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Method for preparing copper-tungsten contact material by discharge plasmas

A discharge plasma and contact material technology, which is applied in the manufacture of tools, casting molding equipment, metal processing equipment, etc., can solve the problems of high production cost and large energy consumption, achieve high production efficiency, low sintering temperature, and reduce production costs Effect

Active Publication Date: 2016-12-07
SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] From the above-mentioned process of preparing copper-tungsten contact materials, it can be seen that tungsten powder needs to be preformed. The forming process is generally completed by uniformly adding molding agents and hydraulic presses, and pre-sintering is carried out before high-temperature copper infiltration to improve copper-tungsten contacts. Comprehensive performance of materials, pre-sintering is completed by relying on vacuum sintering furnace, resulting in disadvantages such as high production cost and large energy consumption

Method used

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  • Method for preparing copper-tungsten contact material by discharge plasmas

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Effect test

Embodiment 1

[0027] The method for preparing copper-tungsten contact material by spark plasma sintering comprises the following steps:

[0028] Step 1, sintering: Pour tungsten powder with a particle size of 4 μm into a graphite mold, place the mold in a hydrogen furnace, reduce the powder, lightly burn it, and put it in a plasma sintering furnace to vacuumize and pressurize. The above-mentioned plasma treatment is argon plasma treatment, and the treatment time is 15 minutes. When the pressure reaches 30MPa, a pulsed direct current of 1200A is introduced and the temperature is raised to 1320℃ at a heating rate of 100℃ / min. After holding for 2.5min, it is cooled with the furnace Get the tungsten skeleton;

[0029] Step 2, copper block treatment: take the copper block, firstly polish it mechanically, and then perform ultrasonic cleaning on the polished copper block in an ultrasonic cleaning solution with an ultrasonic frequency of 35KHz and a temperature of 30°C. Continuous or pulsed laser ...

Embodiment 2

[0034] Step 1, sintering: Pour tungsten powder with a particle size of 6 μm into a graphite mold, place the mold in a hydrogen furnace, reduce the powder, lightly burn it, and put it in a plasma sintering furnace to vacuumize and pressurize. The above plasma treatment is argon plasma treatment, and the treatment time is 17.5min. When the pressure reaches 37.5MPa, a pulsed direct current of 1500A is introduced and the temperature is raised to 1400℃ at a heating rate of 200℃ / min. Furnace cooling to obtain a tungsten skeleton;

[0035] Step 2, copper block treatment: take the copper block, firstly polish it mechanically, then perform ultrasonic cleaning on the polished copper block in an ultrasonic cleaning solution, the ultrasonic frequency is 42.5KHz, the temperature is 34°C, and after drying, the power is 12.5 watts Continuous or pulsed laser scanning at a speed of 255 mm / s for laser irradiation, cooling to room temperature, and then plasma treatment to obtain infiltrated copp...

Embodiment 3

[0040]Step 1, sintering: Pour tungsten powder with a particle size of 8 μm into a graphite mold, place the mold in a hydrogen furnace, reduce the powder, lightly burn it, and put it in a plasma sintering furnace to evacuate and pressurize. The above plasma treatment is argon plasma treatment, the treatment time is 20min, when the pressure reaches 45MPa, a pulsed direct current of 1800A is introduced and the temperature is raised to 1480°C at a heating rate of 300°C / min, and after holding for 5min, the furnace cools to obtain Tungsten skeleton;

[0041] Step 2, copper block treatment: take copper block, first use mechanical method to polish, the copper block after polishing is ultrasonically cleaned in ultrasonic cleaning solution, ultrasonic frequency is 50KHz, temperature is 38 ℃, after drying, use a power of 20 watts Continuous or pulsed laser scans at a speed of 500 mm / s, cools to room temperature, and then performs plasma treatment to obtain infiltrated copper blocks for u...

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Abstract

The invention discloses a method for preparing a copper-tungsten contact material by discharge plasmas. The method comprises the following steps: 1, pouring tungsten powder into a graphite die, placing the graphite die into a plasma sintering furnace, performing vacuumizing and boosting, connecting the sintering furnace with pulse direct current, heating to 1,320 DEG C to 1,480 DEG C, preserving the heat for 2.5 to 5 min, and naturally cooling the graphite die in the furnace to obtain tungsten framework; 2, polishing a copper block, performing ultrasonic cleaning the copper block until the copper block is cleaned, irradiating and scanning the copper block with laser at the speed of 10 to 500 mm / s, and performing plasma treatment to obtain an infiltrating copper block for later use; 3, putting the tungsten framework into a graphite boat, placing the infiltrating copper block on the tungsten framework, filling the space around the copper block with alundum powder, putting the tungsten framework into a high-temperature sintering furnace with protective gas atmosphere, heating to 1,300 DEG C to 1,400 DEG C, and preserving the heat for 2 to 3 hours to obtain a copper-tungsten sintered body; and 4, performing vacuumizing hot pressing on the copper-tungsten sintered body under conditions that the pressure is 50 to 100 MPa and the temperature is 800 DEG C to 850 DEG C, and cooling to room temperature to obtain the copper-tungsten contact material.

Description

technical field [0001] The invention relates to the technical field of electrical contact preparation, in particular to a method for preparing copper-tungsten contact materials by spark plasma sintering. Background technique [0002] The heart element of the high-voltage switch achieves the purpose of transmitting, receiving, disconnecting and controlling energy through its breaking and connecting. Under the joint action of high voltage, high current and high temperature arc, the operation reliability, durability and stability of high-voltage electrical contacts are the key factors affecting the service life, safety and reliability of switches and the stability of power grid. [0003] Copper tungsten contacts have strong arc resistance, especially during the opening and closing process of circuit breakers, arcs will be generated, and a large amount of energy will act on the contacts. Therefore, burning-resistant materials are an important condition to ensure the electrical l...

Claims

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Application Information

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IPC IPC(8): B22D23/04B22F3/105B22C3/00C22C27/04C22C1/04B22F3/14
CPCB22C3/00B22D23/04B22F3/1007B22F3/105B22F3/14B22F2003/1051B22F2999/00C22C1/045C22C27/04B22F2201/013
Inventor 赵伟鹏郭创立周宁周兴
Owner SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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