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Preparation method for low-cost 3D printing Nb521 alloy powder

A 3D printing and alloy powder technology, applied in the field of powder metallurgy, can solve problems such as difficult and low-cost preparation, environmental pollution, waste of resources, etc., and achieve the effects of controllable impurities, high powder yield, and reduced raw material costs

Pending Publication Date: 2020-05-19
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a low-cost method for preparing Nb521 alloy powder with low impurities and good fluidity, which can meet the requirements of the 3D printing process. First, it solves the current problems of waste of resources and pollution of Nb521 alloy chips and waste. Second, Solve the problem of low-cost preparation of Nb521 alloy powder raw materials for 3D printing

Method used

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  • Preparation method for low-cost 3D printing Nb521 alloy powder
  • Preparation method for low-cost 3D printing Nb521 alloy powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Cut the Nb521 alloy machining cutting waste into chips with a length of 10-20 mm, put them into acetone and perform ultrasonic cleaning for 10 minutes. Weigh 6 kg of Nb521 alloy scraps into a hydrogenation furnace, feed high-purity hydrogen, and raise the temperature to 700°C at a rate of 20°C / min in a hydrogen atmosphere, and complete the hydrogenation reaction after holding for 5 hours to obtain hydrogenated Nb521 alloy scraps; The hydrogenated Nb521 alloy scraps were taken out, crushed and graded in an argon atmosphere to obtain powders, and then the powders were placed in 2×10 - 3 In a Pa vacuum furnace, the temperature was raised to 750°C at a rate of 10°C / min for dehydrogenation. After dehydrogenation reaction for 2 hours, the temperature was lowered to room temperature, and the powder was taken out under an argon atmosphere; Weigh 0.5kg of Nb521 alloy powder with regular shape and put it into the fluidization equipment, pass argon gas from bottom to top, the flo...

Embodiment 2

[0020] Cut the Nb521 alloy machining cutting waste into chips with a length of 8-15 mm, put them into acetone and perform ultrasonic cleaning for 8 minutes. Weigh 8 kg of Nb521 alloy scraps into a hydrogenation furnace, feed high-purity hydrogen, and raise the temperature to 650°C at a rate of 15°C / min in a hydrogen atmosphere, and complete the hydrogenation reaction after holding for 4 hours to obtain hydrogenated Nb521 alloy scraps; The hydrogenated Nb521 alloy scraps were taken out, crushed and graded in an argon atmosphere to obtain powders, and then the powders were placed in a 1×10 -3 In a Pa vacuum furnace, the temperature was raised to 750°C at a rate of 15°C / min for dehydrogenation. After the dehydrogenation reaction was performed for 3 hours, the temperature was lowered to room temperature, and the powder was taken out under an argon atmosphere; Weigh 1 kg of Nb521 alloy powder with regular shape and put it into the fluidization equipment, pass argon gas from bottom ...

Embodiment 3

[0022] Cut the machining waste of Nb521 alloy into chips with a length of 5-10 mm, put them into acetone and perform ultrasonic cleaning for 6 minutes. Weigh 15kg of Nb521 alloy scraps into the hydrogenation furnace, feed high-purity hydrogen, raise the temperature to 700°C at a rate of 10°C / min in a hydrogen atmosphere, and complete the hydrogenation reaction after holding for 5 hours to obtain hydrogenated Nb521 alloy scraps; The hydrogenated Nb521 alloy scraps were taken out, crushed and graded in an argon atmosphere to obtain powders, and then the powders were placed in a 1×10 -3 In a Pa vacuum furnace, the temperature was raised to 720°C at a rate of 15°C / min for dehydrogenation. After dehydrogenation reaction for 4 hours, the temperature was lowered to room temperature, and the powder was taken out under an argon atmosphere; Weigh 0.3kg of regular shape Nb521 alloy powder and put it into the fluidization equipment, flow argon gas from bottom to top, the flow rate is 0.8L...

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Abstract

The invention discloses a preparation method for low-cost 3D printing Nb521 alloy powder, and belongs to the technical field of powder metallurgy powder preparation. The method comprises the followingsteps: taking Nb521 alloy cutting waste as a raw material, and performing processes such as hydrogenation, crushing, dehydrogenation and fluidifying modification to obtain a final product. By recycling the Nb521 alloy waste, the preparation method is low in cost, and further can effectively solve the problems such as resource waste and environmental pollution; the waste is prepared into the Nb521alloy powder through a hydrogenation dehydrogenation process, and the powder is rectified and modified through fluidization treatment, so that fluidity is improved, and the Nb521 alloy powder with oxygen content lower than or equal to 0.01wt%, carbon content lower than or equal to 0.06wt%, a medium diameter (D50) smaller than or equal to 40 microns, and fluidity lower than or equal to 35s / 50g canbe prepared, and therefore, requirements of a 3D printing process can be met.

Description

technical field [0001] The invention belongs to the field of powder metallurgy, and relates to a method for preparing low-cost 3D printing Nb521 alloy powder by using cutting waste. Background technique [0002] Because niobium and niobium alloys (including Nb521 alloy) have the characteristics of high melting point, excellent high temperature strength and specific strength, good weldability and excellent corrosion resistance, they have broad application prospects in aviation, aerospace, energy, automobile and other fields. When niobium and niobium alloys are prepared by traditional machining processes, due to the difficulty in processing, complex processes, and low material utilization, a large amount of waste remains, resulting in a great waste of niobium resources and environmental pollution. At the same time, electron beam vacuum melting is usually used for recycling niobium and niobium alloy waste. However, due to the extremely high melting point of niobium and niobium ...

Claims

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Application Information

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IPC IPC(8): B22F9/04B22F9/02B22F1/00
CPCB22F9/04B22F9/023B22F2009/001B22F1/142
Inventor 陈刚秦明礼曲选辉路新丁旺旺陶麒鹦陈佳男陈泽鑫
Owner UNIV OF SCI & TECH BEIJING
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