SiAlON ceramics from preceramic polymers and nano-sized fillers: Application in ceramic joining

Structure properties relationship in silicon oxycarbide glasses obtained by spark plasma sintering

“…In the case of Al 2 O 3 reinforced samples, the formation of a mullite phase is common in this kind of materials and was also corroborated through infrared spectroscopy [12,20,21]. The formation of mullite inhibits the devitrification of the amorphous matrix [20] and gives as a result a decrease of the pure silica phase available to react with the free carbon phase in the carbothermal reduction.…”

“…2b), but the absence of the aluminum carbide-derived bands indicates that there are no reaction between the Al and C atoms, as occurs at low sintering temperatures when using aluminum as a filler and conventional ceramic route [7]. However, the presence of a sharp peak at 1160 cm À 1 in the spectra on the Al 2 O 3 reinforced samples is interpreted as a sign of formation of a mullite phase, as several authors reported [12,20,21]. Raman spectra of all the obtained nanocomposites show the typical bands of carbon-containing materials, the D and G bands in the first order spectra, and the non resolved resonance modes of the second order spectra, characteristics of highly disordered structures (Fig.…”

“…In this sense, composites of silicon carbide reinforced with nanofillers such as alumina [8] or carbon [9][10][11] allows selective modification of the mechanical and tribological properties of the ceramic material. Sglavo et al [8] obtained ceramic laminates of alumina/silicon carbide with an excellent adhesion and higher strength values than SiAlON ceramics obtained from preceramic polymers [12]. Toma et al [7] took the advantage of the reactions involved in the reactive pyrolysis to obtain piezoresistive SiOC-based ceramics reinforced with active aluminum fillers [13].…”

Multifunctional advanced ceramics from preceramic polymers and nano-sized active fillers

“…processing conditions adopted can be found in the published literature. 29,[33][34][35][36][37] After forming, the composite preceramic materials were heat treated in different conditions (air, nitrogen, nitrogen/2% H 2 atmosphere; heating temperature ranging from 800 to 1550 • C; heating rate ranging from 2 to 20 • C/min; dwelling time at temperature ranging from 1 to 4 h) to obtain ceramic materials with the desired composition (oxides or oxynitrides).…”

“…27,28 Recently, we conducted a series of experiments with the aim of producing oxygen-containing advanced engineering ceramics from preceramic polymers and nano-sized oxide fillers. [29][30][31][32][33][34][35][36][37] The oxide fillers react with the decomposition products of the preceramic polymer (pure silica, when processing in air) producing the desired new phases, and their small dimension allows for very favorable reaction kinetics with the formation, in selected conditions, of phase pure ceramics at low temperature. 29,30 This can therefore be considered a novel direction for filler-containing preceramic polymer components, in which the fillers react to give a single phase ceramic material at the same time enabling the production of crack-free bulk components, while retaining (at least to a certain extent) the processability characteristics of preceramic polymers.…”