CuO-loaded carbon nanotube silver-based electric contact material and preparation method thereof
阅读说明：本技术 负载CuO碳纳米管银基电接触材料及其制备方法 (CuO-loaded carbon nanotube silver-based electric contact material and preparation method thereof ) 是由 陈海军 张�林 王宁 张勇全 于 2020-12-31 设计创作，主要内容包括：本发明涉及负载CuO碳纳米管银基电接触材料及其制备方法,属于银基电接触材料制备领域。负载CuO碳纳米管银基电接触材料,由以下的重量百分比的组分组成：负载CuO的碳纳米管2～5％,纳米石墨0.02～0.2％,Ti-3AlC-2 0.05～0.1％,余量为Ag；其中,负载CuO的碳纳米管上,CuO的质量分数为5～10％。本发明制得的材料使用寿命长,且制备方法流程短,生产成本低,容易产业化。(The invention relates to a CuO loaded carbon nanotube silver-based electric contact material and a preparation method thereof, belonging to the field of preparation of silver-based electric contact materials. The CuO-loaded carbon nanotube silver-based electric contact material comprises the following components in percentage by weight: 2-5% of CuO-loaded carbon nano tube, 0.02-0.2% of nano graphite and Ti 3 AlC 2 0.05-0.1% of Ag, and the balance of Ag;wherein, the mass fraction of CuO on the CuO-loaded carbon nano tube is 5-10%. The material prepared by the invention has long service life, and the preparation method has short flow, low production cost and easy industrialization.)
1. The CuO-loaded carbon nanotube silver-based electric contact material is characterized by comprising the following components in percentage by weight: 2-5% of CuO-loaded carbon nano tube, 0.02-0.2% of nano graphite and Ti3AlC20.05-0.1% of Ag, and the balance of Ag; wherein, the mass fraction of CuO on the CuO-loaded carbon nano tube is 5-10%.
2. The CuO loaded carbon nanotube silver-based electrical contact material of claim 1, which is characterized by consisting of the following components in percentage by weight: 2.5-4.5% of CuO-loaded carbon nano tube, 0.02-0.1% of nano graphite, and Ti3AlC20.08-0.1% of Ag, and the balance of Ag.
3. The CuO loaded carbon nanotube silver-based electrical contact material of claim 1, which is characterized by consisting of the following components in percentage by weight: 4 percent of CuO-loaded carbon nano tube, 0.1 percent of nano graphite and Ti3AlC20.08 percent and the balance of Ag.
4. The CuO-loaded carbon nanotube silver-based electrical contact material according to any one of claims 1 to 3, wherein the mass fraction of CuO is 8 to 10%.
5. The CuO-loaded carbon nanotube silver-based electrical contact material according to any one of claims 1 to 3, wherein the mass fraction of CuO is 10%.
6. The preparation method of the CuO loaded carbon nanotube silver-based electrical contact material as claimed in any one of claims 1 to 5, which is characterized by comprising the following steps:
a. preparing a CuO-loaded carbon nanotube: adding CuCl2Mixing the carbon nano tube and water, heating to 85-100 ℃, stirring for 0.5-1 h, then adding a sodium hydroxide solution, carrying out solid-liquid separation on the mixed solution after the reaction is completed, and drying the solid; placing the obtained solid at 300-400 ℃ and keeping the temperature for 1.5-5 h to obtain a loadCarbon nanotubes of CuO;
b. loading CuO-loaded carbon nano tube, nano graphite and Ti3AlC2Mixing with Ag, and performing ball milling for 1-3 h to obtain powder;
c. carrying out vacuum hot-pressing sintering on the powder, wherein the vacuum degree in the furnace is lower than 1 multiplied by 10 in the whole sintering process-2Pa。
7. The method for preparing the CuO-loaded carbon nanotube silver-based electrical contact material according to claim 6, wherein in the step b, ball milling is carried out for 3 h.
8. The method for preparing the CuO loaded carbon nanotube silver-based electrical contact material according to claim 6, wherein in the step c, the sintering temperature is 500-800 ℃.
9. The method for preparing the CuO-loaded carbon nanotube silver-based electrical contact material of claim 6, wherein in the step c, the sintering temperature is 550 ℃ and the sintering time is 1 h.
Technical Field
The invention relates to a CuO loaded carbon nanotube silver-based electric contact material and a preparation method thereof, belonging to the field of preparation of silver-based electric contact materials.
Background
The electric contact element is a core component of a high-low voltage switch electric appliance, is responsible for the operations of switching on, segmenting, guiding, isolating and the like of the electric appliance, and the performance of the electric contact element directly influences the overall reliability, stability, accuracy and service life of the conduction operations of the electric appliance, the electron and the like. 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.
The silver/graphite composite material has lower contact resistance and good fusion welding resistance, and is a traditional electric contact material. But the use range of silver and graphite is limited due to the mutual constraints of electric conductivity, thermal conductivity and wear resistance.
The research at present finds that the carbon nano tube is used as a fiber reinforcement and added into the Ag/C electric contact material, so that the hardness, the electric conductivity and the arc corrosion resistance of the contact material can be improved.
When the addition amount of the carbon nano tube is large, the carbon nano tube is easy to agglomerate in the preparation process, and the hardness of the prepared electric contact material is directly influenced.
Disclosure of Invention
The invention solves the first technical problem of providing a silver-based electric contact material with high hardness and better wear resistance.
The CuO-loaded carbon nanotube silver-based electric contact material comprises the following components in percentage by weight: 2-5% of CuO-loaded carbon nano tube, 0.02-0.2% of nano graphite and Ti3AlC20.05-0.1% of Ag, and the balance of Ag; wherein, the mass fraction of CuO on the CuO-loaded carbon nano tube is 5-10%.
In one embodiment, the CuO-loaded carbon nanotube silverThe base electric contact material consists of the following components in percentage by weight: 2.5-4.5% of CuO-loaded carbon nano tube, 0.02-0.1% of nano graphite, and Ti3AlC20.08-0.1% of Ag, and the balance of Ag.
In one embodiment, the CuO-loaded carbon nanotube silver-based electrical contact material is composed of the following components in percentage by weight: 4 percent of CuO-loaded carbon nano tube, 0.1 percent of nano graphite and Ti3AlC20.08 percent and the balance of Ag.
In one embodiment, the CuO-loaded carbon nanotube silver-based electrical contact material has a mass fraction of CuO of 8-10%.
In one embodiment, the silver-based electrical contact material loaded with CuO carbon nanotubes has a mass fraction of CuO of 10%.
The invention solves the second technical problem by providing a preparation method of the CuO-loaded carbon nanotube silver-based electrical contact material.
The preparation method of the CuO-loaded carbon nanotube silver-based electric contact material comprises the following steps:
a. preparing a CuO-loaded carbon nanotube: adding CuCl2Mixing the carbon nano tube and water, heating to 85-100 ℃, stirring for 0.5-1 h, then adding a sodium hydroxide solution, carrying out solid-liquid separation on the mixed solution after the reaction is completed, and drying the solid; placing the obtained solid at 300-400 ℃ and keeping the temperature for 1.5-5 h to obtain a CuO-loaded carbon nanotube;
b. loading CuO-loaded carbon nano tube, nano graphite and Ti3AlC2Mixing with Ag, and performing ball milling for 1-3 h to obtain powder;
c. carrying out vacuum hot-pressing sintering on the powder, wherein the vacuum degree in the furnace is lower than 1 multiplied by 10 in the whole sintering process-2Pa。
In one embodiment, in step b, the ball is milled for 3 hours.
In one embodiment, in step c, the sintering temperature is 500 to 800 ℃.
In one embodiment, in step c, the sintering temperature is 550 ℃ and the sintering time is 1 h.
The invention has the beneficial effects that:
1. according to the invention, CuO is loaded on the carbon nano tube, so that the problem of hardness reduction of an electric contact material caused by agglomeration of the carbon nano tube is reduced, and the problem of loss of CuO in arc erosion is solved.
2. The nano graphite is added into the raw materials, so that the wear resistance of the material can be obviously improved.
3. The material prepared by the method has long service life.
4. The preparation method has the advantages of short flow, low production cost and easy industrialization.
Detailed Description
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.
The invention solves the first technical problem of providing a silver-based electric contact material with high hardness and better wear resistance.
The CuO-loaded carbon nanotube silver-based electric contact material comprises the following components in percentage by weight: 2-5% of CuO-loaded carbon nano tube, 0.02-0.2% of nano graphite and Ti3AlC20.05-0.1% of Ag, and the balance of Ag; wherein, the mass fraction of CuO on the CuO-loaded carbon nano tube is 5-10%.
When the CuO is uniformly distributed in the matrix, the CuO can play a role in strengthening the alloy and improve the strength, hardness, corrosion resistance and fusion welding resistance of the alloy.
The carbon nano tube is added into the Ag-based electric contact material, so that the hardness, the electric conductivity and the arc corrosion resistance of the contact material can be improved.
According to the invention, CuO is loaded on the carbon nano tube, so that the dispersion performance of the carbon nano tube can be improved by 1, the addition of the carbon nano tube can be further improved, and the hardness of the electric contact material can be increased; 2. further improving the arc corrosion resistance of the electric contact material.
The nano graphite is added into the raw materials, so that the wear resistance of the material can be obviously improved.
To further improve the contactThus, a proper amount of Ti is added3AlC2And the stability of the material under the arc erosion is improved.
In one embodiment, the CuO-loaded carbon nanotube silver-based electrical contact material is composed of the following components in percentage by weight: 2.5-4.5% of CuO-loaded carbon nano tube, 0.02-0.1% of nano graphite, and Ti3AlC20.08-0.1% of Ag, and the balance of Ag.
In one embodiment, the CuO-loaded carbon nanotube silver-based electrical contact material is composed of the following components in percentage by weight: 4 percent of CuO-loaded carbon nano tube, 0.1 percent of nano graphite and Ti3AlC20.08 percent and the balance of Ag.
In one embodiment, the CuO-loaded carbon nanotube silver-based electrical contact material has a mass fraction of CuO of 8-10%.
In one embodiment, the silver-based electrical contact material loaded with CuO carbon nanotubes has a mass fraction of CuO of 10%.
The invention solves the second technical problem by providing a preparation method of the CuO-loaded carbon nanotube silver-based electrical contact material.
The preparation method of the CuO-loaded carbon nanotube silver-based electric contact material comprises the following steps:
a. preparing a CuO-loaded carbon nanotube: adding CuCl2Mixing the carbon nano tube and water, heating to 85-100 ℃, stirring for 0.5-1 h, then adding a sodium hydroxide solution, carrying out solid-liquid separation on the mixed solution after the reaction is completed, and drying the solid; placing the obtained solid at 300-400 ℃ and keeping the temperature for 1.5-5 h to obtain a CuO-loaded carbon nanotube;
b. loading CuO-loaded carbon nano tube, nano graphite and Ti3AlC2Mixing with Ag, and performing ball milling for 1-3 h to obtain powder;
c. carrying out vacuum hot-pressing sintering on the powder, wherein the vacuum degree in the furnace is lower than 1 multiplied by 10 in the whole sintering process-2Pa。
The CuO loaded carbon nanotube prepared by the preparation method of the invention is not easy to fall off even in the subsequent ball milling process, thereby ensuring the stable performance of the prepared electric contact material.
In one embodiment, in step b, the ball is milled for 3 hours.
In one embodiment, in step c, the sintering temperature is 500 to 800 ℃.
In one embodiment, in step c, the sintering temperature is 550 ℃ and the sintering time is 1 h.
Examples
a. Preparing a CuO-loaded carbon nanotube: 1.35g of CuCl2Mixing 9.2g carbon nanotube and water, heating to 85 deg.C, stirring for 0.5h, adding sodium hydroxide solution to make Cu2+After the reaction is completed, filtering the mixed solution, washing the precipitate until the washing water is neutral, and drying the solid; placing the obtained solid at 350 ℃ and keeping the temperature for 5 hours to obtain a CuO-loaded carbon nano tube;
b. loading CuO-loaded carbon nano tube, nano graphite and Ti3AlC2Mixing the powder with Ag according to the weight ratio of 4:0.1:0.08:95.82, and carrying out ball milling for 3 hours to obtain powder;
c. carrying out vacuum hot-pressing sintering on the powder, wherein the sintering temperature is 550 ℃, the sintering time is 1h, and the vacuum degree in the furnace in the whole sintering process is lower than 1 multiplied by 10-2Pa to obtain the electric contact material 1.
Comparative example
a. Mixing CuO, carbon nanotube, nano graphite and Ti3AlC2Mixing the powder with Ag according to the weight ratio of 0.32:3.68:0.1:0.08:95.82, and performing ball milling for 3 hours to obtain powder;
b. carrying out vacuum hot-pressing sintering on the powder, wherein the sintering temperature is 550 ℃, the sintering time is 1h, and the vacuum degree in the furnace in the whole sintering process is lower than 1 multiplied by 10-2Pa to obtain the electric contact material 2.
Through detection, under the same test conditions (28V and 40A), the service life of the electric contact material 1 is found to be superior to that of the electric contact material 2, which shows that the electric contact material prepared by the invention has improved arc welding resistance.
And detecting the hardness, wherein the hardness HB of the electric contact material 1 is 2.1 times of that of the electric contact material 2.
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