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Abstract
Several diffusion alloying, chemical vapor deposition (CVD) and ion implantation coatings on WC-Co and WC-Ni base materials were evaluated in a combined laboratory and field testing program. A slurry erosion test and field test, as well as analysis of material properties such as microhardness, fracture toughness and microstructure, were conducted. The WC-Co base material was found to be superior to WC-Ni. The CVD TiN on WC-Co base was the most erosion-corrosion-resistant coating followed by the CVD Al 2O 3 and a boron diffusion coating. The scaling resistance of the materials was also evaluated, and it was closely related to their erosion-corrosion resistance. The best materials displayed high resistance in the slurry erosion tests and improved surface microhardness. However, corrosion resistance, surface microstructure, microhardness and fracture toughness characteristics can significantly alter this relationship. The broad laboratory and field testing program was found to be useful in the evaluation of the materials.
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