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An Observation Method for Microcracks and Holes in Carbon/Carbon Composite Materials

A carbon composite material and micro-crack technology, which is used in material excitation analysis, fluorescence/phosphorescence, preparation of test samples, etc., to achieve the effect of high success rate, mature technology and simple preparation process

Active Publication Date: 2015-09-23
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of fluorescent dyeing technology is basically applied to the observation and labeling of biological samples, but it has not been reported for the observation of inorganic non-metallic materials.

Method used

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  • An Observation Method for Microcracks and Holes in Carbon/Carbon Composite Materials
  • An Observation Method for Microcracks and Holes in Carbon/Carbon Composite Materials

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Experimental program
Comparison scheme
Effect test

Embodiment

[0019] In the first step, the multi-directional braided C / C composite material to be observed is cut into small pieces of 10mm×10mm×10mm, and then put into a mold; the mold is a drum with an inner diameter of 30mm and a height of 20mm;

[0020] In the second step, mix 80ml of bisphenol A epoxy resin and 15ml of ethylenediamine curing agent and stir evenly, and add 0.5g of tetrachlorotetrabromofluorescent agent, then inject it into the mold obtained in the first step, and carry out Curing, after the curing is completed, take out the cured product in the mold; the curing temperature is room temperature, and the curing time is 8 hours.

[0021] The 3rd step, to the lower surface of the cured product that obtains in the 2nd step, promptly the surface that is in contact with the bottom of the mold barrel, first use No. 400 water sandpaper to carry out rough grinding to the sample, the force used is 9N, single point afterburning, and the rotating speed is 200 rpm for 3 minutes. Afte...

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Abstract

The invention relates to an observation method for microcracks and holes in carbon / carbon composite material, and belongs to the technical field of the observation of the carbon / carbon composite material microstructures. The observation method provided by the invention adopts the raw material with low cost, the adopted embedding resin is an epoxy resin, and a fluorescer is a light-emitting fluorescein. The method provided by the invention has the advantages that the preparation process is simple, the preparation process is a common metallic phase sampling flow path, the process is mature, the repeatability is good, the success ratio is high, the observation method is simple, the preparation sample is directly observed under a fluorescence microscope, the luminous position is the distribution and size of holes and cracks of a material, and the observation method is free from material phase interference; the observation method provided by the invention has the advantages that a fluorescent material is utilized as a mark, so that the comparison and observability of the solid material of the cracks and the holes in the carbon / carbon composite material can be improved, and the holes and the cracks are observed under the fluorescence microscope through a simple and convenient method of adding the fluorescer into resin.

Description

technical field [0001] The invention relates to a method for observing microcracks and holes in a carbon / carbon composite material, and belongs to the technical field of microstructure observation of carbon / carbon composite materials. Background technique [0002] Multi-directional braided carbon / carbon composites refer to high-performance carbon / carbon composites obtained through the process of liquid densification with three-dimensional braided carbon fiber integral fabric structure as reinforcement. Composite materials are composed of polyacrylonitrile (PAN)-based carbon fibers in the reinforcing phase, pitch carbon in the matrix phase, and various defects such as holes and microcracks contained in it, and interfaces between different carbon phases. It is a typical material with simple elements and complex microstructures. system. Various microstructural defects such as pores and microcracks, as well as the scale, distribution and location of various interface structures...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64G01N1/28G01N1/32
Inventor 孙银洁李秀涛胡胜泊宋永忠王俊山
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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