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Preparation Technology of Vanadium Nitrogen Alloy

A vanadium-nitrogen alloy and preparation technology, which is applied in the field of metallurgy, can solve the problems of inconsistent reaction process of forming pellets, insufficient product shrinkage, and unstable product quality, so as to avoid insufficient product shrinkage, stable product quality, and save production cost effect

Inactive Publication Date: 2020-06-30
湖北晶洋科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In current industrial production, the commonly used method for preparing vanadium-nitrogen alloys is the carbothermal reduction-nitridation method, that is, after pressing and molding raw materials such as vanadium pentoxide, they are placed under a nitrogen flow, and in a high-temperature environment, they are rapidly sintered (that is, directly heated at a high temperature) ), to make a vanadium-nitrogen alloy. During this period, the oxygen in the vanadium pentoxide is replaced by nitrogen. Since this replacement process is not completed in one step, the process control in the sintering process will directly affect whether the vanadium pentoxide replacement reaction is fully carried out. Moreover, the rapid sintering will also cause the reaction process of the inside and the surface of the molded pellets to be inconsistent, which will lead to the extremely unstable quality of the prepared product, often resulting in insufficient shrinkage of the product or bursting on the surface of the product.

Method used

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  • Preparation Technology of Vanadium Nitrogen Alloy
  • Preparation Technology of Vanadium Nitrogen Alloy
  • Preparation Technology of Vanadium Nitrogen Alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Get and be ground to grinding powder particle size and be the powdery vanadium oxy compound (vanadium pentoxide, containing vanadium 61%) 1000kg, carbonaceous reducing agent (graphite powder) 280kg, binding agent (water) 5kg, promotor ( Iron powder) 40kg is mixed evenly, then applies pressure molding to be the ellipsoid molding of 50mm * 50mm * 30mm.

[0058] Put the molding into crucibles, and send these crucibles into a sintering furnace for heating. The sintering furnace is divided into four temperature zones with different temperatures, wherein the temperature of the first temperature zone is set at 650°C, The temperature is set to 800°C, the temperature in the third temperature zone is set to 1100°C, and the temperature in the fourth temperature zone is set to 1500°C. Feed nitrogen into the crucible, so that the molded product in the crucible is in a nitrogen atmosphere (nitrogen volume percentage concentration is not less than 99.99%, nitrogen pressure is 0.2MP, n...

Embodiment 2

[0060] Get and be ground to grinding powder particle size and be-150 object powdery vanadium oxycompound (vanadium trioxide, vanadium content 55.4%) 1000kg, carbonaceous reducing agent (graphite powder) 250kg, binding agent (starch) 4kg, accelerator ( Ferrous carbonate powder) 30kg is mixed homogeneously, then applies pressure molding to be the ellipsoid molding of 50mm * 50mm * 30mm.

[0061] Put the molding into crucibles, and send these crucibles into a sintering furnace for heating. The sintering furnace is divided into four temperature zones with different temperatures, wherein the temperature of the first temperature zone is set at 630°C, The temperature is set to 850°C, the temperature in the third temperature zone is set to 1200°C, and the temperature in the fourth temperature zone is set to 1495°C. Feed nitrogen into the crucible, so that the molded product in the crucible is in a nitrogen atmosphere (nitrogen volume percentage concentration is not less than 99.99%, n...

Embodiment 3

[0063] Get and grind until the grinding particle size is -120 purpose powdery vanadium oxy compound (vanadium dioxide, vanadium content 67%) 1000kg, carbonaceous reductant (coke powder) 300kg, binding agent (polyvinyl alcohol) 8kg, accelerator (Ferric oxide powder) 50kg is mixed evenly, then applies pressure molding to be the ellipsoid molding of 50mm * 50mm * 30mm.

[0064] Put the molding into crucibles, and send these crucibles into a sintering furnace for heating. The sintering furnace is divided into four temperature zones with different temperatures, wherein the temperature of the first temperature zone is set at 580°C, The temperature is set to 750°C, the temperature in the third temperature zone is set to 1150°C, and the temperature in the fourth temperature zone is set to 1490°C. Feed nitrogen into the crucible, so that the molded product in the crucible is in a nitrogen atmosphere (nitrogen volume percentage concentration is not less than 99.99%, nitrogen pressure is...

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Abstract

The invention discloses a preparation technology of a vanadium-nitrogen alloy, and relates to the technical field of metallurgy. The technology comprises the following steps: uniformly mixing an oxovanadium compound, a carbon reducing agent, an accelerant and an adhering agent; pressing and molding to obtain a molded material; and sintering the molded material by sections to obtain the vanadium-nitrogen alloy, wherein the step of sintering by sections comprises four heating stages which are sequentially continuously carried out; the temperature is 0-650 DEG C, and the heating costs 100-120minin the first stage; the temperature is 700-900 DEG C, and the heating costs 250-280min in the second stage; the temperature is not less than 1100 DEG C, and the heating costs 200-220min in the third stage; and the temperature is 1100-1500 DEG C, and the heating costs 1000-1200min in the fourth stage. According to the technology, the reaction condition of materials in the preparation of the vanadium-nitrogen alloy is analyzed, and the sintering is carried out by sections, and moreover, the temperature and the time in each stage are strictly controlled, so that the quality of the vanadium-nitrogen alloy product is improved, and the prepared product is table in quality.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a preparation process of a vanadium-nitrogen alloy. Background technique [0002] Vanadium-nitrogen alloy is a steel additive: vanadium carbide or vanadium nitride precipitation can pin dislocations and grain boundaries, hinder the migration of dislocations and grain boundaries, thereby improving the strength of steel; at the same time, increasing nitrogen in steel can strengthen carbonitriding The precipitation of vanadium can change the interphase distribution of vanadium and give full play to the precipitation strengthening effect of vanadium. Moreover, nitrogen infiltration into steel can also refine the grains. Therefore, when producing steel materials, adding vanadium-nitrogen alloys to steel can effectively Strengthen and refine the grains, save vanadium-containing raw materials, improve the strength and toughness of steel, and make the steel have good weldability, ther...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C35/00C22C29/16C22C1/05
CPCC22C1/058C22C29/16C22C35/00
Inventor 甘锦旺
Owner 湖北晶洋科技有限公司