FILLED THERMOPLASTIC B-STAGE PITCH PREFORM AND COMPOSITE MADE THEREFROM

PROBLEM TO BE SOLVED: To obtain a filled thermoplastic B-stage pitch preform freed from voids and cracks and having an improved bulk density by mixing a powdery filler with a mesophase pitch. SOLUTION: 6-80wt.% powdery filler 11' is mixed with 94-20wt.% mesophase pitch 12' by means of a mi...

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Hauptverfasser:	LEONARD SIDNEY SINGER, DAVID THOMAS ORIENT
Format:	Patent
Sprache:	eng
Schlagworte:	ARTIFICIAL STONE CEMENTS CERAMICS CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS COMPOUNDS THEREOF CONCRETE FUELS INORGANIC CHEMISTRY LIME, MAGNESIA LUBRICANTS METALLURGY NON-METALLIC ELEMENTS ORGANIC MACROMOLECULAR COMPOUNDS PEAT PETROLEUM, GAS OR COKE INDUSTRIES PYROLIGNEOUS ACID REFRACTORIES SLAG TECHNICAL GASES CONTAINING CARBON MONOXIDE THEIR PREPARATION OR CHEMICAL WORKING-UP TREATMENT OF NATURAL STONE USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS WORKING-UP PITCH, ASPHALT, BITUMEN, TAR
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To obtain a filled thermoplastic B-stage pitch preform freed from voids and cracks and having an improved bulk density by mixing a powdery filler with a mesophase pitch. SOLUTION: 6-80wt.% powdery filler 11' is mixed with 94-20wt.% mesophase pitch 12' by means of a mixer 20 to obtain a thermoplastic composition. This mixture is poured into a container 22, and the container 22 is placed in a heater 25 and heated to 300-400 deg.C in an inert atmosphere to fuse the pitch. The container is further heated to 40-500 deg.C to react the pitch to such a high extent that it can show a TMA distortion temperature of 400 deg.C or above. The obtained B-stage filled thermoplastic pitch 27 is withdrawn from the container 22 to obtain a B-stage filled thermoplastic sheet 28. Next, a powdery substance 29 obtained by grinding the sheet 28 is molded into a preform having a desired shape, and this preform is carbonated by heating to 1,000 deg.C or above to obtain a carbon/carbon composite material.