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deposition efficiency

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Published: 01 June 2016
Fig. 1.10 Early Russian experimental results show that deposition efficiency increases dramatically above a given velocity and that this critical velocity varies for different materials. For example, in this plot the critical velocity for aluminum is higher than that for nickel or copper More
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Published: 01 June 2016
Fig. 2.2 Schematic of the mass change respective to the deposition efficiency with particle impact velocity, illustrating the concept of critical velocity. v crit denotes the velocity above which deposition takes place; v erosion marks the transition to hydrodynamic effects that cause More
Image
Published: 01 June 2016
Fig. 2.14 (a) Individual deposition efficiencies (DE) and (b) hard-phase contents in the powders and the coatings for cold spraying copper-tungsten blends of similar particle-size cuts. Cold spraying was performed with nitrogen at a process gas pressure of 4 MPa (580 psi) and a process gas More
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Published: 01 June 2016
Fig. 2.19 Attainable (a) deposition efficiencies (DE) and (b) tubular coating tensile (TCT) strengths for cold spraying copper in different powder size cuts as a function of the particle velocity excess with respect to critical velocity. Source: Ref 2.34 More
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Published: 01 June 2016
Fig. 3.24 Impact and critical velocities as a function of particle diameter calculated for two different process conditions in cold spraying of copper. Note that typical particle size ranges and deposition efficiencies are different for the two cases. DE, deposition efficiency. Source: Ref More
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Published: 01 June 2016
deposition efficiency of 70%. More
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Published: 01 June 2016
steel. The insets in the micrographs indicate the average surface roughness measurement. (c) Roughness versus deposition efficiency (DE) of a cold-sprayed titanium coating. (d) Microhardness versus roughness for a titanium coating. Source: Ref 5.33 , 5.81 More
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Published: 01 June 2016
at a process gas pressure of 4 MPa (580 psi) and a process gas temperature of 900 °C (1650 °F). If hard-phase particles are much smaller than the ductile particles, here given in sizes of 16 to 38 μm, the deposition efficiency decreases from 50% to approximately 20%, because only a small amount of the hard More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2022
DOI: 10.31399/asm.tb.tstap.t56040020
EISBN: 978-1-62708-428-4
... and numerical simulations to understand liquid feedstock / high-energy gas interactions. Experimental observations and numerical simulations to understand the mechanisms of coating formation. Increase in stand-off distance. Increase in deposition efficiency and deposition rate. Development of sensors...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.tb.hpcspa.t54460017
EISBN: 978-1-62708-285-3
.... At velocities above the erosion velocity ( v erosion ), material is removed from the substrate by hydrodynamic effects. Fig. 2.2 Schematic of the mass change respective to the deposition efficiency with particle impact velocity, illustrating the concept of critical velocity. v crit denotes...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.tb.hpcspa.t54460001
EISBN: 978-1-62708-285-3
... ). The deposition efficiency (i.e., the mass of material actually deposited as compared to the mass of material sprayed onto the surface) increases dramatically as the average particle velocity moves beyond V crit . The critical velocity varies significantly for different materials, and other factors...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.tb.hpcspa.t54460173
EISBN: 978-1-62708-285-3
... resulted in both improved deposition efficiency and higher coating density ( Ref 6.1 ). Particle size distribution affects the cold spray process the most. On one hand, a high content of very fine powders below 5 to 10 μm decreases the deposition efficiency (DE), increases the coating porosity...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.tb.hpcspa.t54460185
EISBN: 978-1-62708-285-3
... . Bonding is due primarily to surface film rupture and adiabatic shear, not to mechanical interlocking. The ability to deposit a wide variety of metals/alloys and some cermets: These can be deposited on a variety of substrates, both metallic and nonmetallic. Very high deposition efficiencies...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 1997
DOI: 10.31399/asm.tb.wip.t65930365
EISBN: 978-1-62708-359-1
... steels down to 18 gage. Joint preparation is required on thicknesses over 3.2 mm ( 1 8 in.). Unlimited upper thickness but other processes (GMAW, FCAW, or SAW) are usually more economical. A low-deposition-rate process (up to 9 kg/h, or 20 lb/h) with low deposit efficiency (typically 65...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 1997
DOI: 10.31399/asm.tb.wip.9781627083591
EISBN: 978-1-62708-359-1
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.tb.hpcspa.t54460067
EISBN: 978-1-62708-285-3
..., for example, to investigate the effect of various material properties and process parameters on the deposition efficiency and on the final properties of cold-sprayed deposits ( Ref 3.5 , 3.7 , 3.8 ). Apart from the main factors listed in Table 3.1 , numerical investigations can be used to study...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2006
DOI: 10.31399/asm.tb.cw.t51820013
EISBN: 978-1-62708-339-3
... (sensitivity to porosity or cracking and the required mechanical properties), but also the details of the joint (plate thickness, joint design, welding position, and location) and weld economics (deposition rates and efficiencies, cost of labor, cost of consumables, capital cost of equipment, number of spare...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230361
EISBN: 978-1-62708-298-3
... mm (0.2 in.) along the center of the deposits to approximately 1.3 mm (0.05 in.) along the edges. The weight of a deposit ranged from approximately 400 to 500 g (14 to 18 oz) following a condensation rate of approximately 6 g/min (0.21 oz/min) with a collection efficiency of approximately 55...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.tb.hpcspa.t54460121
EISBN: 978-1-62708-285-3
... parameters, such as spray angle, standoff distance, raster speed, deposition efficiency, and powder feed rate, is to use the optical microscope. Practically all the reports on cold spray coatings will start with this characterization, which is fundamental to assessing the coating quality. In most cases...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2022
DOI: 10.31399/asm.tb.tstap.t56040010
EISBN: 978-1-62708-428-4
... is all that is required to adapt the gun to different alloys, wire sizes, or gases. For all practical purposes, the rod and wire guns are similar. The flame spray process is characterized by low capital investment, high deposition rates and efficiencies, low cost of equipment maintenance...