Preparation method of silicon carbide fiber reinforced silicon carbide ceramic-based composite material

Abstract

The invention belongs to the field of composite material preparation, and relates to a preparation method of a silicon carbide fiber reinforced silicon carbide ceramic matrix composite material. The method utilizes an automatic numerical control sewing system to realize automatic sewing of a two-dimensional SiC fiber preform, and adopts a precursor infiltration pyrolysis (PIP) process to prepare atwo-dimensional SiC / SiC composite material. By accurately controlling the tension of the suture lines, the laminated SiC fiber woven fabric is successfully sewn by using the SiC fibers. Compared witha conventional manual sewing method, the method can remarkably improve the sewing efficiency, quality and stability of the two-dimensional laminated SiC fiber woven fabric, and greatly reduces the preparation period and cost of the prefabricated body; meanwhile, SiC fibers are introduced between layers of the composite material, so the layering risk in the technological process can be reduced, and the interlayer mechanical property of the two-dimensional SiC / SiC composite material is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of structural composite materials, and relates to a preparation method of silicon carbide fiber-reinforced silicon carbide ceramic-based composite materials. Background technique [0002] Continuous silicon carbide fiber reinforced silicon carbide ceramic matrix composite (SiC / SiC CMC) has low density (only 1 / 3 to 1 / 4 of superalloy), high temperature resistance (maximum service temperature is as high as 1600 ° C), anti-oxidation, With the characteristics of high strength and high modulus, it is currently recognized as one of the most potential thermal structural materials in the aerospace field. [0003] Continuous SiC fibers are in the form of preforms in the CMC as a reinforcement phase. Fibers are generally prefabricated in two-dimensional (2D), two-and-a-half-dimensional (2.5D) or three-dimensional (3D) forms through textile processing methods, and then combined with matrix materials (SiC...

AI Technical Summary

Problems solved by technology

However, due to the high modulus and brittleness of SiC fibers, it is easy to fluff and break during the suture process, making it difficult to suture

At present, the suture thread used in the traditional domestic manual sewing method is generally carbon fiber. Although it can avoid problems such as fuzzing and thread breakage, there are problems such as thermal expansion mismatch between carbon fiber and SiC / SiC CMC components, such as the thermal expansion of T300 carbon fiber. The coefficient is 7.6×10 -6 / K, while SiC fiber is 4.6×10 -6 / K, leading to defects such as thermal mismatch and cracks during the heating-cooling cycle, which will affect the mechanical properties of the final composite material.

Images