NDLI: Characteristics of a tungsten film electrodeposited in a KF–B$_{2}$O$_{3}$–WO$_{3}$ melt and preparation of W–Cu–W three-layered films for heat sink application

Content Provider	Springer Nature Link
Author	Nitta, Koji hira, Toshiyuki Hagiwara, Rika Majima, Masatoshi Inazawa, Shinji
Copyright Year	2010
Abstract	A tungsten film of 13 μm in thickness was obtained on a copper substrate by galvanostatic electrolysis at 30 mA cm$^{−2}$ for 40 min in a KF–B$_{2}$O$_{3}$–WO$_{3}$ (67:26:7 mol%) melt at 850 °C. By cross-sectional scanning electron microscopy observation and energy dispersive X-ray analysis, the tungsten layer was found to be compact and free from cracks, voids and melt inclusion. The X-ray diffractometry analysis revealed that the phase was α-tungsten, and that (222) plane was significantly oriented parallel to the substrate. By nanoindentation, its hardness was found to be 8.4 GPa, which was larger than that of single crystal tungsten. Its Young’s modulus was measured to be 410 GPa, which was similar with the reported value of single crystal tungsten. Its coefficient of linear thermal expansion and thermal conductivity were 4.5 × 10$^{−6}$ K$^{−1}$ and 178 W m$^{−1}$ K$^{−1}$, respectively, which were similar values for the tungsten produced by a conventional powder metallurgy method. Finally, W–Cu–W three-layered films were prepared for a heat sink application. It was confirmed that a three-layered film having a desired coefficient of linear thermal expansion can be prepared easily by this new molten salt method.
Starting Page	1443
Ending Page	1448
Page Count	6
File Format	PDF
ISSN	0021891X
Journal	Journal of Applied Electrochemistry
Volume Number	40
Issue Number	8
e-ISSN	15728838
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-04-10
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Tungsten Molten salt Electrodeposition Linear thermal expansion Industrial Chemistry/Chemical Engineering Physical Chemistry Electrochemistry
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Chemical Engineering Electrochemistry

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