Ceramic for repairing damaged ceramic coating on surface of metal and argon arc welding method thereof

Abstract

The invention relates to ceramic for repairing a damaged ceramic coating on the surface of a metal and an argon arc welding method thereof. The method comprises the following steps of: selecting metal ceramic powder according to the material of a to-be-repaired ceramic coating on the surface of the metal, uniformly mixing, pressing to be stripped, and sintering at 1400+ / -20 DEG C; surfacing the preheated ceramic damaged part on the surface of the metal by using metal ceramic welding rods in a way of manual argon arc welding, simultaneously smelting base metal, metal ceramic and two connected ceramic joints by using generated electric arcs to form a molten pool so that metallurgical bonding is formed among the metal ceramic, the ceramic and the base metal and a metal ceramic coating is formed on the to-be-repaired ceramic damaged part on the surface of the metal; and welding with trailing peening the newly solidified metal ceramic coating still in a red hot state in the welding process. The metal phase in the metal ceramic welding rods adopted by the invention can improve the difficulty of striking the arc by single ceramic material and solves the problem that the ceramic material is difficult to generate stable electric arcs.

Description

technical field [0001] The invention relates to a ceramic-to-ceramic argon arc welding method for repairing damaged ceramic coatings on metal surfaces. The utility model belongs to the technical field of ceramics and ceramic welding. Background technique [0002] There are two common defects of ceramic coatings on metal surfaces: one is cracks in the ceramic layer, especially penetrating cracks, that is, cracks extending to the substrate affect the corrosion resistance of the metal, so that it cannot be used or shortened in many corrosion-resistant occasions. service life. Another flaw is partial fragmentation. There is currently no viable workaround for this defect. [0003] The welding between ceramics usually adopts methods such as brazing, laser welding or microwave welding. The brazing strength is lower and the process is more complicated. It needs to be plated before welding. Laser welding and microwave welding have the disadvantages of inflexible equipment and h...

AI Technical Summary

Problems solved by technology

[0002] There are two common defects of ceramic coatings on metal surfaces: one is cracks in the ceramic layer, especially penetrating cracks, that is, cracks extending to the substrate affect the corrosion resistance of the metal, so that it cannot be used or shortened in many corrosion-resistant occasions. service life

But to achieve manual argon arc welding, a stable arc must be formed at the welding place first, that is, argon arc welding should ensure that the welding material can conduct electricity, but most of the ceramic materials have poor conductivity or no conductivity at all.