Polymer derived SiBCN(O) ceramics with tunable element content

Wang, Bijie; Song, Yujie; Zhang, Xiao; Chen, Ke; Liu, Ming; Hu, Xiao; He, Liu; Huang, Qing

doi:10.1016/j.ceramint.2021.12.246

Cited by 14 publications

(6 citation statements)

References 41 publications

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“…[ 62 ] In another study, amorphous SiBCN(O) ceramics were made from pyrolysis of crosslinked polyborosilazanes. [ 63 ] SiC/B 4 C composite was made from poly(carborane)(silicon‐acetylene) after 1600 °C thermal treatment. [ 64 ] The formed SiC/B 4 C phases were highly crystalline with sizes at <100 nm.…”

Section: Carbide Materialsmentioning

confidence: 99%

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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Section: Carbide Materialsmentioning

confidence: 99%

Polymer‐Derived High‐Temperature Nonoxide Materials: A Review

Zhou

2023

Adv Eng Mater

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“…The tunable structures and compositions of preceramic polymers enable the fabrication of complex ceramics, such as SiO(N)C, 45 SiHfC, 46,47 SiTaC, 48 SiBCO, 49 SiAlCO, [50][51][52] SiAlCN, [53][54][55] SiBCN, [56][57][58][59] SiHf TaC, 60 SiHfCNO, 61,62 SiHfBCN, [63][64][65] SiZrBCN, 66 which cannot be obtained easily by traditional ceramic processing strategies. As mentioned earlier, preceramic polymers can be formed by conventional polymer-forming techniques.…”

Section: Preparation Of Pdcsmentioning

confidence: 99%

“…Among these, the synthesis of preceramic polymers is considered to be the key process, because the chemical and phase compositions as well as the microstructures of PDCs are highly dependent on the molecular structure of the preceramic polymer. The tunable structures and compositions of preceramic polymers enable the fabrication of complex ceramics, such as SiO(N)C, 45 SiHfC, 46,47 SiTaC, 48 SiBCO, 49 SiAlCO, 50–52 SiAlCN, 53–55 SiBCN, 56–59 SiHfTaC, 60 SiHfCNO, 61,62 SiHfBCN, 63–65 SiZrBCN, 66 which cannot be obtained easily by traditional ceramic processing strategies. As mentioned earlier, preceramic polymers can be formed by conventional polymer‐forming techniques.…”

Section: Polymer‐derived Ceramics (Pdcs)mentioning

confidence: 99%

Polymer‐derived ceramics for electrocatalytic energy conversion reactions

Guo

Sugahara

2022

Int J Applied Ceramic Tech

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Polymer-derived ceramics (PDCs) are being actively explored in various fields today because of their unique physiochemical properties. Very recent advances in the use of PDCs in energy storage technologies (e.g., batteries, supercapacitors) have motivated researchers to explore the possibilities of PDCs as electrocatalysts for use in energy conversion reactions. Impressively, the tunable functional properties, especially the electrical properties, of PDCs have helped to break through this "bottleneck" and enabled them to become promising materials for use in electrocatalytic conversion. This review presents an in-time summary of the progress in the development of PDCs for electrochemical energy conversion. First, a general introduction to the preparation of PDCs is provided. Later, the factors (e.g., chemical stability, electron conductivity) most closely related to electrocatalytic performance are discussed. Specifically, the parameters that affect the electron conductivity of PDCs are enumerated to delve into advanced strategies for achieving effective electrocatalysts. The relevant electrocatalytic conversion reactions (e.g., hydrogen evolution reaction, oxygen evolution reaction, and oxygen reduction reaction) and utilization of PDCs in these reactions are also comprehensively introduced. Finally, the current challenges and future opportunities for PDC materials in the field of electrochemical energy conversion are summarized.

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“…[13][14][15] Such techniques may not permit swift tunability of the microstructure and dimensions of the ceramics, thus deeming the synthesis process inefficient. [16][17][18][19] Other common approaches for synthesis of binary SiC and ternary SiOC systems include chemical vapor deposition and spark plasma sintering. The former is typically preferred for the production of thin films in the semiconductor industry.…”

Section: Introductionmentioning

confidence: 99%

“…By convention, ceramic systems are produced by high temperature sintering of powder mixtures 13–15 . Such techniques may not permit swift tunability of the microstructure and dimensions of the ceramics, thus deeming the synthesis process inefficient 16–19 . Other common approaches for synthesis of binary SiC and ternary SiOC systems include chemical vapor deposition and spark plasma sintering.…”

Section: Introductionmentioning

confidence: 99%

Energetics and structure of SiC(N)(O) polymer‐derived ceramics

et al. 2023

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This study presents new experimental data on the thermodynamic stability of SiC(O) and SCN(O) ceramics derived from the pyrolysis of polymeric precursors: SMP‐10 (polycarbosilane), PSZ‐20 (polysilazane), and Durazane‐1800 (polysilazane) at 1200°C. There are close similarities in the structure of the polysilazanes, but they differ in crosslinking temperature. High‐resolution X‐ray photoelectron spectroscopy shows notable differences in the microstructure of all polymer‐derived ceramics (PDCs). The enthalpies of formation (∆H°f, elem) of SiC(O) (from SMP‐10), SCN(O) (from PSZ‐20), and SCN(O) (from Durazane‐1800) are −20 ± 4.63, −78.55 ± 2.32, and −85.09 ± 2.18 kJ/mol, respectively. The PDC derived from Durazane‐1800 displays greatest thermodynamic stability. The results point to increased thermodynamic stabilization with addition of nitrogen to the microstructure of PDCs. Thermodynamic analysis suggests increased thermodynamic drive for forming SiCN(O) microstructures with an increase in the relative amount of SiNxC4−x mixed bonds and a decrease in silica. Overall, enthalpies of formation suggest superior stabilizing effect of SiNxC4−x compared to SiOxC4−x mixed bonds. The results indicate systematic stabilization of SiCN(O) structures with decrease in silicon and oxygen content. The destabilization of PDCs resulting from higher silicon content may reach a plateau at higher concentrations.

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Polymer derived SiBCN(O) ceramics with tunable element content

Cited by 14 publications

References 41 publications

Polymer‐Derived High‐Temperature Nonoxide Materials: A Review

Polymer‐Derived High‐Temperature Nonoxide Materials: A Review

Polymer‐derived ceramics for electrocatalytic energy conversion reactions

Energetics and structure of SiC(N)(O) polymer‐derived ceramics

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