Papers by Keyword: Plasma Spheroidization

Abstract: GH3536 superalloy powder was prepared by the plasma spheroidization. The powder characteristics and effects of the plasma power on the percento spheroidization were studied.The phase and morphological properties of the powder were characterized by scanning electron microscope (SEM),Malven M4 particle size and shape analyzer and Leco ON736 oxygen-nitrogen analyzer.The results show that GH3536 fine spherical powder has favorable dispersity, smooth surface and high spheroidizing rate of 99%.The particle size distribution of the powder is narrowed,and the apparent density and tap density are significantly increased,which can meet the requirements of addictive manufacturing.

Abstract: Ti/Al(Ti-50at.%Al) composite powders were prepared by high-energy ball milling followed by reaction sintering heat treatment at 550°C ~ 650°C for 2 hours. Mechanical alloying of TiAl had been performed in a high energy plant ball after different milling times and pre-sintered at different temperatures. The particle sizes of Ti/Al powders were analyzed by scanning electron microscopy (SEM). X-ray diffraction (XRD) analysis was performed for microstructural characterization. The results show that microstructural and morphological changes of high energy milled powder are studied as a function of milling time. Over 600°C TiAl powders are completely alloyed by being sintered at different temperatures. The powders are mainly composed of γ-TiAl as well as a small amount of AlTi3. The TiAl alloy powders of high energy ball mill/2h and sintered at 650°C/2h get plasma spheroidization. Spheroidizing powders with fine texture, γ-TiAl and AlTi₃ phase, particle size of 10~40μm are obtained.