The fate and role of in situ formed carbon in polymer-derived ceramics

Wen, Qingbo; Yu, Zhaoju; Riedel, Ralf

doi:10.1016/j.pmatsci.2019.100623

Cited by 302 publications

(254 citation statements)

References 644 publications

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“…As a representative PDCs, the polymer derived silicon carbonitride (SiCN) ceramic is composed of the amorphous SiC x N y phase and the free-carbon phase [1,14]. The SiC x N y phase supports most of the load in indentation, while the free carbon supports the load in elastic deformation stage [15,16]. The special heterogeneous microstructure makes the uniform removal extremely di cult, thus leading to the di culty in acquiring ultra-smooth surface.…”

Section: Introductionmentioning

confidence: 99%

“…For glass and silicon nitride (Si 3 N 4 ) ceramic workpieces, CMP has been successfully applied by using water solution, under polishing environment with pH 7-9, and abrasive with a hardness of approximately 7 Mohs (such as zirconia (ZrO 2 ) and ceria) [18]. In SiCN ceramics, the SiC x N y ceramics phase seems to present a primary contribution to mechanical property on the whole [15,19]. Therefore, similar polishing slurry was used to assess the underlying CMP mechanisms for polishing SiCN-based PDCs.…”

Section: Introductionmentioning

confidence: 99%

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WITHDRAWN: Ultra-Precision Polishing Method of Polymer-Derived Amorphous SiAlCN Ceramics

Chen

Cao

Wang

2020

Preprint

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The amorphous and heterogeneous microstructures of polymer-derived ceramics (PDCs) make it challenging to uniformly polish them without the appearance of obvious polishing defects. In this study, the surface characteristics of polymer-derived silicoaluminum carbonitride (SiAlCN) ceramics were investigated after mechanical polishing and chemical–mechanical polishing (CMP). The results showed the generation of polishing defects including scratches, pits, and comet tails after mechanical polishing; nonetheless, the surface quality was largely improved after CMP, providing an ultra-smooth surface (Ra = ~0.25 nm). The evolution of the surface morphology was characterized in detail and X-ray photoelectron spectroscopy was used to analyze the characteristics of chemical bond before and after the CMP. The polishing slurry dominated the corrosion process during CMP, inducing the oxidation of the SiCxNy phase; nonetheless, the so-formed oxidation products and carbon phase were removed by mechanical action. The obtained ultra-high smooth surface can promote practical application in the field of PDCs-based sensors.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Ultra-Precision Polishing Method of Polymer-Derived Amorphous SiAlCN Ceramics

Chen

Cao

Wang

2020

Preprint

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“…The higher the I D / I G value, the higher the disorder of free carbon. [ 27 ] As the carbon content in the precursor increased, the I D / I G value was observed to decrease from 4.15 to 2.05, indicating that the structural defects in BCN ceramics were reduced and the structural disorder of free carbon was decreased. Among them, the I D / I G value of BCN‐3 was the lowest, which was attributed to the presence of most carbon atoms in the sp 2 hybridization state, and it was easier to form a complete graphite sheet structure.…”

Section: Resultsmentioning

confidence: 99%

BCN ceramics with excellent electromagnetic wave–absorbing property derived from high‐yield and soluble precursor polymers

Zhang

Long

et al. 2020

Applied Organom Chemis

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Polymer‐derived ceramics have been used as functional nanocomposites with designable structures and tunable properties. In this report, three types of BCN ceramics were fabricated from boron‐modified precursors, which were in turn synthesized by the polymerization of decaborane as boron‐rich monomer with diamines as linkages. All of these precursors present high ceramic yield and good solubility in N,N‐dimethylformamide and dimethyl sulfoxide. The composition and structure of precursors were characterized using elemental analysis, Fourier‐transform infrared, gel permeation chromatography, and nuclear magnetic resonance. The structural evolution during the polymer‐to‐ceramic process and the microstructure of pyrolyzed BCN ceramics were analyzed in detail. The BCN ceramic with 16 wt. % carbon content derived from alkyldiamines exhibited promising X‐band absorption properties. When the sample thickness is only 1.8 mm, the minimum reflection loss reaches −40.9 dB at 15.8 GHz with an effective absorption bandwidth of 5.3 GHz. The simple and processable method for BCN ceramics was developed to satisfy the demand of materials with adjustable electromagnetic wave absorption properties.

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“…However, to date there are still very few reports concerning SiOC-graphite composites and, to the best of our knowledge, no reports concerning the utilization of SiOC/graphite composite for LIC. The main advantage of SiOCs over SiCNs is the higher resistance of the preceramic polymer against oxidation, which facilitates material production [ 45 , 46 ].…”

Section: Introductionmentioning

confidence: 99%

Silicon Oxycarbide-Graphite Electrodes for High-Power Energy Storage Devices

et al. 2020

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Herein we present a study on polymer-derived silicon oxycarbide (SiOC)/graphite composites for a potential application as an electrode in high power energy storage devices, such as Lithium-Ion Capacitor (LIC). The composites were processed using high power ultrasound-assisted sol-gel synthesis followed by pyrolysis. The intensive sonication enhances gelation and drying process, improving the homogenous distribution of the graphitic flakes in the preceramic blends. The physicochemical investigation of SiOC/graphite composites using X-ray diffraction, 29Si solid state NMR and Raman spectroscopy indicated no reaction occurring between the components. The electrochemical measurements revealed enhanced capacity (by up to 63%) at high current rates (1.86 A g−1) recorded for SiOC/graphite composite compared to the pure components. Moreover, the addition of graphite to the SiOC matrix decreased the value of delithiation potential, which is a desirable feature for anodes in LIC.

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The fate and role of in situ formed carbon in polymer-derived ceramics

Cited by 302 publications

References 644 publications

WITHDRAWN: Ultra-Precision Polishing Method of Polymer-Derived Amorphous SiAlCN Ceramics

WITHDRAWN: Ultra-Precision Polishing Method of Polymer-Derived Amorphous SiAlCN Ceramics

BCN ceramics with excellent electromagnetic wave–absorbing property derived from high‐yield and soluble precursor polymers

Silicon Oxycarbide-Graphite Electrodes for High-Power Energy Storage Devices

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The fate and role of in situ formed carbon in polymer-derived ceramics

Cited by 302 publications

References 644 publications

WITHDRAWN: Ultra-Precision Polishing&nbsp;Method&nbsp;of&nbsp;Polymer-Derived&nbsp;Amorphous SiAlCN Ceramics

WITHDRAWN: Ultra-Precision Polishing&nbsp;Method&nbsp;of&nbsp;Polymer-Derived&nbsp;Amorphous SiAlCN Ceramics

BCN ceramics with excellent electromagnetic wave–absorbing property derived from high‐yield and soluble precursor polymers

Silicon Oxycarbide-Graphite Electrodes for High-Power Energy Storage Devices

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Product

Resources

About

WITHDRAWN: Ultra-Precision Polishing Method of Polymer-Derived Amorphous SiAlCN Ceramics

WITHDRAWN: Ultra-Precision Polishing Method of Polymer-Derived Amorphous SiAlCN Ceramics