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Device and method for preparing high-nitrogen steel powder through plasma arc melting

A plasma arc and plasma arc technology are applied in the field of devices for preparing high nitrogen steel powder by ion arc smelting, and can solve problems such as uneven distribution of nitrogen elements.

Active Publication Date: 2020-10-27
炬炼金属张家港有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the most conventional method of using plasma to prepare high-nitrogen steel is the powder preparation method, that is, the plasma is generated between the tungsten cathode and the steel anode, and the end of the steel rod is melted by the heat of the plasma, and nitrogen gas is introduced into the furnace, and the nitrogen gas in The ionization between the cathode and the steel anode forms part of the nitrogen ions, which melt into the liquid film, and then are thrown out to form nitrogen-containing steel powder, which has the problem of uneven distribution of nitrogen elements.

Method used

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  • Device and method for preparing high-nitrogen steel powder through plasma arc melting
  • Device and method for preparing high-nitrogen steel powder through plasma arc melting
  • Device and method for preparing high-nitrogen steel powder through plasma arc melting

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Experimental program
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Effect test

Embodiment 1

[0049] A method for preparing high-nitrogen steel powder by plasma arc melting, in figure 1 performed in the device shown, figure 1 Among them, 1 is the plasma furnace, 2 is the cooling water assembly, 3 is the tungsten electrode, 4 is the graphite crucible, 5 is the nitrogen conduit, 6 is the vacuum valve, 7 is the vacuum chamber, 8 is the molecular pump, 9 is the water-cooled anode, and 10 is the A heat conduction base (copper crucible), a heat conduction base 10 is placed at the bottom of the plasma furnace 1, a graphite crucible 4 is provided on the top of the heat conduction base 10, and a plasma arc assembly is provided on the vertical direction of the graphite crucible 4, so The plasma arc assembly includes a water-cooled anode 9, a tungsten electrode 3 and a nitrogen gas conduit 5, the nitrogen gas conduit 5 is located between the water-cooled anode 9 and the tungsten electrode 3, and is placed outside the tungsten electrode 3, and the tungsten electrode 3 is located o...

Embodiment 2

[0059] Same as Embodiment 1, the only difference is that the device does not contain vacuum valve vacuum chamber and molecular pump.

[0060] Specific steps are as follows:

[0061] Step 1: Assemble the plasma furnace, cooling water assembly, tungsten electrode, graphite crucible, nitrogen conduit, water-cooled anode and copper crucible;

[0062] Step 2: Place steel powder (particle size 20-200 μm) in a graphite crucible, vacuumize the plasma furnace and fill it with argon, and the distance between the tungsten electrode and the metal raw material is 5 mm;

[0063] Step 3: Start the tungsten electrode and perform plasma arc melting on the steel powder in the graphite crucible;

[0064] Step 4: When the steel powder is molten, the nitrogen conduit is turned on (the flow rate of the nitrogen gas is 10L / min, and the nitrogen gas is ionized. After the plasma arc melting, the surface of the molten steel begins to evaporate, and nitrogen-containing metal vapor is obtained. The nitr...

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Abstract

The invention provides a device and a method for preparing high-nitrogen steel powder through plasma arc melting, and belongs to the field of plasma arc melting and powdering. According to the deviceprovided by the invention, a heat-conducting base is placed on the bottom part of a plasma furnace; a graphite crucible is arranged on the top part of the heat-conducting base; a plasma arc assembly is arranged on the perpendicular direction of the graphite crucible, and comprises a water-cooling anode and a tungsten electrode; a nitrogen conduit is arranged on the outer side of the tungsten electrode; and the tungsten electrode is located vertically above the graphite crucible. According to the device and the method for preparing the high-nitrogen steel powder through plasma arc melting provided by the invention, the tungsten electrode ionizes inert gases by direct-current discharge to produce a high-temperature plasma, so that a metal raw material is molten and evaporated; and fed nitrogen is ionized to decompose nitrogen ions with higher diffusion rate, the nitrogen absorption rate constant under plasma arc action is up to 10-2m / s, and the nitrogen ions can be fully dispersed in molten steel and can be acted above the molten steel for a long time so as to have enough time to form a supersaturated nitrogenous metal solution, so that the homogeneity of nitrogen elements is furtherimproved.

Description

technical field [0001] The invention relates to the technical field of plasma arc smelting powder making, in particular to a device and method for preparing high nitrogen steel powder by plasma arc smelting. Background technique [0002] High-nitrogen steel has high strength, good corrosion resistance and good hot workability, and has always been a topic of concern, and its nitriding method is a hot research topic. Because the solubility of nitrogen in molten steel is very small, the conventional method of increasing nitrogen easily escapes during the smelting process, and cannot ensure the uniform distribution of nitrogen in molten steel. It is even more difficult to obtain high-nitrogen steel powder. [0003] Plasma arc is a high-speed flowing plasma, which has the characteristics of energy concentration. In smelting, the tungsten electrode is usually used as the cathode, and the metal to be smelted is used as the anode. The temperature at the contact point between the pl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/14
CPCB22F9/14B22F2201/02
Inventor 余建波任忠鸣李传军
Owner 炬炼金属张家港有限公司
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