A high bulk modulus oil, which promises to enhance the responsibility and efficiency of hydraulic systems, has been developed because of high pressure operation. Although cavitation erosion in the hydraulic components is a serious concern, the phenomena and behaviors of the oils for the erosion have not been examined. This report investigates the characteristics of cavitation erosion caused by a cavitating jet in terms of high bulk modulus oils produced with different compounding agents and molecular weights and mineral oils prepared as a reference. The experiment was conducted in a test rig, applying the jet-cavitation method under an upstream absolute pressure of 10.1 MPa. The diameter and thickness of the aluminum alloy specimens were 15 and 5 mm, respectively. The mass loss was maximized at a specific standoff distance, and the surface erosion was ring-like, as previously reported for general hydraulic oils and municipal water. The mass losses in the high bulk modulus oils and mineral oils increased with increasing liquid temperature and decreasing cavitation number under the test conditions. Although the erosion is intrinsically enhanced because of the high bulk modulus oils with high density, the erosion can be reduced by adding high molecular-weight polymer.
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