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A kind of max@mom/aon electrical contact reinforcement phase material, composite electrical contact material and preparation method

A technology of electrical contact material and reinforced phase, applied in contacts, circuits, electrical switches, etc., can solve the problems of damaging the electrical conductivity of Ag/MAX composite materials, limiting the industrialization process, etc., and achieves significant silver saving effect and arc resistance. The effect of excellent erosion performance and simple preparation process

Active Publication Date: 2022-08-09
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the A atoms in the MAX phase are prone to interdiffusion with the Ag matrix, and the interface reaction damages the electrical conductivity of the Ag / MAX composite material, which has a certain gap with commercial Ag / CdO, which limits its industrialization process.

Method used

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  • A kind of max@mom/aon electrical contact reinforcement phase material, composite electrical contact material and preparation method
  • A kind of max@mom/aon electrical contact reinforcement phase material, composite electrical contact material and preparation method
  • A kind of max@mom/aon electrical contact reinforcement phase material, composite electrical contact material and preparation method

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Experimental program
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Effect test

preparation example Construction

[0035] The preparation method of the electrical contact enhancement phase material, specifically, in a controlled atmosphere, the precursor MAX phase material is oxidized and pre-oxidized on its surface to form oxide particles MO in situ. m , AO n or complex oxide layer MO m / AO n , forming MAX@MO m / AO n .

[0036] In situ generation of oxide particles MO on its surface by pre-oxidizing the parent MAX material m , AO n or complex oxide layer MO m / AO n , can be completed at a lower temperature, low requirements for equipment, good repeatability, simple technology, low cost, obvious practical application value, and the shell MO m / AO n The integrated structure with the core MAX has stronger binding force, strong barrier interface diffusion ability, and better overall composite material performance.

[0037] Specifically, the preparation method of the electrical contact reinforcement phase material includes the following steps:

[0038] S1: Weigh the MAX phase powder...

Embodiment 1

[0056] 10gTi 3 SiC 2 The powder was placed in a high-temperature tube furnace, heated to 1200°C at a heating rate of 10°C / min in an atmosphere of "oxygen + argon" with an oxygen content of 20vol%, maintained for 0.5 hours, and cooled at a cooling rate of 10°C / min to room temperature to obtain core-shell Ti 3 SiC 2 @TiO 2 Powder; will account for 3% Ti by mass fraction of the overall material 3 SiC 2 @TiO 2 The powder and Ag powder with a mass fraction of 97% were wet mixed for 0.5 hours in a ball mill tank equipped with an ethanol medium (the mass ratio of powder:ethanol:balls was 1:1:2), and then dried for 1 hour to obtain the mixed powder; The powder was pressed in a cold press at a pressure of 900 MPa and held for 15 minutes; the block sample was placed in a tube furnace, heated to 500 °C at a heating rate of 2 °C / min under the protection of an Ar atmosphere, and kept for 8 hours. That is to get Ag / Ti 3 SiC 2 @TiO 2 Composite electrical contact material.

[0057]...

Embodiment 2

[0059] 10gTi 3 AlC 2 The powder was placed in a high-temperature tube furnace, heated to 700°C at a heating rate of 2°C / min in an "oxygen + argon" atmosphere with an oxygen content of 80 vol%, kept for 5 hours, and cooled at a cooling rate of 5°C / min to room temperature to obtain core-shell Ti 3 AlC 2 @TiO 2 / Al 2 O 3 Powder; will account for 40% of the overall material mass fraction of Ti 3 AlC 2 @TiO 2 / Al 2 O 3 The powder and the Ag powder with a mass fraction of 60% were wet-mixed in a ball mill tank equipped with an ethanol medium for 8 hours (the mass ratio of powder: ethanol: balls was 1: 3: 6), and then dried for 5 hours to obtain the mixed powder; The powder was pressed in a cold press at a pressure of 50 MPa and held for 1 minute; the block sample was placed in a tube furnace, heated to 900 °C at a heating rate of 16 °C / min under the protection of Ar atmosphere, and kept for 0.5 hours. That is to get Ag / Ti 3 AlC 2 @TiO 2 / Al 2 O 3 Composite electrical...

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Abstract

The invention discloses a MAX@MO m / AO n Electrical contact reinforcement phase material, composite electrical contact material and preparation method, which are MAX@MO with core-shell structure m / AO n , the inner core is the three-dimensional material MAX phase, and the outer shell is the oxide particle MO corresponding to the inner core MAX phase material m , AO n or complex oxide layer MO m / AO n ; MAX@MO prepared by the present invention m / AO n Ag / MAX@MO prepared as reinforcement phase m / AO n The composite electrical contact material has excellent electrical conductivity, moderate hardness and good workability. It can be processed into various electrical contact shapes according to actual application requirements. It has excellent arc erosion resistance and significant silver saving effect. The reinforced phase in the Ag matrix is ​​MAX. @MO m / AO n The content accounts for up to 40wt% of the composite material; the preparation process is simple, the practicability is good, it is suitable for mass production, and is suitable for low-voltage switchgear such as contactors, circuit breakers, relays, etc., bringing social and economic value.

Description

technical field [0001] The invention relates to the technical field of composite electrical contact materials, in particular to a MAX@MO m / AO n Electrical contact reinforcing phase material, composite electrical contact material and preparation method. Background technique [0002] Low-voltage electrical contact materials are an important field of application of electrical alloy materials, and are widely used in control switches such as relays, contactors, circuit breakers, etc. in low-voltage power distribution equipment. At present, the electrical contacts for low-voltage switches are mainly made of Ag / CdO. Although the arc extinguishing characteristics are outstanding, the Cd vapor generated during the service of Ag / CdO is very harmful to the environment and human body. With the increasingly stringent global environmental protection policies, it is urgent to find alternative materials for Cd-free electrical contacts. Existing Cd-free materials Ag / SnO 2 , Ag / ZnO, Ag / N...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H1/0233H01H1/0237H01H11/04C22C5/06C22C32/00C22C1/05
CPCH01H1/0233H01H1/0237H01H11/048C22C5/06C22C32/0005C22C1/05
Inventor 丁健翔张骁查余辉黄培艳陈立明孙正明柳东明张世宏徐东
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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