Repair of Worn Surface of CO₂ Impregnator

In order to repair the worn surface of CO₂ impregnator to prevent CO₂ leaking, special low temperature wear-resistant material UTP34N of Germany was chosen as the fusion layer and caulking layer material of repaired surface and alloy Co-WC (an alloy from powder metallurgy comprising carbide of high melting metal as hard phase and steel as cementing phase) as surface layer spray coating material, the impregnator' s lid and annular lock were partially repaired with cold-welding surfacing and supersonic thermal spraying.After repairing, the clearance between the lid and impregnator's body reduced from 2.1 to 0.8 mm; the results of hydraulic pressure test conducted under more than 1.25 times pressure indicated that the seal ability was satisfactory in terms of safety and technology; and the working life of lid and annular lock were prolonged.