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Preparation method of ceramic-based composite material standard sample with lamination defects

A composite material and delamination defect technology, which is applied in the field of preparation of ceramic matrix composite material delamination defect standard samples, can solve the problems of easy deformation size control of standard samples, etc.

Inactive Publication Date: 2014-07-16
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of easy deformation and difficult size control of defect standard samples prepared by existing methods, the present invention provides a method for preparing ceramic matrix composite layered defect standard samples
Using this method to prepare the delamination defect standard sample will not produce stress to deform and buckle the preset defect, and the decomposition of the preset defect will not lead to the adhesion of the delamination defect, and the delamination defect prepared by this method is easy to identify through non-destructive testing, and can be evaluated The applicability, sensitivity and accuracy of the detection equipment to layered defects, the shape and size of the defects are completely consistent with the designed defects, and the problem of edge warping will not occur

Method used

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  • Preparation method of ceramic-based composite material standard sample with lamination defects
  • Preparation method of ceramic-based composite material standard sample with lamination defects
  • Preparation method of ceramic-based composite material standard sample with lamination defects

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Rectangular delamination defect standard sample.

[0028] (1) Stack 12 layers of 2D [0° / 90°] carbon fiber cloth 1 in sequence;

[0029] (2) Cut a 0.2mm thick PTFE film into a rectangular shape as defect 2. In this embodiment, the placed rectangular defect 2 is 130mm long and 50mm wide;

[0030] (3) Place the PTFE film cut in step (2) on top of the layer of carbon fiber cloth 1 stacked in step (1), and then stack 12 layers of 2D[0° / 90°] carbon fiber cloth in sequence 1;

[0031] (4) Use two porous shaped graphite templates to clamp the above laminated carbon fiber cloth 1 with defects 2, and use relay needle punching to stitch the template and the laminated carbon fiber cloth 1 in the middle. Get a density of 0.6g / cm 3 Carbon fiber preform;

[0032] (5) The obtained carbon fiber preform is deposited by CVD to pyrolyze the C interface layer to obtain a density of 1.6g / cm 3 C / C composite materials; process conditions: deposition temperature 800-900℃, pressure 0.2-0.4kPa...

Embodiment 2

[0037] Example 2: Stepped delamination defect standard sample.

[0038] (1) Stack 12 layers of 2D [0° / 90°] carbon fiber cloth in sequence;

[0039] (2) Cut 0.2mm thick polytetrafluoroethylene film into rectangular shapes of different sizes as defects 2. In this embodiment, the length of the placement defect is 130mm, and the width is 40mm, 50mm, 60mm, 70mm to form a stepped defect. 2.

[0040] (3) Place the defect 2 of the stepped PTFE film cut in step (2) on the layer of carbon fiber cloth 1 stacked in step (1), and then stack 12 layers of 2D[0° / 90 °] Carbon fiber cloth 1;

[0041] (4) Use two porous shaped graphite templates to clamp the above laminated carbon fiber cloth 1 with defects 2, and use relay needle punching to stitch the template and the laminated carbon fiber cloth 1 in the middle. Get a density of 0.6g / cm 3 Carbon fiber preform;

[0042] (5) The obtained carbon fiber preform was deposited by CVD to pyrolyze the C interface layer to obtain a density of 1.6g / cm 3 C / C co...

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Abstract

The invention discloses a preparation method of a ceramic-based composite material standard sample with lamination defects. The preparation method solves the problem that the existing defect standard sample preparation method can cause sample deformation easily and control size difficultly. The preparation method comprises that preparing a carbon fiber perform with Teflon defects, depositing pyrolytic carbon on the carbon fiber perform with Teflon defects by a chemical vapor deposition (CVD) method, carrying out silicon carbide matrix infiltration by a chemical vapor infiltration (CVI) method, and preparing a ceramic-based composite material standard sample with lamination defects. The preparation method of a ceramic-based composite material standard sample with lamination defects has the advantages that stress causing preset defect deformation bending is not produced; preset defect decomposition does not cause lamination defect adhesion; lamination defects of a ceramic-based composite material standard sample obtained by the preparation method can be easily recognized by non-destructive testing; lamination defect test applicability, sensitivity and precision of testing equipment are evaluated; defect shapes and sizes completely fit to them of preset defects; and edge warping is avoided.

Description

Technical field [0001] The invention relates to a preparation method of a standard sample of a composite material layered defect, in particular to a preparation method of a standard sample of a ceramic matrix composite material layered defect. Background technique [0002] Carbon fiber-reinforced silicon carbide ceramic matrix composites (hereinafter referred to as CMCs) have excellent high-temperature mechanical properties, low density, corrosion resistance, wear resistance, etc., and are considered as potential candidates for high-temperature structural components. However, it has heterogeneous, non-compact, and anisotropic structural characteristics, which can easily lead to defects such as delamination, inclusions, pores, and uneven density. [0003] Taking into account the characteristics of CMCs preparation process, it is easy to produce delamination defects inside the carbon cloth laminate. During the use of CMCs materials, the delamination defect will become the weak link ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28
Inventor 梅辉李海青徐振业邓晓东成来飞张立同
Owner NORTHWESTERN POLYTECHNICAL UNIV