▎ 摘　　要

NOVELTY - Repairing powder comprises 55-79 wt.% tungsten carbide, 20-40 wt.% cobalt and 1-5 wt.% graphene material. The sum of the mass of each component is 100%. The particle size of the repair powder is 10-30 µm. USE - The powder is useful for repairing tunnel boring machine of main driving sealing runway (claimed). ADVANTAGE - The powder has small space, high repairing efficiency and excellent repairing effect, and can be implemented in the tunnel, and has simple operation. The coating formed by the coating has excellent fracture toughness, porosity, hardness and hardness of 700-1400 HV, and fracture toughness of not less than ≥ 16 MPa m0.5. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: coating; preparation method of coating; and repairing tunnel boring machine of the main driving sealing runway.