Effects of working gas on wear and corrosion resistances of cold sprayed Ti-6Al-4V coatings

Khun, Nay Win; Tan, Adrian Wei-Yee; Bi, Kexiao; Liu, Erjia

doi:10.1016/j.surfcoat.2016.05.052

Cited by 74 publications

(49 citation statements)

References 46 publications

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“…Besides, the current work also shows that the coating porosity level can be reduced with a small addition of He gas in the N 2 gas. The Ti64 coating sprayed with 20 vol.% addition of He gas to the N 2 gas successfully achieves a lower coating porosity in comparison with other reported works [22,42,[47][48][49]51,[76][77][78]. There are several reasons for the densification of the coatings: (1) the increase in particle velocity provides sufficient impact energy for the particles to deform and seal the pores, and (2) the increase in preheated temperature allows the particles to have more thermal softening.…”

Section: Particle Velocity Analysismentioning

confidence: 79%

“…The particle velocity of Ti64 can be controlled by the type of carrier gas (e.g., air, nitrogen (N 2 ) and helium (He)), gas pressure (20 to 50 bar), gas temperature (500 to 1000 • C), etc. A lighter gas, He or a mixture of N 2 and He, with high gas pressure and a preheated temperature would generate a faster gas stream and provide a higher drag force onto each particle (for acceleration), which results in a more significant particle deformation upon impact and improves coating quality [39][40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Particle Velocity When Propelled Using N2 or N2-He Mixed Gas on the Properties of Cold-Sprayed Ti6Al4V Coatings

et al. 2018

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Cold-spraying is a relatively new low-temperature coating technology which produces coatings by the deposition of metallic micro-particles at supersonic speed onto target substrate surfaces. This technology has the potential to enhance or restore damaged parts made of light metal alloys, such as Ti6Al4V (Ti64). Particle deposition velocity is one of the most crucial parameters for achieving high-quality coatings because it is the main driving force for particle bonding and coating formation. In this work, studies were conducted on the evolution of the properties of cold-sprayed Ti64 coatings deposited on Ti64 substrates with particle velocities ranging from 730 to 855 m/s using pure N2 and N2-He mixture as the propellant gases. It was observed that the increase in particle velocity significantly reduced the porosity level from about 11 to 1.6% due to greater densification. The coatings’ hardness was also improved with increased particle velocity due to the intensified grain refinement within the particles. Interestingly, despite the significant differences in the coating porosities, all the coatings deposited within the velocity range (below and above critical velocity) achieved a high adhesion strength exceeding 60 MPa. The fractography also showed changes in the degree of dimple fractures on the particles across the deposition velocities. Finite element modelling was carried out to understand the deformation behaviour of the impacting particles and the evolutions of strain and temperature in the formed coatings during the spraying process. This work also showed that the N2-He gas mixture was a cost-effective propellant gas (up to 3-times cheaper than pure He) to deliver the high-quality Ti64 coatings.

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Section: Particle Velocity Analysismentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Influence of Particle Velocity When Propelled Using N2 or N2-He Mixed Gas on the Properties of Cold-Sprayed Ti6Al4V Coatings

et al. 2018

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“…The particle impact velocity seems to drastically increase for the light materials (Mg, Al, Ti, and their alloys) and for low process parameters values. Furthermore, for these materials, the particle [27,41,46], (e) Mg and Mg Alloys [66], (f) Ni and Ni Alloys [59][60][61][62][63][64], (g) Ta [21], (h) Ti and Ti Alloys [46][47][48][49][50][51][52][53][54].…”

Section: Resultsmentioning

confidence: 99%

“…Particle velocity vs. process parameter for the different pure metals and alloys analyzed in the present study. (a) Al and Al Alloys[38][39][40][41][42][43][44], (b) Co and Co Alloys[5,49,70], (c) Cu and Cu Alloys[29][30][31][32][33][34][35][36], (d) Fe and Fe Alloys[27,41,46], (e) Mg and Mg Alloys[66], (f) Ni and Ni Alloys[59][60][61][62][63][64], (g) Ta[21], (h) Ti and Ti Alloys[46][47][48][49][50][51][52][53][54].…”

mentioning

confidence: 99%

Powder Properties and Processing Conditions Affecting Cold Spray Deposition

et al. 2020

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The cold spray coating properties and performances are largely affected by feedstock characteristics and the employed processing parameters. Starting from experimental results obtained from the bibliographic data, the relationships between starting particles, processing conditions, and coating properties obtained by cold gas spray were analyzed. The relationships among these properties and particle velocity were described for various material systems. The effect on particle flattening, hardness, and porosity were largely described. Finally, the influence of the different parameters on the process output and on the coating properties was analytically defined through the employment of the multi-objective simulation tool modeFRONTIER. The analysis of data from the bibliography is a new trend that can also be applied to cold spray in order to analyze the effect of powder properties and spraying parameters on the cold spray (CS) process.

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“…However, many metallic materials are very prone to oxidation, many substrate materials cannot tolerate high temperatures, and many thermal sprayed coatings are subject to high thermal stresses and contain high levels of porosities [3][4][5]. Thanks to low temperature input during cold spray process, the cold sprayed coatings are free from phase transition, oxides, inclusions and thermal residual stress [6].…”

Section: Introductionmentioning

confidence: 99%

Tribological and Corrosion Characteristics of Ti6Al4V Coatings Cold Sprayed with Nitrogen and Helium Propellant Gases

Sun¹,

Khun²,

Tan³

et al. 2017

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Abstract. The tribological and corrosion characteristics of Ti6Al4V coatings on Ti6Al4V substrates with nitrogen (N2) and helium (He) propellant gases cold sprayed via a high pressure cold spray process were investigated because different masses of the N2 and He working gases could affect the velocities of Ti6Al4V particles during the cold spraying and consequently the properties of the coatings. The more uniform and denser structure of the Ti6Al4V coatings with a lower porosity level was achieved with He working gas. As a result, the Ti6Al4V coatings deposited with the He working gas had a higher hardness than those deposited with the N2 working gas. The tribological results showed that the use of He gas during the cold spraying produced the more wear resistant Ti6Al4V coatings associated with their higher hardness. The denser Ti6Al4V coatings deposited with the He gas had a lower anodic current density in a NaCl solution than those deposited with the N2 working gas. It is clear that the wear and corrosion resistances of the Ti6Al4V coatings were significantly influenced by the propellant gases during the cold spray deposition.

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Effects of working gas on wear and corrosion resistances of cold sprayed Ti-6Al-4V coatings

Cited by 74 publications

References 46 publications

Influence of Particle Velocity When Propelled Using N2 or N2-He Mixed Gas on the Properties of Cold-Sprayed Ti6Al4V Coatings

Influence of Particle Velocity When Propelled Using N2 or N2-He Mixed Gas on the Properties of Cold-Sprayed Ti6Al4V Coatings

Powder Properties and Processing Conditions Affecting Cold Spray Deposition

Tribological and Corrosion Characteristics of Ti6Al4V Coatings Cold Sprayed with Nitrogen and Helium Propellant Gases

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