High Yield Polycarbosilane Precursors to Stoichiometric SiC.
                        Synthesis, Pyrolysis and Application

Interrante, L. V.; Whitmarsh, C.W.; Sherwood, Walter; Wu, H.-J.; Lewis, R.; Maciel, Gary E.

doi:10.1557/proc-346-595

Cited by 59 publications

(69 citation statements)

References 14 publications

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“…Figure 35 shows the IR spectra obtained for products at different temperatures; data is offset to aid comparison. Peaks attributed to C-H (stretching), Si-H (stretching) and Si-C (rocking) bonds were clearly observed in the ranges of 2800-3000 cm −1 , 2000-2140 cm −1 and 870-1070 cm −1 [59,146,147], respectively.…”

Section: Physical and Analytical Characterizationmentioning

confidence: 98%

“…It offers direct control of the microstructure and composition; allows for incorporation of fibrous and particulate reinforcements; and, perhaps most importantly, offers the possibility of net shape manufacturing at temperatures as low as 500-1500 • C [57][58][59]. In this manner, the PIP process can be used for consolidation of several compatible species due to its adaptability.…”

Section: Sic Fabrication Using Polymer Infiltration and Pyrolysismentioning

confidence: 99%

“…Polymer infiltration and pyrolysis has been identified as a viable alternative for fabricating SiC based materials [31,[57][58][59][62][63][64][65]. However, the use of PIP for fabricating materials targeted for nuclear applications is limited.…”

Section: Sic Fabrication Using Polymer Infiltration and Pyrolysismentioning

confidence: 99%

“…And, of the several available SiC polymer precursors, allylhydridopolycarbosilane (AHPCS) is the polymer of our choice. It is an ultra high purity precursor that yields a near stoichiometric ratio on complete pyrolysis [59]. Its high ceramic yield, relatively low shrinkage and ability to be handled and processed in ambient conditions have attracted wide attention, especially as precursor to SiC fibers and more recently as matrix material [48,58,134,135].…”

Section: Prior Studies On Ahpcs-derived Silicon Carbidementioning

confidence: 99%

“…Thus it has a Si:C ratio that is close to 1:1 and yields a near stoichiometric SiC upon pyrolysis. AHPCS is commercially available through Starfire Systems Co. (Malta, New York, USA) and is being researched as a binder for ceramic powders and matrix source for polymer-derived ceramic matrix composites [58,59,134]. It has also been used to produce SiC coatings and join monolithic and composite ceramic parts [62,140].…”

Section: Prior Studies On Ahpcs-derived Silicon Carbidementioning

confidence: 99%

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Novel Processing of Unique Ceramic-Based Nuclear Materials and Fuels

Zhang¹,

Singh²

2008

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Advances in nuclear reactor technology and the use of gas-cooled fast reactors require the development of new materials that can operate at the higher temperatures expected in these systems. These include refractory alloys based on Nb, Zr, Ta, Mo, W, and Re; ceramics and composites such as those based on silicon carbide (SiC f -SiC); carbon-carbon composites; and advanced coatings. Besides the ability to handle higher expected temperatures, effective heat transfer between reactor components is necessary for improved efficiency. Improving thermal conductivity of the materials used in nuclear fuels and other temperature critical components can lower the center-line fuel temperature and thereby enhance durability and reduce the risk of premature failure.Silicon carbide (SiC) is an important ceramic, most commonly used because of its excellent properties such as high strength, high modulus, excellent creep resistance and its high temperature stability. Moreover, crystalline silicon carbide is attracting wide attention as a promising candidate for several applications in nuclear reactors owing to its high thermal conductivity, high melting temperature, good chemical stability, and resistance to swelling under heavy ion bombardment. There have been many efforts to develop SiC based composites in various forms for use in advanced energy systems. However, fabricating SiC based composites by traditional powder processing route generally requires very high temperatures for pressureless sintering. In recent years, with the development of high yield preceramic precursors, the polymer infiltration and pyrolysis (PIP) method has aroused interest for the fabrication of ceramic based materials. Polymer derived ceramic materials offer unique advantages such as ability to fabricate net shaped components, incorporate reinforcements, along with lower processing temperatures, and perhaps most importantly relatively easy control over the microstructure. The raw materials are element-organic polymers whose composition and architecture can be tailored and varied.The primary focus of this work is to use a pyrolysis-based process to fabricate a host of novel silicon carbide-metal carbide/oxide composites, and to synthesize new materials based on mixed-metal (metal/silicon) carbides that cannot be processed using conventional techniques. These mixedcarbide material systems are expected to offer improved material properties for higher-temperature applications. Our fabrication technique resulted in both amorphous and nano-grained SiC matrix composites by controlled pyrolysis of allylhydridopolycarbosilane (AHPCS), the precursor for SiC for our study, under inert argon atmosphere.Cylindrical pellets, φ25 × 25 mm, were fabricated for bulk scale characterization. These samples were analyzed in terms of density and porosity, thermal conductivity, and flexural strength under multiaxial loading conditions. The final composition in the fabricated composite was studied use Xray diffraction (XRD). This was useful in understanding the relative stabil...

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Section: Physical and Analytical Characterizationmentioning

confidence: 98%

Section: Sic Fabrication Using Polymer Infiltration and Pyrolysismentioning

confidence: 99%