Evaluation of Abrasive/Erosive Wear Resistance of Some Hard Coating Materials by Coriolis Wear Testing

摘要

Due to tremendous abrasive and erosive wear challenges faced in a slurry transportation system, application of hard coating materials has received more and more attention to extend service life of components such as shaft sleeves and pump liners, impellers and casings. Previous studies have proven that the Coriolis wear testing is a valuable and practical approach to study erosive wear behaviors of materials within a centrifugal slurry pump system. Although extensive research can be found on wear of coating materials, the work conducted using the Coriolis wear testing approach is very limited. In the present research, sliding Coriolis wear tests with slurry containing silica sand particles have been performed to evaluate the erosion wear resistance of some hard coatings such as flame-sprayed NiCrSiB, NiWCrSiB and WC-NiCrSiB coatings, sintered WC-NiCrB coatings, and HVOF sprayed WC-Co coatings. Micro structure and wear surface conditions of coating specimens have also been examined using optical and electron microscopy. Test results indicate that the concentration of carbides, the WC in particular, is the single most important parameter on abrasive/erosive wear resistance of the tested hard coatings. The effects of density/porosity and grain/particle sizes on erosive wear performance have also been discussed.