting coatings were characterized by surface morphology, microstructure, phase constitution, and micro-hardness. The abrasive, erosive, and sliding wear performance of the SPS-processed TiC and Cr3C2 coatings was also evaluated. The results amply demonstrate that SPS is a promising route to manufacture superior wear-resistant carbide-based coatings with minimal in situ oxidation during their processing.

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“…However, in conventional Ni-Cr coating, it was observed that there was an increase in weight loss with increase in sand particle size and duration of the test showed good cavitation erosion resistance [20,113]. Nanostructured WC-based and Cr3C2-25NiCr coating showed low erosion-corrosion and erosion-wear compared to conventional coatings corresponding to highest microhardness value, lower porosity, higher fracture toughness, and lower roughness [6,19,21]. The nano carbide ceramic phase mainly causes wear resistance while the corrosion resistance is provided by the binder phase NiCr matrix of the nanostructured Cr3C2-25NiCr cermet coatings [73,83,103].…”

Section: Aisi 1018 Steel Erosion Corrosion Test Potentiodynamic Polarmentioning

confidence: 98%

Nanocrystalline Cermet Coatings for Erosion–Corrosion Protection

et al. 2019

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The processing techniques, microstructural characteristics, and erosion corrosion behaviour of Cr3C2–NiCr and tungsten carbide (WC)-based cermet coatings are reviewed in this work. Conventional and nanocrystalline Cr3C2–NiCr and WC-based cermet coatings are generally synthesized using thermal spray technique. The wear, erosion, and corrosion protection ability of conventional and nanocermet coatings are compared based on available literature. In Cr3C2–NiCr coatings, the corrosion resistance is offered by NiCr metal matrix while the wear resistance is provided by the carbide ceramic phase, making it suitable for erosion–corrosion protection. The nanocrystalline cermet coatings exhibits better erosion–corrosion resistance as compared to the conventional coatings. The nanocrystalline coatings reduces the erosion–corrosion rate significantly compared to conventional coatings. It is attributed to the presence of the protective NiCr metallic binder that allows easier and faster re-passivation when the coating is subjected to wear and the fine-grain structure with homogeneous distribution of the skeleton network of hard carbide phases. In addition, corrosion-accelerated erosion dominates the reaction mechanism of erosion–corrosion and, therefore, higher hardness, strength, and better wear resistance of nanocermet coating along with its faster repassivation kinetics accounts for improved corrosion resistance as compared to conventional coatings.

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A comparative study on slurry erosion behavior of HVOF sprayed coatings

Cited by 9 publications

References 24 publications

Erosion performance of detonation gun deposited WC–12Co, Stellite 6 and Stellite 21 coatings on SAE213-T12 steel

Erosion performance of detonation gun deposited WC–12Co, Stellite 6 and Stellite 21 coatings on SAE213-T12 steel

Exploiting Suspension Plasma Spraying to Deposit Wear-Resistant Carbide Coatings

Nanocrystalline Cermet Coatings for Erosion–Corrosion Protection

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