Integrated infrared sensor system for on line monitoring of thermally sprayed particles

Blain, J.; Nadeau, F.; Pouliot, Luc; Moreau, Christian; Gougeon, P.; Leblanc, L.

doi:10.1179/sur.1997.13.5.420

Cited by 21 publications

(7 citation statements)

References 4 publications

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“…6,9,10 In addition, there exist commercially available in-flight systems that allow simultaneous measurements of the particle characteristics. 4,13 One of these systems, the Tecnar DPV2000 in-flight diagnostic system (Tecnar Automation, St. Hubert, Quebec, Canada), which combines two-color pyrometry and an L2F system to provide temperature, velocity, particle size, and distribution, has been used by many researchers. 4,7,14 -17 In the current study, the in-flight particle properties such as temperature, velocity, and size of yttria-partially-stabilized zirconia (YSZ) during plasma spraying will be examined to understand the influence of the process parameters on these properties.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of Plasma Spray Parameters on In‐Flight Characteristics of ZrO₂–8 wt% Y₂O₃ Ceramic Particles

Küçük

Lima

Berndt

2001

Journal of the American Ceramic Society

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Yttria-partially-stabilized zirconia was atmospherically plasma sprayed by systematically varying the process conditions including carrier gas flow rate, torch power, standoff distance, and Ar/H 2 ratio in the plasma gas mixture. The in-flight particle parameters such as temperature, velocity, number, and size were determined using a commercially available diagnostic system. The particle parameters were controlled by the particle trajectory in the plume and plasma jet characteristics. The average temperature and the velocity of particles, which reached their maximum at an intermediate carrier gas flow rate of 3.5 L/min, varied as much as 6% and 25%, respectively, with a 75% variation in the carrier gas flow rate by going from the lowest to the intermediate rates. The average temperature and the velocity of particles were lower for a lower torch power, a higher Ar/H 2 ratio, and a larger standoff distance. It was necessary to obtain data on particle populations larger than 1000 for statistically reliable and reproducible information from the diagnostic system.

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Section: Introductionmentioning

confidence: 99%

“…It was necessary to obtain data on particle populations larger than 1000 for statistically reliable and reproducible information from the diagnostic system. Journal of the American Ceramic No. 4 ‡ Metco 204NS is a hollow spherical YSZ powder with a density of 4 g/cm 3 while the alumina powder also has a density of around 4.0 g/cm 3 .…”

mentioning

confidence: 99%

Influence of Plasma Spray Parameters on In‐Flight Characteristics of ZrO₂–8 wt% Y₂O₃ Ceramic Particles

Küçük

Lima

Berndt

2001

Journal of the American Ceramic Society

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“…The DPV-2000 system has been described in detail in previous papers [14,21]. The thermal radiation collected by the sensor head is transmitted to the detection cabinet by an optical fiber.…”

Section: Monitoring Of Individual In-flight Particlesmentioning

confidence: 99%

Diagnostics for advanced materials processing by plasma spraying

Moreau

Bisson

Lima

et al. 2005

Pure and Applied Chemistry

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Advanced coatings deposited by plasma spraying are used in a large variety of industrial applications. The sprayed coatings are employed typically in industry to protect parts from severe operating conditions or to produce surfaces with specific functions. Applications are found in many industrial sectors such as aerospace, automobile, energy generation, and biomedical implants.Coatings are built by the successive deposition of molten or partially molten particles that flatten and solidify upon contact on the substrate, forming lamellae. The coating properties are intimately linked to the properties of these lamellae, which in turn depend on inflight particle properties as well as substrate temperature during spraying. Consequently, the development of diagnostic tools for monitoring and controlling these spray parameters will help provide the necessary information to study the coating formation process, optimize the coating properties, and, eventually, control the spray process in production.In this paper, a review of some recent developments of optical diagnostic techniques applied to monitor plasma-sprayed particles is presented. In the first part of the paper, two different sensing techniques for in-flight particle measurement are described. First, time-resolved diagnostics on individual particles is described. This technique is used to study the instabilities of the particle characteristics associated with the plasma fluctuations. Secondly, a technique adapted for use in an industrial production environment for measuring the particle jet characteristics as an ensemble is presented. In the second part of the paper, the use of an optical system to study the influence of the substrate temperature on the flattening and solidification of sprayed particles impacting on a flat substrate is described. The last part of this paper describes the optimization of nanostructured coatings based on a tight control of the temperature and velocity of the plasma-sprayed particles.

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“…Porosity and microhardness are two of the basic and key factors to characterize the microstructure and properties of thermal spray coatings. Recently, some online particle monitoring systems (DPV2000) have been developed to measure the temperature and velocity of in-flight particles and to correlate them with the coating quality ( Ref 4,5). In thermal spray, the deposit is built up by successive impacts of molten droplets.…”

Section: Introductionmentioning

confidence: 99%

Comparison of In-Flight Particle Properties, Splat Formation, and Coating Microstructure for Regular and Nano-YSZ Powders

et al. 2009

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The relationship between atmospheric pressure plasma spray parameters and in-flight particle characteristics was determined. The morphologies of individual splats and the coating microstructure were studied for different stand-off distances and arc currents. Coating cross-sectional analysis showed that the total porosity of the coating increased with decreasing arc current, and increasing stand-off distance. Two different materials were used: the regular (r-YSZ) feed stock and the nano size (n-YSZ) agglomerated powder. The results illustrate that the r-YSZ coating has higher total porosity at higher arc currents than n-YSZ coating. The splat flattening degree and circularity was examined at different substrate temperatures for both powders. The results indicate that the flattening degree increased at high temperatures for the two materials, but the values for n-YSZ were higher than those for the r-YSZ. This study showed the operating regimes in which the use of n-YSZ yields improved coating properties.

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Integrated infrared sensor system for on line monitoring of thermally sprayed particles

Cited by 21 publications

References 4 publications

Influence of Plasma Spray Parameters on In‐Flight Characteristics of ZrO₂–8 wt% Y₂O₃ Ceramic Particles

Influence of Plasma Spray Parameters on In‐Flight Characteristics of ZrO₂–8 wt% Y₂O₃ Ceramic Particles

Diagnostics for advanced materials processing by plasma spraying

Comparison of In-Flight Particle Properties, Splat Formation, and Coating Microstructure for Regular and Nano-YSZ Powders

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Integrated infrared sensor system for on line monitoring of thermally sprayed particles

Cited by 21 publications

References 4 publications

Influence of Plasma Spray Parameters on In‐Flight Characteristics of ZrO2–8 wt% Y2O3 Ceramic Particles

Influence of Plasma Spray Parameters on In‐Flight Characteristics of ZrO2–8 wt% Y2O3 Ceramic Particles

Diagnostics for advanced materials processing by plasma spraying

Comparison of In-Flight Particle Properties, Splat Formation, and Coating Microstructure for Regular and Nano-YSZ Powders

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Influence of Plasma Spray Parameters on In‐Flight Characteristics of ZrO₂–8 wt% Y₂O₃ Ceramic Particles

Influence of Plasma Spray Parameters on In‐Flight Characteristics of ZrO₂–8 wt% Y₂O₃ Ceramic Particles