The Sand Flow Influenced Tungsten Carbide Porous Nozzle

First of all, the concentration of sand grain can be neglected. The higher concentration means that the more sand grains, which collide with nozzle inner wall will be more seriously. So the abrasion of nozzle inner wall is proportional to the number of the grain the sand flow contains. However, if the grain exceeds a certain number, the space of the movements will be limited so that the abrasion will decrease.

And the hardness of the sand grain is also important. To some extent, the abrasion of nozzle depends on both nozzle material and the sand grain hardness. When the hardness of grain is lower than nozzle hardness, such as tungsten carbide and pottery, the grain is not able to cut into the material. So the abrasion is slight and fatigue wear is the main abrasive pattern. When the hardness of grain is equal to nozzle, the abrasion is increasing. If the hardness of grain is higher than nozzle, such as some metal materials, it is called micro-cutting abrasion.
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