Microstructural characterisation of titanium coatings deposited using cold gas spraying on Al2O3 substrates

Rafaja, David; Schucknecht, T.; Klemm, Volker; Paul, Alexander; Berek, Harry

doi:10.1016/j.surfcoat.2009.03.054

Cited by 43 publications

(32 citation statements)

References 12 publications

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“…A bonded zone recrystallization was showed in [31][32][33]. At the high strain rate impact, features of primary grain disappeared during the interface evolution.…”

Section: Mechanism Of Coating Formation Processmentioning

confidence: 91%

“…Although at the interface, there was a distinct zone occurrence. The study carried out on combining titanium and aluminium as particle and substrate respectively by Rajafa et al [33] revealed another recrystallization phenomenon. The evolution of heat confined during the impact of the deformation zone gave rise to this thermal phenomenon that was activated.…”

Section: Mechanism Of Coating Formation Processmentioning

confidence: 99%

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A comparative review on cold gas dynamic spraying processes and technologies

Oyinbo

Jen

2019

Manufacturing Rev.

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Cold gas dynamic spraying (CGDS) is a relatively new technology of cold spraying techniques that uses converging-diverging (De Laval) nozzle at a supersonic velocity to accelerate different solid powders towards a substrate where it plastically deforms on the substrate. This deformation results in adhesion to the surface. Several materials with viable deposition capability have been processed through cold spraying, including metals, ceramics, composite materials, and polymers, thereby creating a wide range of opportunities towards harnessing various properties. CGDS is one of the innovative cold spraying processes with fast-growing scientific interests and industrial applications in the field of aerospace, automotive and biotechnology, over the past years. Cold gas spraying with a wide range of materials offers corrosion protection and results in increases in mechanical durability and wear resistance. It creates components with different thermal and electrical conductivities than that substrates would yield, or produces coatings on the substrate components as thermal insulators and high fatigue-strength coatings, and for clearance control, restoration and repairing, or prostheses with improved wear, and produces components with attractive appearances. This review extensively exploits the latest developments in the experimental analysis of CGDS processes. Cold gas dynamic spraying system, coating formation and deposit development, description of process parameter and principles, are summarized. Industrial applications and prospectives of CGDS in future research are also commented.

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“…A bonded zone recrystallization was showed in [31][32][33]. At the high strain rate impact, features of primary grain disappeared during the interface evolution.…”

Section: Mechanism Of Coating Formation Processmentioning

confidence: 91%

Section: Mechanism Of Coating Formation Processmentioning

confidence: 99%

A comparative review on cold gas dynamic spraying processes and technologies

Oyinbo

Jen

2019

Manufacturing Rev.

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“…Diese Beobachtung korreliert mit früheren EBSD‐Untersuchungen, die eine starke Kornfeinung der Al‐Partikel in unmittelbarer Nähe der Grenzfläche vermuten ließen , Bild . Die Bildung nanoskaliger Kristallite in Interfacenähe konnte bereits bei Grenzflächenanalysen kaltgasgespritzten Titans auf Al 2 O 3 beobachtet werden . Ursächlich für die einsetzende Rekristallisation sind dabei einerseits die im Material gespeicherte Verformungsenergie und andererseits die lokale Erwärmung im Interfacebereich während des Partikelaufpralls.…”

Section: Ergebnisse Und Diskussionunclassified

Untersuchung der Haftmechanismen kaltgasgespritzter Al-Schichten auf Al₂O₃

Drehmann

Grund

Lampke

et al. 2014

Mat.-wiss. u. Werkstofftech

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The metallization of ceramics by means of cold gas spraying has been in the focus of numerous publications in the recent past. However, the bonding mechanisms of metallic coatings on non-ductile substrates are still not fully understood. Former investigations of titanium coatings on corundum revealed that a combination of recrystallisation induced by adiabatic shear processes and heteroepitaxial growth might be responsible for the high adhesions strengths of coatings applied on smooth ceramic surfaces. In the present work, it is intended to examine the interface area of cold gas sprayed aluminum on alumina substrates. Besides a variation of powder fraction and substrate temperature, it is investigated if a downstream heat treatment has an influence on tensile strength and hardness of the coatings. The splat formation of single particles is investigated by means of scanning electron microscopy, while a high resolution transmission electron microscope is used to examine the Al/Al 2 O 3 interface. First results suggest that mechanical clamping is the primary bonding mechanism on polycrystalline coatings with a sub-micrometer-scaled surface roughness, while heteroepitaxial growth is the main bonding mechanism for Al coatings on single-crystalline, atomically smooth sapphire (α-Al 2 O 3 ) substrates. Heteroepitaxy is promoted by deformation-induced recrystallisation of the cold gas-sprayed aluminum.

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“…Macroscopically, kinetic-sprayed deposits show low porosity and high density with severely deformed and compacted particles (Ref [49][50][51]. Microscopically, the inhomogeneous microstructures are generated between inner and near-interfacial region of deposited particles ( Ref 49,[52][53][54] by an assistance of stored strain-energy-relieving phenomena: grain refinement, dynamic recovery (DRV), dynamic recrystallization (DRX), static recovery (SRV), and static recrystallization (SRX) (Ref 52,(55)(56)(57)(58)(59)(60)(61)(62). Additionally, local phase transformations such as amorphization, crystallization (amorphous alloy), and intermetallic compound creation can occur in the vicinity of the interface (Ref [63][64][65].…”

Section: Introductionmentioning

confidence: 99%

Microstructure of Kinetic Spray Coatings: A Review

2015

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Kinetic spray process has been applied to various industrial fields such as automotive, aviation, and defense industries due to its availability to produce high-performing coating layer. However, since the properties of kinetic-sprayed coating layer are significantly affected by the microstructures of deposit, the microstructures of the deposit should be controlled to acquire advanced coating layer and, accordingly, deep understanding of microstructural evolution must be achieved before controlling the microstructure of the coating layer. This paper gives an overview of contents related to the microstructure of kineticsprayed deposition. The most powerful influencing factors in microstructural evolution of kinetic-sprayed coating layer are instant generation of thermal energy and high-strain, high-strain-rate plastic deformation at the moment of particle impact. A high-density coating layer with low porosity can be produced, although some micro-cracks are occasionally induced at the interparticle boundary or at the inner region of the particles. Also, a microstructure which is distinct from the inner particle region is created in the vicinity of the particle-particle or particle-substrate interface region. However, almost no crystal phase transformation or chemical reaction is induced since the deposited particles are not heated directly by a thermal energy source.

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Microstructural characterisation of titanium coatings deposited using cold gas spraying on Al2O3 substrates

Cited by 43 publications

References 12 publications

A comparative review on cold gas dynamic spraying processes and technologies

A comparative review on cold gas dynamic spraying processes and technologies

Untersuchung der Haftmechanismen kaltgasgespritzter Al-Schichten auf Al₂O₃

Microstructure of Kinetic Spray Coatings: A Review

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Microstructural characterisation of titanium coatings deposited using cold gas spraying on Al2O3 substrates

Cited by 43 publications

References 12 publications

A comparative review on cold gas dynamic spraying processes and technologies

A comparative review on cold gas dynamic spraying processes and technologies

Untersuchung der Haftmechanismen kaltgasgespritzter Al-Schichten auf Al2O3

Microstructure of Kinetic Spray Coatings: A Review

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Untersuchung der Haftmechanismen kaltgasgespritzter Al-Schichten auf Al₂O₃