Rapid preparation method of C/C composite material

Abstract

The invention discloses a rapid preparation method of a C / C composite material and belongs to the technical field of material preparation. The rapid preparation method of the C / C composite material comprises the following steps: 1) preparation of a preform; 2) heat treatment of the preform; 3) preparation of water-based graphite slurry; 4) injection of graphite slurry; 5) recharging of the graphite slurry; 6) preparation of a green body; 7) carbonization treatment; and 8) densification treatment: the C / C porous preform is densified by using one or a combination of more of a chemical gas phasepermeation process, an impregnation-carbonization process and a high temperature hot pressing process. The rapid preparation method of the C / C composite material, disclosed by the invention, has the advantages that graphite powder is uniformly introduced by using a slurry injection method without destroying the bonding strength of the carbon fiber preform; the strength and microstructure uniformity of the material green body is guaranteed on the one hand, the densification time in the later period is greatly shortened on the other hand, the cost is reduced, and the rapid preparation method issuitable for industrial production; by using the water-based graphite slurry, the cost is low and pollution is avoided; and the C / C composite material prepared by using the method has the advantages of high strength, good wear resistance and reliable high temperature performance.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a rapid preparation method of a C / C composite material. Background technique [0002] C / C composite material, that is, carbon fiber reinforced carbon matrix composite material, is a typical high-tech material, with carbon fiber as reinforcement and carbonaceous material as matrix, and has the advantages of both carbon material and fiber reinforced composite material. C / C composite materials have a series of excellent properties such as low density, high specific modulus, high specific strength, low thermal expansion coefficient, high temperature resistance, corrosion resistance and wear resistance, and have been widely used in aerospace, aviation, nuclear energy, chemical industry, machinery and other fields. However, the problems of long preparation period, high cost, complicated manufacturing process and high technical difficulty of C / C composite mater...

AI Technical Summary

Problems solved by technology

But in fact, this method still uses long-term CVI and repeated impregnation carbonization to prepare C / C composite materials, which takes about several hundred hours, and does not fundamentally solve the problem of long period in the preparation process. Because of this, larger parts cannot usually be fabricated

[0005] Chinese patent CN 104649701B discloses a method for the preparation of high-strength lightweight carbon / carbon composites, which utilizes pretreated continuous filament carbon fiber winding to make preforms of highly oriented conical C / C composites body, then vacuum impregnation, pressurized carbonization, and then chemical vapor deposition CVD, graphitization, impregnation, and CVD to obtain high-strength and lightweight C / C composite materials, but the subsequent densification procedures are complicated, time-consuming, and costly.

Although the above two methods shorten the preparation cycle, they are poor in the controllability of the material structure, and have high requirements for grouting equipment and molds. Different molds are required to prepare materials of different specifications, which is not conducive to the diversified production of products.

Images