Model of the cavitation wear resistance of metal powder filled epoxy composites

Abstract

A powder-filled epoxy compound was tested for cavitation wear in the form of bronze particles BraZHNMc9-4-4-1. The particles were obtained by sawing a bronze bar. The composition of the compound was as follows: 100 parts of resin K-153 and 12 parts of hardener (polyethylene polyamine). The specimens were shaped as cylinders, 15.5 and 15 mm in diameter and height, respectively. The tests were carried out with an ultrasonic magnetostrictive vibrator in fresh water at water temperature 20 ± 3 ° C. The frequency and amplitude of oscillations of the vibrator hub end were approximately 22 kHz and 28 μm, respectively. The distance between the end of the concentrator and the end of the specimen wear was set to 0.5 mm. A second-order model describing the cavitation wear as a function of the bronze particle size, its content in the composite and the specific surface area of the particles was constructed by the least-squares method. The cavitation wear of the composite increases with increasing values of these parameters. The greatest influence on composite cavitation wear has the total surface area of bronze microparticles in volume unit.