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2006年中国机械工程学会年会暨中国工程院机械与运载工程学部首届年会

作者： SUN Daqing, CHEN Jimin, ZONG Xiaojun National Center of Laser Technology, Beijing University of Technology, Chaoyang, Beijing 100022, China

Laser sintering as an advanced manufacturing technology has been developed fast in the past years. It is an inevitable trend to adopt laser sintering metal powder material directly to make metal parts

关键词： Laser sintering optical tweezers metal powder micro fabrication.

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Producing High Purity Nickel metal powder from Nickel Wastes through Acidic Leaching by Sulfuric Acid

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Journal of metallic Material Research 2022年第2期5卷 19-26页

作者： Mohammad Bagher Oshrieh Khanali Nekouee Hasan Abbaszadeh Faculty of Materials and Manufacturing Technologies Malek Ashtar University of TechnologyIran

Nickel has found increasing application in electronic,automobile manufacturing,plating,and metal industries and so *** high quality metal powders to satisfy increasing demand for advanced materials is of very high *** are a few numbers of standard powder production *** acidic leaching has been applied in present *** acid has been used to leach nickel wastes of plating *** produce nickel oxide powder furnaces with no protecting atmosphere and to produce pure nickel powder,tube furnace with hydrogen atmosphere has been *** performed in the research are time,density of sulfuric acid,and amount of hydrogen *** analyze powders produced,EDS element analysis and to determine size of powder particles,SEM has been *** was shown by the results that the highest amount of nickel dissolution in sulfuric acid(98%)has taken place during one hour and there is a direct relationship between hydrogen peroxide amount and nickel dissolution in sulfuric acid.

关键词： Nickel metal powder Recovery Acidic leaching Sulfuric acid

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Reaction Sintering of Fe-Al powder Mechanically Activated

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International Journal of Minerals,metallurgy and Materials 1998年第4期12卷 233-236页

作者： Chengchang jia Xiaosen Lu Jun Zhao Zizhang Xie(Material Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China) (Beijing Hard metal Factory, Beijing 100055, China) Material Science and Engineering School University of Science and Technology Beijing Beijing 100083 China Beijing Hard metal Factory Beijing 100055 China

The mixture of Fe and Al powder was mechanically activated and sintered to study a non-melting methodof producing the intermetallics Fe3Al. High-energy ball milling was used as an activation method, X-ray diffractionand SEM were chosen to analyze the materials variation before and after activation and sintering, and hot press ofFe-Al powder was inveshgated to compare mechanical activation with sintering. The results show that combiningmechanical activation with reaction sintering can complete the transformation from pure Fe and Al powder to intermetallics. It is difficult to do the transformation by either mechanical activation or hot press.

关键词： intermetallic compound sintering metal powder mechanical activation

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Characterization of 17-4PH stainless steel powders produced by supersonic gas atomization

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International Journal of Minerals,metallurgy and Materials 2012年第1期19卷 83-88页

作者： Xin-ming Zhao Jun Xu Xue-xin Zhu Shao-ming Zhang Wen-dong Zhao Guo-liang Yuan National Engineering and Technological Research Center for Non-ferrous metals Composites General Research Institute for Non-ferrous Metals Beijing 100088 China Beijing COMPO Advanced Technology Co. Ltd. Beijing 100088 China

17-4PH stainless steel powders were prepared using a supersonic nozzle in a close-coupled gas atomization system. The characteristics of powder particles were carried out by means of a laser particle size analyzer, scanning electron microscopy （SEM）, and the X-ray diffraction （XRD） technique. The results show that the mass median particle diameter is about 19.15 prn. Three main types of surface microstructures are observed in the powders： well-developed dendrite, cellular, and cellular dendrite structure. The XRD measurements show that, as the particle size decreases, the amount of fcc phase gradually decreases and that of bcc phase increases. The cooling rate is inversely related to the particle size, i.e., it decreases with an increase in particle size.

关键词： gas atomization metal powder stainless steel metal injection molding

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