The vacuum mud machine for honeycomb ceramic production equipment has problems in production and use: the extrusion screw runs for a long time, and the gap between it and the inner wall of the mud cylinder is too large, resulting in severe wear of the screw reamer and no feeding. By thermal spraying tungsten carbide wear-resistant coating with a thickness of 0.3mm, the surface hardness of the spiral blade reaches HV1000 ↑, and the surface roughness is: Ra0.8-1.2， The wear resistance effect can reach 20 times that of the original base material.