Phase, nanostructure, and oxidation of precursor derived SiCN–TiO2 ceramic nanocomposites

Anand, Rahul; Nayak, Bibhuti B.; Behera, Shantanu K.

doi:10.1016/j.ceramint.2021.06.210

Cited by 15 publications

(7 citation statements)

References 91 publications

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“…The dimensions of the ceramic microstructures can be varied using polydimethylsiloxane molds with different size patterns. [ 48 ] Oxygen‐containing species can be introduced to form more complex SiCN composites, [ 121 ] at the expense of oxygen impurity.…”

Section: Silicon Nitride 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: Silicon Nitride Materialsmentioning

confidence: 99%

Polymer‐Derived High‐Temperature Nonoxide Materials: A Review

Zhou

2023

Adv Eng Mater

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“…15,34 This additional loss can be attributed to the mass loss caused by condensation and decomposition of C 12 H 28 HfO 4 ⋅C 3 H 8 O. Indeed, the theoretical yield of hafnium precursor and PVS is considered to be 44.32% and 82.90%, 18 respectively, at 1400 • C. Therefore, with the cationic ratio (Hf:Si) of 0.2 in the precursor mixture, a ceramic yield of 72% is estimated, which is in good agreement with the actual value. The overall ceramic yield of the PVS-Hf precursor remains at ∼76.6 wt%, which is 6.2 wt% lower than that of the pure PVS precursor.…”

Section: Polymer-to-ceramic Transformationmentioning

confidence: 99%

“…Current investigation is an attempt to understand the oxidation resistance of the SiCN and SiO 3)-( 5); the mass gain in the Hf-containing SiCN is attributed to the oxidation of mixed bond structural units of SiC x N 4−x . 18,35 𝐶 free (𝑠) + 𝑂 2 (𝑔) → CO 2 (𝑔)…”

Section: Oxidationmentioning

confidence: 99%

“…11 The main drawback of the transition metal oxides is their transformation to different polymorphs. [12][13][14][15][16] Polymer-derived SiCN ceramics show superior thermal characteristics (such as resistance to creep, oxidation, and corrosion) to SiC and SiOC ceramics up to 1500 • C. 6,8,9,17,18 SiAlCN, 19 SiTiCNO, 18,20 SiZrCNO, 17,21,22 SiBCN, 23 SiHfCNO, 15,24 and SiHfBCN 25 ceramics of different nanostructures have been developed through modification of initial precursors in order to enhance the required properties of SiCN ceramics. Several studies related to the incorporation of active and passive fillers have proven that reinforcements enhance the thermal and mechanical properties of SiCN.…”

Section: Introductionmentioning

confidence: 99%

“…26 For example, the thermal stability of SiCN after incorporation of boron at the molecular level increased to as high as 2000-2200 • C. 27 Al, Zr, and Ti incorporation into SiCN improved oxidation resistance by forming high-temperature stable phases such as mullite, ZrO 2 , and TiO 2 within the ceramic structures, respectively. 17,18,28 An interphase composite of SiCN-HfO 2 (5 vol%) shows higher density, flexural strength, and hydrothermal resistance than the particulate composite with HfO 2 (50 vol%) and SiCN. 29 The distribution of the phases within the ceramics has a significant impact on the properties of the final ceramics.…”

Section: Introductionmentioning

confidence: 99%

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Structural evolution and oxidation resistance of polysilazane‐derived SiCN–HfO₂ ceramics

Anand,

Lu,

Nayak

et al. 2023

J Am Ceram Soc.

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Polymer‐derived SiCN materials have great application potential in high‐temperature environments. In the current work, SiCN ceramics were tailored with Hf incorporation through doping of a molecular precursor in the preceramic polymer. The ceramics remained in a single amorphous phase up to 900°C. Further annealing caused nucleation and crystallization of tetragonal hafnium oxide (t‐HfO2) within the SiCN matrix, resulting in a unique glass–ceramic nanocomposite of t‐HfO2–SiCN. The crystal sizes of t‐HfO2 were in the range of 2.3–5.1 nm. Raman spectroscopy was employed to examine the effect of Hf‐doping on the phase separation and crystallization of sp2‐carbon. Thermal stability in an oxidizing environment was analyzed by thermogravimetry. The incorporation of Hf in the SiCN ceramic system led to improved phase stability and oxidation resistance compared to the undoped SiCN system.

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A Novel TiO2–TiC–TiC0.3N0.7–C–SiCN Multiphase Ceramic Nanocomposite from Preceramic Polymer Pyrolysis

Anand

Nayak

Behera

2022

J Inorg Organomet Polym

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Phase, nanostructure, and oxidation of precursor derived SiCN–TiO2 ceramic nanocomposites

Cited by 15 publications

References 91 publications

Polymer‐Derived High‐Temperature Nonoxide Materials: A Review

Polymer‐Derived High‐Temperature Nonoxide Materials: A Review

Structural evolution and oxidation resistance of polysilazane‐derived SiCN–HfO₂ ceramics

A Novel TiO2–TiC–TiC0.3N0.7–C–SiCN Multiphase Ceramic Nanocomposite from Preceramic Polymer Pyrolysis

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Phase, nanostructure, and oxidation of precursor derived SiCN–TiO2 ceramic nanocomposites

Cited by 15 publications

References 91 publications

Polymer‐Derived High‐Temperature Nonoxide Materials: A Review

Polymer‐Derived High‐Temperature Nonoxide Materials: A Review

Structural evolution and oxidation resistance of polysilazane‐derived SiCN–HfO2 ceramics

A Novel TiO2–TiC–TiC0.3N0.7–C–SiCN Multiphase Ceramic Nanocomposite from Preceramic Polymer Pyrolysis

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Structural evolution and oxidation resistance of polysilazane‐derived SiCN–HfO₂ ceramics