摘要
Isostatic graphite materials with 8%porosity and 14%porosity were prepared by the cold isostatic pressing process.Cavitation erosion resistance of the isostatic graphite was evaluated through cavitation tests in an ultrasonic vibration system.The volume loss and erosion morphology of the isostatic graphite were adopted to investigate the cavitation erosion resistance of the isostatic graphite.The cavitation test results show that after ultrasonic vibration of 14 h,the volume loss of the isostatic graphite materials with 8%porosity and 14%porosity are 35%and 46%of the carbon graphite material,respectively.The isostatic graphite material with 8%porosity exhibits an outstanding capability to resist cavitation erosion damage,and the cavitation erosion resistance of the isostatic graphite enhances with the decrease in porosity.The damage mechanism of isostatic graphite is brittle fracture attributed to the shock wave and micro jet.The isostatic graphite with low porosity exhibits excellent cavitation erosion resistance due to its fine graphite particles,homogeneous structure and high degree of hardness.
通过冷等静压工艺制备了孔隙率为8%和14%的等静压石墨,通过超声振动空蚀试验系统对等静压石墨的抗空蚀性能进行了研究,采用等静压石墨的体积损失和表面破坏形貌揭示其抗空蚀性能.空蚀试验结果表明:超声振动14 h后,与普通碳石墨相比,孔隙率为8%和14%的等静压石墨体积损失分别为普通碳石墨的35%和46%;孔隙率为8%的等静压石墨表现出更强的抗空蚀能力,且等静压石墨的抗空蚀能力随着孔隙率的降低而增加;等静压石墨空蚀破坏的机制是冲击波和微射流作用下等静压石墨材料的脆性断裂;由于粒度小、组织均匀及硬度高,低孔隙率的等静压石墨表现出良好抗空蚀性能.
基金
The National Natural Science Foundation of China(No.51635004,11472078)。
