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Method for preparing copper-tungsten contact material by spark plasma sintering

A technology of discharge plasma and contact materials, which is applied in the direction of manufacturing tools, casting molding equipment, metal processing equipment, etc., can solve the problems of high energy consumption and high production cost, and achieve low sintering temperature, high production efficiency, and fine and uniform product structure Effect

Active Publication Date: 2018-01-12
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

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  • Method for preparing copper-tungsten contact material by spark plasma sintering

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Effect test

Embodiment 1

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

[0028] Step 1. Sintering: Pour tungsten powder with a particle size of 4μm into a graphite mold, place the mold in a hydrogen furnace, reduce the powder, lightly burn, and release it, and place it in a plasma sintering furnace to vacuum and pressurize. The plasma treatment is argon plasma treatment. The treatment time is 15min. When the pressure reaches 30MPa, a pulsed DC current of 1200A is applied 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 and polish it mechanically. The polished copper block is ultrasonically cleaned in an ultrasonic cleaning solution with an ultrasonic frequency of 35KHz and a temperature of 30°C. After drying, use a power of 5 watts. Continuous or pulsed laser scanning...

Embodiment 2

[0034] Step 1. Sintering: pour tungsten powder with a particle size of 6μm into a graphite mold, place the mold in a hydrogen furnace, reduce the powder, lightly burn, and release the powder, and place it in a plasma sintering furnace to vacuum and pressurize. The plasma treatment is argon plasma treatment, the treatment time is 17.5 min, when the pressure reaches 37.5 MPa, a pulsed DC current of 1500 A is applied and the temperature is raised to 1400 ℃ at a heating rate of 200 ℃ / min. After holding for 3.75 min, Furnace cooling to obtain tungsten skeleton;

[0035] Step 2. Copper block processing: Take the copper block and polish it mechanically. The polished copper block is ultrasonically cleaned in an ultrasonic cleaning solution with an ultrasonic frequency of 42.5KHz and a temperature of 34°C. After drying, the power is 12.5 watts The continuous or pulsed laser is irradiated and scanned at a speed of 255 mm / s, cooled to room temperature, and then subjected to plasma treatment...

Embodiment 3

[0040] Step 1. Sintering: Pour tungsten powder with a particle size of 8μm into a graphite mold, place the mold in a hydrogen furnace, reduce the powder, lightly burn it, and then place it in a plasma sintering furnace to vacuum and pressurize. The plasma treatment is argon plasma treatment. The treatment time is 20min. When the pressure reaches 45MPa, a pulsed DC current of 1800A is applied and the temperature is raised to 1480℃ at a heating rate of 300℃ / min. After holding for 5min, it is obtained by cooling with the furnace. Tungsten skeleton

[0041] Step 2. Copper block treatment: Take the copper block and polish it mechanically. The polished copper block is ultrasonically cleaned in an ultrasonic cleaning solution with an ultrasonic frequency of 50KHz and a temperature of 38°C. After drying, use a power of 20 watts. Continuous or pulsed laser irradiation and scanning at a speed of 500 mm / s, cooling to room temperature, and plasma treatment to obtain infiltrated copper blocks...

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Abstract

The invention discloses a method for preparing copper-tungsten contact materials by spark plasma sintering, which comprises the following steps: step 1, pouring tungsten powder into a graphite mold, placing it in a plasma sintering furnace to evacuate and pressurize, and feeding pulse direct current Current and heat up to 1320-1480°C, keep warm for 2.5-5min, and cool with the furnace to obtain a tungsten skeleton; step 2, polish the copper block and clean it ultrasonically, and scan with a laser at a speed of 10-500 mm / s. Then conduct plasma treatment to obtain the infiltrated copper block for later use; Step 3, put the tungsten skeleton into the graphite boat, place the infiltrated copper block on the tungsten skeleton, use corundum powder to fill the surrounding, and place it in a protective gas atmosphere. In a high-temperature sintering furnace, after heating up to 1300-1400°C, keep it warm for 2-3 hours to obtain a sintered copper-tungsten sintered body; step 4, place the copper-tungsten sintered body at a pressure of 50-100MPa and a temperature of 800-850°C Vacuum hot pressing under the conditions, and cool to room temperature to obtain the copper tungsten contact material. The production method of the invention has the advantage of shortening the production cycle.

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 component of the high-voltage switch, through its breaking and connecting, achieves the purpose of transmitting, receiving, breaking and controlling energy. Under the combined action of high voltage, high current, and high-temperature arc, the high-voltage contactor's action reliability, durability, and stability are key factors that affect the switch life, safety and reliability, and the stability of the power grid. [0003] Copper-tungsten contacts have strong arc resistance, especially during the opening and closing process of the circuit breaker, which will generate arcs, and a large amount of energy acts on the contacts. Therefore, burn-resistant materials are an important condition for ensuring the electrical life of the circuit breaker...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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