Polymer derived silicon oxycarbide-based coatings

Lu, Kathy; Erb, Donald

doi:10.1080/09506608.2017.1322247

Cited by 65 publications

(31 citation statements)

References 107 publications

(203 reference statements)

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“…In addition to these polymer‐related processing techniques, non‐polymer precursor techniques were also employed, such as the radio frequency magnetron sputtering (RF magnetron sputtering), ultra‐high vacuum RF magnetron sputtering (UHV RF magnetron sputtering) and reactive laser evaporation methods. A review on SiOC‐based coatings was published recently . Depending on the technique used, suitable visco‐elastic properties for the deposition of the polymeric films can be obtained upon mixing appropriate amounts of solvents with the preceramic polymers.…”

Section: Processing Of Silicon Oxycarbidesmentioning

confidence: 99%

Silicon oxycarbide glasses and glass‐ceramics: “All‐Rounder” materials for advanced structural and functional applications

et al. 2018

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Silicon oxycarbides can be considered as being carbon‐containing silicates consisting of glass networks in which oxygen and carbon share bonds with silicon. The carbon‐for‐oxygen substitution in silicate glass networks has been shown to induce significant changes in the network connectivity and consequently strong improvements in the properties of the silicate glass network. For instance, SiOC glasses exhibit Young's moduli, hardness values, glass transition, and crystallization temperatures which are superior to those of vitreous silica. Moreover, the silicon oxycarbide glass network exhibits unique structural features such as reduced mass fractal dimension and nano‐heterogeneity, which significantly affect and/or dictate its properties and behavior. In the present Review, a consideration of the current state of the art concerning the synthesis, processing, and various structural and functional properties of silicon‐oxycarbide‐based glasses and glass‐ceramics is done. Thus, the synthesis of silicon oxycarbides starting from macromolecular precursors such as polysiloxanes or alkoxysilanes‐based sol‐gel systems as well as current advances related to their processing will be critically reviewed. In addition, various structural and functional properties of silicon oxycarbides are presented. Specific emphasis will be put on the intimate correlation between the molecular architecture of the precursors and the structural features and properties of the resulting silicon oxycarbides.

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Section: Processing Of Silicon Oxycarbidesmentioning

confidence: 99%

Silicon oxycarbide glasses and glass‐ceramics: “All‐Rounder” materials for advanced structural and functional applications

et al. 2018

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“…Polymer‐derived ceramic nanocomposites (PDC‐NCs) have drawn much attention in recent decades . Typically, silicon oxycarbide (SiOC) ceramics, which are known as “all‐rounder” materials, possess outstanding properties such as high creep resistance and bioactivity, excellent thermal stability, adjustable electrical conductivity, piezoresistive response, advanced Li‐ion‐storage capacity, and others . SiOC ceramics can be considered as a vitreous silica network comprised of bivalent oxygen being partly replaced by tetravalent carbon.…”

Section: Introductionmentioning

confidence: 99%

Phase evolution of SiOC‐based ceramic nanocomposites derived from a polymethylsiloxane modified by Hf‐ and Ti‐alkoxides

Sun

Wen

et al. 2019

J Am Ceram Soc

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SiOC/HfO2‐based ceramic nanocomposites with in situ formed HfO2 nanoparticles were prepared via a single‐source precursor (SSP) approach starting from a polymethylsilsesquioxane (PMS) modified by Hf‐ and Ti‐alkoxides. By varying the alkyl‐group of the employed Hf‐alkoxides, SiOC/HfO2‐based ceramic nanocomposites with different HfO2 polymorphs formed via thermal decomposition of the SSP under the same heat‐treatment conditions. Using PMS chemically modified by Hf(OnBu)4, tetragonal HfO2 phase was formed after the synthesis at 1100°C in Ar, whereas both, tetragonal and monoclinic HfO2 nanocrystals, were analyzed when replacing Hf(OnBu)4 by Hf(OiPr)4. After oxidation of the synthesized nanocomposites in air at 1500°C, a facile formation of oxidation‐resistant HfSiO4 (hafnon) phase occurred by the reaction of HfO2 nanocrystals with silica present in the SiOC nanocomposite matrix derived from Hf(OiPr)4‐modified SSPs. Moreover the amount of hafnon is dramatically increased by the additional modification of the polysiloxane with Ti‐alkoxides. In contrast, ceramic nanocomposites derived from Hf(OnBu)4‐modified SSPs, almost no HfSiO4 is detected after oxidation at 1500°C even though in the case of Ti‐alkoxide‐modified single‐source precursor.

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“…Silicon oxycarbides (SiOCs) are promising materials for high temperature application due to their high stability in harsh environments. They are mainly synthesized via the pyrolysis of preceramic polymeric precursors such as polyorganosiloxanes or precursors that are derived from sol‐gel synthesis of alkoxysilanes .…”

Section: Introductionmentioning

confidence: 99%

Influence of SiC/Silica and Carbon/Silica Interfaces on the High‐Temperature Creep of Silicon Oxycarbide‐Based Glass Ceramics: A Case Study

et al. 2018

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In the present study, the high-temperature creep behavior of three SiOC glass ceramics with different phase compositions are compared by the authors. All three SiOC glass ceramics have a vitreous silica matrix in common, but comprise different homogeneously dispersed phases: 1) only spherical β-SiC nanoparticles (sample denoted hereafter SiC/SiO 2 ), 2) only high-aspect ratio sp 2 -hybridized carbon (i.e., C/SiO 2 ), and 3) both phases (SiC and segregated carbon, i.e., C/SiC/SiO 2 ). Compression creep experiments are performed at temperatures in the range between 1100 and 1300 C and true stresses of 50 to 200 MPa. The determined activation energy for creep of the SiOC glass ceramics of around 700 kJ mol À1 is independent of the phase composition. A stress exponent value of approximately 2 indicates an interface-controlled deformation mechanism. All SiOC glass ceramics exhibit significantly higher creep viscosities than that of vitreous silica. Surprisingly, the spherical β-SiC nanoparticles have a higher impact on the effective creep viscosities of SiOC as compared to that of the high-aspect ratio segregated carbon phase. It is concluded that this originates from the β-SiC/silica and C/silica interfaces, which have different effects on the creep behavior of silicon oxycarbide-based glass ceramics.

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Polymer derived silicon oxycarbide-based coatings

Cited by 65 publications

References 107 publications

Silicon oxycarbide glasses and glass‐ceramics: “All‐Rounder” materials for advanced structural and functional applications

Silicon oxycarbide glasses and glass‐ceramics: “All‐Rounder” materials for advanced structural and functional applications

Phase evolution of SiOC‐based ceramic nanocomposites derived from a polymethylsiloxane modified by Hf‐ and Ti‐alkoxides

Influence of SiC/Silica and Carbon/Silica Interfaces on the High‐Temperature Creep of Silicon Oxycarbide‐Based Glass Ceramics: A Case Study

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