Enea Ente Per Le Nuove Technologie, L'energia E L'ambiente

Snial Resine Poliestere S.p.a.

Comitoto Nazionale Per L'energia Nucleare

Aldo Donato

Aldo Cipriani

Giancarlo Carignani

Elvio Bertotti

Stefano Martelli

Gianni D'Alessandro

Alberto Ortona

Carlo Alberto Nannetti

Amedeo Masci

Sergio Casadio

Sabina Botti

Giuseppe Grossi

Antonio Alessandro Licciulli

Elisabetta Borsella

Luigi Arcuri

Ceramic matrix composites (CMC) of high density, preferably of the type SiC/SiC, are provided by a production process based on the infiltration of ceramic fiber cloths with a polymeric precursor solution containing, as fillers, inert powders having size much lower than the mean distance among the ceramic fibers 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 alternative process comprises a brief (&lt;24 hours) treatment of infiltration of SiC from the vapor phase (CVI) with precursors and typical operative parameters for the deposition of silicon carbide followed by the repeated thickenings.

Process for producing ceramic matrix composites by liquid infiltration

A composition of matter suitable for solidifying radioactive wastes is formed of unsaturated polyester resins comprising a polyester (I) obtained polycondensing (a) maleic anhydride and/or maleic and/or fumaric acid, (b) isophthalic and/or terephthalic acid, (c) neopentylglycol, (d) optionally one or more conventional glycols, wherein the amount of (c) is at least 50% by moles with respect to (c)+(d); another polyester (II) obtained polycondensing (a) maleic anhydride and/or maleic and/or fumaric acid, (b) isopropylidene-bis-(phenylene-oxypropanol-2), (c) optionally one or more conventional glycols, wherein the amount of (b) is at least 50% by moles with respect to (b)+(c); an ethylenically unsaturated monomer (III) capable of copolymerizing with (I) and (II); inhibitors, initiators, accelerators, glass fibers and other conventional additives and fillers the weight ratio of component (I) to (II) being from 100:0 to 20:80.

Composition of matter suitable for solidifying radioactive wastes,

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Aldo Donato