Preparation method of hard composite carbon fiber heat insulation material

Abstract

The invention relates to a preparation method of a hard composite carbon fiber heat insulation material, belonging to the technical field of the surface treatment process of heat insulation materials. The preparation method comprises the following steps: (1) soaking a blank made of soft carbon felt into a binding agent mixed with a surfactant, and fully and uniformly stirring; (2) curing the material obtained in the step (1), then coating a layer of antioxidant on the surface of the cured blank and drying; and (3) placing the blank dried in the step (2) into a high-temperature graphitizing furnace, and performing high-temperature graphitizing at the temperature higher than 2200 DEG C to finally obtain the high-performance hard composite carbon fiber heat insulation material. According to the preparation method disclosed by the invention, the binding agent and the carbon felt are mixed fully, the interlayer viscosity of the carbon felt can be enhanced, inter-layer shearing strength and anti-oxidation performance are improved, and the degree of graphitizing is higher and fuller; moreover, volatile substances can be effectively prevented from invading the inner layer of a graphite felt and the service life is further prolonged.

Description

technical field [0001] The invention belongs to the technical field of surface treatment technology for thermal insulation materials, and in particular relates to a method for making a hard composite fiber thermal insulation material. Background technique [0002] At present, with the continuous development of the vacuum furnace industry, especially the large demand for single crystal furnaces and polycrystalline furnaces in the solar energy industry, the hard graphite felt produced by the existing technology cannot meet its use requirements. A high-quality high-temperature , High-purity, high-strength rigid graphite insulation felt has become an urgent need for vacuum furnace application companies. [0003] The insulation materials used in traditional high-temperature vacuum furnaces mostly use carbon fiber soft felt, which must be attached to a certain steel structure support (carbon felt frame). When the temperature exceeds 1500 ° C, the temperature of the carbon felt fra...

AI Technical Summary

Problems solved by technology

[0014] 1. Insufficient impregnation, forming agent on the surface of the original felt, but uneven inside;

[0015] 2. The formed hard composite felt is easy to delaminate during use, the combination is not reliable, and the bending strength is low, most of which are below 4.5MPa;

[0016] 3. Limited by the equipment, the temperature is too low and the graphitization is not complete

[0017] 4. Without surface coating treatment, it is easy to oxidize at low temperature