Study of metallic powder behavior in very low pressure plasma spraying (VLPPS) — Application to the manufacturing of titanium–aluminum coatings

Vautherin, B.; Planche, Marie-Pierre; Montavon, Ghislain; Lapostolle, Frédéric; Quet, Aurélie; Bianchi, L.

doi:10.1016/j.surfcoat.2015.04.044

Cited by 13 publications

(3 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The current PS-PVD systems are operated with a wide range of plasma arc power from 20 to 180 kW and mixtures of argon and hydrogen or argon and helium [29,30], the secondary gas making it possible to increase the specific enthalpy and thermal conductivity of the plasma gas.…”

Section: Operating Conditionsmentioning

confidence: 99%

Numerical Analysis of the Interactions between Plasma Jet and Powder Particles in PS-PVD Conditions

et al. 2021

View full text Add to dashboard Cite

Plasma spray-physical vapor deposition (PS-PVD) refers to a very low-pressure (~100 Pa) deposition process in which a powder is injected in a high-enthalpy plasma jet, and mostly vaporized and recondensed onto a substrate to form a coating with a specific microstructure (e.g., columnar). A key issue is the selection of the powder particle size that could be evaporated under specific spray conditions. Powder evaporation takes place, first, in the plasma torch between the injection location and nozzle exit and, then, in the deposition chamber from the nozzle exit to the substrate location. This work aims to calculate the size of the particles that can be evaporated in both stages of the process. It deals with an yttria-stabilized zirconia powder and two commercial plasma torches operated at different arc powers with gas mixtures of argon and helium or argon and hydrogen. First, it used computational fluid dynamics simulations to calculate the velocity and temperature fields of the plasma jets under very low-pressure plasma conditions. Then, it estimated the evaporation of the particles injected in both plasma jets assuming an isothermal evaporation process coupled with momentum and heat transfer plasma-particle models in a rarefied plasma. The calculations showed that, for different powers of the Ar–H2 and the Ar–He operating conditions of this study, the heat flux from the plasma jet to particles inside the torch is much higher than that transferred in the deposition chamber while the specific enthalpy transferred to particles is comparable. The argon-helium mixture is more efficient than the argon-hydrogen mixture to evaporate the particles. Particles less than 2 μm in diameter could be fully evaporated in the Ar–He plasma jet while they should be less than 1 µm in diameter in the Ar–H2 plasma jet.

show abstract

Section: Operating Conditionsmentioning

confidence: 99%

Numerical Analysis of the Interactions between Plasma Jet and Powder Particles in PS-PVD Conditions

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The processing parameters such as gas flow, air-fuel ratio, electric arc current and spray distance are the primary factor in determining the coating properties performance concerning the adhesion strength between substrate and coating of these thermal spraying techniques [113,114]. The increment of the flow rate of oxygen enhances the behaviour of the coating composite.…”

Section: High-velocity Suspension Plasma-sprayingmentioning

confidence: 99%

Hydroxyapatite-Based Coating on Biomedical Implant

Harun¹,

Asri²,

Sulong³

et al. 2018

Hydroxyapatite - Advances in Composite Nanomaterials, Biomedical Applications and Its Technological Facets

View full text Add to dashboard Cite

The use of metallic biomaterials for replacement of biomedical implants has been traced back from the nineteenth century. These metallic biomaterials have been declared as clinical success as their mechanical properties that satisfy the prerequisite of the human bone. Nevertheless, critical issues of the materials when they are utilised as implants; including the releasing toxic and harmful metal ions through wear and corrosion processes after longer implantation. Besides that, the bonding strength between bone and implants itself is considered weak due to the diferent components of human bone and metal implants. Hence, developing hydroxyapatite (HAp) coating on metallic biomaterials is expected to overcome the problems faced by biocompatible metallic biomaterials. As far as this, various commercial techniques have been introduced to develop the HAp coating on metallic biomaterials. The techniques are including plasma-spraying method, sol-gel dip-coating, electrochemical deposition and high-velocity suspension plasma-spraying. The formation of HAp coating on metallic biomaterials improved the corrosion resistance together promoting its load-bearing ability and enhanced substrate-coating adhesion.

show abstract

“…Unfortunately, few reports [14,15] are currently available on the effect of plasma spray parameters on aluminium coatings. In these researches, Vautherin et al coated aluminium powder by very low pressure plasma spraying (VLPPS) process and studied the effect of powder size distribution and spray distance on phase composition, microstructure and micro hardness of aluminium plasma spray coatings.…”

Section: Introductionmentioning

confidence: 99%

The investigation of the microstructure behavior of the spray distances and argon gas flow rates effects on the aluminum coating using self-generated atmospheric plasma spray system

2017

View full text Add to dashboard Cite

In the present paper, our aims are the investigation of the effects of the spray parameters of the aluminum-coated layer on the microstructure and mechanical properties. For this purpose, we use the self-generated atmospheric plasma spray system for coating of aluminum on the carbon steel substrate to protect it against corrosion degradation. This system allows us to achieve the best choice for parameters. In this paper, the effects of spray distance and argon flow rate on the characteristics of aluminum coating are investigated. To obtain the results, the analyses are used such as X-ray diffraction, scanning electron microscope, micro hardness of the coating by Vickers method, and adhesion strength behaviors by pulloff test. The results show that the porosity increases with increasing distance. This phenomenon reduces the hardness and adhesion, which is clearly evident in our results. The other important conclusion is that, if the gas flow rate increases, the porosity decreases. It is shown that the best adhesion strength is obtained at the special value of the spraying distance.

show abstract

Study of metallic powder behavior in very low pressure plasma spraying (VLPPS) — Application to the manufacturing of titanium–aluminum coatings

Cited by 13 publications

References 28 publications

Numerical Analysis of the Interactions between Plasma Jet and Powder Particles in PS-PVD Conditions

Numerical Analysis of the Interactions between Plasma Jet and Powder Particles in PS-PVD Conditions

Hydroxyapatite-Based Coating on Biomedical Implant

The investigation of the microstructure behavior of the spray distances and argon gas flow rates effects on the aluminum coating using self-generated atmospheric plasma spray system

Contact Info

Product

Resources

About