Customized Tungsten Carbide Mechanical Seal Rings
Tungsten carbide, a common seal ring material, is made by heating tungsten carbide powder and a metallic binder to 2,700 F (1,500 C) to melt and fuse the binder. This produces an extremely tough, hard ceramic-metal (cer-met), which has good abrasion resistance and is more dense than other seal ring materials .
Because tungsten carbide has the highest tensile strength of any popular seal ring material, it's applied routinely in applications that involve high torque and vibration.
It's also used in high-pressure and large-diameter applications because its high modulus of elasticity reduces seal face distortion.
Tungsten carbide often is mated with silicon carbide in applications such as heat transfer oils, which would blister carbon graphite.
Using two tungsten carbide faces as the inboard set in a dual seal arrangement requires a pumping ring to remove the large amount of frictional heat.