Experimental Investigation of the Oxidation Behaviour of SiSiC Foams

Early-stage oxidation behavior at high temperatures of SiSiC cellular architectures in a porous burner

“…One strut was extracted from each porous architecture and pulverized for the XRD tests. As a result the signal from the oxide phases is quite low, nevertheless we detected the same phases shown in the literature [6,7,17]. Due to silicon alloy formation and loss, peripheral strut rupture during the thermal treatment in the porous burner of the most delicate structures, the recorded mass change data were not reliable and thus not reported in detail.…”

“…Indeed, porous SiSiC has proven to withstand long operating conditions in a combustion environment [6,7]. It has been noted that foams' behavior is strongly affected by the way they interact with the environment during the very initial phases of operation.…”

“…Oxide scale foaming during long lasting operational conditions slows down the gasses flow in the pores with a subsequent local overheating and degradation of the material [6]. It is thus very important to understand what triggers this phenomenon as it impacts the life span of porous ceramic burners' components.…”

“…There are several works in the literature concerning oxidation of SiC (sintered and CVD) and silicon; few of them consider the case of SiSiC by reactive silicon infiltration [6,12,[25][26][27]. There is a lack in studies on the effect of oxidation on macro porous materials in a flowing gas caused by combustion.…”

Reactive silicon infiltration of carbon bonded preforms embedded in powder field modifiers heated by microwaves

“…It consists in the use of Si-SiC foam bodies produced by the replica of polyurethane foams with polymeric and SiC slurries followed by pyrolysis and reactive silicon infiltration (RSI) [8]. These materials possess unique thermo-mechanical behaviour [9,10] such as high thermal shock resistance.…”