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Method for preparing high-performance Nb521 product by low-cost printing

A high-performance, low-cost technology, applied in the field of powder metallurgy, which can solve the problems of low yield of spherical powder, high price of spherical niobium and niobium alloy powder, and high fluidity requirements.

Active Publication Date: 2020-10-30
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, 3D printing technology has high requirements on the fluidity of powder raw materials. Spherical niobium and niobium alloy powders are usually used as raw materials. The spherical powders are generally made by atomization. However, due to the high melting point of niobium and niobium alloys, atomization The yield of the spherical powder prepared by the method is extremely low, which causes the price of the spherical niobium and niobium alloy powder to be extremely high (the market price is higher than 10,000 yuan / kg), which limits the wide application of 3D printing high-performance refractory niobium and niobium alloy products. primary obstacle

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  • Method for preparing high-performance Nb521 product by low-cost printing

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. The raw material powder is hydrogenated dehydrogenated Nb521 alloy powder with a median diameter of 30 μm. The raw material Nb521 alloy powder is placed in a fluidized reaction equipment, the mass is 500g, and nitrogen or argon is filled as protective gas and fluidizing gas. After processing, a nearly spherical Nb521 alloy powder with a median diameter of 35.2μm is obtained. The fluidity is 30.8s / 50g.

[0025] 2. The nearly spherical Nb521 alloy powder obtained above has an oxygen content of 1800 ppm and a carbon content of 600 ppm.

[0026] 3. After the above treatment, the nearly spherical Nb521 alloy powder with a median diameter of 35.2 μm can be directly used for 3D printing.

[0027] 4. The nearly spherical Nb521 alloy powder 3D printed parts obtained in the present invention have a density of 98.6%, a tensile strength of 630MPa or more, and an elongation after fracture can reach 19.3%, and their mechanical properties are better than traditional fused-cast Nb521 prod...

Embodiment 2

[0029] 1. The raw material powder is hydrogenated dehydrogenated Nb521 alloy powder with a median diameter of 15 μm. The raw material Nb521 alloy powder is placed in a fluidized reaction equipment, the mass is 500g, and nitrogen or argon is filled as protective gas and fluidizing gas. After processing, a nearly spherical Nb521 alloy powder with a median diameter of 18.6 μm is obtained. The fluidity is 34.6s / 50g, oxygen content is 1900ppm, carbon content is 1150ppm, it can be directly used for 3D printing.

[0030] 2. Further, the tensile strength of the article obtained by the above 3D printing can reach 685MPa, and the elongation after fracture can reach 18.6%.

[0031] 3. The nearly spherical Nb521 alloy powder obtained above has an oxygen content of 1950 ppm and a carbon content of 600 ppm.

[0032] 4. The SEM morphology photos of Nb521 powder before and after fluidization treatment are as follows: figure 1 Shown.

Embodiment 3

[0034] 1. The raw material powder is hydrogenated dehydrogenated Nb521 alloy powder with a median diameter of 34μm. The raw material Nb521 alloy powder is placed in a fluidized reaction equipment, the mass is 300g, and nitrogen or argon is filled as protective gas and fluidizing gas. After processing, a nearly spherical Nb521 alloy powder with a median diameter of 38.3μm is obtained. The fluidity is 30.4s / 50g, oxygen content is 1560ppm, carbon content is 500ppm, it can be directly used for 3D printing.

[0035] 2. Laser selective melting and forming: The substrate material is Nb521 alloy, the substrate is preheated at 200°C, the laser power is 380W, the scanning rate is 900mm / s, and the processing layer thickness is 50μm. The formed part is subjected to sandblasting treatment, and then ultrasonically cleaned for 10 minutes and then dried to obtain a Nb521 alloy 3D printed part.

[0036] 3. After testing, the density of the part is 98.8%, the oxygen content is 1620ppm, the tensile ...

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Abstract

The invention belongs to the field of powder metallurgy, and relates to a method for preparing a high-performance Nb521 product by low-cost printing. The method comprises the following steps of firstly, putting hydrogenated dehydrogenation Nb521 alloy powder with the irregular morphology in fluidization reaction equipment for fluidization modification treatment in order to obtain nearly sphericalNb521 alloy powder which can be directly used for 3D printing forming; and then directly applying the nearly spherical Nb521 alloy powder to the 3D printing forming in order to obtain the Nb521 printing product. According to the method, the hydrogenated dehydrogenation Nb521 alloy powder raw material with the irregular morphology is loaded into the fluidization reaction equipment, a certain amountof gas (argon or hydrogen) is introduced, the equipment is heated, and the fluidization treatment is performed at the constant temperature for a certain time; the finished nearly spherical Nb521 alloy powder with better fluidity is collected after fluidization is finished, drying and screening are not needed, the nearly spherical Nb521 alloy powder can be directly used for the 3D printing, the process flow is simplified, the powder yield is high, the cost is reduced, and the continuous batch production can be realized.

Description

Technical field [0001] The invention belongs to the field of powder metallurgy, and relates to a method for preparing high-performance Nb521 products by low-cost printing, in particular to the preparation of near-spherical Nb521 alloy powder for low-cost 3D printing and high-performance 3D printing Nb521 products. [0002] technical background [0003] 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 and other fields. When traditional machining processes are used to prepare niobium and niobium alloys, due to their difficult processing, complex processes, and low material utilization rates, a large amount of waste remains, resulting in a great waste of expensive niobium resources and causing environmental pollution. The traditional casting and forg...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F3/105B33Y40/10
CPCB33Y40/10B22F1/142Y02P10/25
Inventor 陈刚曲选辉秦明礼陈佳男丁旺旺章林路新张百成陶麒鹦
Owner UNIV OF SCI & TECH BEIJING
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