Evaluation of Four High Velocity Thermal Spray Guns Using WC-10% Co-4% Cr Cermets

Legoux, Jean-Gabriel; Arsenault, B.; Bouyer, Viviane; Moreau, Christian; Leblanc, L.

doi:10.1361/105996302770349014

Cited by 52 publications

(19 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…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

View full text Add to dashboard Cite

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.

show abstract

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

View full text Add to dashboard Cite

show abstract

“…This is consistent with other microstructural characterizations of thermally sprayed Co-Mo-Cr-Si alloys [15,17]. Such degree of splats oxidation is not usual for HVOFsprayed coatings, where the flame temperature is not particularly high and particles residence time in the gas jet is extremely short [4]; it is particularly unexpected in a coating sprayed with a kerosene-fuelled torch, which injects the powders downstream of the convergingdiverging nozzle, in a position where the gas temperature has already been lowered by the expansion process [24,25]. Besides, coating + substrate temperature was kept to a moderate level during deposition.…”

Section: Microstructural and Micromechanical Characterizationmentioning

confidence: 99%

Tribological properties of HVOF as-sprayed and heat treated Co–Mo–Cr–Si coatings

Bolelli

Lusvarghi

2006

Tribol Lett

View full text Add to dashboard Cite

HVOF-sprayed Co-28%Mo-17%Cr-3%Si alloy tribological performance was tested in the as-sprayed condition and after thermal treatments at 200, 400, 600°C for 1 h. As-sprayed coating possesses low hardness, undergoes adhesive wear against 100Cr6 steel and displays an high-friction coefficient causing relevant thermal effects. The 600°C-heat treatment increases microhardness, thus preventing adhesive wear and reducing friction.

show abstract

“…The gas speed of the HVOF process is higher than any other thermal spraying techniques, resulting in higher particle velocity than those achieved in the conventional flame-spray process. Previous experimental work 1) shows that the higher speed of the particle seems to give higher-quality coatings. Although the HVOF process is widely used as a wear-resistant coating for such things as automotive brake discs and piston rings, the design of the gun has been primarily empirical, and the understanding of gas/particle flow is based on engineering intuition.…”

Section: Introductionmentioning

confidence: 85%

Quasi-One-Dimensional Analysis of the Effects of Pipe Friction, Cooling and Nozzle Geometry on Gas/Particle Flows in HVOF Thermal Spray Gun

Katanoda

2006

Mater. Trans.

View full text Add to dashboard Cite

The High Velocity Oxy-Fuel (HVOF) thermal spraying can make highly tough and dense coatings on a solid surface. It is experimentally recognized that the quality of the coating largely depends on the particle velocity and temperature, which depend on the gas flow in the HVOF gun. The gas flow in the gun is affected by two factors; pipe friction and cooling along the inner wall of the long gun. This paper investigates the gas/particle flow in the HVOF gun by using quasi-one-dimensional analysis including the effects of pipe friction, cooling and nozzle geometry.The standard values of the parameters, to include the effects of pipe friction and cooling are selected based on the experimental result. The nozzle length is varied in the range of 110-330 mm. The calculated results show that (1) the pipe friction decreases the particle velocity and increases the particle temperature, (2) the cooling increases the particle velocity and decreases the particle temperature, (3) the maximum particle velocity is obtained when the length of the diverging part of the nozzle is approximately equal to the length of the following non-diverging straight part, (4) the longer nozzle results in larger particle velocity at the nozzle exit. These numerical results help understand the gasdynamics occurring in the HVOF gun, and assist in the design of the gun.

show abstract

Evaluation of Four High Velocity Thermal Spray Guns Using WC-10% Co-4% Cr Cermets

Cited by 52 publications

References 3 publications

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

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

Tribological properties of HVOF as-sprayed and heat treated Co–Mo–Cr–Si coatings

Quasi-One-Dimensional Analysis of the Effects of Pipe Friction, Cooling and Nozzle Geometry on Gas/Particle Flows in HVOF Thermal Spray Gun

Contact Info

Product

Resources

About