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Impact mechanism of gas temperature in metal powder production via gas atomization

Chinese Physics B 2021年第5期30卷 437-451页

作者： Peng Wang Jing Li Xin Wang Bo-Rui Du Shi-Yuan Shen Xue-Yuan Ge Miao-Hui Wang State Key Laboratory of Advanced Forming Technology and Equipment China Academy of Machinery Science&TechnologyBeijing 100083China Beijing National Innovation Institute of Lightweight Ltd Beijing 100083China

This paper aims at studying the influence mechanism of gas temperatures(300 K,400 K,500 K,and 600 K)on gas atomization by simulating the integral atomization process of the close-coupled nozzle in vacuum induction gas atomization(VIGA).The primary atomization is simulated by the volume of fluid(VOF)approach,and the second atomization is studied by the discrete phase model(DPM)combined with the instability breakage *** results show that,at an increased gas temperature,the influences of gas-liquid contact angle and gas temperature in the recirculation zone on the primary atomization are virtually ***,increasing the gas temperature will increase the gas-liquid relative velocity near the recirculation zone and decrease the melt film thickness,which are the main reasons for the reduced mass median diameter(MMD,d50)of primary atomized *** the secondary atomization,increasing the gas temperature from 300 K to 600 K results in an increase in the droplet dispersion angle,which is beneficial to the formation of spherical metal *** addition,increasing the gas temperature,the positive effect of gas-liquid relative velocity increase on droplets refinement overweighs the negative influence of the GMR decrease,resulting in the reduced MMD and diameter distribution *** the analysis of the atomization mechanism,the increase in atomization efficiency caused by increasing the temperature of the atomizing gas,including primary atomization and secondary atomization,is mainly due to the increase in the gas drag force difference between the inner and outer sides of the annular liquid film.

关键词： metallic powders VIGA technology argon temperature two-phase flow

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Surfactant Assisted Dispersion and Adhesion Behavior of Carbon Nanotubes on Cu—Zr and Cu—Zr—Al Amorphous powders

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Journal of Materials Science & Technology 2014年第9期30卷 847-853页

作者： Jonathan Nguyen Haiming Wen Zhihui Zhang Frank Yaghmaie Enrique Lavernia Department of Chemical Engineering and Materials Science University of California at DavisDavis CA 95616 USA Northern California Nanotechnology Center University of California at DavisDavis CA 95616 USA

Carbon nanotubes （CNTs） were dispersed in gas atomized Cu47.5Zr47.5Al5 （CZA） and CusoZrso （CZ） amorphous powders, in an effort to elucidate the mechanisms of adhesion of CNTs onto amorphous metallic powders. CNTs were homogenously dispersed in water using a zwitterionic （ZW） surfactant. Then CZA and CZ powders were submersed in the ZW-CNTsuspensions with varying amounts of dwell time in an ultrasonic bath. The ZW-CNT- metal powder suspensions were dried, and CNT-metal composite powders were obtained after decomposition of the surfactant by calcination. Zeta potential measurements on ZW-CNT-metal powder suspensions and scanning electron microscopy investigation into the CNT-metal composite powders both indicated an ideal dwell time, for a specific alloy composition, of metallic powders in ZW-CNT suspension to achieve optimal adhesion of CNTs onto amorphous metallic powder surfaces. The results are rationalized on the basis of hydrolysis of metal ions into suspension creating a net positive charge on the metallic powder surfaces, and the interaction between the charged powder surfaces and the charged hydrophilic head groups of ZW, which has the other end attached to CNTs.

关键词： metallic powders Carbon nanotubes Dispersion Surfactant Hydrolysis

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