Abstract
Cavitation erosion tests were carried out on 10 kinds of base metals such as irons and stainless steel castings, and 7 kinds of coatings used as pump materials. The cavitation erosion resistance was compared with the slurry wear resistance. For base metals, the ratio of the cavitation erosion rate to the slurry wear rate can be predicted by the breaking elongation obtained in the tensile test, because the cavitation erosion initiates at the weak second phase of the material which gives the low elongation. For thermal spray coatings, the cavitation volume loss increases rapidly in the initial stage due to the removal of the soft layer, and then it increases at a slower rate. It was concluded that the cavitation erosion resistance has a poor correlation with Vickers hardness of the material, and that the slurry wear resistance has a good correlation with the hardness, provided that the brittle material of the thermal sprayings are excluded.
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