Preparation method of nitriding vanadium alloy

A technology for nitriding vanadium alloy and nitriding reaction, applied in the field of vanadium alloy, can solve the problems of complicated operation, high reaction temperature and high production cost, and achieve the effects of simplified operation process, wide source of raw materials and high production efficiency

Inactive Publication Date: 2007-12-05
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The main disadvantages of the above several methods are: 1. Vacuum system is required, the equipment investment is high, and the operation is complicated; 2. The intermittent production of one furnace by one furnace has a long production cycle and low labor efficiency; 3. The reaction temperature is high and the reaction time is long. long, high production cost
But there are also some shortcomings: the range of raw materials used is narrow, only suitable for V 2 o 3 or V 2 o 3 with VO 2 , VO mixture, the price of raw materials is higher; the actual reaction temperature is higher (~1500°C), which increases energy consumption, reduces the service life of the sintering furnace, and the production cost is higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Mix 48g of carbon black, 152g of vanadium pentoxide and 2g of iron powder evenly, and then carry out compression molding with a pressure of 57MPa and a compact size of Φ1.5cm×1.0cm. Put the compact into the reaction furnace for heating, and pass high-purity nitrogen gas at 650°C for 0.5h, nitrogen pressure is 101325Pa, and hold at 1100°C for 1h, carbonization and nitriding reactions occur, and then cool to below 100°C out of the furnace , finally get 76.58% V-5.41% C-16.20% N-1.46% O vanadium nitride alloy, its apparent density is 3310kg / m 3 .

Embodiment 2

[0030] After mixing 48g of carbon black, 152g of vanadium pentoxide and 6g of iron sesquioxide powder evenly, carry out compression molding, the pressure is 57MPa, and the compact size is Φ1.5cm×1.0cm. Put the compact into the reaction furnace for heating, and pass high-purity nitrogen gas at 650°C for 0.5h, nitrogen pressure is 101325Pa, and hold at 1100°C for 1h, carbonization and nitriding reactions occur, and then cool to below 100°C out of the furnace , finally get 74.06% V-4.55% C-19.20% N-1.71% O vanadium nitride alloy, its apparent density is 3450kg / m 3 .

Embodiment 3

[0032] After mixing 50g of carbon black, 150g of vanadium pentoxide and 2g of iron powder evenly, carry out compression molding, the pressure is 57MPa, and the compact size is Φ1.5cm×1.0cm. Put the compact into the reaction furnace for heating, and pass high-purity nitrogen gas at 650°C for 0.5h, nitrogen pressure is 101325Pa, and hold at 1100°C for 1h, carbonization and nitriding reactions occur, and then cool to below 100°C out of the furnace , finally get 76.98% V-6.48% C-15.10% N-1.41% O vanadium nitride alloy, its apparent density is 3300kg / m 3 .

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Abstract

The present invention provides process of preparing vanadium nitride alloy. The process includes mixing vanadium oxide, carbon powder and density reinforcer, pressing to form, setting the shaped mixture into a reaction furnace, heating to 650 deg.c while introducing nitrogen or ammonia as the reacting and protecting gas into the furnace, further heating to 1000-1250 deg.c to produce carbonizing and nitriding reaction for 3 hr, cooling to 100 deg.c, and discharging the vanadium nitride alloy. The vanadium nitride alloy contains V 73-80 %, N 12-20 %, C 3-8 % and O 0.5-2.0 %, and has apparent density of 3000-4000 kg/cu m. The process has the features of low reaction temperature, short reaction period, low cost, etc, and the prepared vanadium nitride alloy with high nitrogen content is suitable for use in steel making.

Description

technical field [0001] The invention belongs to the technical field of vanadium alloys, in particular to a preparation method of vanadium nitride alloys. Background technique [0002] Vanadium nitride is an important vanadium alloy additive. Existing studies have shown that adding vanadium nitride to steel can improve the steel's comprehensive mechanical properties such as wear resistance, corrosion resistance, toughness, ductility, hardness, and thermal fatigue resistance, and make the steel have good weldability. And play the role of eliminating the extension of inclusions. The increase of nitrogen content in vanadium steel reduces the tendency of precipitates to grow and coarsen, and the particles of precipitates become finer, so that the effect of vanadium can be fully exerted. Compared with the use of vanadium iron, the vanadium nitride alloy additive can save 20% to 40% of vanadium in high-strength low-alloy steel, thereby reducing production costs. [0003] Domesti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C29/16
Inventor 刘颖赵志伟曹泓叶金文高升吉涂铭旌
Owner SICHUAN UNIV
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