In Situ Synthesis of Tungsten Carbide Coating

Tungsten carbide ceramics because of its high melting point, high chemical stability, high hardness and excellent wear resistance and corrosion resistance, has become a hot topic in the study of metal ceramic composite materials than in recent years, tungsten carbide fiber reinforced metal matrix composites, has the advantages of simple preparation process and low cost.

Compared with other commonly used nitride ceramics and oxide ceramics, tungsten carbide ceramics not only have high microhardness, good physical and chemical stability, but also have good wettability with molten iron, and the wetting angle is close to zero, which is the best choice for ceramic particles as reinforcement phase. Therefore, the tungsten carbide particles have a very important position in the application of the coating.

The preparation technology of tungsten carbide particle reinforced metal matrix surface composites at home and abroad is mainly composed of casting infiltration, thermal spraying, powder sintering, fusion casting, ion impregnation, surfacing, laser cladding, in-situ synthesis, ESR casting and so on.

The preparation technology of tungsten carbide particle reinforced metal matrix surface composites at home and abroad is mainly composed of casting infiltration, thermal spraying, powder sintering, fusion casting, ion impregnation, surfacing, laser cladding, in-situ synthesis, ESR casting and so on. In this article, the method of in situ synthesis is mainly introduced.

In situ synthesis, using tungsten argon arc high temperature conditions, during the deposition process, the WC coating was generated by the synthetic reaction between the specific sprayed raw materials. The preparation of the in-situ synthesis coating is divided into the matrix treatment stage, the mixed powder paste body and the heating deposition stage.

The first substrate material into the required shape, and then use the wheel to remove surface oxide on the surface becomes flat, light, and then the raw material powder grinding in a mortar mixed with a certain proportion of uniform, then add the right amount of water glass is modulated into a paste evenly coated on the surface of the substrate is about 2mm, the paste evenly coated in the air for a period of time, after the coating surface evaporation of water glass clean, the coating drying in oven, the temperature should be controlled at about 100 DEG C, holding a hours after furnace cooling.

At last, the tungsten arc argon arc is used as the heat source, and the suitable current heating coating is chosen to melt it and be combined with the parent material.

The results show that the tungsten carbide ceramic coating is in situ synthesized under the condition of the tungsten argon arc as the heat source, it can obtain high performance high temperature layer and wear-resistant layer, which has the advantages of simple process and stable synthesis.

• < Prev
• Next >