Vacuum furnace graphite has good vacuum performance, thermal conductivity, low coefficient of thermal expansion, increased strength with the increase of temperature, good processing technology, and low cost, so it is a kind of high-quality and low-cost material. Graphite block for vacuum furnace is not only used to manufacture heating elements and heat insulation screens of vacuum furnaces, but also used to manufacture stressed structural parts such as supports, material trays, guide rails, bolts, bearings, fan blades, and so on. Its application in vacuum furnaces greatly simplifies the design and manufacture of vacuum furnaces, reduces the consumption of metals such as tungsten, molybdenum, tantalum, and stainless steel, reduces the cost, improves some properties of vacuum furnace and expands the application range of vacuum furnace.
Vacuum furnace graphite has good high-temperature strength. At room temperature, the strength of graphite is much worse than that of metal, but its strength increases gradually with the increase of temperature, which will exceed all oxides and metals;
Vacuum furnace graphite is easy to obtain and cheaper than metal;
Graphite raw material has some properties of metals and ceramics, good electrical and thermal conductivity, multi porosity, and small coefficient of thermal expansion. Therefore, graphite has become one of the most heat-resistant and shock-resistant materials;
Vacuum furnace graphite has a small resistance temperature coefficient and low thermal inertia. It can be heated and cooled quickly. It has no special requirements in the process of workpiece treatment. It is more suitable for the application of a vacuum furnace heat generator;
It is a relatively good heating body of a vacuum furnace. Vacuum furnace graphite has the advantages of high-temperature resistance, no deformation, impact resistance, large radiation area, good flexibility, and easy processing and installation. In terms of electricity, it is easy to make large heating elements, which can increase voltage, reduce current and save heat loss.
at room temperature, it is relatively stable and insoluble in water, dilute acid, dilute alkali, and organic solvents;
react and burn with oxygen at different high temperatures to produce carbon dioxide or carbon monoxide;
in halogen, only fluorine can react directly with elemental carbon;
under heating, elemental carbon is easy to be oxidized by acid;
at high temperatures, carbon can also react with many metals to form metal carbides.
Vacuum furnace graphite is not only used to manufacture heating elements and heat shields of vacuum furnaces but also used to manufacture stressed structural parts such as support, material plate, guide rail, bolt, bearing, fan blade, and so on. It is also used in silicon carbide furnaces, graphitization furnaces, and other metallurgical furnaces, resistance furnaces as furnace lining and conductive materials, as well as the impermeable graphite heat exchanger, electronics, metallurgy, chemical industry, steel, and other fields.
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