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1.enhance hardness of materials
Research structure shows that the abrasive wear depends on the ratio of metal hardness Hm and abrasive hardness Ha. When Hm/Ha > 0.8, metal wear falling rapidly, when Hm/Ha = 1.25-1.3, the wear quantity is very small. Visible, to reduce the abrasive wear, hardness of metallic materials Hm should be 1.25 -1.3 times that of abrasive hardness Ha, namely Hm = (1.25 1.3) Ha. This data can be used to judge low wear rate.
2.surface treatment
Use a variety of surface treatment technology, the change of surface feature about valve clack and seat is an important way to improve the abrasive wear. In addition, to improve the surface roughness on the surface of the material flow can reduce the the abrasive wear of surface scratch, it can also delay scaling. Besides producing abrasive wear, but also accompanied erosion wear. In contact with the disc and seat while delivery of slurry , local pressure is lower than the evaporation pressure, it can form bubbles; Dissolved gas in the liquid precipitation also form bubbles, when these bubbles through high pressure area, bubble will burst under pressure, produced great impact and high temperature in an instant. Due to the effect of repeated formation and burst of the bubble, it can make the disc and seat surface fatigue wear, thereby generate pittings and holes, this is cavitation abrasion.
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