Ceramic nanocomposites prepared via the in situ formation of a novel TiZrN2 nanophase in a polymer-derived Si3N4 matrix

Bechelany, Mirna Chaker; Lale, Abhijeet; Balestrat, Maxime; Gervais, Christel; Malo, Sylvie; Nishihora, Rafael Kenji; Bernard, Samuel

doi:10.1016/j.jeurceramsoc.2022.04.006

Cited by 4 publications

(5 citation statements)

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“…Heat treatment in flowing N 2 produced TiZrN 2 nanocrystals in α‐ and β‐Si 3 N 4 phases at 1500 °C, and the crystal size was as small as 9 nm. [ 129 ] Figure a shows a significant extent of crystallization, and the selected‐area electron diffraction (SAED) pattern originates from silicon and transition metal nitride phases. The nanocrystals in Figure 14a,b are TiZrN 2 (Figure 14c) and Si 3 N 4 (Figure 14d) phases.…”

Section: Silicon Nitride Materialsmentioning

confidence: 99%

“…High‐resolution transmission electron images of Si 3.0 Ti 0.7 Zr 0.8 N 5.0 after heat treatment at 1500 °C. [ 129 ] a,b) Different crystallization regions, c) TiZrN 2 phase, and d) Si 3 N 4 phase. (Reprinted with permission.…”

Section: Silicon Nitride Materialsmentioning

confidence: 99%

“…Oxygen contamination, high crystallinity composites, infiltration of precursors may be used, and high-temperature pyrolysis leads to ultrahigh-temperature phases Polymer-to-ceramic conversion completes at 800 °C, [104] 10-150 nm crystalline size, [4a,107] crystallization occurs from 1150°to 2000°. [104,105,107,108] Silicon nitride Oxygen contamination and thermal decomposition of silicon salts may be used, SiC/Si 3 N 4 ratio can be tuned, Si 3 N 4 crystallization temperature increases with C/Si atomic ratio, and mixtures of crystalline phases are buried in an amorphous matrix 70-80% yield, [111] amorphous-to-α-Si 3 N 4 crystalline transition at >1150 °C, [111,114] crystal size can be <10 nm, [129] Si 3 N 4 crystallization from SiCN starts at ≥1600 °C. [125,128] Mixed composites Decreased pyrolysis shrinkage, increased ceramic yield, intermediate species formation, suppressed SiC crystal growth, decreased oxygen and free C contents, and refractory metal species addition Polymer-to-ceramic conversion at <900 °C, [130] crystal size varies from 2 to 20 nm.…”

Section: Materials Characteristics Specificsmentioning

confidence: 99%

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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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Section: Silicon Nitride Materialsmentioning

confidence: 99%

Section: Silicon Nitride Materialsmentioning

confidence: 99%

Section: Materials Characteristics Specificsmentioning

confidence: 99%

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Polymer‐Derived High‐Temperature Nonoxide Materials: A Review

Zhou

2023

Adv Eng Mater

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“…The Polymer-Derived Ceramics (PDCs) route – via in situ growth and materials nano-structuring 23,24 represents an effective precursor approach for designing and synthesizing porous SiC – acting as a matrix – containing in situ generated nanoscale UHTC such as nanoTiC 25 or nanoTiN. 26…”

Section: Introductionmentioning

confidence: 99%

“…The Polymer-Derived Ceramics (PDCs) route -via in situ growth and materials nano-structuring 23,24 represents an effective precursor approach for designing and synthesizing porous SiC -acting as a matrix -containing in situ generated nanoscale UHTC such as nanoTiC 25 or nanoTiN. 26 Herein, the synthesis and processing of porous nanocomposites consisting of TiC nanocrystals which are in situ generated in a SiC matrix upon modification of preceramic polymers with Ti-containing precursors (tetrakis(dimethylamino)titanium, Ti[N(CH 3 ) 2 ] 4 ) is addressed.…”

Section: Introductionmentioning

confidence: 99%