A linear polycarbosilane containing <i>m</i>-carborane units: Synthesis and characterization as precursor for SiC/B<sub>4</sub>C ceramics

Zhou, Quan; Peng, Zhengqiang; Yang, Mingze; Hu, Hao; Song, Ning; Ni, Lizhong

doi:10.1177/0954008317746730

Cited by 6 publications

(2 citation statements)

References 29 publications

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“…In PIP, polycarbosilane (PCS) and polysilazane (PSZ) are often used as precursor to make SiC coating. However, it is hard for the polymer precursor to synthesize because of the complex process [24,25]. Sol-gel method is a much more practical and feasible way to fabricate three-dimensional (3D) composite coating.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Anti-Oxidation Ability of SiC-SiO2 Coated Carbon Fibers Using Sol-Gel Method

et al. 2018

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The paper proposed a method to improve the anti-oxidation performance of carbon fibers (CF) at high temperature environment by coating silicon dioxide (SiO2) and silicon carbide (SiC). The modified sol-gel method had been used to ensure the proper interface between fibers and coating. We used polydimethylsiloxane and ethyl orthosilicate to make stable emulsion to uniformly disperse SiC nanoparticles. The modified SiO2/SiC coating had been coated on CF successfully. Compared with the untreated CF, the coated fibers started to be oxidized around 900 °C and the residual weight was 57% at 1400 °C. The oxidation mechanism had been discussed. The structure of SiC/SiO2 coated CF had been characterized by scanning electron microscope and X-ray diffraction analysis. Thermal gravimetric analysis was used to test the anti-oxidation ability of CF with different coatings.

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Section: Introductionmentioning

confidence: 99%

Fabrication and Anti-Oxidation Ability of SiC-SiO2 Coated Carbon Fibers Using Sol-Gel Method

et al. 2018

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“…2,3 Additionally, the in-situ formation of oxide surface phases can limit the diffusion of oxygen into the bulk and thus reduce further degradation. 4 This attribute makes these materials attractive as environmental barrier coatings for polymer composites. Specifically, the diffusion-limited oxidation (DLO) conditions that these organic-inorganic polymer coatings can produce during operational performance can be exceptionally critical and useful for the long-term survivability of the underlying organic or graphitic composite.…”

Section: Introductionmentioning

confidence: 99%

The evaluation of an inorganic-organic poly(carborane-siloxane-arylacetylene) hybrid resin system

Monzel

Berglund

Kolel-Veetil

et al. 2022

High Performance Polymers

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The realization of aerospace vehicle technologies demanding extreme service conditions is facilitated by the development of materials with greater oxidative stability at high temperatures. Thermal performance of polymer composites can be increased by incorporating a hybrid (organic-inorganic) resin as a thermal barrier coating. One such resin system, meta-poly (carborane-siloxane-arylacetylene) ( m-PCSAA), developed by the U.S. Naval Research Laboratory, shows potential for such application and is further investigated in this work. The resin has a low viscosity (0.1 Pa s) with large processing window (2.5 h) from 100°C to 230°C. These processing characteristics are advantageous for infusion processes or the inclusion of fillers for coating applications. Curing was accomplished in two stages, corresponding to two exothermic reactions. After the first curing stage, the resin exhibits elastomeric behavior, and after the second curing stage is rigid with a high glass transition temperature (∼330°C). The materials exhibited high char yields (89%) in air at 1000°C and may be useful in space or for attritable technology. No cracks were observed during long-term service at 288°C, but significant degradation and cracking were observed after aging at 316°C. The materials exhibited high coefficients of thermal expansion; 186.9 and 168.6 μm/(m∙°C) after first and second curing stage respectively. Similar to epoxies and polyimides, the resin acquired up to 3% moisture at 70°C and 85% relative humidity.

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Polymer‐Derived High‐Temperature Nonoxide Materials: A Review

Zhou

2023

Adv Eng Mater

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The synthesis of polymer-derived nonoxide materials such as carbides, borides, and nitrides started in the 1970s and slowly progressed into the 1980s, with silicon carbide (SiC) fibers as the prime examples. [1] In the 1990s, the research activities in this area became more intensive, with multiple efforts devoted to understanding the polymer-to-ceramic conversion mechanisms, resulting microstructures, and mechanical properties. In the 2000s, relying on the liquid precursor nature and advancement in chemistry, new techniques (e.g., electrospinning, coating, and precursor infiltration) and new precursors were introduced. Understanding of the crosslinking and thermal conversion process was improved. For example, SiC fibers were improved from amorphous silicon oxycarbide (SiOC) to low-oxygen SiC fibers and then to near-stoichiometric SiC fibers. SiC thin films of 8-190 μm thickness were reported in 2009. [2] These films can stand alone, and high mechanical properties and optoelectronic properties were achieved. Because of these advantages, they were proposed to be used in microelectromechanical systems (MEMS) and optoelectronic devices. In recent decades, additive manufacturing was used to form complex shapes. [3] Also, different one-pot precursor synthesis approaches were reported. [4] The pyrolyzed ceramic systems were frequently used in a powder format and can be further processed with traditional forming processes such as spark plasma sintering, hot pressing, thermal treatment, etc. [5,6] The advantages of using the polymerderived approach for such high-temperature nonoxide material formations involve several aspects. Compositions can be designed based on molecular-level interactions and conversion of polymeric precursors to composites. Through a synergistic selection and combination of polymer molecules of different architectures and additives, a large family of functional, structural, resilient, and versatile materials can be created. Pyrolysis conditions can also be varied to create different property systems. Species intermixing can be achieved at the true atomic level. It enables functional properties for inert systems and harsh environmental stability for far-from-equilibrium conditions. Additional advantages include low processing temperature (such as a few hundred degrees Celsius lower) and versatile shape achievement. The final materials can be fibers, coatings, membranes, powders, bulk parts, porous forms, infiltrating phases, and complex 3D-printed shapes, [3a] among others. Using the polymer-derived approach to form high-temperature ceramics also enables composition homogeneity and purity, thanks to the uniform mixing of different precursors and additives and high-purity chemical precursors. It can also create compositions that may be impossible with conventional routes, [7] such as sintering.The common challenges are as follows. Polymer-derived nonoxide composites are in a metastable state. At high temperatures, the composition and microstructure can continue to evolve and

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A linear polycarbosilane containing m-carborane units: Synthesis and characterization as precursor for SiC/B₄C ceramics

Cited by 6 publications

References 29 publications

Fabrication and Anti-Oxidation Ability of SiC-SiO2 Coated Carbon Fibers Using Sol-Gel Method

Fabrication and Anti-Oxidation Ability of SiC-SiO2 Coated Carbon Fibers Using Sol-Gel Method

The evaluation of an inorganic-organic poly(carborane-siloxane-arylacetylene) hybrid resin system

Polymer‐Derived High‐Temperature Nonoxide Materials: A Review

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A linear polycarbosilane containing m-carborane units: Synthesis and characterization as precursor for SiC/B4C ceramics

Cited by 6 publications

References 29 publications

Fabrication and Anti-Oxidation Ability of SiC-SiO2 Coated Carbon Fibers Using Sol-Gel Method

Fabrication and Anti-Oxidation Ability of SiC-SiO2 Coated Carbon Fibers Using Sol-Gel Method

The evaluation of an inorganic-organic poly(carborane-siloxane-arylacetylene) hybrid resin system

Polymer‐Derived High‐Temperature Nonoxide Materials: A Review

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A linear polycarbosilane containing m-carborane units: Synthesis and characterization as precursor for SiC/B₄C ceramics