Metal carbide (such as tungsten carbide, etc.), has many excellent properties, making the sealing ring is very suitable. However, because of the very high melting point of these carbide, ordinary smelting methods are not feasible. Usually using the method of powder metallurgy, it is to make the carbide into a very fine powder, mixed with the metal with a low melting point, pressing molding, sintering at high temperature, the lower melting point of the metal melting, the metal carbide bonded into a whole, you can get a hard alloy. Common carbide include tungsten carbide with drill as binder, corrosion resistant carbide with nickel and chromium as binder, steel junction carbide with steel as binder and various carbide rods for overwelding.

1. High hardness. The hardness of tungsten carbide carbide is generally between HRA 87 and 94, and the hardness is basically constant in the same temperature range. Because the wear rate of grinding particle wear is inversely proportional to the hardness, the carbide material with high hardness is the ideal friction auxiliary material for sealing the mechanical seal containing the suspended particle medium.
2. High flexural strength. The flexural strength of carbide carbide is generally above 1400MPa, and the size of the flexural strength is related to the size of WC grains.
3.  High thermal conductivity and small linear expansion coefficient. The thermal conductivity of WC-Co type of carbide carbide is 1~ times higher than that of high-speed steel, while the linear expansion coefficient is much smaller than that of high-speed steel and carbon steel. Therefore, the mechanical sealing of friction side ring material has strong heat impact resistance and bearing capacity.
4.  Have a certain corrosion resistance ability. Different carbide carbide brands have different corrosion resistance in various media. Therefore, different carbide alloys can be selected according to the specific medium properties.