Rod-shaped preform with high length-diameter ratio and preparation method of rod-shaped preform

Abstract

The invention discloses a rod-shaped preform with a high length-diameter ratio and a preparation method of the rod-shaped preform, and solves the problem of non-uniform distribution of fiber reinforcements in thread teeth of a ceramic matrix composite bolt based on an existing preform. The preparation method comprises the steps of firstly, designing a fiber preform into a core structure and a cladding structure; and then determining the number of fiber bundles of the cladding and the core, uniformly distributing the unidirectional fiber bundles to form a bundle structure, and binding the bundle structure by adopting fused glass fibers in the spiral direction to form a unidirectional fiber bundle core structure; then weaving a fiber bundle cladding on the surface of the core body by adopting a weaving method so as to enable the core body unidirectional fiber bundle preform to be subjected to the pressure stress of the cladding woven preform; and finally, sewing the core body and the cladding preform by using the fine molten glass fibers to form a rod-shaped preform. According to the prepared novel rod-shaped preform structure with the high length-diameter ratio, uniform distribution of fiber reinforcements in the thread teeth can be achieved, the cladding thread teeth can have more excellent obdurability, and the fiber obdurability of the core body unidirectional fiber bundles can be fully exerted.

Description

technical field [0001] The invention relates to a method for preparing a rod-shaped prefabricated body for ceramic matrix composite material fasteners, in particular to a high aspect ratio rod-shaped prefabricated body with a global load sharing mechanism and a preparation method thereof. Background technique [0002] Ceramic matrix composites have excellent properties such as high temperature resistance, low density, high strength and toughness, pseudoplastic mechanical behavior, notch insensitivity, and no catastrophic damage. They are internationally recognized new thermal structural materials. widely used. With the development of a new generation of aero-engines and high-performance reusable aerospace vehicles, the use of ceramic matrix composites to develop large-scale thin-walled complex thermal structural parts has become the main form of high-performance equipment applications in the future, such as flame tubes, turbine outer rings, and turbine guide vanes. , therma...

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problem that the performance of bolt fasteners prepared based on the existing two-dimensional laminated preform or three-dimensional needle-punched preform is easily affected by the shear direction and the distribution of fiber reinforcements in the thread teeth is uneven, the present invention provides a global The high aspect ratio rod-shaped prefabricated body and its preparation method of the load sharing mechanism, using the high aspect ratio rod-shaped prefabricated body directly as the body of the bolt / pin, not only can remove the grinding process of the outer circle, but also can break through the diameter of the bolt / pin The limitation of plate thickness provides an important idea for the efficient and rapid preparation of larger diameter bolts / pins

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