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Class of Mechanical seal face material |
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1. Structure of M/C Seal
Mechanical Seal structure is consist of Seal Ring, Packing Body
1) Seal Ring : The Seal Ring Face of both Rotary and Stationary
Work mutually to perform a primary Seal function
which prevents the fluid leak by pumping pressure.
2) Packing : Prevents the fluid leak through rotating axis, Pump shaft on
Pump Grand Box which is called Secondary Seal function
Selection of material is made with Consideration of chemical, thermal
and elastic properties.
3) Body : It is fixed to Pump shaft and rotating in order to perform
additional Sealing function by preventing
It's Shape selection of material, which is mainly metal is made with
consideration of chemical, thermal and elastic properties.
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2. Characteristic of M/C Seal Face
In order to use M/C Seal long time, mutual working material
must be durable and lubricative.
Those following conditions are generally needed to be
a ideal Seal Ring Face
1) High mechanical endurance and lubrication
2) Good chemical endurance
3) High Mechanical strength and low strain in high temperature
4) High parallel, plane and flat degree of Face
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3. Class of M/C Seal Face
1) Carbon :
Most common material which is suitable for High Velocity
and temperature. Rotation and dry rotation
Because of it's own chemical endurance and low coefficient of friction
2) SiC (Silicon Carbide) :
Fairly good mechanical and chemical endurance, lubrication
make it becomes popular. The properties are better than
Tungsten Carbide in Mechanically and as same as Teflon in chemically
So that it can be used to almost all fluids
3) Tungsten Carbide :
High mechanical strength makes it suitable for material working material.
It is normally combined with carbon but use only itself when use to slurry
containing fluid or Solidification agent containing fluid
4) Al2O3 (Ceramic) :
It can be used to almost every fluid due to good chemical and mechanical but It needs to run at low speed because of vulnerability to thermal shock
5) Tungsten carbide coating :
Coats the tungsten carbide powder on to mutual working surface for general use.
Some unexpected problems can happen when it is used to high speed rotation device in its surface and endurance Mechanical seal
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