Internal Diameter HVAF Spraying for Wear and Corrosion Applications

Lyphout, Christophe; Björklund, Stefan

doi:10.1007/s11666-014-0195-x

Cited by 11 publications

(14 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5.5 lm on an internal surface of a pipe with a 200 mm ID using a newly developed ID HVAF (high velocity air fuel) system produced by UniqueCoat Technologies (Oilville, USA). The resulting coating had a hardness of 900 (HV0.3) and a porosity of approximately 1%, measured by image analysis of SEM images [3]. Although promising, these results show that the mechanical properties of these internally sprayed coatings are inferior to WC-Co-Cr coatings applied externally using current commercial high velocity oxy liquid fuel (HVOLF) spray technologies as these coatings have been shown to have a microhardness of over 1200 HV0.3 [4].…”

Section: Introductionmentioning

confidence: 83%

Effect of Particle and Carbide Grain Sizes on a HVOAF WC-Co-Cr Coating for the Future Application on Internal Surfaces: Microstructure and Wear

et al. 2017

View full text Add to dashboard Cite

The use of nanoscale WC grain or finer feedstock particles is a possible method of improving the performance of WC-Co-Cr coatings. Finer powders are being pursued for the development of coating internal surfaces, as less thermal energy is required to melt the finer powder compared to coarse powders, permitting spraying at smaller standoff distances. Three WC-10Co-4Cr coatings, with two different powder particle sizes and two different carbide grain sizes, were sprayed using a high velocity oxyair fuel (HVOAF) thermal spray system developed by Castolin Eutectic-Monitor Coatings Ltd., UK. Powder and coating microstructures were characterized using XRD and SEM. Fracture toughness and dry sliding wear performance at three loads were investigated using a ball-on-disk tribometer with a WC-Co counterbody. It was found that the finer powder produced the coating with the highest microhardness, but its fracture toughness was reduced due to increased decarburization compared to the other powders. The sprayed nanostructured powder had the lowest microhardness and fracture toughness of all materials tested. Unlubricated sliding wear testing at the lowest load showed the nanostructured coating performed best; however, at the highest load this coating showed the highest specific wear rates with the other two powders performing to a similar, better standard.

show abstract

Section: Introductionmentioning

confidence: 83%

Effect of Particle and Carbide Grain Sizes on a HVOAF WC-Co-Cr Coating for the Future Application on Internal Surfaces: Microstructure and Wear

et al. 2017

View full text Add to dashboard Cite

show abstract

“…The resulting very high particle velocities at impact, in the range of 1000-1200 m/s have been found to produce extremely dense coatings with superior cohesive and adhesive strength [140]. Therefore, HVAF coatings are deemed attractive for corrosion and wear applications and have been investigated for depositing numerous Ni-and Fe-based compositions [141][142][143] as well as carbide-laden coatings [144,145]. Due to these attractive features, HVAF has been increasingly explored as an alternative to the HVOF technology [84].…”

Section: High Velocity Air Fuel (Hvaf)mentioning

confidence: 99%

Coatings for Automotive Gray Cast Iron Brake Discs: A Review

Aranke

Algenaid

Awe³

et al. 2019

Coatings

View full text Add to dashboard Cite

Gray cast iron (GCI) is a popular automotive brake disc material by virtue of its high melting point as well as excellent heat storage and damping capability. GCI is also attractive because of its good castability and machinability, combined with its cost-effectiveness. Although several lightweight alloys have been explored as alternatives in an attempt to achieve weight reduction, their widespread use has been limited by low melting point and high inherent costs. Therefore, GCI is still the preferred material for brake discs due to its robust performance. However, poor corrosion resistance and excessive wear of brake disc material during service continue to be areas of concern, with the latter leading to brake emissions in the form of dust and particulate matter that have adverse effects on human health. With the exhaust emission norms becoming increasingly stringent, it is important to address the problem of brake disc wear without compromising the braking performance of the material. Surface treatment of GCI brake discs in the form of a suitable coating represents a promising solution to this problem. This paper reviews the different coating technologies and materials that have been traditionally used and examines the prospects of some emergent thermal spray technologies, along with the industrial implications of adopting them for brake disc applications.

show abstract

“…HVAF is a thermal spray process designed to produce dense metallic coatings with high bonding strength. In this process, air and fuel gas are injected into the combustion chamber, where an electric spark plug ignites the mixture ( Ref 16,17). This mixture is then expelled through a nozzle, accelerating the feedstock particles to velocities of 1200 m/s.…”

Section: Introductionmentioning

confidence: 99%

Influence of Spray Angle on Microstructure and Lifetime of Suspension Plasma-Sprayed Thermal Barrier Coatings

et al. 2022

View full text Add to dashboard Cite

Thermal barrier coatings (TBCs) are widely utilized in gas turbine engines for power generation. In recent years, the application of TBCs in automotive has been introduced to improve engine efficiency. Low thermal conductivity and high durability are desired coating properties for both gas turbine engines and automotive. Also, suspension plasma spraying (SPS) permits a columnar microstructure that combines both properties. However, it can be challenging to deposit a uniform columnar microstructure on a complex geometry, such as a gas turbine component or piston head, and achieve similar coating characteristics on all surfaces. This work's objective was to investigate the influence of spray angle on the microstructure and lifetime of TBCs produced by SPS. For this purpose, SPS TBCs were deposited on specimens using different spray angles. The microstructures of the coatings were analyzed by image analysis for thickness, porosity, and column density. Thermal and optical properties were evaluated on each TBC. Lifetime tests, specifically designed for the two applications, were performed on all investigated TBCs. The lifetime results were analyzed with respect to the TBC microstructure and thermal and optical properties. This investigation showed that there is a limit to the spray angle that achieves the best compromise between TBC microstructure, thermal properties, optical properties, and lifetime.

show abstract

Internal Diameter HVAF Spraying for Wear and Corrosion Applications

Cited by 11 publications

References 3 publications

Effect of Particle and Carbide Grain Sizes on a HVOAF WC-Co-Cr Coating for the Future Application on Internal Surfaces: Microstructure and Wear

Effect of Particle and Carbide Grain Sizes on a HVOAF WC-Co-Cr Coating for the Future Application on Internal Surfaces: Microstructure and Wear

Coatings for Automotive Gray Cast Iron Brake Discs: A Review

Influence of Spray Angle on Microstructure and Lifetime of Suspension Plasma-Sprayed Thermal Barrier Coatings

Contact Info

Product

Resources

About