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1-8 of 8
Powder Processing and Emerging Materials
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Proceedings Papers
ITSC 2009, Thermal Spray 2009: Proceedings from the International Thermal Spray Conference, 799-817, May 4–7, 2009,
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This paper reviews various powder treatments and particle alteration processes and evaluates their effect on the microstructure and properties of thermal spray coatings. It discusses the benefits and drawbacks of thermal plasma treatments for powders, the use of self-propagating high-temperature synthesis (SHS), and different ways nanopowders are produced and sprayed. It covers several spraying methods and a wide range of materials, including ceramics, metals and alloys, cermets, and composites. It also covers mechanical alloying and powder milling processes and addresses the potential risks of inhaling nanopowders.
Proceedings Papers
ITSC 2009, Thermal Spray 2009: Proceedings from the International Thermal Spray Conference, 818-823, May 4–7, 2009,
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This paper reports on the development of NiZn-ferrite powders and their deposition by air plasma and high-velocity oxyfuel spraying. The microstructure and phase composition of the powders and coatings are analyzed and the influence of process parameters on coating development is assessed for sprayed layers up to 500 μm thick. Particular attention is paid to the degradation of the spinel crystal structure, the formation of iron oxide phases, and elemental loss during spraying. The results show that a degree of ferrite decomposition occurs with the loss of zinc and formation of wüstite and that zinc loss is very dependent on the surface-to-volume ratio of the powder.
Proceedings Papers
ITSC 2009, Thermal Spray 2009: Proceedings from the International Thermal Spray Conference, 824-829, May 4–7, 2009,
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The goal of this study is to find applicable spray conditions for producing tungsten (W), zirconium carbide (ZrC), and W-ZrC cermet layers. In the experiments, W and ZrC powder mixtures were fed into the plasma of a water-stabilized plasma gun and coatings approximately 1 mm thick were sprayed on graphite substrates. Pure W and pure ZrC were deposited under similar conditions. Microhardness, surface roughness, XRD, XRF, dilatometry, and spectroscopic techniques were used to characterize the coatings. The resulting coatings were found to be hard with a high elastic modulus.
Proceedings Papers
ITSC 2009, Thermal Spray 2009: Proceedings from the International Thermal Spray Conference, 830-835, May 4–7, 2009,
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This study investigates the influence of high-frequency pulse detonation (HFPD) spraying parameters on particle characteristics and coating quality. A dual-slit velocimeter was used to measure the velocity and temperature of Al 2 O 3 particles as fuel flow ratio and spray distance were adjusted. Experimental results show that particle velocity varied from 600 to 820 m/s as the fuel flow ratio was changed, but particle temperature remained relatively constant at about 2200 °C. Spraying distance had essentially no effect on in-flight particle properties although it influenced deposition efficiency, as did fuel flow ratio.
Proceedings Papers
ITSC 2009, Thermal Spray 2009: Proceedings from the International Thermal Spray Conference, 836-840, May 4–7, 2009,
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This paper discusses the methods used to produce clad composite powders and the improvements that are typically observed in thermal spray coatings made from them. It also discusses their basic properties, available compositions, and inherent advantages.
Proceedings Papers
ITSC 2009, Thermal Spray 2009: Proceedings from the International Thermal Spray Conference, 841-843, May 4–7, 2009,
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High-purity globular yttria powders prepared by spray drying and sintering were deposited by air plasma spraying. The effect of powder properties and spraying parameters on coating structure and porosity was investigated. Yttria powders with grain size in the 20 to 50 μm range and loose density greater than 1.2 g/cm 3 seemed to be the optimum selection for producing dense, high-quality coatings.
Proceedings Papers
ITSC 2009, Thermal Spray 2009: Proceedings from the International Thermal Spray Conference, 844-848, May 4–7, 2009,
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Iron-based wire feedstocks represent a technical as well as economical alternative to carbide reinforced feedstocks for wear protection applications. To assess the potential of such feedstocks, iron-based cored wires were developed with up to 6 wt% boron. The feedstocks were deposited by electric arc spraying, forming hard, partially amorphous coatings with embedded nanocrystalline boride precipitations. To further improve wear resistance, chromium carbide was blended into the powder filling in some wires. Coatings produced from all feedstocks were evaluated by means of optical microscopy, X-ray diffraction, and microhardness measurements.
Proceedings Papers
ITSC 2009, Thermal Spray 2009: Proceedings from the International Thermal Spray Conference, 849-854, May 4–7, 2009,
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This paper discusses the development of Fe-Cr-C-B powder feedstocks for the production of wear-resistant coatings by HVOF spraying. Chromium content in the powder is in the range of 30 wt% and carbon content is about 5 wt%, yielding a unique powder structure that results in coatings with high and well distributed carbide content. Powder and coating microstructure are examined and the results of wear tests are presented. The extent to which the powders can substitute for conventional carbide coatings is discussed as well.