Formation of tungsten borides studied by field ion microscopy

Journal Article · Wed Jul 01 00:00:00 EDT 1987 · J. Vac. Sci. Technol., A; (United States)

DOI:https://doi.org/10.1116/1.574771· OSTI ID:6423363

Ohmae, N; Nakamura, A; Koike, S; Umeno, M

Metallurgical transformation of a W filament into W/sub 2/B/sub 5/ or WB/sub 4/ was found in our field ion microscope observations of boron fibers. The W--boride formation at the B/W interface is of technological and industrial importance. Processes of the W--boride formation have been studied using field ion microscopy by sputter-depositing B films onto a W tip and by heating the tip at varied temperatures. Stable W/sub 2/B/sub 5/ was formed at heating temperatures higher than 1200 K. The formation of W/sub 2/B/sub 5/ /0001/ was found frequently on the W/011/. This may be caused by the small misfit between the locations of W atoms in bulk W and of those in borides. Characteristics in the He-ion image of W/sub 2/B/sub 5/ obtained in this study showed a resemblance to that previously observed at the core of boron fibers.

• Research Organization: Department of Precision Engineering, Faculty of Engineering, Osaka University, Suita, Osaka 565, Japan
• OSTI ID: 6423363
• Journal Information: J. Vac. Sci. Technol., A; (United States), Journal Name: J. Vac. Sci. Technol., A; (United States) Vol. 5:4; ISSN JVTAD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
BORIDES
BORON
BORON COMPOUNDS
ELEMENTS
FIBERS
FILAMENTS
INTERFACES
ION MICROSCOPY
METALS
MICROSCOPY
REFRACTORY METAL COMPOUNDS
SEMIMETALS
SPUTTERING
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TUNGSTEN
TUNGSTEN BORIDES
TUNGSTEN COMPOUNDS