Study of the Influence of Particle Velocity on Adhesive Strength of Cold Spray Deposits

Huang, Renzhong; Fukanuma, Hirotaka

doi:10.1007/s11666-011-9707-0

Cited by 98 publications

(50 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The first one is to use helium as the propellant gas for accelerating the alloy particles to sufficiently high velocity (Ref 3,14,15). Because of the high cost of helium, however, it requires a gas recycling facility, which requires a large initial investment.…”

Section: Introductionmentioning

confidence: 99%

Warm Spray Forming of Ti-6Al-4V

et al. 2013

View full text Add to dashboard Cite

Warm spray (WS) is a modification of high-velocity oxy-fuel spraying, in which the temperature of the supersonic gas flow generated by the combustion of kerosene and oxygen is controlled by diluting the combustion flame with an inert gas such as nitrogen. The inert gas is injected into the mixing chamber placed between the combustion chamber and the powder feed ports, thus the temperature of the propellant gas can be controlled from~700 to 2,000 K. Since WS allows for higher particle temperatures in comparison to cold spray, warm sprayed particles are more softened upon impact, thus resulting in greater deformation facilitating the formation of shear instability for bonding. Recently, the combustion pressure of WS has been increased from 1 (low-pressure warm spray) to 4 MPa (high-pressure warm spray) in order to increase the velocity of sprayed particles. Effects of spray parameters on microstructure, mechanical properties, and splats formation of Ti-6Al-4V were systematically studied. Obtained coatings were examined by analyzing the coating cross-section images, microhardness as well as oxygen content. In addition, flattening ratio of splats was calculated as a function of nitrogen flow rate. It was found that the increased particle velocity caused by the increased combustion pressure had significant beneficial effects in terms of improving density and controlling the oxygen level in the sprayed Ti-6Al-4V coatings.

show abstract

Section: Introductionmentioning

confidence: 99%

Warm Spray Forming of Ti-6Al-4V

et al. 2013

View full text Add to dashboard Cite

show abstract

“…In the present study, similar results were obtained near the nozzle, but the particle velocities just before impact were predicted as 120 140, 80100 and 4060 m·s ¹1 for spraying distances of 100, 150 and 200 mm, respectively. Huang and Fukanuma 21) showed that when the particle velocity was over 700 m·s ¹1 , the adhesive strength significantly increased. In contrast, the authors found that a low adhesive strength was obtained in the cold spray process if the velocity of the particles was low.…”

Section: Resultsmentioning

confidence: 99%

“…The authors suggested that a proper coating condition should be applied because the morphological characteristics of the deposited layer may be changed by various factors, including thermal expansion, the powder grain size, and the number of spraying passes. Huang and Fukanuma 21) conducted computational fluid dynamics (CFD) simulations and compared the particle velocity predictions with measured values in order to evaluate the calculation reliability for the DVP-2000 system. Moreover, the researchers suggested that a high particle velocity contributes to a mechanical interlock effect, resulting in excellent bonding between the coating and substrate in the cold spray process.…”

Section: Introductionmentioning

confidence: 99%

Effect of Flame Spray Distance on the Adhesive Characteristics of Ni–20 mass%Cr Layers on SCM415 Substrates

et al. 2012

View full text Add to dashboard Cite

In this work, experimental results on the morphology and adhesive characteristics of flame-sprayed Ni20 mass%Cr coating layers deposited on preheated SCM415 surfaces are presented. The flame spray distance was varied from 100 to 200 mm so as to investigate the change in the adhesive strength of the deposited layers. Commercially available Ni20 mass%Cr particles with a mean diameter of 45 µm were employed in the experiments, and computational fluid dynamics (CFD) simulations using a commercial code (FLUENT) were conducted so as to estimate the temperature and velocity distributions of continuous and discrete phases before impact on the substrate. From FE-SEM images of the deposited layers, it was observed that, as the flame spray distance decreased, the metal particle morphology exhibited a splash-like pattern and a short, stretched shape. Such morphological characteristics were induced by the higher particle momentum associated with very high gas velocities. In addition, as the flame spray distance decreased, the adhesive strength between the deposited layer and the substrate increased due to the stronger momentum of the molten metal particles.

show abstract

“…The inhibiting effect of the interface on crack propagation is related to the surface work hardening of the substrate during cold spraying. During cold spraying, the high velocity metal and ceramic particles impact on the surface of substrate, leading to severe plastic deformation and work hardening of the substrate surface [21][22][23]. This increased hardness was achieved in the substrate near the substrate/coating interface as shown in Fig.3.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

The effect of cold sprayed coatings on the mechanical properties of AZ91D magnesium alloys

Xiong

Zhang

2014

Surface and Coatings Technology

View full text Add to dashboard Cite

Although many previous studies have confirmed that cold sprayed Al+xAl 2 O 3 (x=0-75vol.%) composite coatings on magnesium alloys can effectively improve wear and corrosion resistance, the effect of such coatings on tensile and fatigue properties is still unclear. The present work aims to evaluate the tensile properties and fatigue resistance of an AZ91D alloy with cold sprayed Al+xAl 2 O 3 (x=0, 30, 50vol.%) coatings. The experimental results showed that although the cold spray coating leads to an increase in yield strength and fatigue limit, the tensile strength is reduced. In-situ examination of the macro-morphology of surfaces of the coated specimens during tensile testing was carried out through video recording. It indicated that once the tensile specimens have yielded, horizontal cracks that were perpendicular to the tensile axis formed on the surface of the specimens. Fractographic analysis of the fracture surfaces of the tensile specimens in a scanning electron microscope revealed that all the cracks within the cold sprayed coatings were suspended at the coating/substrate interface. Based on these experimental observations, it is considered that the improved yield strength is attributed to the constraint effect of the cold sprayed composite coatings on the magnesium substrate. The enhanced fatigue limit is a result of the higher yield strength and the coating/substrate interface barrier to crack propagation. The decrease in tensile strength is attributed to the brittle fracture of the cold sprayed coatings when yielding of the specimens.

show abstract

Study of the Influence of Particle Velocity on Adhesive Strength of Cold Spray Deposits

Cited by 98 publications

References 26 publications

Warm Spray Forming of Ti-6Al-4V

Warm Spray Forming of Ti-6Al-4V

Effect of Flame Spray Distance on the Adhesive Characteristics of Ni–20 mass%Cr Layers on SCM415 Substrates

The effect of cold sprayed coatings on the mechanical properties of AZ91D magnesium alloys

Contact Info

Product

Resources

About

Study of the Influence of Particle Velocity on Adhesive Strength of Cold Spray Deposits

Cited by 98 publications

References 26 publications

Warm Spray Forming of Ti-6Al-4V

Warm Spray Forming of Ti-6Al-4V

Effect of Flame Spray Distance on the Adhesive Characteristics of Ni&ndash;20 mass%Cr Layers on SCM415 Substrates

The effect of cold sprayed coatings on the mechanical properties of AZ91D magnesium alloys

Contact Info

Product

Resources

About

Effect of Flame Spray Distance on the Adhesive Characteristics of Ni–20 mass%Cr Layers on SCM415 Substrates