Preparation process of viscose-based carbon fiber composite material graphite felt and prepared graphite felt

Abstract

The invention discloses a preparation process of a viscose-based carbon fiber composite material graphite felt, and relates to the technical field of graphite felts. The preparation process comprises the following steps of 1, pre-oxidizing a viscose-based white felt to prepare a carbon fiber pre-oxidized felt, soaking the carbon fiber pre-oxidized felt in a 1% diammonium hydrogen phosphate solution, then performing drying, and performing heating treatment in a pre-oxidation furnace to obtain a pre-oxidized felt; 2, treating the pre-oxidized felt by a continuous pre-treatment furnace at the treatment temperature of 630-650 DEG C to obtain a viscose-based carbon fiber pre-treated felt; and 3, treating the pre-treated felt by a continuous carbonization and graphitization furnace to prepare the viscose-based carbon fiber graphite felt, wherein the treatment temperature is 1900-2400 DEG C. The process has the beneficial effects that the raw materials which are treated by the pretreatment process and then integrally produced by the continuous carbonization and graphitization furnace can obtain higher yield and higher width, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of graphite felt, in particular to a preparation process of graphite felt as a viscose-based carbon fiber composite material and the prepared graphite felt. Background technique [0002] Viscose-based carbon fiber is a fibrous carbon material and an excellent carbon reinforcement material for both military and civilian purposes. Viscose-based carbon fiber thermal insulation material is woven from viscose fiber. It has low density, corrosion resistance, high temperature resistance, fatigue resistance, low thermal expansion coefficient, and good flexibility. It can be wrapped to achieve thermal insulation. It can be used in a high temperature environment of 2800 ℃, and has great market potential in the use of metallurgy, photovoltaic and other equipment. [0003] Viscose-based carbon fibers can be combined with resins to prepare cured hard felts of different shapes and sizes through compression molding. The c...

AI Technical Summary

Problems solved by technology

[0004] At present, domestic metallurgy, photovoltaic and other industries have a great demand for thermal insulation materials. The traditional viscose-based graphite soft felt mostly adopts the process route of carbon felt-vacuum sintering-graphite soft felt, which has high production costs, low production efficiency, and products. Obvious slag drop and skirt phenomenon, when used in the photovoltaic industry, the phenomenon of ash drop and slag drop will obviously affect the product quality of monocrystalline silicon, and cannot meet the needs of customers

In terms of performance, the strength of raw materials of viscose-based graphite soft felt in my country is low, the ash content is high, and the needle punching and weaving processes lag far behind foreign countries. Although the use of phosphorus-containing catalysts in China increases the carbon yield of viscose to a certain extent, but There are great hidden dangers in the production process