Process for making machines resistant to cavitation and liquid droplet erosion

摘要

The method comprises explosively bonding a NiTi alloy to a steel workpiece formed in the shape of at least a portion of a desired hydraulic device. The nickel content of the NiTi alloy is sufficient to place the alloy substantially completely in the beta phase at or about room temperature. This nickel content is typically between about 55 weight percent to about 56 weight percent. The NiTi alloy is provided in the form of a strip having a thickness of from about 0.01 inch (0.25 mm) to about 1.0 inch (25 mm). After annealing, the NiTi alloy again is heated, to increase the ductility of the NiTi alloy. The NiTi alloy typically is maintained at this temperature and explosively bonded to the workpiece to cover at least a portion of the surface area with the NiTi alloy. The present invention also includes NiTi-metal composites made according to the process of the present invention. These NiTi-metal composites are superior for resisting cavitation erosion and LDE when compared to conventional materials.