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Microwave-assisted fabrication of titanium hollow spheres with tailored shell structures for various potential applications

: Yu, P.; Stephani, G.; Luo, S.D.; Goehler, H.; Qian, M.


Materials letters 86 (2012), S.84-87
ISSN: 0167-577X
Fraunhofer IFAM, Institutsteil Pulvermetallurgie und Verbundwerkstoffe Dresden ()

Expanded polystyrene spheres are spray-coated with a Ti-7Ni-0.5B-binder slurry. The polystyrene core and binder are thermally removed and the resulting Ti-7Ni-0.5B shells are sintered by microwave radiation to produce titanium hollow spheres. Samples sintered at <= 1120 degrees C result in individual hollow spheres with permeable shells, while sintering at higher temperatures lead to an interconnected hollow-sphere structure with solid shells.