WO2017008716A1

WO2017008716A1 - New type of silver-based low-voltage contact material and method for fabrication thereof

Info

Publication number: WO2017008716A1
Application number: PCT/CN2016/089667
Authority: WO
Inventors: 铁生年; 王军; 高梦宇; 梅生伟
Original assignee: 严利容
Priority date: 2015-07-13
Filing date: 2016-07-11
Publication date: 2017-01-19
Also published as: CN105006383B; CN105006383A

Abstract

Provided is a silver-based low-voltage contact material, comprising a graphene material and a metallic silver material filling the graphene material; the volume of said graphene material occupies less than 30% of the total volume of the low-voltage contact material, and the remainder is said metallic silver material. Also provided is a method for fabrication of the described silver-base low-voltage contact material; by means of filling the graphene material with the metallic silver material, a silver/graphene composite contact material is obtained; the low-voltage contact material has the properties of high electrical conductivity, high hardness, low contact resistance, low temperature rise, and good machinablility, and thus has good prospects for application.

Description

Novel silver-based low-pressure contact material and preparation method thereof

Technical field

The invention relates to the technical field of contact materials, in particular to a novel silver-based low-voltage contact material and a preparation method thereof.

Background technique

The contact material is a widely used basic electrical component that bears the task of turning on and off the load circuit current. The quality determines the breaking capability of the low-voltage electrical component and the reliability of the electrical contact circuit. At present, silver-oxide contact materials are widely used in low-voltage electrical appliances. However, in the use of the traditional silver oxide contact material, the contact resistance increases with the increase of the number of breaks, and the temperature rise of the contact material is severe. According to the development requirements of low-voltage electrical appliances and the conditions of use of low-voltage electrical appliances, the ideal development requirements of low-voltage electrical appliances and the use conditions of low-voltage contacts, the ideal low-voltage contact materials must meet the following basic requirements: (1) good electrical conductivity; (2) suitable Hardness; (3) good processing and welding performance; (4) stable contact resistance; (5) excellent arc erosion resistance.

Commonly used low-voltage contact materials are: Ag-CdO, Ag-SnO ₂ , Ag-Ni, etc., but these traditional materials can not meet the development and performance requirements of low-voltage electrical appliances. The Ag-CdO contact material releases toxic Cd vapor during use; the Ag-SnO ₂ contact material has poor wettability of liquid Ag and SnO ₂ particles, and the contact resistance and temperature of the contact material during use of the low-voltage electrical appliance The increase in the weight, the service life of the material is reduced, and the resistance to arc erosion of the Ag-Ni contact material is insufficient.

Summary of the invention

In view of the above, the present invention provides a novel silver-based low-voltage contact material and a preparation method thereof, which has high conductivity, high hardness, low contact resistance, low temperature rise and good processability, and is solved. Problems with the prior art.

In order to achieve the above object, the present invention adopts the following technical solutions:

A novel silver-based low-voltage contact material comprising a graphene material and a metallic silver material filled in the graphene material; wherein the graphene material accounts for less than 30% of the total volume of the low-voltage contact material, The amount is the metallic silver material.

Further, the graphene material has a volume of 5-20% of the total volume of the low-pressure contact material, and the balance is the metal silver material.

Further, the graphene material is prepared by a chemical vapor deposition process, and the number of layers is 1 to 10 layers, and the area is 1 to 2000 μm ² .

Further, the metallic silver material contains one or more of Cu, W, La, or Bi elements, and the volume content thereof is 0.05 to 1% of the total volume of the metallic silver material.

Further, the metal silver material contains one or more of Fe, Ni or Co elements, and the volume content thereof is 0.05 to 0.5% of the total volume of the metal silver material.

The method for preparing a novel silver-based low-pressure contact material as described above, comprising the steps of: S1, preparing the graphene material by a chemical vapor deposition process; S2, heating and melting the metal silver material; S3, melting A bulk metallic silver material is filled into the graphene material to obtain the silver based low pressure contact material.

The effect of the invention is that the silver/graphene composite contact material is obtained by filling the metal silver material into the graphene material, and the electrical conductivity of the contact material is greatly improved due to the excellent electrical conductivity of the graphene; the graphene has high hardness. And the high melting point characteristics, the hardness of the contact material is greatly improved, and at the same time, the problem of insufficient resistance to arc erosion of the low-voltage contact material is solved; in addition, the graphene has excellent deformability, and the plastic deformation ability of the contact material is greatly improved.

detailed description

As described above, the object of the present invention is to solve the problems of the conventional low-voltage contact material, and to provide a novel silver-based low-voltage contact material comprising a graphene material and filling with graphite. a metallic silver material in the olefinic material; wherein the graphene material has a volume of less than 30% of the total volume of the low-pressure contact material, and the balance is the metallic silver material. Among them, a graphene material having a layer number of 1 to 10 layers and an area of 1 to 2000 μm ² is preferred.

The method for preparing the novel silver-based low-pressure contact material comprises the steps of: S1, preparing the graphene material by a chemical vapor deposition process; S2, heating and melting the metal silver material; and S3, forming a molten metal silver material. The silver-based low-pressure contact material is obtained by filling into the graphene material.

Graphene is the hardest material in the world (Young's modulus 1.7TPa), melting point over 2000 ° C, good thermal conductivity (5000 W / (m.k)) and electrical conductivity. At the same time, its unique structure makes it have special properties such as perfect quantum Hall effect, unique quantum tunneling effect and bipolar electric field effect. Due to graphite The olefin has excellent properties, great specific surface area and low production cost (relative to carbon nanotubes), and is very suitable for developing high-performance composite materials. The connection between the carbon atoms of graphene is very flexible. When an external mechanical load is applied, the carbon atom plane is bent and deformed to adapt to the external force without rearranging the carbon atoms, thus maintaining the structural stability. When electrons in graphene move in orbit, they do not scatter due to lattice defects or dopant atoms. Due to the strong interaction between atoms, even in the case of collision between surrounding carbon atoms at normal temperature, the interference of electrons in graphene is very small.

Based on these excellent properties of graphene, a silver/graphene composite contact material is obtained by filling a metallic silver material into a graphene material, and the metal substrate (metal silver material) has excellent electrical conductivity and a second phase reinforcing material (graphite). The high hardness and high melting point of the olefinic material are combined to obtain a silver/graphene composite material with good comprehensive properties. The silver/graphene composite material is used as a low-voltage contact material. Since graphene has excellent electrical conductivity, the electrical conductivity of the contact material is greatly improved; graphene has high hardness and high melting point, and the hardness of the contact material is greatly improved. At the same time, the problem of insufficient resistance to arc erosion of the low-voltage contact material is solved; in addition, the graphene has excellent deformation ability, and the plastic deformation ability of the contact material is greatly improved. Therefore, silver/graphene composites have broad application prospects in the field of low-voltage contact materials.

As one of the embodiments, the graphene material has a volume of 5 to 20% of the total volume of the low-pressure contact material, and the balance is the metal silver material.

As one of the embodiments, the metallic silver material contains one or more of Cu, W, La, or Bi elements in a volume content of 0.05 to 1% by volume of the total volume of the metallic silver material. The metal silver material contains elements such as Cu, W, La, or Bi, which can effectively improve the interfacial bonding between the metallic silver material and the graphene material, and improve the interfacial wettability of the material.

As one embodiment, the metal silver material contains one or more of Fe, Ni or Co elements, and the volume content thereof is 0.05-0.5% of the total volume of the metal silver material. The arc erosion resistance and the anti-weld performance of the low-voltage contact material can be significantly improved.

The technical solutions in the embodiments of the present invention are described in detail below with reference to the specific embodiments. It is obvious that the described embodiments are only a part of the present invention, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Example 1

This embodiment provides a novel silver-based low-pressure contact material comprising a graphene material and a metallic silver material filled in the graphene material. Specifically, the graphene material is first prepared by a chemical vapor deposition process; then the metal silver material is heated and melted and a molten metallic silver material is filled into the graphene material to obtain the silver-based low-pressure contact material. Among them, for the graphene material, a graphene material having a layer number of 1 to 10 layers and an area of 1 to 2000 μm ² is preferred.

In this embodiment, the graphene material accounts for 30% of the total volume of the low pressure contact material, and the metallic silver material accounts for 70% of the total volume of the low pressure contact material. Further, in order to improve the interfacial bonding between the metallic silver material and the graphene material and improve the interfacial wettability of the material, the metallic silver material further contains trace elements such as Cu, W, La, or Bi, which are metals for the elements. The total volume of silver material is about 1%. More specifically, the metallic silver material further contains one or more of Fe, Ni or Co elements, and the volume content thereof is 0.05 to 0.5% of the total volume of the metallic silver material, and these elements can significantly improve the low pressure. The resistance of the contact material to arc erosion and fusion resistance.

The silver-based low-pressure contact material prepared in this embodiment has high conductivity, high hardness, low contact resistance, low temperature rise and good processability compared with the conventional low-voltage contact material, and has good application prospects.

Example 2

This embodiment provides a novel silver-based low-pressure contact material comprising a graphene material and a metallic silver material filled in the graphene material. Specifically, the graphene material is first prepared by a chemical vapor deposition process; then the metal silver material is heated and melted and a molten metal silver material is filled into the graphene material to obtain the silver-based low-pressure contact material. Among them, for the graphene material, a graphene material having a layer number of 1 to 10 layers and an area of 1 to 2000 μm ² is preferred.

In this embodiment, the graphene material has a volume of 20% of the total volume of the low pressure contact material, and the metal silver material accounts for 80% of the total volume of the low pressure contact material. Further, in order to improve the interfacial bonding between the metallic silver material and the graphene material and improve the interfacial wettability of the material, the metallic silver material further contains trace elements such as Cu, W, La, or Bi, which are metals for the elements. The total volume of silver material is about 0.5%. More specifically, the metallic silver material further contains one or more of Fe, Ni or Co elements in a volume content of 0.05 to 0.5% of the total volume of the metallic silver material.

The silver-based low-voltage contact material prepared in this embodiment has the characteristics of high electrical conductivity, high hardness, low contact resistance, low temperature rise and good processability, and has good application prospects.

Example 3

This embodiment provides a novel silver-based low-pressure contact material comprising a graphene material and a metallic silver material filled in the graphene material. Specifically, a graphene material is first prepared by a chemical vapor deposition process; then the metal silver material is heated and melted and a molten metallic silver material is filled into the graphene material to obtain the silver-based low-pressure contact material. Among them, for the graphene material, a graphene material having a layer number of 1 to 10 layers and an area of 1 to 2000 μm ² is preferred.

In this embodiment, the graphene material has a volume of 10% of the total volume of the low pressure contact material, and the metal silver material accounts for 90% of the total volume of the low pressure contact material. Further, in order to improve the interfacial bonding between the metallic silver material and the graphene material and improve the interfacial wettability of the material, the metallic silver material further contains trace elements such as Cu, W, La, or Bi, which are metals for the elements. The total volume of silver material is about 0.05%. More specifically, the metallic silver material further contains one or more of Fe, Ni or Co elements in a volume content of 0.05 to 0.5% of the total volume of the metallic silver material.

The above description is only a specific embodiment of the present application, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present application. It should be considered as the scope of protection of this application.

Claims

A novel silver-based low-pressure contact material, comprising a graphene material and a metallic silver material filled in the graphene material; wherein the graphene material accounts for less than 30% of the total volume of the low-voltage contact material, The balance is the metallic silver material.
The novel silver-based low-pressure contact material according to claim 1, wherein the graphene material has a volume of 5 to 20% of the total volume of the low-pressure contact material, and the balance is the metallic silver material.
The novel silver-based low-pressure contact material according to claim 1, wherein the graphene material is obtained by a chemical vapor deposition process, and has a layer number of 1 to 10 layers and an area of 1 to 2000 μm 2 .
The novel silver-based low-pressure contact material according to claim 1, wherein the metallic silver material contains one or more of Cu, W, La, or Bi elements, and the volume content thereof accounts for the metallic silver. The total volume of the material is 0.05 to 1%.
The novel silver-based low-pressure contact material according to claim 1, wherein the metal silver material contains one or more of Fe, Ni or Co elements, and the volume content thereof accounts for the total volume of the metal silver material. 0.05 to 0.5%.
A method for preparing a novel silver-based low-pressure contact material according to claim 1, comprising the steps of:

S1, obtaining the graphene material by a chemical vapor deposition process;

S2, heating and melting the metal silver material;

S3, filling a molten metal silver material into the graphene material to obtain the silver-based low-voltage contact material.
The method for preparing a novel silver-based low-pressure contact material according to claim 6, wherein the graphene material has a volume of 5 to 20% of the total volume of the low-pressure contact material, and the balance is the metal silver material.
The method for preparing a novel silver-based low-pressure contact material according to claim 6, wherein the graphene material is prepared by a chemical vapor deposition process, and the number of layers is 1 to 10 layers, and the area is 1 to 2000 μm 2 .
The method for preparing a novel silver-based low-pressure contact material according to claim 6, wherein the metallic silver material contains one or more of Cu, W, La, or Bi elements, and the volume content thereof is The total volume of the metallic silver material is 0.05 to 1%.
The method for preparing a novel silver-based low-pressure contact material according to claim 6, wherein the metal silver material contains one or more of Fe, Ni or Co elements, and the volume content thereof accounts for the metal silver. The total volume of the material is 0.05 to 0.5%.