Continuous graphitizing ultra-high temperature tube furnace

Abstract

The invention discloses a continuous graphitizing ultra-high temperature tube furnace, whose heating working temperature falls within a range of 2200-2800 DEG C. A structure of the continuous graphitizing ultra-high temperature tube furnace comprises a muffle furnace hearth, a protective tube, a heat insulation refractory layer and a furnace shell. A graphite muffle furnace hearth is tubular, is divided into three temperature areas and is an unique heating body. Water cooling copper electrodes are mounted at two ends of the muffle furnace hearth; the protective tube with an adjusting device is arranged outside the muffle furnace hearth; the protective tube is positioned between the muffle furnace hearth and the heat insulation refractory material; and the axis of the protective tube can be adjusted by the adjusting device. A heat insulation system, which is formed by a soft graphite felt, a soft felt, a carbon/carbon composite material and other materials, is arranged in a furnace body; the airtight furnace shell with a water cooling steel structure is arranged outside the heat insulation system; the water cooling furnace shell comprises a plurality of independent water cooling chambers; and the chambers are respectively used for cooling different areas of the furnace body. The continuous graphitizing ultra-high temperature tube furnace disclosed by the invention has the advantages of high working furnace temperature, uniform and stable temperature field, less muffle furnace hearth surface heat accumulation phenomenon, long muffle furnace hearth service life, simple structure, easiness for machining and so on.

Description

technical field [0001] The invention belongs to the field of high-temperature heating equipment, and is particularly suitable for ultra-high-temperature graphitization treatment of materials, especially carbon fibers, so as to form new materials with high carbon content and graphitization. Background technique [0002] Graphite fiber refers to carbon fiber with a carbon content of more than 99%. Graphite fibers can be obtained from carbon fibers after high-temperature graphitization treatment at 2200-2800 °C. Compared with carbon fiber, graphite fiber not only has high carbon content, but also has high tensile modulus. therefore. Graphite fiber is also called high modulus carbon fiber. In addition, graphite fibers also have excellent properties such as small thermal expansion coefficient, good thermal stability, and dimensional stability, so they are used to manufacture rigid, thin, and dimensionally stable composite components, and are widely used in spacecraft and aeros...

AI Technical Summary

Problems solved by technology

[0004] Due to the structure of the carbonization furnace itself, the furnace cavity is made of graphite materials, and a heating body is designed outside the muffle to transfer heat to the furnace through thermal radiation, resulting in multiple heating body wiring ports on both sides of the furnace, which is unfavorable for wiring and sealing while increasing energy consumption

This heating method is also likely to cause uneven temperature field distribution in the furnace, complex structure, and inconvenient manufacturing

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