Non-woven fabric composite self-lubricating gasket with gradient distribution in thickness direction

Abstract

The invention provides a non-woven fabric composite self-lubricating gasket with gradient distribution in the thickness direction. The gasket comprises three fiber non-woven fabric layers. Filaments of the non-woven fabric layers are randomly distributed in the plane direction, and the three non-woven fabric layers are bonded through thermosetting resin adhesive laying layers. As each non-woven fabric is composed of mesoscopic fibers which are disorderly distributed in the plane direction and is manufactured through the processes such as melting and spinning, the fibers are crossed and bonded,the directions of the fibers are randomly distributed, performance mutation does not exist in all directions in the plane, and mesoscopic fibers in fiber bundles are not prone to continuous breakageand diffusion; in addition, component materials are convenient to adjust and reinforce in the preparation process of the non-woven fabric, the volume content of component fibers can be flexibly adjusted in the spinning manufacturing process of the non-woven fabric, and therefore gradient function adaptation is achieved in the thickness direction, the comprehensive mechanical property of the gasketis improved, and meanwhile the gasket has better self-lubricating performance, tensile and compression resistance and heat conduction performance.

Description

technical field [0001] The invention relates to the technical field of bearings, in particular to a non-woven composite self-lubricating liner with gradient distribution in the thickness direction. Background technique [0002] At present, most aviation self-lubricating gaskets are composite woven gaskets. The woven liner is made of fiber bundles woven into cloth, which is impregnated with colloid and solidified and compounded. The existing woven self-lubricating liner preparation process is: uniformly mixing different fiber bundles into yarns, through weaving, Let the yarn alternately weave in the longitude and latitude directions to form a fiber fabric, apply the impregnating liquid evenly on the fiber fabric, press and solidify to form a self-lubricating pad. From the perspective of application performance, different functions are required in the thickness direction of the liner, such as: the part close to the friction contact surface needs to have good self-lubricating ...

AI Technical Summary

Problems solved by technology

However, for woven liners, only a limited number of weaving structures and component fibers can be changed to form different ratios of component fiber bundles, so as to achieve changes in the mechanical properties of the contact surface, which is not yet well satisfied. Application requirements

And the pad formed by woven weaving will have intersections of fiber bundles in the warp and weft directions, and the fiber bundles at the intersections, from a microscopic point of view, the fiber filaments at the edge are prone to breakage, and as the working conditions continue during use, The local fiber filament breakage at the edge of the fiber bundle is easy to spread continuously to the entire fiber bundle, which seriously affects the performance of the pad; on the other hand, the woven fabric pad is in the plane, and there is anisotropy of tension and compression properties and sudden change of shear performance.

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