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A method for preparing spherical niobium alloy powder

A niobium alloy and powder technology, applied in the field of preparing spherical niobium alloy powder, can solve the problems of limiting the rotation speed of the bar material, the size distribution is not concentrated, the powder shape is irregular, etc., and achieves low disturbance, high production efficiency, and high sphericity. Effect

Active Publication Date: 2020-04-21
XIAN SAILONG AM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing centrifugal atomization method adopts horizontal rod rotation to make powder, and the rod rotates along the horizontal direction in the atomization chamber, but due to its own gravity, the long rod will sag at one end of the horizontal direction, resulting in rod There will be a certain disturbance when the material rotates, which will easily cause irregular powder shape and non-concentrated size distribution; in addition, the bar material needs to be fed while rotating at a high speed, which greatly limits the rotation speed of the bar material, and finally makes the powder Particle size is too large

Method used

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  • A method for preparing spherical niobium alloy powder
  • A method for preparing spherical niobium alloy powder
  • A method for preparing spherical niobium alloy powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Step 1. Mix vanadium particles, chromium particles, aluminum-tungsten master alloy, and hafnium particles evenly to form a mixture, wrap the mixture with aluminum foil to prepare an alloy bag, and then press the alloy bag together with 0-grade sponge titanium to form an alloy rod. In the inert gas protection glove box, the alloy rod and the niobium rod are welded into electrodes; the mass ratio of aluminum and tungsten in the aluminum-tungsten master alloy is 1:1;

[0029] The electrode is composed of the following elements by mass percentage: 5% vanadium, 2.5% chromium, 2.5% aluminum, 2.5% tungsten, 2.6% hafnium, 12% titanium, and the balance is niobium;

[0030] Step 2, sending the electrode obtained in step 1 into a vacuum consumable electric arc furnace for smelting twice to obtain a niobium alloy ingot;

[0031] Step 3, processing the niobium alloy ingot obtained in step 2 into a niobium alloy rod with a diameter of 100 mm and a length of 500 mm; the straightness o...

Embodiment 2

[0035] Step 1. Mix vanadium particles, chromium particles, aluminum-tungsten master alloy, and hafnium particles evenly to form a mixture, wrap the mixture with aluminum foil to prepare an alloy bag, and then press the alloy bag together with 0-grade sponge titanium to form an alloy rod. In the inert gas protection glove box, the alloy rod and the niobium rod are welded into electrodes; the mass ratio of aluminum and tungsten in the aluminum-tungsten master alloy is 1:1;

[0036] The electrode is composed of the following elements by mass percentage: 5.5% vanadium, 3% chromium, 2% aluminum, 2% tungsten, 3% hafnium, 16% titanium, and the balance is niobium;

[0037] Step 2, sending the electrode obtained in step 1 into a vacuum consumable electric arc furnace for smelting 3 times to obtain a niobium alloy ingot;

[0038] Step 3, processing the niobium alloy ingot obtained in step 2 into a niobium alloy rod with a diameter of 120 mm and a length of 300 mm; the straightness of th...

Embodiment 3

[0042] Step 1. Mix vanadium particles, chromium particles, aluminum-tungsten master alloy, and hafnium particles evenly to form a mixture, wrap the mixture with aluminum foil to prepare an alloy bag, and then press the alloy bag together with 0-grade sponge titanium to form an alloy rod. In the inert gas protection glove box, the alloy rod and the niobium rod are welded into electrodes; the mass ratio of aluminum and tungsten in the aluminum-tungsten master alloy is 1:1;

[0043] The electrode is composed of the following elements by mass percentage: 6% vanadium, 2% chromium, 3% aluminum, 3% tungsten, 2% hafnium, 14% titanium, and the balance is niobium;

[0044] Step 2, sending the electrode obtained in step 1 into a vacuum consumable electric arc furnace for smelting 3 times to obtain a niobium alloy ingot;

[0045] Step 3, processing the niobium alloy ingot obtained in step 2 into a niobium alloy rod with a diameter of 110 mm and a length of 400 mm; the straightness of the ...

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Abstract

The invention discloses a method for preparing spherical niobium alloy powder. The method is as follows: 1. After mixing vanadium grains, chromium grains, aluminum-tungsten master alloy and hafnium grains, wrap them in aluminum foil to make an alloy bag, and then press it with sponge titanium to form Alloy rods, alloy rods and niobium bars are welded into electrodes; 2. Send the electrodes into a vacuum consumable electric arc furnace to melt into niobium alloy ingots; 3. Process niobium alloy ingots into ingots with a diameter of 100mm-120mm and a length of 300mm-500mm Niobium alloy rod; 4. The vertically rotating niobium alloy rod is melted into droplets under the action of the plasma gun, and the droplets are centrifugally dispersed and condensed to obtain spherical niobium alloy powder. The niobium alloy bar material of the invention rotates along the vertical direction in the atomization chamber, which greatly reduces the disturbance effect during horizontal rotation, and improves the sphericity and size uniformity of the niobium alloy powder. Moreover, the preparation method has the advantages of simple process, high production efficiency and low pollution risk, and is suitable for large-scale production of spherical niobium alloy powder.

Description

technical field [0001] The invention belongs to the technical field of alloy powder preparation, and in particular relates to a method for preparing spherical niobium alloy powder. Background technique [0002] Niobium alloys have high strength and good processing properties at high temperatures, and can be used as protective materials and structural materials for hypersonic aircraft, aerospace vehicles, satellites, and supersonic low-altitude rockets in the aerospace field. However, the composition of niobium alloy is complex and there are many refractory components. When producing niobium alloy parts with complex shapes and structures, there are problems such as serious alloy composition segregation, uneven structure, and difficult processing and forming. In order to solve the above shortcomings, powder metallurgy net shape process or additive manufacturing process is mostly used to prepare high-performance niobium alloy parts, and the above two processes require high-qual...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/14C22C27/02C22C1/03
CPCB22F9/14C22C1/03C22C27/02
Inventor 贺卫卫陈斌科向长淑王新锋苏腾飞王富铎王超汤慧萍
Owner XIAN SAILONG AM TECH CO LTD