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Effect of Carbon and Water on Wetting and Reactions of B 2 O 3 ‐Containing Glasses on Platinum
Author(s) -
HOLMQUIST GLENN A.,
PASK JOSEPH A.
Publication year - 1976
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1976.tb09501.x
Subject(s) - wetting , contact angle , sessile drop technique , platinum , torr , adsorption , water vapor , materials science , carbon fibers , drop (telecommunication) , vapor pressure , surface energy , metal , analytical chemistry (journal) , chemistry , inorganic chemistry , catalysis , composite material , metallurgy , thermodynamics , organic chemistry , telecommunications , physics , composite number , computer science
Sessile‐drop experiments were conducted to analyze the wetting characteristics of molten B 2 O 3 and B 2 O 3 ‐containing glasses on Pt. In atmospheres free of carbonaceous gases, the contact angle for all glasses on Pt was small and invariant under ambient pressures of 10 ‐4 torr to 1 atm for the range 700° to 1000°C. Adsorption of carbon at the metal surface decreased the solid/vapor surface energy and increased the contact angle. Carbon was removed by oxidation at a specific ambient pressure, resulting in a reduction in the contact angle. Temperature‐pressure data are reported for Pt. Absorption of water vapor by the glasses resulted in a reaction at the solid/liquid interface, spreading of the glass, and adherence. The possible reactions that can occur are given.