In-flight measurement of particle size and temperature

Fincke, J. R.; Jeffery, Christopher; Englert, S.B.

doi:10.1088/0022-3735/21/4/005

Cited by 24 publications

(4 citation statements)

References 10 publications

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“…Characterization of the mean particle velocity and size distributions using two powder-injection ports was carried out to analyze the distribution changes with the carrier and plasma gasses. Although many researchers [10][11][12][13] have reported their results using one transverse injector, few of them have ever studied the effects of using two opposite injectors to introduce powders into the plasma jet. As it will be shown later, the mean particle velocity and size distribution using two-port injection exhibit a significant difference from those using only one injector.…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

“…It was well known that the transverse injection of particles comprised of different sizes lead to particle segregation inside the plasma jet [12,13]. Larger particles penetrated further through the plasma jet due to their larger inertia while smaller particles concentrated on the same side of the injector.…”

Section: Radial Distribution Of Particle Mean Velocity and Diameter Fmentioning

confidence: 99%

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Particle velocities, sizes and flux distribution in plasma spray with two powder injection ports

Wang

2004

Materials Science and Engineering: A

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Section: Experimental Setup and Proceduresmentioning

confidence: 99%

Section: Radial Distribution Of Particle Mean Velocity and Diameter Fmentioning

confidence: 99%

Particle velocities, sizes and flux distribution in plasma spray with two powder injection ports

Wang

2004

Materials Science and Engineering: A

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“…This intersection of these two regions forms a localized measurement volume. Recently an in-flight coincidence technique which integrates a particle temperature measure with the measurement of particle size has been demonstrated (13). This technique uses a two-color pyrometric technique to determine temperature and the absolute magnitude of forward scattered laser light to determine particle size.…”

Section: Previous Workmentioning

confidence: 99%

Measurement of Particle Parameters in Thermal Spray Systems

Fincke

Jeffery

Englert

1989

Review of Progress in Quantitative Nondestructive Evaluation

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Particle parameters are important in the optimization of plasma and flame spray processes that involve fine powders. Such processes include plasma and flame spraying, spheroidizing, and chemical processes in which the material is introduced in the form of fine powders or the final product is in the form of a fine powder, e.g. plasma synthesis of ceramics. To fully characterize the particle flow field, it is necessary to measure the particle size, velocity, and number density. In many cases, it is necessary to measure simultaneously several parameters that are strongly coupled such as particle size and temperature, or size and velocity. In this paper we will describe a laser based measurement technique for simultaneously obtaining the in-flight size, velocity, and temperature of small particles entrained in a flow field.

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“…This method of analyzing coating systems was further enhanced with the aid of in situ diagnostic equipment that provided the ability to correlate coating microstructures and properties with in‐flight particle characteristics . These sensors provided important insights into the behavior of in‐flight particles; allowing for more robust modeling and refined control of the static process parameters so that more consistent coatings were manufactured …”

Section: Introductionmentioning

confidence: 99%

Topographical and Microstructural Property Evolution of Air Plasma‐Sprayed Zirconia Thermal Barrier Coatings

2014

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The effects of process parameters on thermal barrier coating (TBC) formation and microstructural properties have been studied. Further understanding of the evolution of properties such as porosity and hardness is an important aspect in the design of efficient TBCs. Plasma-sprayed yttria-stabilized zirconia was coated onto mild steel substrates. The torch was held perpendicular to the substrate to form cone-shaped deposits. Standoff distance (SOD) (80, 90, and 120 mm) and time (15, 30, and 60 s) were altered to investigate the microstructural property relationships of the coatings. Shape characteristics of the coatings were measured via a coordinate measuring machine, and surface roughness measurements were acquired using a 3D optical profiler. The deposition efficiency and coating roughness were affected by SOD and the evolving contour of the underlying surface. Hardness and porosity profiles were mapped to display the effect of process parameters. Dynamic parameters such as particle trajectory, evolving impact angle and dwell time affected changes in porosity, hardness, and density for each coating profile.J. Smialek-contributing editor Manuscript No. 33395.

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In-flight measurement of particle size and temperature

Cited by 24 publications

References 10 publications

Particle velocities, sizes and flux distribution in plasma spray with two powder injection ports

Particle velocities, sizes and flux distribution in plasma spray with two powder injection ports

Measurement of Particle Parameters in Thermal Spray Systems

Topographical and Microstructural Property Evolution of Air Plasma‐Sprayed Zirconia Thermal Barrier Coatings

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