低温環境下における銀めっき材のキャビテーション壊食

抄録

It is well known that cavitation occurs in inducer pumps used for space rockets. Silver plated coating on the inducer liner faces the damage to erosion. In this study, we carried out cavitation erosion tests for seven silver plated coatings in stationary specimen method using a vibratory apparatus. We analyzed the erosion behavior of these coatings and discussed the erosion resistance. The erosion resistance of silver coating could be evaluated in terms of material hardness and was ranked between pure aluminum and pure copper. Moreover, we carried out erosion tests using vibrating specimen method in deionized water, liquid nitrogen and ethanol for the silver coating which showed the highest erosion resistance in stationary specimen method. We found that erosion occurred in low-temperature ethanol, but not in liquid nitrogen.