Silicon carbide fiber heat treatment roller bed furnace

Abstract

A silicon carbide fiber heat treatment roller bed furnace comprises a conveying roller bed, a feeding roller bed arranged at one end of the conveying roller bed, and a discharging roller bed arrangedat the other end of the conveying roller bed. The conveying roller bed is sequentially provided with a first cleaning transition bin, a non-melting section furnace body, a second cleaning transition bin, a thermo-crosslinking section furnace body and a third cleaning transition bin from the feeding end to the discharging end. Each of the first cleaning transition bin, the second cleaning transition bin and the third cleaning transition bin is provided with at least one gate. The silicon carbide fiber heat treatment roller bed furnace has the advantages that continuous production can be achieved, production efficiency is improved, and energy consumption is reduced.

Description

technical field [0001] The invention relates to silicon carbide fiber heat treatment equipment, in particular to a silicon carbide fiber heat treatment roller furnace. Background technique [0002] At present, the existing domestic production technology of silicon carbide fiber adopts two steps of non-melting treatment process and thermal cross-linking treatment process, which is not suitable for polycarbosilane (PCS) fiber non-melting treatment process and thermal cross-linking treatment in the silicon carbide fiber production process. Continuous production equipment combined with technology. The non-melting treatment process and thermal cross-linking treatment process adopt box-type furnace for heat treatment furnace by furnace. The box-type furnace is not easy to realize automatic loading and unloading production. For the conversion between different processes, manual loading and unloading is used, which cannot realize continuous batch production. Type furnaces need to g...

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Problems solved by technology

The hearth of the existing roller furnace is generally built with refractory materials. The refractory materials are generally light or heavy insulation bricks, ceramic fiber boards, etc. During use, dust will be generated, or tiny particles of bricks will fall, which will affect the box. The cleanliness of the material in the bowl cannot meet the requirements of the polycarbosilane (PCS) fiber treatment process for the production environment

In addition, the existing roller furnace generally adopts a single independent heating element arranged at a certain distance on the upper and lower sides of the furnace. The temperature at the sagger in the furnace is uneven, and in the production process of silicon carbide fiber, the continuous production of the intermediate product polycarbosilane (PCS) fiber non-melting treatment process and thermal cross-linking treatment process requires very high process parameters. The maximum use temperature of non-melting treatment is about 250°C, and the maximum use temperature of thermal crosslinking treatment is about 500°C. Under such low temperature conditions, it is very difficult to achieve temperature uniformity at the sagger in the furnace to ±5°C

Furthermore, in order to improve the temperature uniformity in the furnace of the equipment, the spacing between the heating elements is usually designed to be small, resulting in an increase in the number of elements. When the number of elements is large, it is necessary to install and replace each heating element one by one. more time-consuming

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