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A kind of preparation method of continuous fiber reinforced c/sic ceramic spring

A continuous fiber and ceramic technology, used in spring/shock absorber manufacturing, springs, low internal friction springs, etc., can solve the problems of difficult processing, uneven distribution of carbon layers, uncontrollable thickness, etc., to achieve high efficiency, repeatability, The effect of excellent designability and precise controllability

Active Publication Date: 2022-04-29
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 to go through 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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  • A kind of preparation method of continuous fiber reinforced c/sic ceramic spring
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  • A kind of preparation method of continuous fiber reinforced c/sic ceramic spring

Examples

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preparation example Construction

[0028] 1. Preparation of a spring molding die

[0029] According to the mechanical design parameters required by the spring, a cylindrical ceramic mold which can be opened and closed, has threads all over its body and through holes distributed among the threads is obtained through 3D software design and 3D printing. The design concept of the die is mainly divided into two aspects. On the one hand, in order to ensure the smooth demoulding of the spring and the repeated utilization of the die, the die is divided into three parts along the axial direction, with threads on both sides of the die and through holes distributed among the threads. For easy drawing, the middle die is longer than the other two parts, with no threads on the side and only through holes distributed in a 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 process, the whole die is designed as a hollow cylinder, the threads...

Embodiment 1

[0040] One such as Figure 2 (a) The stiffness of the ceramic matrix composite spring of the present invention reaches 2.254N / mm at room temperature, and still reaches 2.120N / mm in air at 1000℃, with a stiffness retention rate of about 97.6%.

[0041] 1, preparing a spring molding die

[0042] According to the mechanical design manual, design the mechanical design parameters of the spring as shown in Table 1. Through 3D software design and 3D printing, a cylindrical ceramic mold which can be opened and closed, with threads all over the body and through holes distributed among the threads can be obtained. The design concept of the die is mainly divided into two aspects. On the one hand, in order to ensure the smooth demoulding of the spring and the repeated utilization of the die, the die is divided into three parts along the axial direction, with threads on both sides of the die and through holes distributed among the threads. For the convenience of drawing, the middle die is longe...

Embodiment 2

[0048] One such as Figure 2 (b) The stiffness of the ceramic matrix composite spring of the present invention reaches 2.276N / mm at room temperature.

[0049] 1, preparing a spring molding die

[0050] According to the mechanical design manual, design the mechanical design parameters of the spring as shown in Table 1. Through 3D software design and 3D printing, a cylindrical ceramic mold which can be opened and closed, with threads all over the body and through holes distributed among the threads can be obtained. The design concept of the die is mainly divided into two aspects. On the one hand, in order to ensure the smooth demoulding of the spring and the repeated utilization of the die, the die is divided into three parts along the axial direction, with threads on both sides of the die and through holes distributed among the threads. For the convenience of drawing, the middle die is longer than the other two parts, with no threads on the side and only through holes distributed in...

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Abstract

The invention relates to a method for preparing a continuous fiber reinforced C / SiC ceramic spring. A special mold structure is designed, and 3D printing is used to obtain a cylindrical spring that can be opened and closed, with threads on the whole body and through holes distributed between the threads. , divided into three sections along the axial direction, the middle mold is longer than the ceramic mold at both ends; the mold is used to prepare the spring preform, the spring preform is toughened by chemical vapor infiltration, and the spring preform is deposited with SiC matrix and coating. The present invention regulates the shear strength of the spring wire from the design of the carbon fiber weaving structure, and realizes the designability of spring resilience and spring stiffness; the spring resilience is further realized through a uniform and precisely controllable interface layer and coating thickness The controllability of spring stiffness, fatigue resistance, etc.; the stiffness retention rate of the ceramic matrix composite spring prepared in the present invention can be as high as 97.6% at 1000 ° C, specifically related to the treatment of carbon fiber reinforcement, toughening, molding, etc. Mainly used in the field of high temperature sliding seals.

Description

Technical field [0001] The invention belongs to the preparation method of springs, relates to a preparation method of a continuous fiber reinforced C / SiC ceramic spring, and particularly relates to a preparation method of a continuous fiber reinforced ceramic matrix composite material spring with a design braiding structure, which is mainly applied to the field of high-temperature sliding sealing. technical background [0002] Hypersonic aircraft refers to winged or wingless aircraft, such as aircraft, missiles, shells, etc., flying at a speed of more than 5 times the speed of sound. Hypersonic engines, as well as fuselage flaps, flaperons, elevator ailerons, etc., are faced with the problem of dynamic sealing. In order to work with high performance in the whole flight profile with wide speed and altitude, the structure of the inlet (tail nozzle) needs to be constantly adjusted, and the variable geometry inlet scheme is widely adopted in rocket-based combined cycle (RBCC) engines...

Claims

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Application Information

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Patent Type & Authority Patents(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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