Silicon Oxycarbide Glasses from Sol-Gel Precursors

1992 ◽  
Vol 271 ◽  
Author(s):  
F. Babonneau ◽  
G. D. Soraru ◽  
G. D'Andrea ◽  
S. Dire ◽  
L. Bois
Keyword(s):  
Carbon Content ◽  
Sol Gel ◽  
Mas Nmr ◽  
Silicon Oxycarbide ◽  
Suitable Choice ◽  
Pyrolysis Process ◽  
Strong Decrease ◽  
Pure Silicon ◽  
Silicon Alkoxides ◽  
Silicon Oxycarbide Glasses

ABSTRACTSilicon oxycarbide glasses have been prepared from sol-gel precursors containing not only Si-CH3, but also Si-H bonds. Three systems have been chosen containing various Si units but the same C/Si ratio. Their pyrolysis process has been mainly followed by 29Si MAS-NMR and the composition of the final glass extracted. This study shows that a suitable choice of Si-CH3 and Si-H functionnalized silicon alkoxides can lead to a strong decrease in the free carbon content and to an almost pure silicon oxycarbide phase.

Synthesis and Characterization of Silicon Oxycarbide Derived Nanocomposites Obtained through Ceramic Processing of TEOS/PDMS Preceramic Materials

2011 ◽  
Vol 14 ◽  
pp. 27-38 ◽  
Author(s):  
J.L. Oteo ◽  
M. Alejandra Mazo ◽  
Cristina Palencia ◽  
F. Rubio ◽  
Juan Rubio
Keyword(s):  
Silicon Carbide ◽  
Sol Gel ◽  
Silica Matrix ◽  
Silicon Oxycarbide ◽  
Glassy Matrix ◽  
Ceramic Processing ◽  
Carbon Phase ◽  
Graphite Phase ◽  
Sol Gel Process ◽  
Silicon Oxycarbide Glasses

Bulk silicon oxycarbide derived ceramic nanocomposites have been prepared by the application of the conventional ceramic processing to preceramic materials. Tetraethylortosilicate/ polydimethylsiloxane preceramic materials obtained by sol-gel process were thermally treated and attrition milled to 4 micrometers. Subsequently, the preceramic powders were pyrolized at 1100 °C to obtain silicon oxycarbide powders that were pressed and sintered at 1550 °C up to 16 hours. Silicon oxycarbide glasses obtained at 1100 °C from pyrolysis of preceramic materials consist of a Si-O-C network and a carbon like graphite phase well dispersed. At annealing temperatures higher than 1100°C silicon oxycarbide glasses undergo a rearrangement which involves a phase separation to silica and silicon carbide and a segregation of carbon like graphite phase. At these temperatures the material can be considered as a glassy matrix nanocomposite. At temperatures higher than 1500 °C the carbothermal reduction occurs with the consumption of both silica and free carbon phase. However, the nanocomposite structure is maintained but with different constituents. The silicon oxycarbide glasses obtained at 1100 °C are amorphous. However, as a result of all involving processes taken place during the ceramic process, the nanocomposites formed at 1550 °C comprise a silica matrix and nanodomains of carbon like graphite and silicon carbide both of them displaying an incipient crystallization. Structure and crystalline size evolution, from preceramic materials to silicon oxycarbide derived nanocomposites, have been determined by FT-IR and Raman spectroscopies, XRD and 29Si-MASNMR.

Optimization of sol–gel/pyrolysis routes to silicon oxycarbide glasses

2012 ◽  
Vol 358 (20) ◽  
pp. 2771-2782 ◽  
Author(s):  
Adam Strachota ◽  
Martin Černý ◽  
Zdeněk Chlup ◽  
Miroslav Šlouf ◽  
Jiřina Hromádková ◽  
...  
Keyword(s):  
Sol Gel ◽  
Silicon Oxycarbide ◽  
Silicon Oxycarbide Glasses

Surface Energy of Sol Gel-Derived Silicon Oxycarbide Glasses

2011 ◽  
Vol 94 (12) ◽  
pp. 4523-4533 ◽  
Author(s):  
Aitana Tamayo ◽  
Raquel Peña-Alonso ◽  
Juan Rubio ◽  
Rishi Raj ◽  
Gian D. Sorarù ◽  
...  
Keyword(s):  
Surface Energy ◽  
Sol Gel ◽  
Silicon Oxycarbide ◽  
Silicon Oxycarbide Glasses

High Temperature Stability of Oxycarbide Glasses

1992 ◽  
Vol 271 ◽  
Author(s):  
Hanxi Zhang ◽  
Carlo G. Pantano
Keyword(s):  
High Temperature ◽  
Hydrogen Concentration ◽  
Network Structure ◽  
Sol Gel ◽  
Temperature Stability ◽  
Silicon Oxycarbide ◽  
High Temperature Stability ◽  
Sol Gel Process ◽  
Silicon Oxycarbide Glasses ◽  
The Stability

ABSTRACTThe stability of silicon oxycarbide glasses has been studied at temperatures up to 1500°C. The silicon oxycarbide glasses were synthesized using a sol/gel process. The pyrolysis treatment in argon influenced the structure and composition of the synthesized glasses, and in turn, their high temperature stability in oxidizing atmosphere. The oxycarbide glasses pyrolyzed at > 1000°C had lower hydrogen concentration and a more polymerized network structure, and thereby were more resistant to oxidation and crystallization at higher temperatures.

Silicon Oxycarbide Glasses from Gel Hybrid Structures

2008 ◽  
Vol 39-40 ◽  
pp. 77-80
Author(s):  
Y.Y. Ivanova ◽  
Y.E. Vueva
Keyword(s):  
Metal Atom ◽  
Hybrid Structure ◽  
Nanocomposite Materials ◽  
Mas Nmr ◽  
Silicon Oxycarbide ◽  
Hybrid Structures ◽  
N2 Atmosphere ◽  
Bet Analysis ◽  
Silicon Oxycarbide Glasses ◽  
Cp Mas Nmr

Multicomponent (Ti, Zr, Al, B) silicon oxycarbide glasses and nanocomposite materials were derived after pyrolysis of gel hybrid structures in N2 atmosphere. MTES (methyltriethoxysilane) and PDMS (polydimethylsiloxane) were used as precursors for introducing “organic” SiO2. Transformation of the hybrid structure into oxycarbide was followed by SEM, FTIR, 29Si CP MAS NMR, BET analysis. Silicon oxycarbide structure is strongly influenced from the concentration and nature of modifying metal atom.

Mechanical Characterization of Sol-Gel-Derived Silicon Oxycarbide Glasses

1996 ◽  
Vol 79 (8) ◽  
pp. 2074-2080 ◽  
Author(s):  
Gian Domenico Soraru ◽  
Elisabetta Dallapiccola ◽  
Gennaro D'Andrea
Keyword(s):  
Mechanical Characterization ◽  
Sol Gel ◽  
Silicon Oxycarbide ◽  
Silicon Oxycarbide Glasses
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