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A vanadium nitride multi-field coupling preparation process and device

A preparation device and preparation process technology, applied in the field of vanadium nitride multi-field coupling preparation process and equipment, can solve the problems of high carbonitridation temperature, low product strength, high device temperature, etc., to prolong the life of refractory materials and high mechanical strength , high conversion efficiency

Active Publication Date: 2021-09-21
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this process, high carbonitriding temperature, long production time, short service life of refractory materials, high power consumption, large consumption of silicon-molybdenum rod heating element materials, and low mechanical strength of products are all outstanding problems in the existing technology.
[0005] In order to overcome the above technical problems, scientific and technological workers once wanted to electrify the graphite sagger or install electrodes on the rotary kiln for electrification production, but because the temperature of the device is still not lower than 1300 ° C, problems such as high device temperature and low product strength have been solved. not resolved

Method used

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  • A vanadium nitride multi-field coupling preparation process and device
  • A vanadium nitride multi-field coupling preparation process and device
  • A vanadium nitride multi-field coupling preparation process and device

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Experimental program
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Embodiment 1

[0039] This embodiment raw material ratio is: V 2 o 5 73wt%, 25wt% graphite, 2wt% iron powder, mixed under 20Mpa pressure to form a cube-shaped intermediate green body;

[0040] Afterwards, 100±5°C, the middle body is energized, and its cross-sectional current is 0.15A / mm 2 Restoration for 2 hours;

[0041] Then, at a temperature of 1990±10°C, nitrogen at 1 atmosphere, and a pressure of 10Mpa, 2A / mm 2 Carbo-nitridation was carried out for 0.5 hour by cross-sectional current three-field coupling, and the obtained product had an apparent density of 2.87g / cm3, a nitrogen content of 19.91wt%, a vanadium content of 79.94wt%, and a carbon content of 0.15wt%. The product looks like figure 2 As shown, its composition is as figure 1 shown.

Embodiment 2

[0043] The difference between this embodiment and embodiment 1 is that V 2 o 3 , and the reduction step is not performed after molding; the three-field coupled carbonitriding process is directly performed.

Embodiment 3

[0045] This embodiment is different from embodiment 1 in that:

[0046] After the raw material is formed, the intermediate body is energized at 145±5°C, and the cross-sectional current is 0.05A / mm 2 Restoration for 2 hours;

[0047] Next, at a temperature of 1000±10°C, nitrogen at 1.5 atmospheres, and the intermediate blank with a pressure of 1Mpa and a cross-sectional current of 1A / mm2, the three-field coupling action is carried out for carbonitriding for 4 hours to obtain the product. The apparent density of the obtained product is 3.01g / cm3, and the nitrogen content 15.57wt%, vanadium content 84.13wt%, carbon content 0.3wt%.

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Abstract

A vanadium nitride multi-field coupling preparation process and device. The disclosed process includes mixing a carbon source in a formulated amount, vanadium trioxide and iron powder, and applying a first pressure to form an intermediate green body; In a nitrogen environment, apply a second pressure to the intermediate body while passing a second current, and carry out carbonitridation through the coupling action of force field, temperature field and electric field to obtain vanadium nitride. The disclosed device includes a heating kiln, an insulating refractory reactor and a pressure device. Two conductive rails are arranged at the bottom of the heating kiln, and external power connectors are arranged on the two conductive rails; two opposite The space between the two electrodes is the space for placing the intermediate green body, and the bottoms of the two electrodes are respectively movable on the two conductive guide rails; the pressure device is used to apply pressure to the intermediate green body in the insulated refractory reactor. pressure. The invention can prepare vanadium nitride products with high strength, high density and low carbon content, while saving energy and reducing consumption, and being green and environment-friendly.

Description

technical field [0001] The invention relates to vanadium nitride production technology, in particular to a vanadium nitride multi-field coupling preparation process and equipment. Background technique [0002] Vanadium nitride, also known as vanadium nitrogen alloy, is a new alloy additive that can replace ferrovanadium for the production of microalloyed steel. The addition of vanadium nitride to steel can improve the comprehensive mechanical properties of steel such as strength, toughness, ductility and thermal fatigue resistance, and make the steel have good weldability. When the same strength is achieved, the addition of vanadium nitride saves 30-40% of the added vanadium, thereby reducing the production cost of steel. [0003] In microalloyed steel, vanadium mainly plays a role of precipitation strengthening, improving steel strength, heat resistance and short-term creep resistance, and improving steel toughness and plasticity; and the addition of nitrogen can promote v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C29/16C21C7/00
CPCC21C7/0006C22C1/055C22C29/16
Inventor 赵鹏朱建明武航进李江江景明海刘先松刘新远朱军
Owner CHANGAN UNIV