Experimental Study on a New Test Apparatus for the Surface Damages Combined with Slurry Wear and Cavitation Erosion

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1. A new test apparatus was constructed by combining an ultrasonic vibratory cavitation device and a slurry jet device in order to study combined damages with slurry wear and cavitation erosion. Experimental results were obtained as follows.(1)When cavitation and slurry erosions are combined, the damage loss increases in proportion to time without an incubation period because solid particles remove the surface successively and does not coincide with simple summation of each damage loss. Under low jet flow velocity, cavitation erosion is reduced by solid particles. When jet flow velocity is high, cavitation bubbles flow out from the surface and the solid particles remove the plastic deformations in which produce the erosion debris, thus the cavitation erosion is diminished.(2)Cavitation erosion increases in water containing solid particles. The degree of the increase of damage is larger for angular particles such as abrasives and silica sands than glass beads. With increasing particle size, the damage shows a maximum at a given value and decreases.2. The test method which slurry jet containing cavitation bubbles acts on the stationary specimen was developed. The combined damage is larger than slurry wear.3. An air-blast erosion test apparatus was constructed in order to investigate the characteristics of wear caused by a stream of impinging solid particles. The wear of materials by impacts of solid particles at room and high temperatures could be estimated from the impinging conditions and the properties of materials and particles.From these results, it is found that the test apparatuses developed in this study are very useful to investigate the slurry wear and the damages combined with slurry wear and cavitation erosion.