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ITSC 2022, Thermal Spray 2022: Proceedings from the International Thermal Spray Conference, 395-412, May 4–6, 2022,
... Abstract In a DC plasma spray torch, the plasma-forming gas is the most intensively heated and accelerated at the cathode arc attachment due to the very high electric current density at this location. A proper prediction of the cathode arc attachment is, therefore, essential for understanding...
Proceedings Papers

ITSC 2022, Thermal Spray 2022: Proceedings from the International Thermal Spray Conference, 856-867, May 4–6, 2022,
... Abstract The process properties for DC plasma spraying are affected by the arc as the source of energy for plasma generation. For instance, the position of the anode attachment point, the arc movement and the arc formation are significantly influencing process stability, reproducibility...
Proceedings Papers

ITSC 2021, Thermal Spray 2021: Proceedings from the International Thermal Spray Conference, 360-371, May 24–28, 2021,
... Abstract Anode erosion is a common concern in dc plasma spray torches. It depends largely on the heat flux brought by the arc and the dimensions, residence time, and mode of the arc attachment to a given location on the anode wall. This paper compares anode arc attachment modes predicted by LTE...
Proceedings Papers

ITSC 2019, Thermal Spray 2019: Proceedings from the International Thermal Spray Conference, 59-64, May 26–29, 2019,
... Abstract Two common concerns in dc plasma torches are stability of plasma jet and anode erosion. The challenge is how to get a stable plasma jet with minimal anode erosion. This study tackles this question by using an external axial magnetic field applied to a cascaded plasma torch. A 3D, time...
Proceedings Papers

ITSC 2019, Thermal Spray 2019: Proceedings from the International Thermal Spray Conference, 727-733, May 26–29, 2019,
... Abstract In this work, numerical models are developed and used to simulate magneto-hydrodynamic fields inside a dc plasma torch during suspension plasma spraying and their influence on arc attachment. A Reynolds stress model is used to simulate turbulent plasma flow and a discrete phase model...
Proceedings Papers

ITSC 2018, Thermal Spray 2018: Proceedings from the International Thermal Spray Conference, 515-520, May 7–10, 2018,
... to directly spray fine ceramic particles with a newly developed low power dc plasma torch. Preliminary results obtained with this system will be compared with those by other fine powder spray technology such as suspension plasma spray and hybrid aerosol deposition to show similarity and difference when...
Proceedings Papers

ITSC 2018, Thermal Spray 2018: Proceedings from the International Thermal Spray Conference, 690-696, May 7–10, 2018,
... Abstract Due to the growing application fields, the development of plasma generators has become increasingly important in recent years. Nowadays, DC-plasmas used for a plethora of coatings on metallic surfaces, metallization of plastic materials, surface cleaning and activation, plasma welding...
Proceedings Papers

ITSC 2018, Thermal Spray 2018: Proceedings from the International Thermal Spray Conference, 818-824, May 7–10, 2018,
... and chromium oxide. Nonetheless, innovative plasma sources are still being developed to provide more-efficient, tailor-made solutions due to their specific characteristics. A brief overview of the DC-plasma generator Mettech “Axial III” are shown, which generator are allowed to use the central injection...
Proceedings Papers

ITSC 2017, Thermal Spray 2017: Proceedings from the International Thermal Spray Conference, 56-63, June 7–9, 2017,
... Abstract The almost uncontrollable arc movement in a single-cathode-anode system limits the efficiency and process stability of this global used DC plasma spraying technique. A successful approach to stabilize the arc anode attachment and thus to increase process efficiency was the replacement...
Proceedings Papers

ITSC 2017, Thermal Spray 2017: Proceedings from the International Thermal Spray Conference, 285-290, June 7–9, 2017,
... Abstract The authors performed a time-dependent, three-dimensional numerical simulation of a non-transferred DC plasma spray with externally applied magnetic fields. Compressible Navier-Stokes equations with MHD source terms and Maxwell's equations were used as the governing equations...
Proceedings Papers

ITSC2016, Thermal Spray 2016: Proceedings from the International Thermal Spray Conference, 613-616, May 10–12, 2016,
... Abstract In the present work, hollow sphere YSZ powders were deposited by dc plasma spraying using a mixture of CO 2 and CH 4 gases. The plasma plume was monitored with an IR camera and in-flight particle velocity and temperature distributions were recorded at impact. Single splats were...
Proceedings Papers

ITSC 2015, Thermal Spray 2015: Proceedings from the International Thermal Spray Conference, 836-840, May 11–14, 2015,
... Abstract Plasma spray technology is widely employed by industry to apply coatings on different components to protect them from corrosion, wear and high temperature environments. The gases introduced into the DC plasma torch are heated by the arc and a plasma jet exits the torch. Powders...
Proceedings Papers

ITSC2014, Thermal Spray 2014: Proceedings from the International Thermal Spray Conference, 196-202, May 21–23, 2014,
... behavior. arc dynamics cathode shape dc plasma torches magnetohydrodynamics numerical modeling plasma arc spraying International Thermal Spray Conference & Exposition (ITSC 2014) May 21 23, 2014, Barcelona, Spain httpsdoi.org/10.31399/asm.cp.itsc2014p0196 Copy © 2014 DVS Media GmbH...
Proceedings Papers

ITSC2014, Thermal Spray 2014: Proceedings from the International Thermal Spray Conference, 359-362, May 21–23, 2014,
... Abstract This paper presents a new approach to overcome arc plasma instabilities in suspension plasma spraying. The method employs a dc plasma torch with a large cathode cavity. This design modification reduces the Helmholtz frequency of the torch, resulting in a new oscillation mode...
Proceedings Papers

ITSC2012, Thermal Spray 2012: Proceedings from the International Thermal Spray Conference, 864-866, May 21–24, 2012,
... type of DC plasma gun consisted of molecular gases CO 2 +CH 4 . Physical and structural properties were compared with the coating made by SG-100 plasma torch. Gas mixture of CO 2 +CH 4 improves the torch efficiency due to its high thermal enthalpy and conductivity which leads to increased particle...
Proceedings Papers

ITSC 2011, Thermal Spray 2011: Proceedings from the International Thermal Spray Conference, 1267-1273, September 27–29, 2011,
... differ from those obtained using a laminar assumption, thus only more sophisticated models can be expected to improve the simulations. DC plasma torches plasma spraying turbulence models International Thermal Spray Conference & Exposition 2011 September 27 29, 2011, Congress Center, Hamburg...
Proceedings Papers

ITSC 2010, Thermal Spray 2010: Proceedings from the International Thermal Spray Conference, 38-41, May 3–5, 2010,
... Abstract Carbon dioxide (CO 2 ) and hydrocarbons (such as CH 4 ) gas mixtures generate plasmas with much higher enthalpy and thermal conductivity, leading to higher spray process efficiency and improved heat transfer to the sprayed powder. We have employed a DC plasma torch operated with CO 2...
Proceedings Papers

ITSC 2010, Thermal Spray 2010: Proceedings from the International Thermal Spray Conference, 345-351, May 3–5, 2010,
... = 2300). A fast camera (4000 image/s) combined to a fast pyrometer (4000 Hz), allows following the drop flattening. For studding the flattening at the micrometer scale, a DC plasma torch is used to melt micrometer sized alumina particles (around 45 μm). The experimental set-up is composed of a fast (50...
Proceedings Papers

ITSC 2010, Thermal Spray 2010: Proceedings from the International Thermal Spray Conference, 498-503, May 3–5, 2010,
... in Suspension Plasma Spraying (SPS). Submicron particles closely follow plasma instabilities and have non-homogeneous plasma treatment. Recently, it has been shown that arc voltage fluctuations in dc plasma torches, showing dominant fluctuation frequencies between 4 – 6 kHz, are linked to pressure oscillations...
Proceedings Papers

ITSC 2010, Thermal Spray 2010: Proceedings from the International Thermal Spray Conference, 504-509, May 3–5, 2010,
... Abstract The effects of powder loading on temperature distributions of yttria-stabilized zirconia particles during flight, which can be used as a melting status indicator, were investigated in atmospheric dc plasma spraying. Commercially available diagnostic systems were utilized to measure...