Refractory composite materials protected against oxidising at high temperature, precursors of the said materials, their preparation
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United States of America Patent
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Dec 18, 2001
Grant Date -
N/A
app pub date -
Apr 21, 1999
filing date -
Jun 19, 1996
priority date (Note) -
Expired
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Abstract
The present invention provides: refractory composite materials protected against oxidation at high temperature; said materials are of the type made by a solid process and include, in characteristic manner, over their entire outside surface, a complex layer containing at least one silicate corresponding to a densification additive used to make them, silica, and a vitreous boron-containing silicate phase; precursors or intermediates for preparing said materials; said precursors including, in characteristic manner, over their entire outside surface, at least one layer of a precursor for borosilicate glass or a layer of borosilicate glass; and a method of preparing said materials (by preparing said precursors) and a method of preparing said precursors.
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