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Quantitative detection device and method for interface reaction degree of aluminum-carbon composite material

A carbon composite material and interfacial reaction technology, applied in the direction of measuring devices, material separation, and analysis of materials, can solve problems such as misjudgment, insufficient scale accuracy, and inability to directly observe

Active Publication Date: 2015-09-23
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) Only qualitative or semi-quantitative evaluation can be performed on the interface reaction, but quantitative evaluation cannot be performed;
[0007] (2) When the degree of interface reaction is small, it may be because Al cannot be directly observed 4 C 3 Misjudged by the reaction product;
[0008] (3) During the electrowinning process, Al 4 C 3 The reaction product is partially dissolved, thus due to the observed Al 4 C 3 There is a deviation between the content and the actual situation, resulting in misjudgment;
[0009] (4) For nanocarbon materials such as carbon nanotubes, graphene, and nanodiamonds, the possibility of misjudgment is increased due to insufficient scale accuracy of observations

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] The CNT / Al composites with a mass fraction of 2% were prepared by powder metallurgy process and sintered at 570°C, 600°C, and 630°C for 2h, respectively.

[0069] (1) Cut thin slice samples of a certain size respectively, weigh their quality, and be clamped on the platinum electrode holder 8; open the vacuum mechanical pump 15 (open the third valve 16) before the reaction begins, exhaust the air in the device, wait After the vacuum reaches the requirement, close the vacuum mechanical pump 15 (close the third valve 16); open the auxiliary gas cylinder 1 (open the first valve 3), and feed nitrogen; repeat the operation twice to exhaust the air in the device.

[0070] (2) Open the separatory funnel 11 valves, inject 200mL sodium hydroxide solution into the glass beaker 10; turn on the DC power supply 4, the DC power supply 4 is set to a constant current mode, and the current is set to 2A to start the electrolysis reaction, the gas collection chamber 21 Collect the reaction...

Embodiment 2

[0085] Graphene / Al composites with a mass fraction of 2% were prepared by powder metallurgy process and sintered at 570°C, 600°C, and 630°C for 2h, respectively.

[0086] (1) Cut thin slice samples of a certain size respectively, weigh their quality, and the rod is clamped on the platinum electrode holder 8; open the vacuum mechanical pump 15 before the reaction starts, exhaust the air in the device, and close the vacuum after the vacuum degree reaches the requirement Mechanical pump 15; open the auxiliary gas cylinder 1, feed nitrogen; repeat the operation twice, and exhaust the air in the device.

[0087] (2) Open the valve of the separating funnel 11, inject 200mL of sodium hydroxide solution into the glass beaker 10; turn on the DC power supply 4, set the DC power supply 4 to a constant current mode, and set the current to 2A, start the electrolysis reaction, and collect the reaction to generate gas .

[0088] (3) After the thin slice sample is completely dissolved, turn ...

Embodiment 3

[0101] In order to verify the detection limit of the device of the present invention, a powder metallurgy process was used to prepare a limit sample of CNT / Al and graphene / Al with a mass fraction of 0.5%, and sintered at 640 ° C for 10 h to make carbon nanotubes and graphene react completely into Al 4 C 3 . Cut 0.5g sample and test with device of the present invention, the statistical result after 5 repeated tests is as shown in table 7:

[0102] Table 7 Test results of CNT / Al and graphene / Al extreme samples

[0103] Material

[0104] The present invention utilizes the interface reaction product Al 4 C 3 The principle of the property of being easy to hydrolyze first accelerates the dissolution of the sample to be tested by means of an electrochemical reaction, and then analyzes the Al by gas chromatography. 4 C 3 CH produced by hydrolysis 4 The gas concentration is accurately tested, and the degree of interface reaction is finally calculated; the invention is...

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Abstract

The invention provides a quantitative detection device and a quantitative detection method for the interface reaction degree of an aluminum-carbon composite material. The device comprises a direct current electrolytic reaction generation system, a gas collection system and a gas detection system which are connected with one another in sequence. The theory of the method is that due to the property that an interface reaction product Al4C3 is easy to hydrolyze, dissolving of a sample to be detected is accelerated by virtue of electrochemical reaction, then the gas concentration of CH4 generated by Al4C3 hydrolysis is subjected to precise detection by gas chromatographic analysis, and finally the interface reaction degree is calculated. The device and the method are easy to operate, high in detection and analysis speed, high in precision and suitable for quick and quantitative detection of the interface reaction degree of various carbon material enhanced aluminum-based composite materials such as a carbon nano tube, carbon fibers, graphite, graphite scales, graphite particles, diamonds, and 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 detection device and method for rapidly and quantitatively measuring the reaction degree of aluminum-carbon interface through the combination of 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 applicati...

Claims

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Application Information

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IPC IPC(8): G01N30/02
Inventor 李志强鄢来朋谭占秋范根莲张荻
Owner SHANGHAI JIAO TONG UNIV
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