Effects of process parameters on molten particle speed and surface temperature and the properties of HVOF CrC/NiCr coatings

Lih, W.; Yang, Shudong; Su, Chun‐Hsi; Huang, Shu-Chen; Hsu, I-Hsiang; Leu, Ming-Sheng

doi:10.1016/s0257-8972(00)00873-2

Cited by 57 publications

(26 citation statements)

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“…The measured values of porosity were similar in both types of coating. The measured porosity value was in good agreement with earlier studies on HVOF-spray coatings [20][21][22][23] and on D-gun-spray coatings by Rajasekaran et al [24] and Kharlamov [25]. XRD analysis of the Ni-20Cr coating formed by both deposition techniques confirmed the presence of c-Ni as the principal phase.…”

Section: Discussionsupporting

confidence: 90%

Comparative High Temperature Analysis of HVOF-Sprayed and Detonation Gun Sprayed Ni–20Cr Coating in Laboratory and Actual Boiler Environments

Kaushal¹,

Singh

Prakash

2011

Oxid Met

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High-velocity-oxy-fuel (HVOF) spray and detonation-gun (D-gun) spray techniques were used to deposit Ni-20Cr coatings on a commonly used boiler steel ASTM-SAE 213-T22. The specimens, with and without coating, were subjected to molten salt (Na 2 SO 4 -60%V 2 O 5 ) deposition in a laboratory furnace at 900°C to determine hot-corrosion resistance. Specimens were also exposed to the superheater zone of a thermal power plant boiler at an average temperature of 700°C under cyclic conditions to ascertain their erosion-corrosion (E-C) behavior. Mass-change measurements were taken to approximate the kinetics of corrosion and erosion-corrosion. In the case of E-C, the thickness lost data were also taken at the end of the exposure. The exposed specimens were characterized by X-ray diffraction (XRD) and field-emission scanning electron microscopy/energy dispersive spectroscopy (FE-SEM/EDS). The HVOF-sprayed coating was found to be intact during exposure to both given environments; whereas the D-gun coating showed spallation of its oxide scale during exposure to the molten salt environments. An overall analysis of the results indicated that the HVOF-sprayed Ni-20Cr coating should be a better choice for the given boiler applications.

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Section: Discussionsupporting

confidence: 90%

Comparative High Temperature Analysis of HVOF-Sprayed and Detonation Gun Sprayed Ni–20Cr Coating in Laboratory and Actual Boiler Environments

Kaushal¹,

Singh

Prakash

2011

Oxid Met

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“…Consequently, the need arises to employ denser coatings which degrade less due to their more closely packed structure [27]. The porosity of the Cr 3 C 2 -NiCr coatings as reported by authors lies in the range of 1-3.5 % (Table 1), which was found to be useful in developing hot corrosion resistance in boiler tube steel [28,29,30]. The low value of porosity might be due to high kinetic energy of the powder particles.…”

Section: Characterization Of 75cr 3 C 2 -25nicr Coatingsmentioning

confidence: 93%

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

Chatha¹,

Sidhu²,

Sidhu³

2012

JMMCE

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“…The online diagnostic techniques supplemented with other measurement tools have significantly facilitated the development of process maps for HVOF process optimization. These experimental investigations studied the effect of operating parameters including gun type, fuel type, feedstock type and size, combustion pressure, fuel/ oxygen ratio, spray distance on the particle temperature, velocity, melting ratio, oxidant content and the resulting coating microstructure, porosity, hardness, wear abrasion, and corrosion resistance (e.g., Ref 3,28,34,[48][49][50]61,62,65,71,[81][82][83][84][85][86][87][88][89][90][91][92]. The experimental studies have been supplemented by CFD modeling efforts (Ref 10-13, 15-21, 23), which provide fundamental understanding of the gas dynamics, particle in-flight, and impact.…”

Section: Control Of Hvof Thermal Spraymentioning

confidence: 99%

Modeling and Control of High-Velocity Oxygen-Fuel (HVOF) Thermal Spray: A Tutorial Review

Christofides

2009

J Therm Spray Tech

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This work provides a tutorial overview of recent research efforts in modeling and control of the high-velocity oxygen-fuel (HVOF) thermal spray process. Initially, the modeling of the HVOF thermal spray, including combustion, gas dynamics, particle in-flight behavior, and coating microstructure evolution is reviewed. The influence of the process operating conditions as predicted by the fundamental models on particle characteristics and coating microstructure is then discussed and compared with experimental observations. Finally, the issues of measurement and automatic control are discussed and comments on potential future research efforts are made.

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Effects of process parameters on molten particle speed and surface temperature and the properties of HVOF CrC/NiCr coatings

Cited by 57 publications

References 1 publication

Comparative High Temperature Analysis of HVOF-Sprayed and Detonation Gun Sprayed Ni–20Cr Coating in Laboratory and Actual Boiler Environments

Comparative High Temperature Analysis of HVOF-Sprayed and Detonation Gun Sprayed Ni–20Cr Coating in Laboratory and Actual Boiler Environments

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

Modeling and Control of High-Velocity Oxygen-Fuel (HVOF) Thermal Spray: A Tutorial Review

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