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Method for preparing infiltrated copper-chromium contact material by spark plasma sintering

A discharge plasma, copper-chromium contact technology, applied in the direction of manufacturing tools, casting equipment, metal processing equipment, etc., can solve the problems of high energy consumption and high production cost, achieve uniform pore distribution, high production efficiency, and shorten production cycle. 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 process of preparing copper-chromium contact materials, it can be seen that the chromium powder needs to be pre-formed. 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 the copper-chromium contact. 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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for preparing an infiltrated copper-chromium contact material by spark plasma sintering comprises the following steps:

[0025] Step 1, sintering: Pour the chromium powder into the graphite mold, place the mold in a hydrogen furnace, reduce the powder, lightly burn it, and put it in the plasma sintering furnace to evacuate and pressurize it. When the pressure reaches 25MPa, Pass in a pulsed direct current of 1200A and raise the temperature to 1050°C at a heating rate of 120°C / min. After holding for 2.5 minutes, cool with the furnace to obtain a chromium skeleton with pores;

[0026] 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 scanning at a speed of 10 mm / s, cooling to room temperature, and then performing plasma treatment, the pl...

Embodiment 2

[0032] A method for preparing an infiltrated copper-chromium contact material by spark plasma sintering comprises the following steps:

[0033] Step 1, sintering: Pour the chromium powder into the graphite mold, place the mold in a hydrogen furnace, reduce the powder, lightly burn it, and put it in the plasma sintering furnace to evacuate and pressurize it. When the pressure reaches 35MPa, A pulsed direct current of 1500A was introduced and the temperature was raised to 1215°C at a heating rate of 160°C / min. After holding for 3.75min, the chromium skeleton with pores was obtained by cooling with the furnace;

[0034] 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, cooling to room t...

Embodiment 3

[0040] A method for preparing an infiltrated copper-chromium contact material by spark plasma sintering comprises the following steps:

[0041] Step 1, sintering: Pour the chromium powder into the graphite mold, place the mold in a hydrogen furnace, reduce the powder, lightly burn it, and put it in the plasma sintering furnace to evacuate and pressurize. When the pressure reaches 45MPa, Pass in a pulsed direct current of 1800A and raise the temperature to 1380°C at a heating rate of 200°C / min. After holding for 5 minutes, cool with the furnace to obtain a chromium skeleton with pores;

[0042] 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 scanning at a speed of 500 mm / s, cooling to room temperature, and then performing plasma tr...

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Abstract

The invention discloses a method for preparing an infiltrated copper-chromium contact material by spark plasma sintering. Step 1: Pour chromium powder into a graphite mold, restore the powder, and then place it in a plasma sintering furnace to evacuate and pressurize. Pass in a pulsed direct current and heat up to 1050-1380°C, keep warm for 2.5-5min, and then cool with the furnace; step 2, take the copper block and polish it, clean it with ultrasonic waves, dry it, scan it with laser light, and then conduct plasma treatment. Obtain the infiltrated copper block; step 3, put the chromium skeleton into the graphite boat, place the infiltrated copper block on the chromium skeleton, fill it with corundum powder around it, place it in a high-temperature sintering furnace with a protective gas atmosphere, and heat up to After 1150-1300°C, heat preservation for 40-60min to obtain a copper-chromium sintered body; step 4, vacuumize and hot-press the copper-chromium sintered body at a pressure of 50-100MPa and a temperature of 800-850°C, and then cool to At room temperature, the copper-chromium contact material is prepared. 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 an infiltrated copper-chromium contact material 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 chromium 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 th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D23/04B22F3/11C22C9/00C22C1/04B22C3/00
CPCB22C3/00B22D23/04B22F3/1007B22F3/11B22F2999/00C22C1/0425C22C9/00B22F2201/013B22F2003/1051
Inventor 王文斌艾璇王小军师晓云李刚徐润升
Owner SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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