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H.M. Hawthorne
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Proceedings Papers
ITSC 2004, Thermal Spray 2004: Proceedings from the International Thermal Spray Conference, 846-851, May 10–12, 2004,
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Controlled scratch testing, dry abrasion tests and hardness measurements were performed on WC-12Co coatings produced by the high velocity oxy-fuel spraying of nanostructured and conventional feedstock powders. The information obtained employing these different evaluation techniques was used to provide insight into coating behaviour and identify the most abrasion-resistant coatings. The results indicated a correlation between scratch hardness and the microhardness determined by Vickers indentation for the coatings. There was good agreement between the scratch test and the abrasion test in identifying the best coatings for use in dry abrasion. Observation of the scratched surfaces and wear scars indicated material removal by splat debonding and fracture. The results demonstrate the usefulness of the scratch test for assessing the abrasion resistance and wear behaviour of coatings.
Proceedings Papers
ITSC1999, Thermal Spray 1999: Proceedings from the United Thermal Spray Conference, 350-354, March 17–19, 1999,
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Plasma sprayed (PS) ceramic coatings have found widespread commercial use, particularly for wear resistant surfaces. Understanding of the micromechanical basis of macroscopic weight loss through wear is very important for the development of improved coatings and better uses for existing coatings. This paper aims to elucidate the wear mechanisms that occur when a PS ceramic coating is in sliding contact with a harder asperity, using controlled scratch testing as a model abrasion test. It attempts to relate the scratch test results to the microstructural integrity, or cohesion, of the various coatings. Paper includes a German-language abstract.
Proceedings Papers
ITSC1998, Thermal Spray 1998: Proceedings from the International Thermal Spray Conference, 791-796, May 25–29, 1998,
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In an effort to obtain a series of plasma-sprayed coatings of controlled microstructure, three monosized sapphire powders were deposited using an axial injection torch in which the plasma gas composition and nozzle diameter were the only parameters varied. The effect of these parameters on splat morphology, porosity, angular crack distribution, and hardness is reported. Uniform, dense microstructure with a hardness rivaling chromia coatings was achieved through a combination of tightly controlled processing conditions and the use of mono-disperse precursor powders.