| 摘要 |
This device is designed for use in the art of oilfield equipment for high-pressure pump plungers. The plunger is configured in the form of a rod made of structural steel with a cylindrical working surface and lead-in chamfers. The working surface of the rod has an annular V-shaped bore, forming a spraying region with a depth of from 0.02 to 2 mm, to which a cermet coating is applied by thermal spraying, preferably flame spraying, said coating being based on one of the following materials: WC/CoCr, WC/Ni, Cr3C2/NiCr, WC/Cr3C2/Ni with a nanostructured component. The spraying region comprises the entire length of the working surface with the exception of the regions adjacent to the lead-in chamfers, each of which regions is a maximum of 5 mm in length. The coating provides high resilience in an aggressive environment and protects against corrosion. |
