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Preparation method of continuous fiber reinforced C/SiC ceramic spring

A continuous fiber, ceramic technology, used in spring/shock absorber manufacturing, springs, low internal friction springs, etc., can solve the problems of high brittleness of ceramic springs, uneven distribution of carbon layers, uncontrollable thickness, etc. The effect of strength, process is simple and clear, and the process is simple and clear

Active Publication Date: 2020-03-31
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Nanjing University of Technology disclosed in Chinese patent CN 102757221A a ceramic spring obtained by mechanical processing of partially stabilized zirconia (PSZ), and disclosed in Chinese patent CN 1472448A a method for toughening the above-mentioned spring by using nanoparticles, but this ceramic The spring is brittle and difficult to process
The National University of Defense Technology disclosed in the Chinese patent CN 102584307A that the spring prefabricated body is prepared by the investment molding process, densified by the precursor conversion process, and the SiC anti-oxidation coating is deposited by the CVD process, and the unidirectional carbon fiber reinforced silicon carbide (1D C / SiC) ceramic matrix composite material spring, but this method needs multiple steps such as carbon fiber impregnation, casting, resin curing and cracking, and investment. Uneven distribution and uncontrollable thickness

Method used

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  • Preparation method of continuous fiber reinforced C/SiC ceramic spring
  • Preparation method of continuous fiber reinforced C/SiC ceramic spring
  • Preparation method of continuous fiber reinforced C/SiC ceramic spring

Examples

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preparation example Construction

[0028] Step 1. Preparation of Spring Forming Mold

[0029] According to the mechanical design parameters required by the spring, a cylindrical ceramic mold that can be opened and closed, with threads all over the body and through holes distributed between the threads is obtained through 3D software design and 3D printing. The mold design concept is mainly divided into two aspects. On the one hand, in order to ensure the smooth release of the spring and the repeated use of the mold, the mold is divided into three parts along the axial direction. The molds on both sides are threaded, and the through holes are distributed between the threads. , the middle part of the mold is longer than the other two parts for the convenience of drawing and pulling. There is no thread on the side, and there are only through holes distributed along the spiral line; on the other hand, in order to ensure the stability of the mechanical parameters of the spring and the adequacy of the deposition proce...

Embodiment 1

[0040] a kind of like figure 2 The ceramic matrix composite spring of the present invention shown in (a) has a stiffness of 2.254N / mm at room temperature, and still reaches 2.120N / mm in air at 1000°C, with a stiffness retention rate of about 97.6%.

[0041] Step 1: Preparation of spring forming mold

[0042] According to the mechanical design manual, design the mechanical design parameters of the spring shown in Table 1, design and 3D print through 3D software to obtain a cylindrical ceramic mold that can be opened and closed, with threads all over the body, and through holes distributed between the threads. The mold design concept is mainly divided into two aspects. On the one hand, in order to ensure the smooth release of the spring and the repeated use of the mold, the mold is divided into three parts along the axial direction. The molds on both sides are threaded, and the through holes are distributed between the threads. , the middle part of the mold is longer than the ...

Embodiment 2

[0048] a kind of like figure 2 The ceramic matrix composite material spring of the present invention shown in (b) has a stiffness of 2.276 N / mm at room temperature.

[0049] Step 1: Preparation of spring forming mold

[0050] According to the mechanical design manual, design the mechanical design parameters of the spring shown in Table 1, design and 3D print through 3D software to obtain a cylindrical ceramic mold that can be opened and closed, with threads all over the body, and through holes distributed between the threads. The mold design concept is mainly divided into two aspects. On the one hand, in order to ensure the smooth release of the spring and the repeated use of the mold, the mold is divided into three parts along the axial direction. The molds on both sides are threaded, and the through holes are distributed between the threads. , the middle part of the mold is longer than the other two parts for the convenience of drawing and pulling. There is no thread on th...

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Abstract

The invention relates to a preparation method of continuous fiber reinforced C / SiC ceramic spring. In the method, a dedicated mold structure is designed to prepare an opening / closing cylindrical ceramic mold, which has threads on the outer surface and through holes distributed in the threads and is divided into three portions axially, wherein the middle portion is longer than the two end portions.A spring preform is produced with the mold, and then chemical vapor infiltration is employed to toughen the spring preform and deposit SiC base substrate and coating. In the invention, from the wovenstructure design of carbon fibers, the shear intensity of spring wire is regulated, so that designability on the resilience force and rigidity of the spring is achieved; by means of the uniform precisely-controllable interface layer and coating thickness, the controllability on resilience force, rigidity and anti-fatigue performance and the like of the spring are further achieved. The ceramic composite material spring can maintain the rigidity by 97.6% at 1000 DEG C. The invention particularly relates to enhancing, toughening and shaping treatment of the carbon fibers. The product is mainly applied to the field of high temperature slide sealing.

Description

technical field [0001] The invention belongs to a method for preparing a spring, and relates to a method for preparing a continuous fiber-reinforced C / SiC ceramic spring, in particular to a method for preparing a continuous fiber-reinforced ceramic-based composite material spring with a designable weaving structure, which is mainly used for high-temperature sliding Seal the field. Background technique [0002] Hypersonic aircraft refers to winged or wingless aircraft, such as aircraft, missiles, artillery shells, etc., flying at a speed exceeding 5 times the speed of sound. Hypersonic engines, fuselage flaps, flaperons, elevator ailerons, etc. are faced with the problem of dynamic sealing. ) structure needs to be constantly adjusted, rocket-based combined cycle (RBCC) and other engines generally adopt the variable geometry inlet scheme; and the variable geometry inlet will increase the complexity of the engine weight and structure, and will also bring sealing, connection, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/565C04B35/622C04B41/87F16F1/02
CPCC04B35/80C04B35/565C04B35/622C04B41/5059C04B41/87F16F1/022F16F1/024F16F2224/0275F16F2226/02C04B2235/5248
Inventor 梅辉毛敏馨赵钰成来飞
Owner NORTHWESTERN POLYTECHNICAL UNIV
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