Silicon Carbide from Laser Pyrolysis of Polycarbosilane

Jakubenas, Kevin J.; Marcus, Harris L.

doi:10.1111/j.1151-2916.1995.tb08653.x

Cited by 29 publications

(18 citation statements)

References 16 publications

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“…Pyrolysis can be performed via conventional oven annealing, 3 microwave, 4 or laser heating. 5 Polysiloxanes, polycarbosilanes, polysilanes, and polysilazanes are some of the preceramic polymers currently available commercially, and they allow one to produce SiO 2 , SiOC, SiC, Si 3 N 4 , and SiNC ceramics. Because of the large shrinkage occurring during the transformation, thin films or fibers have been the main products fabricated so far, but ceramic composites, foams, and joints have also been obtained.…”

Section: Introductionmentioning

confidence: 99%

Silicon Carbide Films by Laser Pyrolysis of Polycarbosilane

Colombo

Martucci

Fogato

et al. 2001

Journal of the American Ceramic Society

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Thin films of polycarbosilane were deposited on Si and SiO 2 substrates. Instead of conventional oven annealing (high temperatures, inert atmosphere), laser pyrolysis was used to achieve the polymer-to-ceramic conversion. In some conditions, especially when laser radiation absorption was enhanced by depositing a carbon layer on the surface of as-deposited films or by embedding graphite particles, this processing method yielded SiC ceramic coatings, without damaging the substrate. Processing in air or low vacuum did not result in oxidized coatings, contrary to what happens for oven pyrolysis. Laser-converted films were similar to oven-heated films processed at 1000°to 1200°C.

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Section: Introductionmentioning

confidence: 99%

Silicon Carbide Films by Laser Pyrolysis of Polycarbosilane

Colombo

Martucci

Fogato

et al. 2001

Journal of the American Ceramic Society

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“…8 The pyrolysis atmosphere can be varied from being inert (argon, helium, nitrogen, vacuum) to being reactive (ammonia, hydrogen, oxygen, air). Moreover, nonconventional heating systems (laser 9 or microwave heating 10,11 ) or even athermal conversion processes, such as ion bombardment of thin films, are just now beginning to be applied to the polymer route, and the results are very promising. 12,13 This paper describes a comparative investigation of conventional oven heating and microwave hybrid heating of preceramic polymers to obtain SiC, SiOC, and SiNC ceramics.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Microwave Hybrid and Conventional Heating of Preceramic Polymers to Form Silicon Carbide and Silicon Oxycarbide Ceramics

Danko

Silberglitt

Colombo

et al. 2000

Journal of the American Ceramic Society

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Six different preceramic polymers were pyrolyzed via conventional and microwave hybrid heating; these polymers provide a range of carbon content and local atomic coordination. The products were compared with each other using X-ray diffractometry and transmission electron microscopy. Nanocrystalline ␤-SiC was the principal crystal phase detected, and the amount and size of the nanocrystals increased as the processing temperature increased. Differences were observed in the amount and size of the ␤-SiC nanocrystals and the graphitization of residual carbon between the microwave hybrid heating and the conventional oven heating of polycarbosilanes. Conventional heating of a high-carbon polysiloxane in an oven (in flowing argon) produced a greater amount of ␤-SiC from carbothermal reduction at high temperature. Microwave hybrid heating led to better ␤-SiC nanocrystal development for polyureasilazane.

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“…It has been recently identified that unconventional methods like laser treatment [128,129] and ionizing radiation by means of electron beam or gamma rays [130][131][132][133] can also be used to treat the preceramic polymers. These processes offer advantage of processing at ambient temperature, which is crucial for polymers with low softening, melting, or decomposition temperatures.…”

Section: Cross-linking Of Polysiloxanesmentioning

confidence: 99%

Processing of polysiloxane-derived porous ceramics: a review

Kumar

Kim

2010

Science and Technology of Advanced Materials

112

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Because of the unique combination of their attractive properties, porous ceramics are considered as candidate materials for several engineering applications. The production of porous ceramics from polysiloxane precursors offers advantages in terms of simple processing methodology, low processing cost, and easy control over porosity and other properties of the resultant ceramics. Therefore, considerable research has been conducted to produce various Si(O)C-based ceramics from polysiloxane precursors by employing different processing strategies. The complete potential of these materials can only be achieved when properties are tailored for a specific application, whereas the control over these properties is highly dependent on the processing route. This review deals with processing strategies of polysiloxane-derived porous ceramics. The essential features of processing strategies-replica, sacrificial template, direct foaming and reaction techniques-are explained and the available literature reports are thoroughly reviewed with particular regard to the critical issues that affect pore characteristics. A short note on the cross-linking methods of polysiloxanes is also provided. The potential of each processing strategy on porosity and strength of the resultant SiC or SiOC ceramics is outlined.

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Silicon Carbide from Laser Pyrolysis of Polycarbosilane

Cited by 29 publications

References 16 publications

Silicon Carbide Films by Laser Pyrolysis of Polycarbosilane

Silicon Carbide Films by Laser Pyrolysis of Polycarbosilane

Comparison of Microwave Hybrid and Conventional Heating of Preceramic Polymers to Form Silicon Carbide and Silicon Oxycarbide Ceramics

Processing of polysiloxane-derived porous ceramics: a review

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