2.The spiral blade made by powder metallurgy sintering with polytetrafluoroethylene as the base material, filled with polymer powder or alloy powder and oxide, has high wear resistance, and the annual wear loss is only 0.002 -0.004mm.
3.The wear-resistant material should be covered in the easily worn part of the spiral blade. When the wear-resistant material reaches a certain wear value, a new wear-resistant material shall be replaced.