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Stability of Refractories in Hydrogen‐Fluorine Flames
Author(s) -
EBNER M.
Publication year - 1961
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.1151-2916.1961.tb15338.x
Subject(s) - graphite , fluorine , materials science , hydrogen , silicon carbide , cubic zirconia , carbide , stoichiometry , chemical engineering , ceramic , composite material , metallurgy , chemistry , organic chemistry , engineering
The flame resistance of six refractories of commercial purity was measured in the well‐mixed stoichiometric portion and in the unmixed fluorine‐rich portion of a hydrogen‐fluorine diffusion flame. Graphite, silicon carbide, zircon, alumina, zirconia, and magnesia are decreasingly resistant to the test flame in the order indicated. The rate of ablation is about three times more rapid and the average surface temperatures are 130° to 745° C. higher where the flame is fluorine‐rich. Graphite and silicon carbide are suggested for use in HF flames because of their good thermal‐shock resistance and relative chemical inertness to the flame. Consideration of the ablation chemistry indicates that zircon dissociates and then, like graphite, silicon carbide, and zirconia, ablates by flame‐solid reaction, whereas alumina and magnesia form liquids which flow from the impingement area.