CN111041268A - Silver-based electric contact material and preparation method thereof - Google Patents

Silver-based electric contact material and preparation method thereof Download PDF

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Publication number
CN111041268A
CN111041268A CN201911375537.5A CN201911375537A CN111041268A CN 111041268 A CN111041268 A CN 111041268A CN 201911375537 A CN201911375537 A CN 201911375537A CN 111041268 A CN111041268 A CN 111041268A
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CN
China
Prior art keywords
silver
contact material
cuo
electric contact
electrical contact
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Pending
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CN201911375537.5A
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Chinese (zh)
Inventor
陈海军
张�林
王宁
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Dongguan Zhengfeng Technology Co Ltd
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Dongguan Zhengfeng Technology Co Ltd
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Priority to CN201911375537.5A priority Critical patent/CN111041268A/en
Publication of CN111041268A publication Critical patent/CN111041268A/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C5/00—Alloys based on noble metals
    • C22C5/06—Alloys based on silver
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/05—Mixtures of metal powder with non-metallic powder
    • 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
    • H01H1/023—Composite material having a noble metal as the basic material
    • H01H1/0233—Composite material having a noble metal as the basic material and containing carbides
    • 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
    • H01H1/023—Composite material having a noble metal as the basic material
    • H01H1/0237—Composite material having a noble metal as the basic material and containing oxides
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
    • C22C2026/002—Carbon nanotubes

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Composite Materials (AREA)
  • Powder Metallurgy (AREA)
  • Contacts (AREA)

Abstract

The invention relates to a silver-based electric contact material and a preparation method thereof, belonging to the field of preparation of silver-based electric contact materials. The silver-based electric contact material comprises the following components in percentage by weight: carbon material 0.05-4%, Ti3AlC20.02-0.1% of CuO, 0.05-0.1% of CuO and the balance of silver; wherein the carbon material consists of graphite and carbon nanotubes in a weight ratio of 2-5: 1. The silver-based electric contact material has excellent mechanical property and conductivity.

Description

Silver-based electric contact material and preparation method thereof
Technical Field
The invention relates to a silver-based electric contact material and a preparation method thereof, belonging to the field of preparation of silver-based electric contact materials.
Background
The electrical contact element is also called a contact or a contact point, plays a role in connecting, disconnecting, conducting and isolating current in high and low voltage electrical appliances, and is one of the key elements of the high and low voltage electrical appliances. The electric contact element is mainly made of electric contact materials, the electric contact materials are key factors influencing the working reliability of a contact system of the switching electric appliance, and the electric contact element has the advantages of good electric conduction, thermal conductivity, arc burning resistance, fusion welding resistance, small electric wear, low and stable contact resistance, no chemical change with a used medium, certain strength, easiness in machining and the like. Silver is a noble metal and has high application value. Silver has excellent electrical conductivity and thermal conductivity, so that the silver becomes an indispensable raw material for the development of current electric contact materials, soldering materials and electronic paste. The electric contact composite material is a key functional material of electrical alloy, is used for high-low voltage switch contacts, and the performance of the electric contact composite material directly influences the technical level of power generation equipment and power transmission and transformation equipment.
Silver-based electrical contact materials are widely used electrical contact materials. Silver has the highest electrical and thermal conductivity and its oxides decompose at very low temperatures, so that there are essentially no oxidation problems. However, silver is too soft, has poor fusion welding and electrical corrosion resistance, and also undergoes polarity transfer. Therefore, the silver alloy formed by adding elements into the silver or the pseudo alloy formed by the silver, the metal and the non-metallic oxide can improve the fusion welding resistance and the electric corrosion resistance of the electric contact material.
Ag-C is a commonly used electrical contact material. Although this material may increase the weld resistance of the contact, the hardness of this material is low and the amount of arc erosion is large.
Disclosure of Invention
The first technical problem to be solved by the invention is to provide an electric contact material with high strength, good electric conductivity and excellent heat conductivity.
The silver-based electric contact material comprises the following components in percentage by weight: carbon material 0.05-4%, Ti3AlC20.02-0.1% of CuO, 0.05-0.1% of CuO and the balance of silver; wherein the carbon material consists of graphite and carbon nanotubes in a weight ratio of 2-5: 1.
Preferably, the silver-based electric contact material consists of the following components in percentage by weight: 2-3% of carbon material and Ti3AlC20.05-0.06% of CuO, 0.08-0.1% of CuO and the balance of silver.
Preferably, the silver-based electrical contact material consists of the following components in percentage by weight: carbon material 3%, Ti3AlC20.06% of CuO, 0.08% of silver and the balance of silver.
Preferably, the carbon material consists of graphite and carbon nanotubes in a weight ratio of 2.5: 1.
The second technical problem to be solved by the invention is to provide a preparation method of the silver-based electric contact material.
The preparation method of the silver-based electric contact material comprises the following steps:
a. mixing carbon material and Ti3AlC2CuO and silver are ball-milled for 1 to 3 hours according to the mixture ratio of the components to prepare powder;
b. and (3) carrying out vacuum hot-pressing sintering on the uniformly mixed powder, wherein the vacuum degree in the furnace is kept lower than 1 x 10 < -2 > Pa in the whole sintering process.
Preferably, in step a, the ball milling is carried out for 2 hours.
Preferably, in the step a, the ball mill adopts a high-energy planetary ball mill, and the used material balls are corundum balls, and the ball-to-material ratio is 20: 1.
Preferably, in the step b, sintering is carried out at the sintering temperature of 700-1000 ℃ for 2-4 h.
More preferably, in step b, the sintering is carried out at a sintering temperature of 1000 ℃ for 4 hours.
The invention has the beneficial effects that:
1. the silver-based electric contact material prepared by the invention has the advantages of high strength, good electric conductivity, excellent heat conductivity and good high-temperature stability.
2. The silver-based electric contact material has simple preparation method and is suitable for industrial production.
Detailed Description
The silver-based electric contact material comprises the following components in percentage by weight: carbon material 0.05-4%, Ti3AlC20.02-0.1% of CuO, 0.05-0.1% of CuO and the balance of silver; wherein the carbon material consists of graphite and carbon nanotubes in a weight ratio of 2-5: 1.
Because the graphite has low hardness, the carbon nano tube is added into the carbonaceous material to partially replace the graphite so as to modify the material, and the addition of the carbon nano tube is beneficial to improving the strength and the corrosion resistance.
Due to Ti3AlC2Has the advantages of high heat conductivity, high electrical conductivity, good high-temperature stability and the like, so that Ti is doped in the material3AlC2The heat conductivity of the silver-based electric contact material can be improved.
The addition of CuO can improve the fusion welding resistance and corrosion resistance of the silver-based electric contact material.
In order to improve the comprehensive performance of the prepared silver-based electric contact material, preferably, the silver-based electric contact material consists of the following components in percentage by weight: 2-3% of carbon material and Ti3AlC20.05-0.06% of CuO, 0.08-0.1% of CuO and the balance of silver.
In order to improve the comprehensive performance of the prepared silver-based electric contact material, preferably, the silver-based electric contact material consists of the following components in percentage by weight: carbon material 3%, Ti3AlC20.06% of CuO, 0.08% of silver and the balance of silver.
In order to improve the comprehensive performance of the prepared silver-based electric contact material, preferably, the carbon material consists of graphite and carbon nano tubes according to the weight ratio of 2.5: 1.
The preparation method of the silver-based electric contact material comprises the following steps:
a. mixing carbon material and Ti3AlC2CuO and silver are ball-milled for 1 to 3 hours according to the mixture ratio of the components to prepare powder;
b. and (3) carrying out vacuum hot-pressing sintering on the uniformly mixed powder, wherein the vacuum degree in the furnace is kept lower than 1 x 10 < -2 > Pa in the whole sintering process.
Preferably, in step a, the ball milling is carried out for 2 hours.
Preferably, in the step a, the ball mill adopts a high-energy planetary ball mill, and the used material balls are corundum balls, and the ball-to-material ratio is 20: 1.
Preferably, in the step b, sintering is carried out at the sintering temperature of 700-1000 ℃ for 2-4 h.
More preferably, in step b, the sintering is carried out at a sintering temperature of 1000 ℃ for 4 hours.
The following examples are provided to further illustrate the embodiments of the present invention and are not intended to limit the scope of the present invention.
Example 1
The raw materials are taken according to the following weight percentage: carbon material 3%, Ti3AlC20.06% of CuO, 0.08% of silver and the balance of silver; wherein the carbon material consists of graphite and carbon nanotubes in a weight ratio of 2.5: 1.
A method of making a silver-based electrical contact material comprising the steps of:
a. mixing carbon material and Ti3AlC2CuO and silver are ball-milled for 2 hours according to the mixture ratio of the components to prepare powder; wherein, the ball mill adopts a high-energy planetary ball mill, and the used material balls are corundum balls, and the ball-material ratio is 20: 1.
b. Carrying out vacuum hot-pressing sintering on the uniformly mixed powder to obtain a silver-based electric contact material; the sintering temperature is 1000 ℃, and the time is 4 hours; wherein the vacuum degree in the furnace is kept lower than 1 x 10 in the whole sintering process-2Pa。
Example 2
The raw materials are taken according to the following weight percentage: carbon material 0.3%, Ti3AlC20.1 percent of CuO, 0.05 percent of CuO and the balance of silver; the carbon material is composed of graphite and carbon nanotubes according to a weight ratio of 2: 1.
A method of making a silver-based electrical contact material comprising the steps of:
a. mixing carbon material and Ti3AlC2CuO and silver are ball-milled for 2 hours according to the mixture ratio of the components to prepare powder; wherein, the ball mill adopts a high-energy planetary ball mill, and the used material balls are corundum balls, and the ball-material ratio is 20: 1.
b. Carrying out vacuum hot-pressing sintering on the uniformly mixed powder to obtain a silver-based electric contact material; the sintering temperature is 1000 ℃, and the time is 4 hours; wherein the vacuum degree in the furnace is kept lower than 1 x 10 in the whole sintering process-2Pa。
Example 3
The raw materials are taken according to the following weight percentage: carbon material 4%, Ti3AlC20.05 percent of CuO, 0.1 percent of CuO and the balance of silver; the carbon material is composed of graphite and carbon nanotubes according to a weight ratio of 5: 1.
A method of making a silver-based electrical contact material comprising the steps of:
a. mixing carbon material and Ti3AlC2CuO and silver are ball-milled for 2 hours according to the mixture ratio of the components to prepare powder; wherein, the ball mill adopts a high-energy planetary ball mill, and the used material balls are corundum balls, and the ball-material ratio is 20: 1.
b. Carrying out vacuum hot-pressing sintering on the uniformly mixed powder to obtain a silver-based electric contact material; the sintering temperature is 1000 ℃, and the time is 4 hours; wherein the vacuum degree in the furnace is kept lower than 1 x 10 in the whole sintering process-2Pa。
The silver contact materials prepared in the above examples 1 to 3 were tested for their properties, and had hardness HB of > 55 and resistivity of < 4.1. mu. omega. cm.

Claims (9)

1. The silver-based electric contact material is characterized by comprising the following components in percentage by weight: carbon material 0.05-4%, Ti3AlC20.02-0.1% of CuO, 0.05-0.1% of CuO and the balance of silver; wherein the carbon material consists of graphite and carbon nanotubes in a weight ratio of 2-5: 1.
2. The silver-based electrical contact material according to claim 1, which is composed of the following components in percentage by weight: 2-3% of carbon material and Ti3AlC20.05-0.06% of CuO, 0.08-0.1% of CuO and the balance of silver.
3. The silver-based electrical contact material according to claim 2, which is composed of the following components in percentage by weight: carbon material 3%, Ti3AlC20.06% of CuO, 0.08% of silver and the balance of silver.
4. The silver-based electrical contact material according to claim 1, wherein the carbon material consists of graphite and carbon nanotubes in a weight ratio of 2.5: 1.
5. The method for preparing a silver-based electrical contact material according to any one of claims 1 to 4, comprising the steps of:
a. mixing carbon material and Ti3AlC2CuO and silver are ball-milled for 1 to 3 hours according to the mixture ratio of the components to prepare powder;
b. carrying out vacuum hot-pressing sintering on the uniformly mixed powder, wherein the vacuum degree in a furnace is kept lower than 1 x 10 in the whole sintering process-2Pa。
6. The method for preparing a silver-based electrical contact material according to claim 5, wherein in the step a, the ball milling is performed for 2 hours.
7. The method for preparing the silver-based electrical contact material according to claim 5, wherein in the step a, the ball milling is carried out by a high-energy planetary ball mill, and the material balls are corundum balls, wherein the ball-to-material ratio is 20: 1.
8. The method for preparing a silver-based electrical contact material according to claim 5, wherein the sintering temperature in step b is 700 ℃ to 1000 ℃ for 2h to 4 h.
9. The method for preparing a silver-based electrical contact material according to claim 8, wherein in the step b, the sintering is performed at a sintering temperature of 1000 ℃ for 4 hours.
CN201911375537.5A 2019-12-27 2019-12-27 Silver-based electric contact material and preparation method thereof Pending CN111041268A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112831682A (en) * 2020-12-31 2021-05-25 四川艾尔法泰克科技有限公司 Composite silver-based electric contact material and preparation method thereof
CN112837949A (en) * 2020-12-31 2021-05-25 四川艾尔法泰克科技有限公司 CuO-loaded carbon nanotube silver-based electric contact material and preparation method thereof
CN112853147A (en) * 2020-12-31 2021-05-28 四川艾尔法泰克科技有限公司 Silver-based electric contact material and preparation method thereof
CN115522093A (en) * 2022-08-24 2022-12-27 苏州银孚新材料有限公司 Composite reinforced silver tungsten carbide graphite electric shock material and preparation method thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1624175A (en) * 2003-12-02 2005-06-08 上海电器科学研究所（集团）有限公司 Electric contact material of carbon nano pipe silver graphite and its preparation process
CN101230429A (en) * 2008-02-05 2008-07-30 贵研铂业股份有限公司 Dispersion strengthening type Ag alloy
CN105624458A (en) * 2016-02-29 2016-06-01 东南大学 Preparation method for Ti3AlC2-strenghted Ag-based electrical contact material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1624175A (en) * 2003-12-02 2005-06-08 上海电器科学研究所（集团）有限公司 Electric contact material of carbon nano pipe silver graphite and its preparation process
CN101230429A (en) * 2008-02-05 2008-07-30 贵研铂业股份有限公司 Dispersion strengthening type Ag alloy
CN105624458A (en) * 2016-02-29 2016-06-01 东南大学 Preparation method for Ti3AlC2-strenghted Ag-based electrical contact material

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112831682A (en) * 2020-12-31 2021-05-25 四川艾尔法泰克科技有限公司 Composite silver-based electric contact material and preparation method thereof
CN112837949A (en) * 2020-12-31 2021-05-25 四川艾尔法泰克科技有限公司 CuO-loaded carbon nanotube silver-based electric contact material and preparation method thereof
CN112853147A (en) * 2020-12-31 2021-05-28 四川艾尔法泰克科技有限公司 Silver-based electric contact material and preparation method thereof
CN115522093A (en) * 2022-08-24 2022-12-27 苏州银孚新材料有限公司 Composite reinforced silver tungsten carbide graphite electric shock material and preparation method thereof

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Application publication date: 20200421