Ceramic matrix composites (CMC) of high density, preferably of the SiC/SiC type, are provided by a production process based on the infiltration of ceramic fibre cloths with a polymeric precursor solution containing, as fillers, inert powders having size much lower than the mean distance among the ceramic fibres which are used as basic material for the manufacturing of CMC, typically a nanometric granulometry. Such step is followed by the steps of hardening the cloths, pyrolysis of the polymer and repeated thickenings until the desired density is reached. A possible preliminary step consists of a brief (≤ 24 hours) treatment of infiltration of SiC from the vapor phase (CVI) with precursors and typical operative parameters for the deposition of silicon carbide.
Ceramic matrix composites and process for the production therof by liquid infiltration of ceramic polymeric precursors and use of nanometric powders
LICCIULLI, ANTONIO ALESSANDRO;
1997-01-01
Abstract
Ceramic matrix composites (CMC) of high density, preferably of the SiC/SiC type, are provided by a production process based on the infiltration of ceramic fibre cloths with a polymeric precursor solution containing, as fillers, inert powders having size much lower than the mean distance among the ceramic fibres which are used as basic material for the manufacturing of CMC, typically a nanometric granulometry. Such step is followed by the steps of hardening the cloths, pyrolysis of the polymer and repeated thickenings until the desired density is reached. A possible preliminary step consists of a brief (≤ 24 hours) treatment of infiltration of SiC from the vapor phase (CVI) with precursors and typical operative parameters for the deposition of silicon carbide.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
