Preparation method of ceramic matrix composite internal thread

A composite material and ceramic-based technology, which is applied in the field of preparation of internal threads of fiber-reinforced ceramic-based composite materials for connection, can solve problems such as difficult control of machining accuracy, out-of-tolerance thread size, and easy-to-break threads, etc., to reduce thread processing costs , Improve machining accuracy and reduce difficulty

Active Publication Date: 2021-05-07
GONG YI VAN-RES INNOVATION COMPOSITE MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems such as difficulty in controlling the machining precision of internal threads, out-of-tolerance thread dimensions caused by deposited coatings, and easy damage to thread teeth when finishing threads, and to provide a method for preparing internal threads of ceramic matrix composite materials. It starts to process threads at the same time, which greatly improves the processing accuracy, processing efficiency and thread forming rate of threads, reduces the wear rate of diamond tools, and greatly reduces the cost of thread processing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A method for preparing an internal thread of a ceramic matrix composite material, comprising the steps of:

[0042] (1) Prepare the prefabricated body: prepare the prefabricated body according to the component structure; the prefabricated body can be a two-dimensional laminated prefabricated body, and the fibers are carbon fibers;

[0043] The density of the preform is 0.4g / cm 3 ;

[0044] (2) Preparing the interface layer: using CVI technology to deposit the pyrolytic carbon interface layer on the prefabricated body obtained in step (1);

[0045] The pyrolytic carbon interface layer is prepared by carbon source gas using isothermal CVI technology, the deposition temperature of the isothermal CVI technology is 1100°C, the holding time is 5h, the furnace pressure is 10kPa, and the gas flow rate is 15L / min; The carbon source gas is selected from propylene;

[0046] (3) Preparation of low-density fiber-reinforced ceramic matrix composites: the prefabricated body obtaine...

Embodiment 2

[0057] A method for preparing an internal thread of a ceramic matrix composite material, comprising the steps of:

[0058] (1) Preparation of prefabricated body: Prepare the prefabricated body according to the structure of the component; the prefabricated body is a 2.5D acupuncture structure prefabricated body, the fiber is carbon fiber; the density of the prefabricated body is 0.6 g / cm 3 ;

[0059] (2) Preparing the interface layer: using CVI technology to deposit a boron nitride interface layer on the preform obtained in step (1);

[0060] The boron nitride interface layer is prepared by nitrogen source precursor and boron source precursor by isothermal CVI under hydrogen atmosphere: the deposition temperature is 800°C, the furnace pressure is 15kPa, the gas flow rate of nitrogen source and boron source precursor is 500sccm, nitrogen The flow ratio of the boron source to the boron source is 20:1, the flow ratio of the hydrogen to the nitrogen source is 50:1, and the tempera...

Embodiment 3

[0077] A method for preparing an internal thread of a ceramic matrix composite material, comprising the steps of:

[0078] (1) Preparation of prefabricated body: prepare a prefabricated body according to the structure of the component; the prefabricated body can be a 2.5D woven prefabricated body, and the fiber is a silicon carbide fiber; the density of the prefabricated body is 0.55g / cm 3 ;

[0079] (2) Preparing the interface layer: using CVI technology to deposit a boron nitride interface layer on the preform obtained in step (1);

[0080] The boron nitride interface layer is prepared by nitrogen source precursor and boron source precursor by isothermal CVI in a hydrogen atmosphere: the deposition temperature is 800°C, the furnace pressure is 30kPa, the gas flow rate of nitrogen source and boron source precursor is 1000sccm, nitrogen The flow ratio of source to boron source is 20:1, the flow ratio of hydrogen to nitrogen source is 100:1, and the temperature is kept for 30 ...

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Abstract

The invention relates to a preparation method of a ceramic matrix composite internal thread. The preparation method comprises the following steps: preparing a preform by using fibers according to a component structure; depositing a pyrolytic carbon interface layer or a boron nitride interface layer by adopting a CVI technology; preparing a ceramic matrix layer through the CVI technology and a PIP technology, and obtaining the fiber reinforced ceramic matrix composite material with the density of 1.45-1.55 g / cm < 3 >; machining an unthreaded hole; densifying the ceramic matrix composite until the density reaches 1.6-1.75 g / cm < 3 >; machining the internal threads, wherein the ceramic-based composite material is densified till the density meets the actual requirement; refining the threads: the surfaces of the threaded holes are coated with phenolic resin, high-temperature carbonization is conducted, and then the threaded holes are filled with graphite paper; depositing a SiC coating through CVD; and cleaning the threaded hole to obtain the product. According to the method, the thread is machined when the material is low in density, the machining precision, the machining efficiency and the thread forming rate of the thread are greatly improved, the abrasion rate of a diamond cutter is reduced, the thread machining cost is greatly reduced, thread protection measures before deposition are added, and the problem that the thread size is out of tolerance due to coating deposition can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of internal thread processing and preparation, and in particular relates to a method for preparing an internal thread of a fiber-reinforced ceramic matrix composite material for connection. Background technique [0002] Ceramic matrix composites have the advantages of high temperature resistance, wear resistance, ablation resistance, high specific strength / specific modulus, good oxidation resistance, and good structural design. They are used to prepare screws, pins, studs and other connecting parts, replacing Some superalloys are used to connect high temperature resistant structural parts in aerospace. However, due to the high hardness and high brittleness of the ceramic matrix composite material, the thread of the connecting piece is easy to crack when the thread is processed, the tool wears seriously, and the processing cost is high. [0003] Chinese patent CN 107052476A discloses a low-damage processing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/583C04B35/571B28D1/18C04B35/80C04B41/89C04B41/91
CPCC04B35/622C04B35/571C04B35/583C04B41/009C04B41/53C04B41/52C04B41/89C04B41/91B28D1/18C04B2235/3826C04B2235/3873C04B2235/602C04B2235/5244C04B2235/5248C04B2235/656C04B2235/6567C04B35/806C04B41/5001C04B41/456C04B41/5059C04B41/4531
Inventor 吴恒张东生潘广镇王成峰姚栋嘉刘喜宗曹伟张相国马美霞王琰
Owner GONG YI VAN-RES INNOVATION COMPOSITE MATERIAL CO LTD
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