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Shell-core-structure MXene@MAX composite contact reinforcing phase material and preparation method thereof

A core-shell structure and composite contact technology, which is applied in the direction of electrical components, circuits, electric switches, etc., can solve the problems of inability to strengthen the Ag matrix, find no electrical contact materials, and not Ag/CdO, etc., and achieve arc erosion resistance Excellent performance, moderate hardness and low cost

Active Publication Date: 2020-01-17
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This special layered structure endows it with new characteristics and application potential. The excellent electrical conductivity and ductility make MXene comparable to multi-layer graphene. In MXene, because there is no A atomic layer, its chemical properties are more stable than MAX. In addition, the layered structure similar to multi-layer graphene makes MXene have excellent friction and processing properties. Using MXene as a reinforcing phase for contact materials can greatly improve its electrical conductivity. However, the molecular force between MXene layers Therefore, it cannot have a good reinforcement effect on the Ag matrix; in addition, the relatively thin MXene has a large mass loss under arc erosion
Therefore, although the Ag / MXene composite electrical contact material has good electrical conductivity, it is not the best substitute for Ag / CdO
So far, no suitable electrical contact material has been found that can completely replace Ag / CdO

Method used

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  • Shell-core-structure MXene@MAX composite contact reinforcing phase material and preparation method thereof
  • Shell-core-structure MXene@MAX composite contact reinforcing phase material and preparation method thereof
  • Shell-core-structure MXene@MAX composite contact reinforcing phase material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 10g Ti 3 SiC 2 The powder is added into the HF acid solution with a concentration of 20wt% according to the mass ratio of liquid: solid = 20:1, and stirred at a speed of 50rpm in a magnetic stirrer at a temperature of 30°C for 1 hour; the mixed solution is poured into a centrifuge tube with a size of 10mL In the centrifuge, it was centrifuged at a set speed of 1000rpm for 1 hour, and the centrifuged mixture was placed in a freeze dryer for 1 hour to freeze-dry to obtain Ti with a core-shell structure. 3 SiC 2 @Ti 3 C 2 Powder; Ti will account for 5% by mass of the overall material 3 SiC 2 @Ti 3 C 2 The powder and the Ag powder of mass fraction 95% were wet-mixed 0.5 hour (ball: alcohol: powder material=2:1:1) in the ball mill tank that medium is housed, then dried 2 hours to obtain mixed powder; The press was pressed at a pressure of 800MPa and kept for 10 minutes; the block sample was placed in a sintering furnace, and the temperature was raised to 600°C at a h...

Embodiment 2

[0041] 25g Ti 3 SiC 2 The powder is added into the HF+FLi acid solution with a concentration of 25wt% according to the mass ratio of liquid: solid=30:1, and stirred at a speed of 78rpm in a magnetic stirrer for 1.8 hours at a temperature of 38°C; the mixed solution is poured into a 25mL container In a centrifuge tube, centrifuge at a set speed of 1800rpm for 1.5 hours in a centrifuge, and the centrifuged mixture is placed in a freeze dryer for 1.5 hours to freeze-dry to obtain Ti with a core-shell structure. 3 SiC 2 @Ti 3 C 2 Powder; will account for 8% Ti of the overall material mass fraction 3 SiC 2 @Ti 3 C 2 The powder and the Ag powder of mass fraction 92% were wet-mixed for 1 hour (ball: alcohol: powder = 2.5:1.5:1) in a ball mill tank equipped with a medium, and then dried for 3 hours to obtain a mixed powder; Compress molding with a pressure of 750MPa in a press for 9 minutes; place the block sample in a sintering furnace, N 2 Under atmosphere protection, the t...

Embodiment 3

[0043] 48g Ti 3 SiC 2 The powder is added into the HF acid solution with a concentration of 28wt% according to the mass ratio of liquid:solid=38:1, and stirred at a speed of 90rpm in a magnetic stirrer for 2.5 hours at a temperature of 42°C; the mixed solution is poured into a centrifuge tube with a size of 50mL In the centrifuge, it was centrifuged at a set speed of 2000rpm for 2 hours, and the centrifuged mixture was placed in a freeze dryer for 2 hours to freeze-dry to obtain Ti with a core-shell structure. 3 SiC 2 @Ti 3 C 2 Powder; Ti will account for 10% of the overall material mass fraction 3 SiC 2 @Ti 3 C 2 Powder and the Ag powder of massfraction 90% were wet-mixed 1.5 hours (ball: alcohol: powder material=2.8:2:1) in the ball mill tank that medium is housed, then dried 3.5 hours to obtain mixed powder; Compress molding with a pressure of 700MPa in a press for 8 minutes; place the block sample in a sintering furnace, N 2 Under the protection of the atmosphere,...

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Abstract

The invention discloses a shell-core-structure MXene@MAX composite contact reinforcing phase material and a preparation method thereof. The MXene@MAX composite contact reinforcing phase material is ofa multi-dimensional core-shell structure, an inner core is a MAX-phase material, and the shell is a MXene material corresponding to the MAX-phase material of the inner core. An Ag / MXene@MAX composite contact reinforcing phase material using the MXene@MAX and a preparation method thereof are disclosed. According to the MXene@MAX composite contact reinforcing phase material, after compounding withthe Ag matrix, the three-dimensional MAX plays a role of a supporting structure, the two-dimensional MXene plays the role of conducting electricity and heat and enhancing bonding with an Ag-based interface, the density, the conductivity, the heat conduction and the anti-arc erosion performance of an Ag-based electrical contact are improved, and the surface temperature rise, the contact resistanceand the material loss rate of the electrical contact are reduced.

Description

technical field [0001] The invention belongs to the technical field of composite contact materials, and in particular relates to a core-shell structure MXene@MAX composite contact reinforcement phase material and a preparation method thereof, and an Ag / MXene@MAX composite electrical contact material prepared by using the above reinforcement phase material and its Preparation. Background technique [0002] Low-voltage switches (contactors, circuit breakers, relays, etc.) are widely used in aerospace, rail transit, power transmission and distribution, electronic appliances and other fields. Since the middle and late last century, the electrical contacts for low-voltage switches have been mainly made of Ag-based composite materials. Due to its low resistivity and excellent resistance to arc erosion, universal electrical contacts "Ag / CdO" occupy most of the market for low-voltage electrical appliances. However, with the increasingly stringent global environmental protection po...

Claims

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Application Information

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IPC IPC(8): C22C5/06C22C32/00C22C1/05C22C1/10H01H11/04
CPCC22C1/05C22C5/06C22C32/0052H01H11/04
Inventor 丁健翔孙正明查余辉黄培艳张骁王东
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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