A light carbon fiber/carbon composite thermal field material and its preparation method

Abstract

The invention provides a lightweight carbon fiber / carbon composite thermal field material with low density, good thermal insulation performance, high purity, high strength and simple and rapid preparation process and its preparation method. The invention creatively uses radiation to induce heat to initiate phenolic condensation Reaction, using radiation cross-linked vinyl compounds to form vinyl cross-linked grafted carbon fiber network, and then triggering phenolic polycondensation reaction to form phenolic cross-linked network by the heat released during the irradiated vinyl cross-linking reaction, and the multi-network cured product is carbonized at high temperature Lightweight carbon fiber / carbon composite thermal field materials are prepared with high efficiency and low energy consumption through graphitization; the obtained lightweight carbon fiber / carbon composite thermal field materials have a bending strength of 3.0MPa and a density of 0.14g / cm 3 , The impurity content can be controlled below 20ppm.

Description

technical field [0001] The invention relates to the technical field of carbon fiber / carbon composite thermal insulation materials, in particular to a lightweight carbon fiber / carbon composite thermal field material and a preparation method thereof. Background technique [0002] Lightweight carbon fiber / carbon composite thermal field materials are widely used in polysilicon ingot furnaces, monocrystalline silicon Czochralski furnaces, Semiconductor crystal growth furnace thermal field, sapphire crystal growth furnace thermal field, optical fiber stretching furnace thermal field and other high temperature thermal fields. [0003] In the existing preparation method of carbon fiber / carbon composite heat field material, the basic preparation process includes: surface treatment of carbon fiber soft felt-impregnation of phenolic resin-molding pressing-high temperature carbonization and graphitization process. The preparation method has the following problems: (1) During the surfac...

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Problems solved by technology

The preparation method has the following problems: (1) During the surface treatment process, the bonding between carbon fiber and phenolic resin is not good, resulting in poor interfacial bonding of the prepared carbon fiber / carbon, resulting in poor mechanical properties; (2) The impregnation process In the process of impregnating carbon fiber soft felt with phenolic resin, alcohol and other solvents need to be added to reduce the viscosity of the resin, so that the carbon fiber and phenolic resin can be fully impregnated, thereby improving the uniformity of impregnation, and then processed by drying. The addition of solvent will cause Environmental pollution; (3) During the pressing process, the carbon fiber felt impregnated with phenolic resin needs to be further formed by pressing and curing. The entire curing process takes more than 10 hours, and the production efficiency is low. At the same time, the heating of the press consumes a lot of energy; (4) In the process of high-temperature carbonization and graphitization, the amount of residual carbon after carbonization using conventional phenolic resin is low, the mechanical properties are low, the mechanical properties caused by interface problems are poor, the solvent pollution problem caused by high viscosity and solvent, high temperature pressing and pressing time The problems of low efficiency and high energy consumption caused by long life and poor mechanical properties caused by low carbon residues need to be solved urgently.

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