Quantitative detecting method for interface reaction degree of aluminum-carbon composite material

A quantitative detection method and technology of carbon composite materials, applied in the field of quantitative determination of the degree of carbon/aluminum interface reaction, rapid field, can solve problems such as misjudgment, insufficient scale accuracy, increased misjudgment, etc.

Active Publication Date: 2015-06-03
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main problems of the above test methods are: (1) only qualitative or semi-quantitative evaluation can be performed on the interface reaction, but not quantitative evaluation; (2) when the degree of interface reaction is small, it may be impossible to directly observe the Al 4 C 3 (3) The process of electrolytic extraction will lead to Al 4 C 3 The reaction product is partially dissolved, thus due to the observed Al 4 C 3 (4) For nano-carbon materials such as carbon nanotubes, graphene, and nano-diamonds, the possibility of misjudgment is increased due to insufficient scale accuracy of observations.

Method used

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Experimental program
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Effect test

Embodiment 1

[0040] CNT / Al composites sintered at 570°C, 600°C, and 630°C for 2h were prepared by powder metallurgy process. Thin slice samples of a certain size were cut out respectively, their masses were weighed, and electrodes were prepared. Nitrogen gas was introduced before the reaction started to exhaust the air in the device. The current was set to 2A to start the electrolysis reaction. After the reaction is finished, continue to feed nitrogen, and completely collect the remaining generated gas in the device. After the generated gas was completely collected, 50 mL of CO was injected into the vacuum bag as the calibration gas. Then extract a certain volume of mixed gas for gas chromatographic analysis. The obtained results are shown in Table 1:

[0041] Table 1 Test results of CNT / Al with different degrees of interfacial reaction

[0042] sample

material composition

Sintering conditions

Sample mass

calibration gas

CH 4

CO

Response degree η...

Embodiment 2

[0050] Graphene / Al composites sintered at 570 °C, 600 °C, and 630 °C for 2 h were prepared by powder metallurgy process. Thin slice samples of a certain size were cut out respectively, their masses were weighed, and electrodes were prepared. Nitrogen gas was introduced before the reaction started to exhaust the air in the device. The current was set to 2A to start the electrolysis reaction. After the reaction is finished, continue to feed nitrogen, and completely collect the remaining generated gas in the device. After the generated gas was completely collected, 50 mL of CO was injected into the vacuum bag as the calibration gas. Then extract a certain volume of mixed gas for gas chromatographic analysis. The obtained results are shown in Table 4:

[0051] Table 4 Test results of graphene / Al with different degrees of interfacial reaction

[0052] sample

material composition

Sintering conditions

Sample mass

calibration gas

CH 4

CO

Res...

Embodiment 3

[0060] Diamond / Al composites sintered at 570°C, 600°C, and 630°C for 2h were prepared by powder metallurgy process. Thin slice samples of a certain size were cut out respectively, their masses were weighed, and electrodes were prepared. Nitrogen gas was introduced before the reaction started to exhaust the air in the device. The current was set to 2A to start the electrolysis reaction. After the reaction is finished, continue to feed nitrogen, and completely collect the remaining generated gas in the device. After the generated gas was completely collected, 50 mL of CO was injected into the vacuum bag as the calibration gas. Then extract a certain volume of mixed gas for gas chromatographic analysis. The obtained results are shown in Table 7:

[0061] Table 7 Test results of diamond / Al with different interface reaction degrees

[0062] sample

[0063] 2

[0064] A diamond / Al test sample with a mass of 2 g was taken and dissolved by chemical reaction an...

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Abstract

The invention provides a quantitative detecting method for interface reaction degree of an aluminum-carbon composite material. By utilizing the property that an interface reaction product Al4C3 is easy to hydrolyze, the quantitative detecting method comprises the following steps: firstly, accelerating a to-be-detected sample to be dissolved through electrochemical reaction; then, precisely measuring the concentration of a CH4 gas generated by hydrolyzing Al4C3 through gas chromatography; and finally, calculating the interface reaction degree. The quantitative detecting method is simple to operate, high in detecting and analyzing speed and high in precision, suitable for quickly and quantitatively detecting the interface reaction degree of various carbon material reinforced aluminum-based composite materials including carbon nano tubes, carbon fibers, graphene, graphite flake, graphite particles, diamonds, silicon carbide and the like.

Description

technical field [0001] The invention relates to the technical field of metal matrix composite materials, in particular to a method for rapidly and quantitatively measuring the reaction degree of carbon / aluminum interface by combining electrochemical reaction and gas chromatography analysis. Background technique [0002] The rapid development of automotive, electronics, aviation and military fields has put forward higher application requirements for lightweight, high-strength and multi-functional materials. Various carbonaceous materials such as carbon nanotubes, carbon fibers, graphene, graphite flakes and graphite particles, diamond, silicon carbide, etc. are ideal composite material reinforcements. Various aluminum-carbon materials formed by adding to pure aluminum and aluminum alloy matrix Composite materials, with their high specific strength, high specific modulus, and excellent thermal and electrical conductivity, have broad application prospects in the fields of autom...

Claims

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Application Information

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IPC IPC(8): G01N13/00
Inventor 李志强鄢来朋谭占秋范根莲张荻
Owner SHANGHAI JIAO TONG UNIV
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