Hot erosion behavior of carbide–metal composite coatings

Wang, Bu Qian; Shui, Zheng

doi:10.1016/s0924-0136(03)00326-1

Cited by 15 publications

(7 citation statements)

References 4 publications

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“…It had a finer structure and smaller splat size than the other three coatings. Further Wang BQ et al [43] carried out series of hot erosion tests on several carbide-metal composite coatings using a nozzle type elevated temperature erosion tester. The coatings included HVOF sprayed Cr 3 C 2 cermet system and WC cermet coatings.…”

Section: Some Studies On Cr 2 C 3 -Nicr Coatingsmentioning

confidence: 99%

Characterisation and Corrosion-Erosion Behaviour of Carbide based Thermal Spray Coatings

Chatha¹,

Sidhu²,

Sidhu³

2012

JMMCE

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Section: Some Studies On Cr 2 C 3 -Nicr Coatingsmentioning

confidence: 99%

Characterisation and Corrosion-Erosion Behaviour of Carbide based Thermal Spray Coatings

Chatha¹,

Sidhu²,

Sidhu³

2012

JMMCE

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“…Among the five Cr 3 C 2 -NiCr blended powders, the one with the widest size distribution presented the least erosion strength. In the microstructure of other blended powder coatings and coatings sprayed from the Cr 3 C 2 cermet, large particles of NiCr metal distributed randomly and coarse sized lamellas, which are related to lower erosion strength, than the coated and sprayed composite, are present ( Figure 37b and 37d) (WANG and SHUI, 2003). Comparing the microstructure of different coatings, these authors observed that the erosion strengths of cermets based on WC and of some Cr 3 C 2 -NiCr coatings are higher.…”

Section: Microstructure Formed During the Deposition Of The Coatingmentioning

confidence: 93%

“…Kulu et al (2005) also observed in practice the influence of the amount of carbides, porosity, as well as the impact angle. Wang and Shui (2003) remark that not only the amount of carbides but also the microstructure formed with the deposition of the cermet influences the erosive wear. So, analyzing the images of the topography of the eroded surface of a NiCrSiB coating sprayed by HVOF and that of WC-17Co also by HVOF at angles ranging from 30 to 90º (Figures 33 and 34, respectively), they concluded that the wear at high impact angles resulted from fracture of carbides or from removal of microparticles due to a low-cycle fatigue process.…”

Section: Fig 31mentioning

confidence: 97%

“…According to Wang and Shui (2003), the size distribution of the powders to be sprayed and the behavior of cermet erosion of the coatings also affect the microstructure formed with the deposition. Investigating three composite coatings based on powder with similar size distribution (16 to 45 μm), these presented higher erosion strength than sprayed coatings from blended powders with greater size distribution (5 to 45 μm or 5 to 80 μm).…”

Section: Microstructure Formed During the Deposition Of The Coatingmentioning

confidence: 99%

“…Figure 38 presents the micrographs (SEM) of samples coated with blended WC-17CoCr and Cr 3 C 2 -NiCr cermet, in which cracking and decrusted morphology are observed, indicating the occurrence of brittle erosion mechanisms (WANG and SHUI, 2003). Figure 38 presents the micrographs (SEM) of samples coated with blended WC-17CoCr and Cr 3 C 2 -NiCr cermet, in which cracking and decrusted morphology are observed, indicating the occurrence of brittle erosion mechanisms (WANG and SHUI, 2003).…”

Section: Microstructure Formed During the Deposition Of The Coatingmentioning

confidence: 99%

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Protection against Erosive Wear Using Thermal Sprayed Cermet

Bergmann

Vicenzi

2011

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PrefaceThe erosion caused by solid particles under extreme conditions (high hardness and velocity of the erodent, cyclic load, and high temperatures) is problematic for industrial equipments. As function of requests, the tension generated in the particles and/or in the target material is, approximately, one order of magnitude greater than its mechanical strength, and as a result, the material can be damaged.Many industries have invested in technology to minimize damage caused by degradation of the materials under erosive wear. In industrial environment, this type of wear occurs when abrasive particles are mixture or carried through pipelines, fans and cyclones, or, in equipments such as mills and mixers, by the inherent displacement of the load. This type of wear was found in mineral processing and separation industries. At high temperatures, for example, these processes take place in the energy-generation industry (thermal plants), in steel and cement production, paper production, and in the petrochemical industry.The erosion at high temperatures leads to the deterioration of parts or components of machines, turbines, engines, and boilers that operate with particulate flows and, as a consequence, shortens their useful lifespan. In the petrol industry, for example, the erosion in boilers powered by powder fuel contributes to approximately 25% of the failures of these equipments, attributed to erosive wear caused by fly ashes.Regarding erosion at high temperatures, several authors mentioned earlier suggest different regimens that contribute to damage of the material under erosion-oxidation, but there is no accordance among the findings by these authors. It is known that different variables in the process of erosive wear can lead to damage of the material by different mechanisms. However, due to the effect of temperature on the material, an oxide is formed, establishing the wear mechanisms. This mechanism result from erosion of the oxide and/or erosion of the composite (formed by oxide and substrate), making the approach for determining the wear phenomenon more complex.The erosion of cermets (bulk and coating), more specifically at high temperatures, has been the subject of many researchers, although few of these studies are conclusive, and even fewer, agree with each other. In the case of cermet coatings, the complex microstructure, due to the lamellar formation can make even more difficult the understanding of the phenomenon responsible for erosion. Besides, as Stack and Pena (1997) noticed, in their studies of an alloy Ni13%Cr with WC particles at temperatures as high as 650 o C, the change in the mechanical properties of the material due to temperature can contribute to increase in the complexity of the behavior of the wear of this kind of material. VI PrefaceThe use of coatings such as cermets have shown excellent results with respect to the high strength against the erosive wear; however, very little is known about the mechanisms that lead to the degradation of this kind of material, at different work tempera...

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