喷嘴入口倾斜角对干法造粒制备Si<sub>3</sub>N<sub>4</sub>颗粒雾化过程的影响

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Abstract In the process of preparing Si₃N₄ particles by dry granulation, volume of fluid (VOF) method and realizable k-ε model (k is turbulent kinetic energy, ε is dissipation rate) in turbulence model were used to simulate and calculate the influence of the deflection angle α of the nozzle inlets on air core, atomization cone angle and adhesive velocity at nozzle outlet. The experimental verification of Si₃N₄ ceramic particles prepared by dry granulation was carried out. The results show that when the deflection angle α increases from 0° to 30°, the area of air core in nozzle increases from about 18% to 25%. The mean diameter of air core increases, and the velocity gradient of binder at nozzle outlet increases from 4.43-5.06 m/s to 5.69-6.32 m/s. The spray cone angle increases from 63° to 74° and then the breakup process of the liquid film can be accelerated. When the deflection angle increases to 45°, the average diameter of the air core, the velocity of adhesive at the nozzle outlet and the atomization cone angle are the minimum. The experimental results show that the particle size of Si₃N₄ is the smallest when the deflection angle of atomizer is 30°. The numerical results are in good agreement with the experimental results.

Key words： Si₃N₄ particles binder VOF method the deflection angle of nozzle inlets air core spray cone angle

Received: 26 September 2020 Published: 18 January 2021

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TQ174.5

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	Articles by authors
	LIAO Dahai
	FANG Yongzhen
	ZHOU Jiangen
	GAN Zhenhua
	FANG Changfu
	WU Nanxing

Cite this article:

LIAO Dahai,FANG Yongzhen,ZHOU Jiangen, et al. Effect of nozzle inlet angle on the atomization process of Si₃N₄ particles prepared by dry granulation[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(6): 527-537.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2020/V25/I6/527

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