Near‐Stoichiometric Silicon Carbide from an Economical Polysilane Precursor

Seyferth, Dietmar; Wood, Timothy G.; Tracy, Henry J.; Robison, Jennifer L.

doi:10.1111/j.1151-2916.1992.tb05578.x

Cited by 50 publications

(25 citation statements)

References 8 publications

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“…Strict conservation of the monomer by cooling the reflux condenser to -20°C increases product yields to -60%. The solid, highly cross linked nature (60-70% cross linking) of the products (PMS L) is quite surprising in light of previous work [ 11,151. These yellow or gold solids have high ceramic yields, but have limited solubility in hexanes, THF and toluene compared to PMS N or PMS NX.…”

Section: Resultsmentioning

confidence: 87%

The Influence of Precursor Structure on the Development of Porosity in Polymer-Derived Sic

et al. 1996

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Polymer-based routes to ceramic oxides take advantage of precursor chemistry and structure to produce materials with a range of pore sizes. Polymer precursor routes to nonoxide ceramics offer products with superior thermal and chemical stability in many cases. Polymethylsilane (PMS), a versatile cross linked Sic precursor, [(MeHSi),(MeSi)y], was synthesized using published procedures to yield fluid precursors with a low (20-40%) degree of cross linking. Unique, highly cross linked (60-70%), solid polymers were produced under reaction conditions which carefully conserve the volatile monomer. These two polymers were converted to Sic to determine the relative importance of the various contributions to porosity, and to assess the role of precursor structure on porosity development in non-oxides. Initial results indicate that precursor structure has little effect on porosity. The development of the porosity appears to be dominated by high temperature thermochemistry and/or microstructural changes.

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Section: Resultsmentioning

confidence: 87%

The Influence of Precursor Structure on the Development of Porosity in Polymer-Derived Sic

et al. 1996

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“…Boron-containing catalysts have been actively studied as cross-linking agents for improving the ceramics yields [122][123][124]. Metallocene catalysts promote the dehydration of the Si H species at high pressure and thereby improve residual SiC yields [125,126]. The highly reactive nature of Si Cl bond in chlorine-containing polysilanes enables the cross-linking of polycarbosilanes to take place partly in the same temperature range where transformation of polysilanes to polycarbosilanes occurs [127].…”

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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“…52 73 To achieve increases in ceramic yield and carbon content, modification of PMS via Pt-catalyzed hydrosilylation with organic or organosilicon compounds has been conducted. 74 Other approaches to increasing the ceramic yield of PMS have utilized various catalysts, such as transition metals 75,76 and boron compounds.…”

Section: Precursors For Non-oxide Ceramicsmentioning

confidence: 99%

Pyrolytic Organic-to-Inorganic Conversion of Precursors into AlN-A Review

Mori¹,

Sugahara²

2006

J. Ceram. Soc. Japan

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ሱᑿ-ᠪᑿং၁ɟɵɃɁǺȗȚ AlN ǽΰ⓯ ἕ◻ ᎓ ؊͒ɿ≐‫ڤ‬ῲ˴ ᅤᨀগકᥴకકȤඅ᧸‫ك‬કᲇࢫ169-8555 ኇ̸ȩᄽٚগ˳Є 3-4-1 Pyrolyticéorganic-to-inorganicêconversion of precursors preceramic materials into aluminum nitride AlN has been investigated for the past few decades. AlN precursors can be classified based on their starting aluminum compounds organoaluminum compounds, inorganic compounds containing aluminum, and metallic aluminum. The preparation of various AlN precursors and their conversion mechanisms during pyrolysis are reviewed.

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Near‐Stoichiometric Silicon Carbide from an Economical Polysilane Precursor

Cited by 50 publications

References 8 publications

The Influence of Precursor Structure on the Development of Porosity in Polymer-Derived Sic

The Influence of Precursor Structure on the Development of Porosity in Polymer-Derived Sic

Processing of polysiloxane-derived porous ceramics: a review

Pyrolytic Organic-to-Inorganic Conversion of Precursors into AlN-A Review

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