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Kwon, Young-Soon,Kim, Ji-Soon,A. Gromov, Alexander,Hong, Moon-Hee The Korean Powder Metallurgy Institute 2004 한국분말재료학회지 (KPMI) Vol.11 No.2
The passivation and oxidation process of tungsten and molybdenum narlopowders, produced by electrical explosion of wires was studied by means of FE-SEM, XPS. XRD, TEM, DIA-TGA and sire distribution analysis. In addition, the phase transformation of W and Mo nanopowders under oxidation in air was investigated. A chemical process is suggested for the oxidation of W and Mo nano-particles after a comprehensive testing of passivated and oxidized powders.
Anton Yu. Nalivaiko,Dmitriy Yu. Ozherelkov,Ivan A. Pelevin,Stanislav V. Chernyshikhin,Andrey E. Medvedev,Andrey V. Korshunov,Alexey N. Arnautov,Alexander A. Gromov 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.3
The synthesis features for 3D samples of AlSi10MgCualloy were investigated. Two types of samples were used: single tracksand cubic samples of 10 mm3volumes obtained by selective laser melting. 3D printing regimes and samples characteristicswere compared for both types of samples. A comprehensive characterization of the initial AlSi10MgCualloy powder wasperformed. The morphology, microstructure, and micro-hardness of the obtained single tracks and cubic samples werestudied. The mechanism of the porosity formation was discussed in detail. A formation of pores and non–uniform structureswas evidently caused by non–equilibrium crystallization during the selective laser melting process, namely 3D samples fastcooling. The lower porosity and the more uniform structure were obtained with higher values of laser power (from 220 to240 W) Values of laser power had a crucial influence on the morphology and microstructure of the obtained 3D material. Optimal modes for selective laser melting for experimental AlSi10MgCupowder were revealed based on the microstructureand micro-hardness data. The values of the micro-hardness were varied from 115.5 to 151.1 HV. The micro-hardness forsamples was increased on average by 20 HV after additional heat treatment. It was caused, most probably, by the separationof the Al2Cuphase.