Determination method of carbon fiber pre-oxidized fiber skin-core structure
A skin-core structure, pre-oxygen wire technology, which is used in the preparation of test samples and the use of measurement of secondary emissions for material analysis, etc., can solve the problems of large human factors, large interference of background pixel analysis, and high difficulty in operation.
Active Publication Date: 2014-02-12
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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Problems solved by technology
[0004] The traditional solidified slice electron microscope observation method can only qualitatively characterize the existence of the skin-core structure, and human factors have a great influence. The distinction between the cortex and the core depends entirely on the operator.
Raman spectroscopy calculates the skin-core factor to determine its severity, which largely depends on the determination of the Raman test location, and cannot visually express the boundary between the cortex and the core
The optical density method can also test the fiber skin-core structure, but the method needs to undergo strict ultra-thin section processing with a thickness of about 70nm, and must ensure that the cut surface is flat and free of knife marks. Secondly, the obtained photos need to be analyzed professionally to obtain Data, the overall processing steps are cumbersome, the operation is difficult, and the shooting background interferes greatly with pixel analysis
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Embodiment 1
[0101] In this embodiment, the bulk density is 1.2343 / cm 3 The pre-oxidized wire was cured in the curing agent for 1 hour at room temperature, and then dipped and etched with 98% concentrated sulfuric acid for 10 minutes. The obtained SEM photos are as follows: figure 1 shown. The calculated core ratios are shown in Table 1.
Embodiment 2
[0103] In this embodiment, the bulk density is 1.3240g / cm 3 The pre-oxidized wire was cured in the curing agent for 1 hour at room temperature, and then dipped and etched with 98% concentrated sulfuric acid for 3 minutes. The obtained SEM photos are as follows: figure 2 shown. The calculated core ratios are shown in Table 1.
Embodiment 3
[0105] In this embodiment, the bulk density is 1.3240g / cm 3 The pre-oxidized wire was cured in the curing agent for 1 hour at room temperature, and then dipped and etched with 25% concentrated sulfuric acid for 48 hours. The obtained SEM photos are as follows: image 3 shown. The calculated core ratios are shown in Table 1.
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The invention discloses a determination method of a carbon fiber pre-oxidized fiber skin-core structure. The determination method comprises following steps: erosion of a pre-oxidized fiber is performed using an etching agent, so that holes are formed via erosion in the inner side loose linear structure; and the inner side loose linear structure is observed via a scanning electron microscope (SEM) so as to determine hole diameter and fiber diameter, and quantitative characterization of the structure of the pre-oxidized fiber is realized. Operation of the determination method is simple and convenient; external interference is less; cost is low; determination time is short; quantitative calculation of core ratio can be realized; and influences caused by human factors are avoided.
Description
technical field [0001] The invention relates to the field of carbon fiber material testing. Specifically, the invention relates to a method for measuring the sheath-core structure of carbon fiber pre-oxidized silk. Background technique [0002] Carbon fiber is a high-strength, high-modulus material successfully developed in the 1960s. It is an inorganic polymer fiber with a carbon content of more than 90%. It has excellent properties such as high tensile strength, high modulus, high temperature resistance, wear resistance, corrosion resistance, and fatigue resistance. It is widely used in automobile manufacturing, energy chemical industry, sports, etc. Supplies, aerospace, military development and other fields. [0003] Pre-oxidation is an essential and important link in the carbon fiber preparation process. It acts as a link between the past and the future, transforming the linear molecular chain structure of the PAN precursor into a heat-resistant trapezoidal structure,...
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IPC IPC(8): G01N23/22G01N1/28
Inventor 朱小龙王雪飞管建敏严庆
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI