Preparation method of VN19 vanadium-nitrogen alloy and sagger device

A technology of vanadium-nitrogen alloy and VN19, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of complex operation and high cost, achieve good nitriding effect, reduce preparation cost, and shorten nitriding the effect of time

Active Publication Date: 2022-01-07
承德锦科科技股份有限公司 +1
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  • Abstract
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  • Application Information

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Problems solved by technology

This method is costly and complicated

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  • Preparation method of VN19 vanadium-nitrogen alloy and sagger device

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[0026] The invention provides a kind of preparation method of VN19 vanadium nitrogen alloy, comprises the following steps:

[0027] After mixing powdery vanadium oxide, silicon dioxide powder, carbonaceous reducing agent, iron powder and binder, carry out ball pressing, drying, vacuum carbonization reduction and nitriding in sequence to obtain VN19 vanadium nitrogen alloy; the vacuum carbonization reduction The temperature is ≤1450°C, the time is ≤2.5h; the nitriding is carried out under nitrogen, the nitrogen pressure of the nitriding is ≥0.3MPa, and the time is ≤3h.

[0028] In the present invention, the VN19 vanadium-nitrogen alloy is specifically the VN19 brand vanadium-nitrogen alloy in GB / T20567-2020, and the specific composition indicators are shown in Table 1:

[0029] Table 1 Chemical Composition of VN19 Vanadium Nitrogen Alloy

[0030]

[0031] The invention mixes powdered vanadium oxide, silicon dioxide powder, carbonaceous reducing agent, iron powder and binder...

Embodiment 1

[0055] The vanadium pentoxide powder, 98% quartz powder, graphite powder and iron powder are mixed according to the mass ratio of 100:3:29:0.4, after mixing, the pellets are pressed and dried. The dry balls are put into the graphite sagger, and the bottom of the graphite sagger is provided with a number of through holes; the graphite bottom plate is placed in a vacuum furnace, and the surface of the graphite bottom plate is provided with a strip groove, and the bottom of the groove is provided with a nitrogen inlet hole, and the nitrogen gas is passed through. The hole is connected with the nitrogen inlet of the vacuum furnace; the graphite sagger is placed in the vacuum furnace and placed on the surface of the graphite bottom plate, and the bottom of the graphite sagger covers the groove on the surface of the graphite bottom plate.

[0056] Close the door of the vacuum furnace, turn on the vacuum pump, pump the vacuum in the furnace to 95Pa, start power supply for rapid heatin...

Embodiment 2

[0058] Vanadium trioxide powder, 98% quartz powder, graphite powder and starch are mixed according to the mass ratio of 100:3:26.5:3, after mixing, the pellets are pressed and dried. The dry balls are put into the graphite sagger, and the bottom of the graphite sagger is provided with a number of through holes; the graphite bottom plate is placed in a vacuum furnace, and the surface of the graphite bottom plate is provided with a strip groove, and the bottom of the groove is provided with a nitrogen inlet hole, and the nitrogen gas is passed through. The hole is connected with the nitrogen inlet of the vacuum furnace; the graphite sagger is placed in the vacuum furnace and placed on the surface of the graphite bottom plate, and the bottom of the graphite sagger covers the groove on the surface of the graphite bottom plate.

[0059] Close the door of the vacuum furnace, turn on the vacuum pump, pump the vacuum in the furnace to 88Pa, start power supply for rapid heating, the fur...

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Abstract

The invention relates to the technical field of metallurgy, and provides a preparation method of a VN19 vanadium-nitrogen alloy. According to the preparation method, powdery vanadium oxide, silicon dioxide powder, a carbonaceous reducing agent, iron powder and a binder are mixed and then sequentially subjected to ball pressing, drying, vacuum carbonization reduction and nitridation, and the VN19 vanadium-nitrogen alloy is obtained. The silicon dioxide powder is added into the raw materials, the silicon dioxide powder is reduced, and silicon nitride is generated in the nitriding process, so that the nitrogen content of a product is increased. According to the preparation method, carbonization reduction is carried out under the vacuum condition, nitridation is carried out under the high nitrogen pressure, and the VN19 vanadium-nitrogen alloy can be efficiently and rapidly prepared in an energy-saving mode. Furthermore, the trend of nitrogen gas flow in the nitriding process is optimized, and a weak cooling and strong cooling subsection cooling mode is adopted in the cooling process, so that the nitrogen content of the product is increased, heat energy is fully utilized, and the preparation cost is reduced.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a preparation method of a VN19 vanadium nitrogen alloy and a sagger device. Background technique [0002] Nitrogen is a very effective and cheap alloying element in vanadium-containing microalloy steel. For vanadium, nitrogen has a stronger affinity than carbon. Increasing the content of nitrogen in vanadium-nitrogen alloys can improve the precipitation strengthening and precipitation of vanadium in steel. The grain strengthening effect is more obvious, and at the same strength, the addition of high-nitrogen vanadium-nitrogen alloy can save the amount of vanadium added, thereby reducing the cost. Therefore, it is of great significance to increase the content of nitrogen in vanadium-nitrogen alloys. [0003] At present, the mainstream process for producing vanadium-nitrogen alloys is the pusher kiln method. The pusher kiln method produces vanadium-nitrogen alloys. During the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C27/02C23C8/24
CPCC22C1/058C22C27/025C23C8/24
Inventor 刘克忠贾怡晗王清晨刘健王朝晖曹长山刘亚亮王彬彬索小琛池浩巍李阳翁玉娟岳庆丰
Owner 承德锦科科技股份有限公司
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