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A kind of electric contact and preparation method thereof

A technology of electrical contacts and substrates, which is applied in the field of electrical contacts, can solve the problems of low particle hardness, short on-off life, wear resistance and reduced welding resistance of electrical contact materials, and achieve excellent performance and electrical conductivity Boosts and avoids weak effects

Active Publication Date: 2011-12-21
GUANGZHOU DEPOSON ELECTRIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of technical solution has the following problems: First, under the action of high voltage and high current, this type of electrical contact material is easy to melt and stick, causing serious ablation pits on the contact surface and causing premature failure, which can no longer meet the requirements. Large loads especially under load conditions
However, due to the use of sp higher than 0.6 in this electrical contact 2 / sp 3 Ratio diamond-like nanoparticle preparation, that is, the graphite phase is much larger than the diamond phase, which leads to low hardness of the particles, which greatly reduces the overall mechanical properties of the electrical contact, especially the friction and wear properties, and the wear resistance of the electrical contact material after long-term use The performance and resistance to welding will be greatly reduced, and the on-off life will be short

Method used

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  • A kind of electric contact and preparation method thereof
  • A kind of electric contact and preparation method thereof
  • A kind of electric contact and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0047] This embodiment uses hot wire chemical vapor deposition equipment to prepare nano-diamond films, such as figure 1 As shown, the hot wire chemical vapor deposition equipment includes a deposition chamber 8, a sample stage 7, a hot wire 6 and a bias electrode 5; an air inlet 3 is provided above the deposition chamber 8, and an exhaust port 9 is provided below; the sample The stage 7 is located at the bottom of the deposition chamber 8, the hot wire 6 is located directly above the sample stage 7, and the bias electrode 5 is located directly above the hot wire 6; the bias electrode 5 is connected to the ground A DC power supply 1 is connected between them to apply a bias voltage to the bias electrode 5; a DC power supply 2 is connected between the hot wire 6 and the ground to apply a DC bias voltage to the hot wire 6; between the sample stage 7 and the ground A DC power supply 4 is connected to apply a DC bias voltage to the sample stage 7 .

[0048] Such as figure 2 As ...

Embodiment 2

[0062] The preparation method of the electrical contact of the present embodiment is as follows:

[0063] (1) Preparation of the electrical contact base: In this embodiment, silver (or silver alloy) is used as the base material, and the electrical contact base is prepared by pressure processing.

[0064] (2) Perform auxiliary nucleation treatment on the electrical contact base:

[0065] (2-1) first use hydrochloric acid and nitric acid solution (volume ratio is HCl: HNO 3 =1:1) to clean the substrate, and assist with heating and ultrasonic vibration;

[0066] (2-2) Grinding the substrate with a diamond micropowder solution using an organic solvent as a solvent for 1 min;

[0067] (2-3) Ultrasonic cleaning in ethanol and formaldehyde for 3 minutes in turn, and drying with compressed air.

[0068] (3) Depositing a heavily boron-doped nano-diamond film on the surface of the electrical contact substrate to obtain an electrical contact covered with a nano-diamond film. The speci...

Embodiment 3

[0073] The preparation method of the electrical contact of the present embodiment is as follows:

[0074] (1) Preparation of electrical contact base: In this embodiment, gold (or gold alloy) is used as the base material, and powder metallurgy is used to prepare the electrical contact base.

[0075] (2) Perform auxiliary nucleation treatment on the electrical contact base:

[0076] (2-1) first use hydrochloric acid and nitric acid solution (volume ratio is HCl: HNO 3 =1:1) to clean the substrate, and assist with heating and ultrasonic vibration;

[0077] (2-2) Put the electrical contact matrix into the diamond micropowder solution with methanol as the solvent, and vibrate ultrasonically for 60 minutes;

[0078] (2-3) Ultrasonic cleaning in glycerin and ethanol for 3 minutes in turn, and drying with compressed air.

[0079] (3) Depositing a heavily boron-doped nano-diamond film on the surface of the electrical contact substrate to obtain an electrical contact covered with a n...

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Abstract

The invention discloses an electric contact, which comprises a substrate, wherein a nanometer diamond thin film heavily doped with positive trivalent elements or positive pentavalent elements is coated on the surface of the substrate. The invention also discloses a preparation method for the electric contact. The method comprises the following steps of: 1, preparing the electric contact substrate; 2, performing auxiliary nucleation treatment on the electric contact substrate; and 3, depositing the nanometer diamond thin film heavily doped with the positive trivalent elements or the positive pentavalent elements on the surface of the electric contact substrate. When the heavily-doped diamond thin film is applied to the electric contact, the electric contact has the advantages of ultrahigh thermal conductivity, ultrahigh friction and wear resistance, high electric conductivity, high breakdown voltage, high arc ablation resistance and welding resistance. Moreover, the method is simple and convenient, and the production cost is greatly reduced.

Description

technical field [0001] The invention relates to an electric contact, in particular to an electric contact with high resistance to arc ablation and a preparation method thereof. Background technique [0002] Electric contacts are contact elements of electrical equipment, electrical switches, instruments, etc.; they are mainly responsible for connecting and disconnecting circuits and load currents; their performance mainly affects the reliability of electrical equipment, electrical switches, and instruments. performance and service life. In recent years, my country's power system accidents have occurred frequently. Take the on-load tap changer as an example, the equipment failure rate reaches 15%-30%, which greatly affects the safety of power transmission and transformation, and hinders the production of the national economy. These problems are largely caused by the low quality of electrical contacts. With the rapid development of modernization, the load of high-voltage trans...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H1/02H01H11/04C23C16/27
CPCH01H1/021H01H1/06H01H2300/036C23C16/27C23C16/271H01H1/02H01H11/04C23C16/277C23C16/278
Inventor 钟建华张文英
Owner GUANGZHOU DEPOSON ELECTRIC TECH