Method for in situ synthesis of tungsten carbide based hard alloy coating on casting surface

摘要

Specification Abstract A method for in situ synthesis of tungsten carbide based hard alloy coating on casting surface, belongs to metal based composite material preparation technical field. Adopting vacuum lost foam casting technique, W powder, graphite powder, metal powder are mixed, and agglomerant is added to produce powder coating paste, then the powder coating paste is coated on the surface of EPS foam plastic model or filled in the holes and grooves of the model. In the pouring process, high temperature molten steel induces self-propagating synthesis reaction, that is 3W+2C--*WC+W 2C, to form tungsten carbide based hard alloy phase, and obtain surface or part self-propagating synthesis of tungsten carbide based hard alloy coated castings. The advantages of the present invention are, good surface quality of the castings, solid combination of coating and castings, high abrasive resistance, not falling off of antifriction alloy layer, and simple technique, suitable for industrial production.