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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 delamination defect standard samples of ceramic matrix composite materials, and can solve the problems of easy deformation and size control of standard samples.

Inactive Publication Date: 2012-12-19
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] Embodiment 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 polytetrafluoroethylene film into a rectangular shape as defect 2. In this example, the placed rectangular defect 2 has a length of 130mm and a width of 50mm;

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

[0031] (4) Clamp the above laminated carbon fiber cloth 1 with defect 2 with two porous shaped graphite templates, and sew the template and the laminated carbon fiber cloth 1 in the middle by the relay needling method. Get a density of 0.6g / cm 3 carbon fiber prefabricated body;

[0032] (5) Deposit the pyrolysis C interface layer on the obtained carbon fiber preform by CVD to obtain a density of 1.6g / cm 3 The C / C composite material; the process conditions ...

Embodiment 2

[0037] Embodiment 2: standard sample of ladder-shaped delamination defect.

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

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

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

[0041] (4) Clamp the above laminated carbon fiber cloth 1 with defect 2 with two porous shaped graphite templates, and sew the template and the laminated carbon fiber cloth 1 in the middle by the relay needling method. Get a density of 0.6g / cm 3 carbon fiber prefabricated body;

[0042] (5) Deposit the pyrolyzed C interface layer on the obtained carbon fiber preform by CVD to obtain a...

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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 method for preparing a composite material delamination defect standard sample, in particular to a preparation method for a ceramic matrix composite material delamination defect standard sample. 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, and wear resistance, and are considered to be potential candidate materials for high-temperature structural components. However, it has heterogeneous, non-dense, and anisotropic structural features, which easily lead to defects such as delamination, inclusions, pores, and uneven density. [0003] Considering the characteristics of the CMCs preparation process, delamination defects are easily generated inside the carbon cloth laminate. During the use of CMCs materials, the delamination defect will become the weak link o...

Claims

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Application Information

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Patent Type & Authority Applications(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