Preparation method of reinforced carbon-based composite material of carbon foam preform

Abstract

A preparation method of reinforced carbon-based composite material of carbon foam preform includes the following steps: (1) stirring phenolic resin, surfactant, foaming agent and curing agent according to the mixture rate, namely the mass percent of 100:5:5:25, then adding chopped carbon fiber accounting for 3-15wt.% of the total weight to be mixed with the materials, and after uniform dispersion,putting the mixture in a baking oven that is preheated to 80-100 DEG C to be heated, foamed and solidified, thus obtaining phenolic foam with reinforced carbon fiber; (2) putting the phenolic foam with reinforced carbon fiber obtained in step (1) in a vacuum carbonization furnace, heating the phenolic foam to the temperature of 900-1, 000 DEG C at the heating rate of 10-20 DEG C / h under 1-2Pa lowvacuum and preserving the heat for 2-3h to obtain the carbon foam preform with reinforced carbon fiber; (3) under the temperature of 1, 000-1050 DEG C and the deposition pressure of 0.5-5kPa, takingnatural gas as a carbon source and nitrogen as carrier gas and adopting CVI technology to conduct compaction for 400-600h; and (4) conducting heat treatment on the material at the high temperature of2, 000-2, 300 for 3-5h after compaction treatment. The material has the advantages of light weight, high strength, low cost, corrosion resistance, resistance to wear, low coefficient of thermal expansion, etc.

Description

technical field

[0001] The invention provides a method for preparing a carbon-based composite material reinforced by a carbon foam prefabricated body, and belongs to the technical field of carbon-based composite materials. Background technique

[0002] Carbon-based composite material is a composite material made of carbon fiber reinforced carbon matrix. Due to its low density, high specific strength and specific modulus, good thermal stability, and the strength increases with the increase of temperature, it has been used in aviation. It has been applied in aerospace, industrial and civil fields. However, due to its complex preparation process, long cycle time, and expensive raw materials, the cost of the product is high, which limits its wider application.

[0003] In order to reduce the preparation cost of carbon-based composites, on the one hand, people have developed a new rapid densification technology, and on the other hand, they have used a new low-cost prefabricated ...