Impregnated graphite
Pinyin of impregnated graphite: jinzishimo English Name: impregnated graphite note: also known as impregnated graphite or impregnated impermeable graphite. Impermeable graphite. Graphite is impregnated with synthetic resin to fill its surface and internal pores, and then cured by heat treatment. Compared with graphite, the mechanical strength is improved and the thermal conductivity is unchanged. With the different impregnating resins, there are phenolic impregnated graphite and furfuryl alcohol impregnated graphite.
Common materials for mechanical seals
The sealing performance and service life of mechanical seals are related to the materials of various parts, especially the materials of end seals (friction pairs), auxiliary seals and springs.
1、 Materials of face seal friction pair
Friction pair materials include graphite, ceramics, surfacing cemented carbide, tungsten carbide alloy, SiC, filled polytetrafluoroethylene, tin bronze, steel bonded cemented carbide, stainless steel, phenolic plastic, nylon, etc. The properties of common materials are as follows:
1. Graphite
Graphite has the advantages of good corrosion resistance and self lubrication, small friction coefficient, good heat shock resistance and easy processing, but has the disadvantages of low mechanical strength and pores. These two disadvantages of graphite can be improved by impregnation and carburization. Impregnated graphite can be divided into impregnated resin and impregnated metal. Resin impregnated graphite has good corrosion resistance, but is not resistant to high temperature (about 170 ~ 200 ℃); High temperature resistance of impregnated metal graphite is good (high temperature resistance of impregnated bronze, aluminum and lead can reach 400 ~ 500 ℃), but corrosion resistance is poor. Graphite is the most widely used non-metallic material, which is used as the moving ring of low and medium speed mechanical seals and the static ring of high-speed mechanical seals. Good graphite looks dense to the naked eye, and the fingers do not get powdered and stained.
2. Ceramics
The advantages of ceramics are good corrosion resistance, high hardness and good wear resistance, but the disadvantages are high brittleness and too high hardness to process. Alumina ceramics and cermets are widely used. Ceramics are mostly used in corrosive media, medium and low speed applications.
3. Hardfacing cemented carbide
Surfacing cemented carbide on the sealing surface of carbon steel, chromium steel and chromium nickel steel has the advantages of high hardness, good wear resistance, good temperature resistance (below 500 ℃), good corrosion resistance or cavitation resistance, but the disadvantages are easy to produce air holes, slag inclusions and uneven surface hardness.
4. Tungsten carbide alloy
Metal carbides with high hardness and high melting point, such as tungsten carbide and titanium carbide, are pressed and sintered by adding binder powder metallurgy. The advantages are high hardness and strength, wear resistance, high temperature resistance, corrosion resistance, low linear expansion coefficient, and the disadvantages are brittle and difficult to process. Tungsten carbide is the most widely used face seal pair material, which is mostly used as the static ring of low and medium speed mechanical seals and the dynamic ring of high-speed mechanical seals.
2、 Material of auxiliary sealing ring
The auxiliary sealing materials are required to have good elasticity, low friction coefficient, good wear resistance, heat resistance and low temperature resistance, and resistance to medium corrosion, dissolution and aging. In addition, they are also required to have good residual deformation after compression and long-term use. The commonly used auxiliary sealing ring materials are rubber and polytetrafluoroethylene, in addition to soft PVC.
1. Rubber
Rubber has good elasticity, cushioning, vibration absorption, heat resistance and corrosion resistance. Rubber sealing ring has good sealing effect and is widely used. Commonly used rubbers include silicone rubber, nitrile butadiene rubber, neoprene rubber and fluororubber.
2. Polytetrafluoroethylene
Polytetrafluoroethylene has the advantages of excellent chemical stability, oil resistance, dissolution resistance, moisture resistance, low friction coefficient, and is suitable for various corrosive media. The disadvantage is that its elasticity is poor compared with rubber, and it is easy to produce permanent deformation.
3、 Elastic element material
1. Spring material
The requirements for spring materials are: good elasticity and medium corrosion resistance. Common spring materials include stainless spring steel (1Cr18Ni9Ti, etc.), chromium steel (3Cr13, 4Cr13, etc.), carbon spring steel (60Si2Mn, etc.) and phosphor bronze.
2. Corrugated pipe material
The requirements for corrugated pipe materials are: good welding performance; Greater elasticity; Certain corrosion resistance. Common corrugated pipe materials include iron-based, copper based, nickel based alloys and titanium materials. Generally, nickel chromium austenitic strip in iron base is mainly used, especially 1cr18ni125mnmo2ti. High nickel elastic alloy is considered to be an ideal material for making bellows, and aluminum containing materials will encounter difficulties when using general welding technology. At present, am350 (similar to cr16ni45mnmo3n) is the most widely used corrugated pipe material abroad, which belongs to solid solution, low strength, low hardness and high elongation.
Sealed materials
Wear resisting graphite,
Electric spark processing,
Die casting mold,
Metal Tu crossing
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Main purpose
Carbon graphite products for electronic semiconductor industry: semiconductor graphite mold, fuel cell deflector, graphite matrix, graphite pad for silicon cutting rod, graphite liner for electron beam evaporation, graphite boat for glass metal packaging, graphite for electronic sintering mold, graphite components for ion implantation
Graphite thermal field for single crystal furnace, etc.
Carbon graphite products for high-temperature treatment of industrial furnaces are used for various heating elements in large industrial furnaces or vacuum furnaces, such as heating chambers, furnace beds, heating pipes, supports
Connecting plate, regulating plate, connecting piece, conductive rod joint, heater, heat insulation chamber, tray, burning box, graphite disk, etc.
Carbon graphite products for diamond tool sintering mould specific products include: graphite composite mould, clay mould, diameter retaining ring and nozzle rod for oil drill bit
The specific products of carbon graphite products for non-ferrous metal smelting and processing include: graphite crucibles, graphite boats, precision casting graphite molds, molten gold crucibles, graphite diverters, graphite sleeves, graphite crystallizers, flow nozzles, crucibles for welding metal cables, stirrers for degassing, rotor rods and impellers.
The specific products of carbon graphite products used in the mechanical industry include: graphite sealing moving rings, sealing static rings, graphite bearings, lubrication columns, graphite blades, and mechanical seal parts impregnated with various metals or resins.
The characteristics of high-purity graphite include high temperature resistance below 3000C, high temperature non deformation, high conductivity, friction resistance, self lubrication, economy, etc,
Main purpose
Carbon graphite products for electronic semiconductor industry
Semiconductor graphite mold, fuel cell deflector, graphite matrix, graphite pad for silicon cutting rod, graphite liner for electron beam evaporation, graphite boat for glass metal packaging, graphite for electronic sintering mold, graphite parts for ion implantation
Graphite thermal field for single crystal furnace, etc.
Carbon graphite products for high temperature treatment of industrial furnace
Various heating elements used in large industrial furnaces or vacuum furnaces, heating chambers, furnace beds, heating pipes, supports
Connecting plate, regulating plate, connecting piece, conductive rod joint, heater, heat insulation chamber, tray, burning box, graphite disk, etc.
Carbon graphite products for diamond tool sintering mould
The specific products are: graphite composite mold, clay mold, diameter retaining ring and nozzle rod for oil drill bit
Carbon graphite products for nonferrous metal smelting and processing
The specific products are: graphite crucible, graphite boat, precision casting graphite mold, molten gold crucible, graphite shunt, graphite sleeve
Graphite crystallizer, flow nozzle, melting pot for welding metal cable, agitator for degassing, rotor rod and impeller.
Carbon graphite products for mechanical industry
The specific products are: graphite sealing moving ring, sealing static ring, graphite bearing, lubricating column, graphite blade, impregnated with various metals or
Mechanical sealing parts of resin.
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