Publications

Publications on HVAF and HVOF Coatings

You may find here some important publications on HVAF and HVOF coating properties and its influence on corrosion, erosion and cavitation rates.

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I. Hulka et al. Corrosion Behavior of WC-Ni Coatings Deposited by Different Thermal Spraying Methods

This study compares the properties of WC-Ni coatings manufactured from fine powder particles using high velocity oxygen fuel (HVOF) and high-velocity air fuel (HVAF) spraying processes. The results indicated that the decarburisation of carbide phase is influenced by the spraying equipment.

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A. Verstak G. Kusinski High Velocity Air-Fuel spraying and its applications in oil and gas industry

The article written by an HVAF technologist and Chevron engineer describes practical examples of wear and corrosion resistant coating applications: tungsten carbide-based coatings on hydraulics rods of dock cranes, corrosion resistant Ni-Cr-Mo-type coatings on vessels of sulfur removal equipment, tungsten carbide – based coatings on restriction grid plates and slide gates of catalyst towers, high-temperature erosion resistant chromium carbide – based coatings on thermawells and valve stems, wear and cavitation resistant Co-Cr-W-C-type and carbide coatings on housing wear rings and impeller hubs of high-temperature pumps and more.

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Q. Wang et al. Cavitation and Sand Slurry Erosion Resistances of WC-10Co-4Cr Coatings

HVAF-sprayed WC-10Co-4Cr coating exhibited a lower degree of decarburization and better properties in terms of hardness, fracture toughness, porosity, cavitation and sand slurry erosion resistances than those of the HVOF-sprayed WC-10Co-4Cr coatings. Therefore, HVAF-sprayed WC-10Co-4Cr coatings may be better employed for the protection of hydro-turbine component surfaces against cavitation and sand slurry erosion

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T. Zhang et Al. Formation and Properties of Ni-Based Amorphous Metallic Coating Produced by HVAF Thermal Spraying.

A highly dense Ni59Zr20Ti16Si2Sn3 partial amorphous metallic coating, about 500 mm thick, was fabricated by means of HVAF (High Velocity Air Fuel) thermal spraying… It exhibits good corrosion resistance in 0.05 kmol/m3 H2SO4 + 0.05 kmol/m3 Na2SO4 aqueous solution due to low passive current density and wide passive region.

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Q. Wang et al. Wear and corrosion performance of WC-10Co4Cr coatings deposited by different HVOF and HVAF spraying processes.

This study compares three types of WC-10Co4Cr coatings deposited with high-velocity oxygen fuel (HVOF) and high-velocity air fuel (HVAF) spraying processes. The experimental results indicated that the decarburisation of the WC in the WC-10Co4Cr coating was dramatically influenced by the spraying equipment, and the non-WC phase content in the as-sprayed coatings greatly influenced their performances. The HVAF-sprayed WC-10Co-4Cr coating revealed the lowest degree of decarburisation, achieving the best properties in terms of hardness, fracture toughness, abrasive and sliding wear as well as electrochemical corrosion resistance when compared to the two HVOF-sprayed WC-10Co-4Cr coatings.

 

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R.K. Kumar et al. Effect of Spray Particle Velocity on Cavitation Erosion Resistance Characteristics of HVOF and HVAF Processed 86WC-10Co4Cr Hydro Turbine Coatings

The high-velocity air fuel (HVAF) technology, with higher particle velocities and lower spray temperatures, gives dense and substantially non-oxidized coating. In the present study, the cavitation resistance of 86WC-10Co4Cr-type HVOF coating processed at 680 m/s spray particle velocity was compared with HVAF coatings made at 895, 960, and 1010 m/s. The properties such as porosity, hardness, indentation toughness, and cavitation resistance were investigated. The rate of metal loss is low in HVAF coatings implying that process parameters play a vital role in achieving improved cavitation resistance.

Endurance Wear Solutions Llp HVOF and HVAF thermal spray EnduroMax coatings at our spray shop in Mumbai, Maharashtra, India. Call us or send an inquiry to get our best price.

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