A kind of preparation method of spherical tungsten powder with narrow particle size distribution
A narrow particle size distribution and particle size distribution technology, applied in the field of powder metallurgy, can solve the problems of wide powder particle size distribution, low yield, and particle growth, and achieve the effects of narrow particle size distribution, high yield, and high powder purity
Active Publication Date: 2019-10-18
UNIV OF SCI & TECH BEIJING
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Problems solved by technology
[0006] The purpose of the present invention is to solve the problems that the spheroidization process is difficult to control due to the agglomeration of raw material tungsten powder, the particles grow up after spheroidization, the powder particle size distribution is wide, and the yield is low. Combination of powder processing technology to prepare spherical tungsten powder with high spheroidization rate and narrow particle size distribution
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[0028] Step 1. Drying treatment: place the powder with a Fischer particle size of 8 μm in a drying furnace and heat it to 100° C. for 1 hour under an inert gas atmosphere;
[0029] Step 2. Inflate gas protection and clean the equipment: fill the equipment with high-purity nitrogen to remove air and inflate and clean the equipment;
[0030] Step 3. Airflow impact crushing powder: adjust the appropriate pressure to start the grinding valve to crush the powder, the grinding pressure is 0.70MPa;
[0031] Step 4. Collect fine powder: adjust the rotation speed of the sorting wheel to 7200r / min to collect tiny particles in tungsten powder;
[0032] Step 5. Adjust the sorting wheel to classify the powder: adjust the speed to start the sorting wheel to classify the powder, and the speed of the sorting wheel is 6000r / min;
[0033] Step 6. Material separation and collection: collect the crushed and classified powder;
[0034] Step 7. Powder feeding and spheroidization: the powder is se...
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Abstract
A method for preparing spherical tungsten powder with narrow particle size distribution, the invention belongs to the field of powder metallurgy preparation, and provides a method for preparing spherical tungsten powder with narrow particle size distribution. Spherical tungsten powder with narrow particle size distribution was prepared by dispersing, grading and plasma spheroidizing commercially purchased severely agglomerated tungsten powder (3‑20 μm). The specific process is: the raw tungsten powder with high agglomeration, irregular shape and wide particle size distribution is completely dispersed and effectively classified by jet mill, and then the processed tungsten powder is spheroidized by radio frequency plasma torch to obtain a spherical shape. Tungsten powder. The advantages of the present invention are: the jet mill dispersion, grading treatment and radio frequency plasma spheroidization are combined to solve the problem that the spherical tungsten powder obtained by single radio frequency plasma spheroidization is agglomerated and grows up due to agglomeration, the fine powder gasifies and disappears, and the particle size distribution is wide. And the problem that the process is difficult to control, the obtained powder has good sphericity, narrow particle size distribution, high spheroidization rate, smooth surface and high yield.
Description
technical field [0001] The invention belongs to the field of powder metallurgy and relates to a preparation method of spherical tungsten powder with narrow particle size distribution. [0002] technical background [0003] Due to its good sphericity, fluidity and high tap density, spherical tungsten powder is mainly used in fields such as thermal spraying, filter materials, cathodes and porous materials. At present, the demand for high-quality spherical tungsten powder is increasing day by day. In the field of thermal spraying, the coating obtained by spherical powder is more uniform and dense due to its good fluidity and high tap density. In the field of powder metallurgy, the shrinkage of compacts prepared from spherical powders during sintering is more controllable, the microstructure is more uniform, and the precise control of internal pores and pore sizes can be achieved. In the field of cathode preparation, in order to ensure the emission performance of the cathode, Am...
Claims
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IPC IPC(8): B22F9/04B22F1/00
CPCB22F9/04B22F2009/044B22F1/065
Inventor 秦明礼李睿陈铮章林章雨峰陈鹏起黄化鲁慧峰贾宝瑞曲选辉
Owner UNIV OF SCI & TECH BEIJING