Pressureless sintering of beta silicon carbide nanoparticles

Firing membranes

“…The production of CO 2 would be the result of only two carbon atoms reacting with the silica. The reaction between silica and silicon carbide is reported to be inhibited at these temperatures in the presence of free carbon [33].…”

“…Two silica and two organosilica films were not thermally treated, but they were examined for their mechanical properties by nanoindentation using a CSM indentation system. The mechanical properties from the load-displacement data were evaluated using the procedures outlined in the references [33,34]. For the nano-indentation measurements, a substrate-correction method can be performed to minimize the substrate effect [35].…”

“…The apparent drop in the methane release at 625 °C can be assigned to the thermo-oxidation of the methane [33]. The weight loss rate goes down to zero only at temperatures approaching 1000 °C.…”

“…To avoid residues, a polymer with a low charring tendency can be sought [33]. Although the charring tendency of polymers has been well studied and documented [21], the 'spinnability' of polymers limits widespread adoption of binders other than PES [33].…”

“…The true onset for long(er) dwell times will be significantly lower, and can be questioned whether the organic moiety is stable at any temperature beyond 400 °C for longer periods of time. Nonetheless, in some studies the temperatures used to treat organosilica materials heavily exceed 400 °C [30,33]. A slight decomposition of the organic moiety then seems inevitable, but is not necessarily a problem: as was demonstrated in Chapter 4, the decomposition of the organic moiety from BTESE follows a pathway starting with the scission of the carbon-carbon bonds in the material.…”