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Carbon graphite is the most widely used basic material in the soft material of mechanical seal friction pair. It has many excellent properties. Such as good self-lubrication and low friction coefficient, excellent corrosion resistance (except for strong oxidizing media such as aqua regia, chromic acid, concentrated sulfuric acid and halogens. It can resist other acids, alkalis and salts class and all organic compounds), good thermal conductivity, low coefficient of linear expansion, good pairing performance, easy processing, and low cost. Carbon graphite is made of coke powder and graphite powder (or carbon ink) as the base material, and asphalt as the drilling platform. It is formed by molding and sintering at high temperature.
However, carbon graphite has the disadvantages of large porosity (18%~22%) and low mechanical strength. Therefore, when carbon graphite is used as a sealing ring material, impregnation and other methods are required to fill the pores and improve its strength. Impregnation The properties of the impregnating agent determine the chemical stability, thermal stability, mechanical strength and applicable temperature range of impregnated graphite.
At present, there are two types of impregnating agents commonly used: synthetic resin and metal:
1) When the operating temperature is lower than or equal to 180°C, graphite impregnated with synthetic resin can be used. Commonly used impregnating resins are phenolic resin, epoxy resin and furan resin. Phenolic resin has good acid resistance. Epoxy resin has good alkali resistance. Furan resin has good acid and alkali resistance, so furan resin impregnated graphite ring is the most common application.
2) When the service temperature is higher than 180°C, the metal-impregnated graphite ring should be selected, but the melting point of the impregnated metal, medium corrosion resistance, etc. should be considered. The commonly used impregnated metals are Babbitt alloy, copper alloy, aluminum alloy, antimony Alloy etc. Antimony-impregnated carbon graphite has high flexural and compressive strengths, up to 30MPa and 90MPa respectively, and the service temperature can reach 500°C; the service temperature of carbon graphite impregnated with copper or copper alloy is 300°C, and the service temperature of carbon graphite impregnated with Babbitt alloy is 120°C ~180°C.
Technical parameters are as follows:
Carbon graphite is the most widely used basic material in the soft material of mechanical seal friction pair. It has many excellent properties. Such as good self-lubrication and low friction coefficient, excellent corrosion resistance (except for strong oxidizing media such as aqua regia, chromic acid, concentrated sulfuric acid and halogens. It can resist other acids, alkalis and salts class and all organic compounds), good thermal conductivity, low coefficient of linear expansion, good pairing performance, easy processing, and low cost. Carbon graphite is made of coke powder and graphite powder (or carbon ink) as the base material, and asphalt as the drilling platform. It is formed by molding and sintering at high temperature.
However, carbon graphite has the disadvantages of large porosity (18%~22%) and low mechanical strength. Therefore, when carbon graphite is used as a sealing ring material, impregnation and other methods are required to fill the pores and improve its strength. Impregnation The properties of the impregnating agent determine the chemical stability, thermal stability, mechanical strength and applicable temperature range of impregnated graphite.
At present, there are two types of impregnating agents commonly used: synthetic resin and metal:
1) When the operating temperature is lower than or equal to 180°C, graphite impregnated with synthetic resin can be used. Commonly used impregnating resins are phenolic resin, epoxy resin and furan resin. Phenolic resin has good acid resistance. Epoxy resin has good alkali resistance. Furan resin has good acid and alkali resistance, so furan resin impregnated graphite ring is the most common application.
2) When the service temperature is higher than 180°C, the metal-impregnated graphite ring should be selected, but the melting point of the impregnated metal, medium corrosion resistance, etc. should be considered. The commonly used impregnated metals are Babbitt alloy, copper alloy, aluminum alloy, antimony Alloy etc. Antimony-impregnated carbon graphite has high flexural and compressive strengths, up to 30MPa and 90MPa respectively, and the service temperature can reach 500°C; the service temperature of carbon graphite impregnated with copper or copper alloy is 300°C, and the service temperature of carbon graphite impregnated with Babbitt alloy is 120°C ~180°C.
Technical parameters are as follows:
