Asymmetrical bonding in cold spraying of dissimilar materials

Nikbakht, Roghayeh; Seyedein, S.H.; Kheirandish, Shahram; Assadi, H.; Jodoin, B.

doi:10.1016/j.apsusc.2018.03.103

Cited by 43 publications

(15 citation statements)

References 64 publications

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“…This implies that Ni is the dominant diffuser, in accordance with the literature on interdiffusion of Ni - Ti system (Ref 47 ). A close look at Ni/Ti splat interfaces shows that thin intermetallics did not form continuously at the whole interface area and that they all present various thicknesses, suggesting a role of localized deformation and bonding in the kinetics of intermetallic phase nucleation at Ni/Ti interface (Ref 33 ). Similarly to what was observed for the annealing temperature of 400°C, Ni splats exhibit very fine grains at the splat boundaries.…”

Section: Resultsmentioning

confidence: 99%

Intermetallic Phase Evolution of Cold-Sprayed Ni-Ti Composite Coatings: Influence of As-Sprayed Chemical Composition

2020

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Owing to low-temperature deposition conditions and high deposition rate, cold spray offers unique advantages in manufacturing a wide variety of metallic and composite coatings including metal matrix composites produced from physically blended powders. One of the challenges of producing composite coatings using cold spray is the deviation of coatings composition from the blended feedstock powder composition. This is of utmost importance as it affects the composition and phase evolution of intermetallic forming coatings during post spray heat treatment. In this work, cold spray of composite Ni - Ti coatings and formation of intermetallics from post spray heat treatment were investigated as a first step to examine the potential of producing equiatomic bulk Ni - Ti by cold spray. Three different physically blended Ni and Ti powders mixtures were sprayed on titanium substrates to address the coating composition variation from the blended feedstock powder and study its influence on phase evolution during post spray heat treatment. High-density and well-dispersed composite coatings were achieved for each case. EDS analysis revealed as-sprayed coatings with 10.5, 35.9 and 56.9 at.% Ni (and with balanced Ti ratios) from the three powder mixtures. Annealing treatments were conducted at 400, 500 and 900 °C for 1 and 2 h and comparative studies of the intermetallic compound formations were carried out. Microstructural investigation showed that all three equilibrium intermetallics phases of binary Ni - Ti phase diagram (Ni 3 Ti, Ti 2 Ni and NiTi) formed in the two Ni-rich composite coatings with NiTi phase being maximum in the coating with the closest composition to equiatomic ratio while only Ti 2 Ni phase formed in the Ti-rich coating after annealing. Thermal etching analysis of coatings showed that NiTi phase forms with a gradient microstructure from Ti splats boundary toward the center of splats, which is attributed to the grain refinement of CS samples at splat boundary and intermetallic nucleation mechanism.

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Section: Resultsmentioning

confidence: 99%

Intermetallic Phase Evolution of Cold-Sprayed Ni-Ti Composite Coatings: Influence of As-Sprayed Chemical Composition

2020

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“…There are quite a few mechanisms of bonding proposed in the literature [29,50] some of which are under debate. Some of these debates include whether or not adiabatic shear instability is required for bonding [51,52], the roles of jetting-outward ejection of material from the particle-substrate interface, native surface oxide layer [29,53], interfacial melting [54][55][56], and interface solid-state amorphization [57,58]; these mechanisms will be examined in details in the latter section.…”

Section: Mechanisms Of Bonding and Objective Of The Studymentioning

confidence: 99%

Recent advances on bonding mechanism in cold spray process: A review of single-particle impact methods

Adaan-Nyiak

Tiamiyu

2022

Journal of Materials Research

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Cold spray (CS) processing is a layer-by-layer solid-state deposition process in which particles at a temperature below their melting point are launched to sufficiently high velocities to adhere to a substrate (and previously deposited particles), forming coatings/parts. Despite being in existence for over four decades, particle bonding mechanisms in the CS process are unclear due to the complex particle–particle/carrier gas interactions that obscure assessment. This review evaluates recent findings from single-particle impact approaches that circumvent these complexities and further provide new insights on bonding mechanisms. Theories on the evolution of oxide layer breakup and delamination, adiabatic shear instability, jetting, melting, and interface solid-state amorphization that contributes to bonding are assessed and carefully reviewed. Although there is a unified condition in which bonding sets on, this study shows that no singular theory explains bonding mechanism. Rather, dominant mechanism is a function of the prevailing barriers unique to each impact scenario. Graphical abstract

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“…In contrast, for metallic material the general form of interface bonding can be characterized by the contact area, time, temperature and recoverable resilience, conducted with distinct conditions of adiabatic shear instability. Nikbakht et al (2018) studied the asymmetrical bonding in cold gas dynamic spraying of two dissimilar materials (Ni and Ti). Experimental results showed that with the increase in impact velocity, the bonding enhance from the circumference to the center of the interfaces.…”

Section: Bonding Mechanism In Cold Spraymentioning

confidence: 99%

Overview of cold spray coatings applications and comparisons: a critical review

Kumar¹,

Kumar

Jindal

2020

WJE

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Purpose This paper aims to consolidate the results of various researchers focusing the different applications, so that this paper could become the torch bearer for the futuristic researchers working in the domain of cold gas dynamics spray coating. Design/methodology/approach A study on the cold spray coating is presented by summarizing the data present in literature. Important factors such as coating temperature, pressure, coating thickness, particle size, which affect the erosion-corrosion (E-C) resistance, physical and mechanical properties of boiler steel are stated. This paper also addresses the use of cold spray coating and compares it with other different thermal spray processes. Findings From the literature review, it was noticed that cold spray technology is best as compare to other thermal spray processes to reduce porosity, increase hardness, adhesion strength and retention in properties of feedstock powders. Originality/value Cold spray coating technology has a great potential in almost every field especially in restoration of surfaces, generation of complex surface, biomedical application, resist hot corrosion, wear, oxidation and erosion corrosion.

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Asymmetrical bonding in cold spraying of dissimilar materials

Cited by 43 publications

References 64 publications

Intermetallic Phase Evolution of Cold-Sprayed Ni-Ti Composite Coatings: Influence of As-Sprayed Chemical Composition

Intermetallic Phase Evolution of Cold-Sprayed Ni-Ti Composite Coatings: Influence of As-Sprayed Chemical Composition

Recent advances on bonding mechanism in cold spray process: A review of single-particle impact methods

Overview of cold spray coatings applications and comparisons: a critical review

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