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Preparation method of ceramic matrix composite bolts and pins based on long-rod-shaped prefabricated body structure

A composite material and prefabricated technology, applied in the direction of screws, bolts, nuts, etc., can solve the problems of decreased threaded connection strength, easy broken teeth and other problems, and achieve the effects of short processing time, few weaving processes, and excellent toughness.

Inactive Publication Date: 2021-11-05
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the direction of the fiber reinforcement in the threads of 2D and 3DN bolts depends on the structure of the 2D and 3DN prefabricated body, which causes some of the threads to be easily broken due to the influence of interlayer shear strength, and the remaining threads carry all the load, resulting in a decrease in the thread connection strength.

Method used

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  • Preparation method of ceramic matrix composite bolts and pins based on long-rod-shaped prefabricated body structure
  • Preparation method of ceramic matrix composite bolts and pins based on long-rod-shaped prefabricated body structure
  • Preparation method of ceramic matrix composite bolts and pins based on long-rod-shaped prefabricated body structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] Such as figure 1 As shown, this embodiment prepares C / SiC ceramic matrix composite bolts through the following steps:

[0094] Step 1: Prefabricated body design;

[0095] According to the size requirements of ceramic matrix composite bolts, design the size of its fiber prefabricated body, wherein the fiber prefabricated body is composed of a core structure and a cladding structure, and the core structure is a cylinder formed by multiple fiber bundles arranged in the same direction; The cladding structure is a tubular fiber bundle braided layer wrapped on the outer peripheral surface of the core structure by a braiding method. The core plays the role of fiber strengthening and toughness, and the cladding plays the role of protection and shaping, and is used to process threads. The fibers may be one or more combinations of carbon fibers, silicon carbide fibers, silicon nitride fibers, and the like.

[0096] In this embodiment, for C / SiC ceramic matrix composite bolts w...

Embodiment 2

[0113] Such as figure 1 As shown, this embodiment prepares C / SiC ceramic matrix composite bolts through the following steps:

[0114] Step 1: Prefabricated body design;

[0115] According to the size requirements of ceramic matrix composite bolts, design the size of its fiber prefabricated body, wherein the fiber prefabricated body is composed of a core structure and a cladding structure, and the core structure is a cylinder formed by multiple fiber bundles arranged in the same direction; The cladding structure is a tubular fiber bundle braided layer wrapped on the outer peripheral surface of the core structure by a braiding method. The core plays the role of fiber strengthening and toughness, and the cladding plays the role of protection and shaping, and is used to process threads. The fibers may be one or more combinations of carbon fibers, silicon carbide fibers, silicon nitride fibers, and the like.

[0116] In this embodiment, for a C / SiC ceramic matrix composite bolt ...

Embodiment 3

[0133] In this example, a C / SiC ceramic matrix composite pin is prepared through the following steps:

[0134] Step 1: Prefabricated body design;

[0135] According to the size requirements of ceramic matrix composite pins, design the size of its fiber prefabricated body, wherein the fiber prefabricated body is composed of a core structure and a cladding structure, and the core structure is a cylinder formed by a plurality of fiber bundles arranged in the same direction; The cladding structure is a tubular fiber bundle braided layer wrapped on the outer peripheral surface of the core structure by weaving; the core plays the role of fiber strengthening and toughening, and the cladding plays the role of protection and shaping. The fibers may be one or more combinations of carbon fibers, silicon carbide fibers, silicon nitride fibers, and the like.

[0136] In this embodiment, for a C / SiC ceramic matrix composite pin with a minor diameter of 6 mm and a major diameter of 8 mm, ca...

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Abstract

The invention discloses a preparation method of ceramic matrix composite bolts and pins based on a long-rod-shaped prefabricated body structure, wherein the method is used for solving the problem of non-uniform bearing of 2D and 3DN bolt thread teeth. The method comprises the steps: firstly, designing a fiber prefabricated body into a core body structure formed by bundling unidirectional fibers and a cladding structure formed by weaving fiber bundles; and then determining the number of the fiber bundles of a cladding and a core body, uniformly distributing the unidirectional fiber bundles to form a bundling structure, and binding the bundling structure in the spiral direction by adopting fused glass fibers; 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 prefabricated body to be subjected to compressive stress; sewing the core body and the cladding prefabricated body by adopting the fine fused glass fibers to form a rod-shaped prefabricated body; preparing an interface phase and a ceramic matrix; and finally, processing high-precision threads in a cladding area, preparing a protective coating layer, and thus obtaining a target product. The method is suitable for large-scale low-cost production of the ceramic matrix composite material bolts.

Description

technical field [0001] The invention relates to a preparation method of a ceramic matrix composite material bolt, in particular to a preparation method of a ceramic matrix composite material bolt and a pin based on a long rod-shaped prefabricated body structure. Background technique [0002] The preparation technology of high-temperature resistant complex thin-walled components is an important development direction in the fields of aviation, aerospace engines and internal and external thermal protection systems of aerospace vehicles. Continuous fiber toughened silicon carbide ceramic matrix composites (CMC-SiC, including C / SiC and SiC / SiC) have excellent mechanical properties, such as high specific strength, high specific modulus, high toughness, insensitivity to notch and insensitivity to cracks etc., and can meet the requirements of long life below 1650°C, limited life below 2000°C and instantaneous life below 2800°C, and become the material of choice for high temperature ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/565C04B35/622F16B19/02F16B33/06F16B35/00
CPCC04B35/565C04B35/622F16B35/00F16B19/02F16B33/06C04B2235/386C04B2235/77
Inventor 张毅成来飞李晓萍付志强陈超陈旭卫冲李旭勤
Owner NORTHWESTERN POLYTECHNICAL UNIV
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