Preparation method of continuous fiber reinforced ceramic matrix composite screw

Abstract

The invention discloses a preparation method of a continuous fiber reinforced ceramic matrix composite screw. The preparation method comprises the following steps: 1, preparing a screw graphite mold; 2, preparing a screw prefabricated body; 3, preparing an interface layer of the screw; 4, preparing a base body of the screw; and 5, processing the screw. The continuous fiber reinforced ceramic matrix composite screw prefabricated body is firstly prepared, then is placed into the graphite mold and is shaped, an interface layer is deposited through a chemical vapor infiltration method or an infiltration method, and the continuous fiber reinforced ceramic matrix composite matrix is prepared through a precursor dipping-cracking process; and the tail thread of the continuous fiber reinforced ceramic matrix composite screw is directly formed through mold pressing, the shape and size of the screw thread are well controlled, the later machining difficulty is low, the continuous fiber reinforced ceramic matrix composite is free of structural damage in the preparation and machining process, the integrity and continuity of the fiber structure at the thread are guaranteed, damage to the strength of the screw caused by later processing is prevented, and the preparation and processing cost is reduced.

Description

technical field [0001] The invention relates to the technical field of aircraft manufacturing, in particular to a method for preparing a continuous fiber reinforced ceramic matrix composite screw. Background technique [0002] When a hypersonic vehicle re-enters the atmosphere, the surface temperature of the nose cone and flaps is subjected to severe aerodynamic heating. Therefore, the screws used as connecting parts need to have excellent high-temperature mechanical properties and chemical stability. Continuous fiber-reinforced ceramic matrix represented by C / SiC Composite materials have excellent properties such as low thermal conductivity, low density, high specific strength, and high temperature resistance. They are commonly used temperature-resistant materials for hypersonic aircraft thermal protection systems and advanced propellers. Continuous fiber reinforced ceramic matrix composite connecting parts have strong load transfer ability, high reliability and high cost-b...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for preparing a continuous fiber-reinforced ceramic-matrix composite screw, which aims to solve the technical problems of the existing fiber-reinforced ceramic-matrix composite screw, such as high difficulty in processing, thread damage easily caused by the processing process, and discontinuous reinforcing fibers at the thread. , the prepared screw thread shape and size are well controlled, and the post-processing difficulty is low. During the preparation and processing, the continuous fiber-reinforced ceramic matrix composite has no structural damage, which can ensure the integrity and continuity of the fiber structure at the thread, and prevent post-processing damage to the structure. Damage to screw strength

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