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Low-oxygen-content titanium or titanium alloy spherical powder and preparing method and application thereof

A spherical powder, titanium alloy technology, applied in metal processing equipment, transportation and packaging, additive processing, etc., can solve the problems of excessive oxygen impurity content, affecting the application of spheroidized powder, and increasing oxygen content, and achieves a beneficial effect. The effect of liquidity

Active Publication Date: 2018-10-23
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when this method is used to prepare titanium alloy spherical powder, due to the plasma high temperature environment during the spheroidization process, finer particles are deposited on the surface of titanium or titanium alloy particles, and it is easy to combine with trace oxygen in the environment to cause oxygen content. Larger, affecting the subsequent application of spheroidized powder
Excessive oxygen impurity content will seriously affect the mechanical properties of titanium or titanium alloy products

Method used

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  • Low-oxygen-content titanium or titanium alloy spherical powder and preparing method and application thereof
  • Low-oxygen-content titanium or titanium alloy spherical powder and preparing method and application thereof
  • Low-oxygen-content titanium or titanium alloy spherical powder and preparing method and application thereof

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Embodiment 1

[0030] With -200 mesh irregular titanium alloy (TC4) powder as raw material, titanium alloy (TC4) spherical powder with a spheroidization rate of 95% is obtained through 60kW plasma spheroidization, and the powder yield is about 85% (within a certain period of time, the ball is collected powder weight divided by the original powder weight used), the microscopic appearance of the particles is as follows figure 2 shown. The oxygen content was tested by OHN elemental analyzer to be 3123ppm. Prepare a mixed solution of hydrofluoric acid and nitric acid with a molar ratio of 0.1:1, through such as figure 1 The pickling process is shown, wherein the pickling reaction time is 30 seconds, and the water is washed 4 times, and the obtained powder particle morphology is as follows: image 3 . The oxygen content was tested by OHN elemental analyzer to be 2258ppm.

Embodiment 2

[0032] Using -200 mesh irregular titanium alloy (TC4) powder as raw material, titanium alloy (TC4) spherical powder with a spheroidization rate of 95% is obtained by 60kW plasma spheroidization, and the powder yield is about 85%. The microscopic appearance of the particles is as follows figure 2 shown. The oxygen content was tested by OHN elemental analyzer to be 3123ppm. Prepare a mixed solution of hydrofluoric acid and nitric acid with a molar ratio of 0.1:1, through such as figure 1 The pickling process is shown, wherein the pickling reaction time is 60 seconds, and the water is washed 4 times. The oxygen content was tested by OHN elemental analyzer to be 1734ppm.

Embodiment 3

[0034] Using -200 mesh irregular titanium alloy (TC4) powder as raw material, titanium alloy (TC4) spherical powder with a spheroidization rate of 95% is obtained by 60kW plasma spheroidization, and the powder yield is about 85%. The microscopic appearance of the particles is as follows figure 2 shown. The oxygen content was tested by OHN elemental analyzer to be 3123ppm. Prepare a mixed solution of hydrofluoric acid and nitric acid with a molar ratio of 0.5:1, through such as figure 1 The pickling process is shown, wherein the pickling reaction time is 30 seconds, and the water is washed 4 times. The oxygen content was tested by OHN elemental analyzer to be 2349ppm.

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Abstract

The invention relates to low-oxygen-content titanium or titanium alloy spherical powder and a preparing method and application thereof, and belongs to the field of powder preparing. Titanium or titanium alloy powder is subjected to balling through radio frequency plasma, more fine particles are deposited on the surfaces of titanium or titanium alloy particles in the balling process due to the plasmas high-temperature acting environment, the particles are prone to being combined with a trace of oxygen in the environment, consequently, the oxygen content of the titanium or titanium alloy spherical powder becomes large, and subsequent application of the balled powder is influenced. To solve the problem, a certain amount of titanium or titanium alloy spherical powder is placed in a mixed solution of hydrofluoric acid and nitric acid with the molar ratio being (0.1-10):1 or a boiled oxalic acid water solution with the mass percent being 1%-20%, 10-400 W of ultrasonic vibration is conductedfor assistance, after the reaction is conducted for a certain time, powder is centrifugally filtered out, cleaning is conducted through pure water, and finally, drying is conducted. The oxygen contentof the obtained powder is greatly reduced, the particle surfaces are smoother, the flowing property is improved, and meanwhile original components and the original component content of the sphericalpowder are kept unchangeable. According to the above beneficial effects, the titanium or titanium alloy spherical powder can be better applied to the fields of powder injection forming, 3D printing and the like.

Description

technical field [0001] The invention relates to titanium or titanium alloy spherical powder with low oxygen content, a preparation method and application thereof, and belongs to the field of powder preparation. Background technique [0002] Titanium alloy has the advantages of high strength, low density, good mechanical properties, good toughness and corrosion resistance. Due to the needs of the development of the aviation industry, the titanium industry develops at an average annual growth rate of about 8%. At present, the annual output of titanium alloy processing materials in the world has reached more than 40,000 tons, and there are nearly 30 kinds of titanium alloy grades. The most widely used titanium materials at this stage are titanium alloys such as Ti-6Al-4V (abbreviated as TC4), Ti-5Al-2.5Sn (abbreviated as TA7) and industrial pure titanium (abbreviated as TA1, TA2 and TA3). [0003] Using plasma as a heat source has great technical advantages in the spheroidiza...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00
CPCB33Y70/00B22F1/065B22F1/14B22F1/145
Inventor 石明刘燕辉张政林文雄黄见洪
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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