Redistribution Reactions in Blackglas™ During Pyrolysis and Their Effect on Oxidative Stability

Carbon-rich SiCN ceramics derived from phenyl-containing poly(silylcarbodiimides)

“…The 13 C NMR signal of the NCN unit is usually less intense and occurs at around 120-124 ppm. 1,10,24 In the present case it is completely obscured by the signals of the phenyl ring carbons.…”

“…This view has been completely revised, since studies on SiCO-carbon hybrids showed a much higher stability against crystallization and high-temperature resistance to oxidation than originally anticipated. 9,10 It was also reported that carbon-rich PDCs retain their amorphous character to higher temperatures than the carbon-poor PDC analogues. 11 Based on these investigations, it was concluded that the presence of carbon is essential for the inhibition of crystallization and lowering the carbothermal reactivity.…”

Kinetic model for the pyrolysis of polysiloxane polymers to ceramic composites

“…29 Hurwitz et al 1995 andMeador et al 1996 used Si Ž . NMR nuclear magnetic resonance spectroscopy to study the high-temperature processing regime for these materials.…”

“…evolved gases in the resin Dente and Ranzi, 1983 . Proper control of the rate of pyrolysis and postcure temperature may enable one to minimize microcracks and pores and to relate changes in the composition of the matrix to the physical and Ž mechanical properties of the final product Hurwitz et al, . 1995;Meador et al, 1996;Wang et al, 2000 . Ž A lumped parameter model was previously developed An-.…”

Thermal redistribution reactions of Blackglas™ ceramic

“…The redistribution reaction between SiC and SiO does not lead to the loss of small organosilicon molecules, but results in inhomogeneous glass. When heated at a temperature of 900–1350°C, the silicon oxycarbide phase is known to undergo redistribution reactions with a constant char yield 5, 13–27. The thermal redistribution reactions change the microstructure of black glass, which affects the mechanical, thermal, and oxidative properties.…”