Microstructure evolution of precursors-derived SiCN ceramics upon thermal treatment between 1000 and 1400°C

Gregori, Giuliano; Kleebe, Hans‐Joachim; Brequel, H.; Enzo, Stefano; Ziegler, G.

doi:10.1016/j.jnoncrysol.2005.03.025

Cited by 54 publications

(48 citation statements)

References 37 publications

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“…61 In the Raman spectrum of the residue, two bands are observed at 1337 and 1595 cm −1 , which are consistent with the Raman spectrum of amorphous carbon. 62,63 The XRD pattern of the pyrolyzed residue is shown in Fig. 7.…”

Section: Characterizations Of the Residue Pyrolyzed At 1700mentioning

confidence: 99%

Pyrolytic conversion of an AlSiNC precursor prepared via hydrosilylation between [Me(H)SiNH]4 and [HAlN(allyl)]m[HAlN(ethyl)]n

Mori¹,

Sugahara²

2006

Appl. Organometal. Chem.

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Section: Characterizations Of the Residue Pyrolyzed At 1700mentioning

confidence: 99%

Pyrolytic conversion of an AlSiNC precursor prepared via hydrosilylation between [Me(H)SiNH]4 and [HAlN(allyl)]m[HAlN(ethyl)]n

Mori¹,

Sugahara²

2006

Appl. Organometal. Chem.

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“…The Si-N and C-C bonds dominate all the structures, with the existence of very small amount of Si-C bonds. According to neutron scattering results (Gregori et al, 2005), Si-atoms are bonded to N-atoms while the signal corresponding to the Si-C atomic pair distance is not clearly observed. However, the electron energy-loss spectroscopy (EELS) data of the Si-L ionisation edge indicates the presence of both Si-N and Si-C bonding (Gregori et al, 2005), therefore, a fraction of C-atoms is incorporated into the Si-based network.…”

Section: Resultsmentioning

confidence: 92%

“…According to neutron scattering results (Gregori et al, 2005), Si-atoms are bonded to N-atoms while the signal corresponding to the Si-C atomic pair distance is not clearly observed. However, the electron energy-loss spectroscopy (EELS) data of the Si-L ionisation edge indicates the presence of both Si-N and Si-C bonding (Gregori et al, 2005), therefore, a fraction of C-atoms is incorporated into the Si-based network. It suggests the formation of a microstructure where amorphous carbon together with a few amorphous Si-C regions is interconnected in between an amorphous Si 3 N 4 phase.…”

Section: Resultsmentioning

confidence: 92%

Predicting structural properties of amorphous silicon carbonitride by atomistic simulation

Liao

Zhang

Raj

et al. 2016

IJMSI

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Silicon carbonitride (SiCN) has superior mechanical properties at high temperature, but its structural properties in molecular scale are not clear. In this study, atomistic simulations were applied to study the molecular structure of amorphous SiCN. The atomistic structures obtained by large-scale molecular dynamics simulations agree with current experimental results, and moreover, provide more details on molecular structure. The Si-C bonds generally keep stable proportion for all the three cases, which means the additional carbon tends to form free carbon network rather than Si-C bonds. Si-CN 3 is dominant inSi-C/N tetrahedron, and as expected the increase of C content in SiCN tends to form more Si-C 2 N 2 and Si-C 3 N tetrahedra.

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“…33 The Raman spectrum of the residue exhibits two bands at 1337 and 1595 cm À1 , which are attributable to amorphous carbon. 34,35 Figure 8 shows the XRD pattern of the pyrolyzed residue. The XRD pattern of the residue is consistent with that of crystalline AlN, 36 and no reflection due to crystalline BN phase is observed.…”

Section: Resultsmentioning

confidence: 99%

One-Pot Synthesis of Soluble Precursors Possessing Both Al–N and B–N Backbones and Their Pyrolysis

Mori¹,

Sugahara²

2006

Bulletin of the Chemical Society of Japan

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Soluble precursors possessing both Al-N and B-N backbones have been prepared from LiAlH 4 , LiBH 4 , and RNH 2Á HCl (R = Me and Et) in one pot. The infrared (IR) and nuclear magnetic resonance (NMR) spectra of the precursors indicate that the precursors possess Al-H and B-H groups as well as Al-N, B-N, Al-(-H) 2 -Al, and Al-(-H) 2 -B bonds. TG analysis reveals that the ceramic yield of the precursor [AB11 Me (LiAlH 4 /LiBH 4 /MeNH 2Á HCl = 1/1/2)] up to 1000 C under an argon atmosphere is 74.4 mass %. The transmission electron microscopic (TEM) images and the X-ray diffraction (XRD) pattern of AB11 Me that was pyrolyzed at 1600 C indicate that the average size of crystalline aluminum nitride (AlN) is about 14 nm and that crystalline AlN particles are distributed homogeneously in an amorphous matrix.Pyrolytic conversion of precursors, so-called preceramic materials, is a chemical route to obtaining non-oxide ceramics and ceramic-based composites. [1][2][3][4] Using this approach, highpurity materials with a homogeneous distribution of component elements on an atomic scale and a controllable microstructure can be obtained at relatively low temperatures. When preceramic materials are fusible at relatively low temperatures or soluble in common organic solvents, this process can also offer fabrication routes to desirable shapes, including coatings and fibers, which are essentially unattainable by a conventional powder process. 4 Aluminum nitride (AlN)-boron nitride (BN) composites possess many attractive properties, including high thermal conductivity and high electrical insulation as well as excellent machinability and lubricativity.5-10 These properties suit them various applications, 5,7 such as electromagnetic window materials, heat sinks, and protective coatings of communication and detection equipment on aircraft. AlN-BN composites are generally prepared by a conventional powder process.11-15 The powder process generally results in substantial anisotropy in their microstructures, however, and, consequently, in their various properties. 11Recently, a few studies have reported the preparation of AlN-BN ceramic-based composites by pyrolytic conversion of precursors. In an approach using metalorganic compounds, the precursors were synthesized by the reaction between (Et 2 AlNH 2 ) 3 and B(NEt) 3 to form homogeneous composites composed of crystalline AlN and turbostatic-BN by pyrolysis. 5In another approach, gels for AlN-BN composites were prepared by the ammonolysis of H 3 BO 3 , AlCl 3 , and (NH 2 ) 2 CO in aqueous solutions. 16 As a one-pot synthesis approach, Dou et al. prepared precursors by reacting metal hydrides (H 3 Al Á NMe 3 and H 3 B Á NH 3 ) with ammonia.17 Although homogeneously dispersed AlN-BN composites were considered to be obtained by this approach, all of these precursors were insoluble in common organic solvents.Here, we report a one-pot synthesis of soluble precursors by the reactions involving lithium tetrahydridoaluminate (LiAlH 4 ), lithium tetrahydroborate (LiBH 4 ), and alkylamine hydrochl...

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Microstructure evolution of precursors-derived SiCN ceramics upon thermal treatment between 1000 and 1400°C

Cited by 54 publications

References 37 publications

Pyrolytic conversion of an AlSiNC precursor prepared via hydrosilylation between [Me(H)SiNH]4 and [HAlN(allyl)]m[HAlN(ethyl)]n

Pyrolytic conversion of an AlSiNC precursor prepared via hydrosilylation between [Me(H)SiNH]4 and [HAlN(allyl)]m[HAlN(ethyl)]n

Predicting structural properties of amorphous silicon carbonitride by atomistic simulation

One-Pot Synthesis of Soluble Precursors Possessing Both Al–N and B–N Backbones and Their Pyrolysis

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