Graphite workpiece hot-pressing rapid forming method

Abstract

The invention discloses a graphite workpiece hot-pressing rapid forming method which comprises the steps of powder mold filling and furnace charging sintering. Wherein the charging sintering specifically comprises the steps of heating and plasticizing, namely, quickly plasticizing graphite powder at a certain heating rate under a specific pressure condition, quickly forming, namely, heating and keeping the temperature for a period of time under the specific pressure condition to complete tight forming of a workpiece, and heating and carbonizing, namely, keeping the temperature for a certain time at a specific temperature to sufficiently carbonize the graphite workpiece; heating and graphitizing, namely keeping the temperature for a certain time under the conditions of specific pressure and temperature to graphitize the workpiece; compared with a traditional mould pressing circulation soaking and baking process, the temperature in a vacuum state is lower than that of a common process, isotropic uniformity is achieved, the sintering, carbonization and graphitization time is short due to different temperature rise heating modes, and the efficiency of the process is high due to the efficient continuity of the whole production; the prepared graphite workpiece is more uniform in material, higher in strength, better in compactness and more stable in performance.

Description

technical field [0001] The invention belongs to the technical field of graphite workpiece processing and preparation, and particularly relates to a graphite workpiece forming method. Background technique [0002] Graphite is widely used in the market, and can be used as high-end molds, graphite bipolar plates, heating elements, graphite linings and other products, with thermal and electrical conductivity; as a mold, it has high strength and high temperature resistance, and has very good Processability. Currently on the market, such as figure 1 The traditional molding cycle dip-baking process shown produces the formed graphite workpiece. This traditional molding cycle dipping and baking process requires multiple dipping and cyclic baking after the graphite workpiece is isostatically pressed to achieve a relatively high density of the graphite workpiece, and then the graphite workpiece is Graphitization of graphite workpieces at a temperature of 2600°C-2800°C not only has a ...

AI Technical Summary

Problems solved by technology

At present, it is generally adopted in the market such as figure 1 The traditional molding cycle dip-baking process shown produces shaped graphite workpieces. This traditional molding cycle dip-baking process requires multiple impregnations and cyclic roasting to achieve relatively high densification of graphite workpieces after isostatic pressing of graphite workpieces. Graphitization of graphite workpieces at 2600°C-2800°C not only has a molding cycle of 6-9 months and high cost, but also the molded graphite workpieces have many interface defects, uneven internal and external structures, loose compactness, poor thermal conductivity and The resistivity is poor, and these defects will become more obvious with the more dipping and firing times

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