Why is cemented carbide generally chosen for the mechanical seals of chemical pumps, while silicon carbide is used for those of clean water pumps?
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Why is cemented carbide generally chosen for the mechanical seals of chemical pumps, while silicon carbide is used for those of clean water pumps?
The original poster has it backwards; many chemical pumps use silicon carbide mechanical seals, while clean water pumps are equipped with cemented carbide mechanical seals.
From the perspective of corrosion resistance, the original poster’s view is reversed
Most chemical process pumps we come across use silicon carbide
Tungsten carbide and silicon carbide each have their advantages and disadvantages; depending on the medium and whether there are many particles in it, modifications can be made according to the specific conditions of the material.
That makes sense; silicon carbide is more wear-resistant, and media containing particles may also last a long time. Chemical raw materials generally have a single type of medium, so they are relatively clean
Our vacuum pump mechanical seals are made of silicon carbide + graphite
Now alloy prices are higher, and imported graphite is more expensive as well. It’s more troublesome to buy imported graphite now.
Most chemical pumps use silicon carbide and graphite; cemented carbide is used only when the medium is relatively clean.