Premium
Oxygen Evolution During MnO‐Mn 3 O 4 Dissolution in a Borosilicate Melt
Author(s) -
LUCKTONG CHARTRE,
HRMA PAVEL
Publication year - 1988
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.1151-2916.1988.tb05048.x
Subject(s) - borosilicate glass , frit , pellets , dissolution , volatilisation , materials science , thermogravimetry , oxygen , metallurgy , mineralogy , pellet , analytical chemistry (journal) , chemical engineering , composite material , chemistry , inorganic chemistry , chromatography , organic chemistry , engineering
Foam evolution during dissolution of MnO‐Mn 3 O 4 pellets and powders in borosilicate glass was recorded photographically. The pellets were placed horizontally in transparent crucibles, covered with molten glass, and held at 1150°C. If the Mn 3 O 4 content in pellets was more than 31 wt%, they developed foam after an initial foamless period. The length of the foamless period decreased and the duration of foaming increased as the Mn 3 O 4 content increased. Batches prepared from MnO‐Mn 3 O 4 powders and frit, and soaked at 1150°C, foamed without an initial foamless period. The foam developed and collapsed before the set temperature was established within the melt and rose to a higher level than foam produced by pellets. Thermogravimetry of batches heated in 1 atm (∼10 5 Pa) of O 2 shows oxidation at 400° to 600°C followed by mass loss due to volatilization and oxygen evolution.