| 摘要 |
PURPOSE:To obtain an oil-free sealing device for a long life stirring engine having excellent abrasion resistance by using a sealing ring main body which is compoundedly filled with a carbon fiber and a carbon powder, a boron nitride powder, or a molybdenum disulfide powder. CONSTITUTION:The material of a sealing ring main body 7 is one in which a polytetrafluoroethylene-made matrix is compoundedly filled with a carbon fiber and at least one kind of a carbon powder, a boron nitride powder, or molybdenum disulfide powder, and is a sealing device 6, for a stirring engine, composed of the combination with a plate expander 9 contacting the inner peripheral surface of the sealing ring main body 7 and extending the sealing ring in the outer peripheral direction. Preferably the sealing ring main body 7 is made to contain the carbon fiber of 10-20wt.% and the molybdenum disulfide powder, the boron nitride powder, or carbon powder of 5-15wt.%. This can extremely improve abrasion resistance under a high temperature condition.
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