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Recommendation: Coverguard, MW-50 Paste
Primarily the problem to be addressed by these products is graphite oxidation/erosion -- especially at the air-to-metal interface. With the use of these products, graphite life can be extended 2 to 3 times.
Typically, COVERGUARD is applied over the entire graphite surface for both the rotor and stator. At the air-metal interface, MW-50 (a fiber reinforced paste) is built-up as a thick (about 1/4 inch) layer so as to provide longer-life protection.
MW-50 can also be used to repair worn shafts and to repair cracks and breaks. In one field test, a shaft that was reduced in diameter by over 50% was repaired to original dimensions and placed back into service. The life of the repaired shaft was 2 1/2 times longer than that normally observed for a new shaft.
The COMBO Coating of first-coating of COVERGUARD with a topcoating of BN-LUBRICOAT® has been shown effective for getting both oxidation protection of the graphite and also nonwetting/nonsticking due to the Boron Nitride.
Special Note: Fiber ceramic stator guards can also be protected and their life extended between 2 to 3 times by their coating with COVERGUARD.
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