Wettability of boron carbide

Book · Sat Dec 31 04:00:00 EST 1994

OSTI ID:445289

Torvund, T; Akselsen, O M; Ulvensoeen, J H ^[1]; Grong, O ^[2]

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1. SINTEF Metallurgy, Trondheim (Norway)
2. Norwegian Inst. of Tech., Trondheim (Norway). Dept. of Metallurgy

The wettability of boron carbide has been examined by means of the sessile drop method, using the following candidate alloys: (96wt%AG-4wt%Ti), (Ag-26.5wt%Cu-3wt%Ti), (Sn-10wt%Ag-4wt%Ti), Sn(99.95wt%) and Al(99.99wt%). The results show that B{sub 4}C is completely wetted by the Ag-based alloys. Sn-10wt%Ag-4wt%Ti alloy and pure Al partly wet the B{sub 4}C surface, while pure Sn does not wet B{sub 4}C at all. For all the alloys used, except pure Sn, a reaction layer was observed at the interface between the ceramic part and the metal drop. Although the spreading kinetics of the Al-drop was much slower compared with the Ti-containing alloys, the reaction rate was considerably higher in the former case. This suggests that aluminium is an attractive candidate material for brazing of B{sub 4}C. Formation of the low melting B{sub 2}O{sub 3} at the B{sub 4}C surface may cause oxidation of the filler metal during joining, which, in turn, leads to a low bond strength.

• OSTI ID: 445289
• Report Number(s): CONF-940367--; ISBN 0-87171-441-8
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM
BORON CARBIDES
BRAZING
CHEMICAL REACTIONS
COPPER ALLOYS
ELECTRON MICROPROBE ANALYSIS
EXPERIMENTAL DATA
INTERFACES
KINETICS
LIQUID METALS
SILVER ALLOYS
TIN
TIN ALLOYS
TITANIUM ALLOYS
WETTABILITY