CN111048339B - Method for manufacturing silver-molybdenum electrical contact with continuous oxidation-resistant layer on surface and product thereof - Google Patents

Method for manufacturing silver-molybdenum electrical contact with continuous oxidation-resistant layer on surface and product thereof Download PDF

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Publication number
CN111048339B
CN111048339B CN201911245922.8A CN201911245922A CN111048339B CN 111048339 B CN111048339 B CN 111048339B CN 201911245922 A CN201911245922 A CN 201911245922A CN 111048339 B CN111048339 B CN 111048339B
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China
Prior art keywords
molybdenum
silver
electrical contact
resistant layer
continuous
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CN201911245922.8A
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CN111048339A (en
Inventor
费家祥
宋振阳
林旭彤
孔欣
郭仁杰
王达武
陈松杨
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Zhejiang Fuda Alloy Materials Technology Co Ltd
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Zhejiang Fuda Alloy Materials Technology Co Ltd
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
    • H01H11/048—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts by powder-metallurgical processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F3/1035—Liquid phase sintering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/20—Carburising
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/60—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using solids, e.g. powders, pastes
    • C23C8/62—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using solids, e.g. powders, pastes only one element being applied
    • C23C8/64—Carburising
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/02—Contacts characterised by the material thereof
    • H01H1/021—Composite material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B22F2003/241—Chemical after-treatment on the surface
    • B22F2003/242—Coating

Abstract

The invention discloses a method for manufacturing a silver-molybdenum electrical contact with a continuous oxidation resistant layer on the surface, which adopts the technical scheme that the method comprises the following steps: (1) processing a continuous oxidation resistant layer by surface physical treatment (2), placing the silver-molybdenum electrical contact processed in the step (1) in a continuous sintering furnace in the atmosphere of carbon monoxide, sintering at 800-950 ℃ for 0.2-8 hours, and then cooling to carbonize molybdenum particles on the surface of the silver-molybdenum electrical contact to obtain molybdenum carbide and form the continuous oxidation resistant layer; or in the step (2), the silver-molybdenum electrical contact treated in the step (1) and carbon powder are mixed together, placed in a continuous sintering furnace in a hydrogen atmosphere, sintered for 0.2-8 hours at the temperature of 800-950 ℃, and then cooled to carbonize molybdenum particles on the surface of the silver-molybdenum electrical contact to obtain molybdenum carbide and form a continuous oxidation resistant layer. According to the silver-molybdenum electric contact prepared by the invention, molybdenum is protected in the continuous surface oxidation resistant layer, and molybdenum particles are prevented from being oxidized during welding or being exposed in hot and humid air to be oxidized.

Description

Method for manufacturing silver-molybdenum electrical contact with continuous oxidation-resistant layer on surface and product thereof
Technical Field
The invention relates to the field of electrical contact material science, in particular to a manufacturing method of a silver-molybdenum electrical contact with a continuous oxidation resistant layer on the surface and a product thereof.
Background
The silver-molybdenum electrical contact produced by adopting the powder metallurgy infiltration process has the characteristics of low resistivity, strong burning resistance and the like due to the good conductivity of silver and the high hardness of molybdenum, and is widely applied to various low-voltage circuit breakers.
The contact material adopts an infiltration process, and the preparation method comprises the following steps: firstly, making framework and silver sheet, then arranging the framework and the silver sheet on a high-temperature resistant plate one by one, and carrying out furnace infiltration. The infiltration temperature is generally 1000-1300 ℃, and the silver sheet is melted and infiltrated into the framework to fill the pores, so as to obtain the compact silver-molybdenum electrical contact.
The inventor finds in experiments that: the surface (except the bottom surface) of the silver-molybdenum electric contact after infiltration is difficult to form a continuous silver layer, even no silver layer exists, and molybdenum particles are exposed on the surface and are easy to be oxidized during welding or oxidized in a damp and hot environment, so that the contact resistance is high, even the phenomenon of non-conduction is caused. Therefore, improvements are needed.
Disclosure of Invention
In order to solve the problems and the defects of the prior art, the invention aims to provide a method for manufacturing a silver-molybdenum electrical contact with a continuous oxidation resistant layer on the surface.
In order to achieve the purpose, the technical scheme of the invention comprises the following steps:
(1) performing surface physical treatment, namely grinding and polishing the silver-molybdenum electrical contact by using a grinding machine and a polishing machine, and then cleaning;
(2) processing a continuous oxidation resistant layer, placing the silver-molybdenum electrical contact treated in the step (1) in a continuous sintering furnace in the atmosphere of carbon monoxide, sintering at 800-950 ℃ for 0.2-8 hours, and then cooling to carbonize molybdenum particles on the surface of the silver-molybdenum electrical contact to obtain molybdenum carbide and form the continuous oxidation resistant layer; or in the step (2), the silver-molybdenum electrical contact treated in the step (1) and carbon powder are mixed together, placed in a continuous sintering furnace in a hydrogen atmosphere, sintered for 0.2-8 hours at the temperature of 800-950 ℃, and then cooled to carbonize molybdenum particles on the surface of the silver-molybdenum electrical contact to obtain molybdenum carbide and form a continuous oxidation resistant layer.
It is further provided that the silver-molybdenum electrical contact of step (1) is prepared by the following steps:
a. uniformly mixing silver powder and molybdenum powder, and pressing into a silver-molybdenum skeleton;
b. and attaching a silver sheet below the silver-molybdenum framework, putting the silver sheet in an infiltration furnace for infiltration in a hydrogen atmosphere, and sintering at the temperature of 1000-1300 ℃ for 0.5-5 hours to ensure that the silver sheet is melted and infiltrated into the silver-molybdenum framework, thereby obtaining the silver-molybdenum electrical contact.
The thickness of the surface continuous oxidation resistant layer is further set to be 2-20 mu m.
The invention also provides the silver-molybdenum electrical contact with the continuous oxidation-resistant layer on the surface, which is prepared by the method.
The invention has the beneficial effects that: the invention provides a method for manufacturing a silver-molybdenum electrical contact with a continuous oxidation-resistant layer on the surface. The method adopts a carbonization process, selects a carbon monoxide atmosphere or a hydrogen atmosphere (under the hydrogen atmosphere, the silver-molybdenum electrical contact needs to be mixed with carbon powder), controls the sintering temperature and time, and carbonizes the molybdenum particles on the surface layer to obtain a continuous layer of the antioxidation layer. The process has the advantages that the main component of the material is AgMo, the conductive performance is good, the temperature rise is lower, the AgMoC surface can well resist oxidation, and the conductive performance is excellent.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the following examples.
The first embodiment is as follows:
preparing an AgMo50 electrical contact product: mixing Ag powder and Mo powder according to the mass ratio of 30:70 to form skeleton powder. And pressing the framework powder into the framework. And (3) arranging the framework below the corresponding Ag sheet, placing the framework in a infiltration furnace, and sintering for 2 hours at 1100 ℃ under the protection of hydrogen atmosphere. And cleaning the product after infiltration to obtain the AgMo50 electrical contact product.
Preparing an AgMo50 electrical contact product with a continuous oxidation resistant layer on the surface: placing the AgMo50 electrical contact in a continuous sintering furnace in the atmosphere of carbon monoxide, sintering for 0.5 hour at 950 ℃, and then cooling to carbonize molybdenum particles on the surface to obtain the AgMo50 electrical contact with a continuous antioxidation layer on the surface.
Example two:
preparing an AgMo40 electrical contact product: mixing Ag powder and Mo powder according to the mass ratio of 40:60 to form skeleton powder. And pressing the framework powder into the framework. Arranging corresponding Ag sheets on the lower row of the framework, placing the framework in an infiltration furnace, and sintering for 1.5 hours at 1200 ℃ under the protection of hydrogen atmosphere. And cleaning the product after infiltration to obtain the AgMo40 electrical contact product.
Preparing an AgMo40 electrical contact product with a continuous oxidation resistant layer on the surface: mixing the AgMo40 electrical contact with carbon powder, placing the mixture in a continuous sintering furnace in hydrogen atmosphere, sintering for 1 hour at 900 ℃, and then cooling to carbonize molybdenum particles on the surface to obtain the AgMo40 electrical contact with a continuous oxidation resistant layer on the surface.
EXAMPLE III
Preparing an AgMo30 electrical contact product: mixing Ag powder and Mo powder according to the mass ratio of 50:50 to form skeleton powder. And pressing the framework powder into the framework. Arranging corresponding Ag sheets on the lower row of the framework, placing the framework in an infiltration furnace, and sintering for 2.5 hours at 1000 ℃ under the protection of hydrogen atmosphere. And cleaning the product after infiltration to obtain the AgMo30 electrical contact product.
Preparing an AgMo30 electrical contact product with a continuous oxidation resistant layer on the surface: mixing the AgMo30 electrical contact with carbon powder, placing the mixture in a continuous sintering furnace in hydrogen atmosphere, sintering for 1.5 hours at 850 ℃, then cooling, and carbonizing the molybdenum particles on the surface to obtain the AgMo30 electrical contact with a continuous oxidation resistant layer on the surface.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.

Claims (4)

1. A method for manufacturing a silver-molybdenum electrical contact with a continuous oxidation resistant layer on the surface is characterized by comprising the following steps:
the method comprises the following steps of (1) carrying out surface physical treatment, namely grinding and polishing a silver-molybdenum electrical contact by using a grinding machine and a polishing machine, and then cleaning the silver-molybdenum electrical contact, wherein the silver-molybdenum electrical contact is prepared by an infiltration process;
step (2) processing a continuous oxidation resistant layer, placing the silver-molybdenum electrical contact treated in the step (1) in a continuous sintering furnace in the atmosphere of carbon monoxide, sintering at 800-950 ℃ for 0.2-8 hours, and then cooling to carbonize molybdenum particles on the surface of the silver-molybdenum electrical contact to obtain molybdenum carbide and form the continuous oxidation resistant layer; or mixing the silver-molybdenum electrical contact treated in the step (1) with carbon powder, placing the mixture in a continuous sintering furnace in a hydrogen atmosphere, sintering the mixture at 800-950 ℃ for 0.2-8 hours, and then cooling the mixture to carbonize molybdenum particles on the surface of the silver-molybdenum electrical contact to obtain molybdenum carbide and form a continuous oxidation resistant layer.
2. The method of manufacturing according to claim 1, wherein: the silver-molybdenum electrical contact in the step (1) is prepared by the following steps:
a. uniformly mixing silver powder and molybdenum powder, and pressing into a silver-molybdenum skeleton;
b. and attaching a silver sheet below the silver-molybdenum framework, putting the silver sheet in an infiltration furnace for infiltration in a hydrogen atmosphere, and sintering at the temperature of 1000-1300 ℃ for 0.5-5 hours to ensure that the silver sheet is melted and infiltrated into the silver-molybdenum framework, thereby obtaining the silver-molybdenum electrical contact.
3. The method of manufacturing according to claim 1, wherein: the thickness of the continuous oxidation resistant layer on the surface is 2-20 mu m.
4. A silver molybdenum electrical contact having a continuous oxidation-resistant layer on the surface thereof, produced by the production method according to any one of claims 1 to 3.
CN201911245922.8A 2019-12-07 2019-12-07 Method for manufacturing silver-molybdenum electrical contact with continuous oxidation-resistant layer on surface and product thereof Active CN111048339B (en)

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CN201911245922.8A CN111048339B (en) 2019-12-07 2019-12-07 Method for manufacturing silver-molybdenum electrical contact with continuous oxidation-resistant layer on surface and product thereof

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CN111048339B true CN111048339B (en) 2022-03-18

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101834070A (en) * 2009-03-13 2010-09-15 上海电科电工材料有限公司 AgWC (wolfram carbide) electrical contact material and manufacturing method thereof
CN110000374A (en) * 2019-04-15 2019-07-12 福达合金材料股份有限公司 A kind of preparation process and products thereof of silver molybdenum contact material
CN110225803A (en) * 2017-02-02 2019-09-10 株式会社明电舍 For manufacturing the method and electrode material of electrode material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101834070A (en) * 2009-03-13 2010-09-15 上海电科电工材料有限公司 AgWC (wolfram carbide) electrical contact material and manufacturing method thereof
CN110225803A (en) * 2017-02-02 2019-09-10 株式会社明电舍 For manufacturing the method and electrode material of electrode material
CN110000374A (en) * 2019-04-15 2019-07-12 福达合金材料股份有限公司 A kind of preparation process and products thereof of silver molybdenum contact material

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