Method for preparing carbon/carbon composite material by liquid precursor atomization

Abstract

The invention discloses a method for preparing a carbon / carbon composite material by liquid precursor atomization. The method comprises: a multiple-point pressure spraying device is adopted to inject precursors into a reactor and a precast body in a liquefaction spraying way, and liquid phase-atomization-gasification rapid deposition is carried out, thus obtaining the carbon / carbon composite material with the density of 1.6-1.8g / cm<3>.The invention has the advantages that the liquid precursor boiling gasification link is omitted, the energy consumption is reduced, and the controllability of precursor concentration and feeding is realized, the control and regulation of liquid hydrocarbon precursor amount are easier, the utilization factor of liquid hydrocarbon is greatly improved, the effect is obvious in trial-production, and the carbon / carbon composite material with the density reaching up to 1.8g / cm<3> is prepared in 8 hours successfully.

Description

Technical field: [0001] The invention belongs to the field of composite materials, and relates to a rapid preparation method of composite materials, in particular to a method for preparing carbon / carbon composite materials using liquid precursor atomization as a carbon source. Background technique: [0002] Carbon / carbon composites (C / C, carbon / carbon composites) have been widely used in space shuttle wing leading edges, nose cones, rocket engine nozzles, throat liners, and aircraft brake discs. The role of structural materials and functional components in the aerospace field is irreplaceable. The latest method for preparing carbon / carbon is the chemical liquid-vaporized infiltration (CLVI, or Film boiling CVI, FBCVI), which is the same as the traditional preparation method of carbon / carbon composites. Compared with the liquid phase (resin, pitch) impregnation carbonization method (Chemical vapor infiltration, CVI), the densification rate is the highest, which greatly shortens t...

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Problems solved by technology

[0005] (1) Due to the complexity of the process and the violent boiling-gasification of the liquid flooding body, it is difficult to control and calculate the concentration of the reaction gas during the deposition process, so that the accuracy and rigor of the research results are not high, and the prepared The reproducibility of the product and the industrial production of the process are limited

[0006] (2) Due to the complexity of the boiling-gasification of the liquid precursor, the gas concentration in the deposition chamber is not uniform, which leads to the macrostructure of the prepared carbon / carbon composite material being limited by the shape of the heating element, and most of them are relatively regular shape, it is difficult to meet the requirements for special-shaped carbon / carbon composite components

This process is affected by complex chemical reactions, heat transfer, reaction thermodynamics, fluid mechanics, boiling heat transfer, and joint effects, so the relationship between the microstructure and properties of the prepared carbon / carbon composites and the apparent process parameters is difficult to obtain from a theoretical perspective. It is also very difficult to realize and control the process parameters in actual operation

[0008] (4) From the perspective of energy consumption and efficiency, in order to make the liquid precursor form a continuous gaseous film (ie, film boiling) in the preform and crack the reaction to generate deposited carbon, a huge heating power is required to ensure that the inside of the preform Have a high enough temperature and a very long time, which has caused a lot of waste of electrical energy and liquid precursors

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