Polymer derived ceramic fibers having improved thermal stability

The present invention relates to ceramic fibers of the Si-C-N-O series with a diameter less than about 20 micrometers. It has been unexpectedly found that the thermal stability of these fibers can be increased by minimizing the impurity content, primarily the content of metals or metallic compounds....

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	RABE, JAMES ALAN, FREEMAN, HARVEY ALBERT, LI, CHI-TANG, LIPOWITZ, JONATHAN, LANGLEY, NEAL ROGER
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS ARTIFICIAL STONE CEMENTS CERAMICS CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS CONCRETE LIME, MAGNESIA METALLURGY NATURAL OR ARTIFICIAL THREADS OR FIBRES ORGANIC MACROMOLECULAR COMPOUNDS REFRACTORIES SLAG SPINNING TEXTILES THEIR PREPARATION OR CHEMICAL WORKING-UP TREATMENT OF NATURAL STONE USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS
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Beschreibung
Zusammenfassung:	The present invention relates to ceramic fibers of the Si-C-N-O series with a diameter less than about 20 micrometers. It has been unexpectedly found that the thermal stability of these fibers can be increased by minimizing the impurity content, primarily the content of metals or metallic compounds. Such fibers with low levels of contaminants retain greater than about 60 percent of their initial tensile strength when subjected to temperatures of 1300-1400 DEG C for at least 30 minutes in a non-oxidative environment.