Coarsening kinetics of nanostructured ZrO2 in Zr-doped SiCN ceramic hybrids

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

doi:10.1016/j.jallcom.2019.151939

Cited by 16 publications

(10 citation statements)

References 17 publications

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“…Despite this, the LSW model provides a simple method of estimating kinetic parameters needed for more advanced calculations, without knowledge of the fundamental thermodynamic parameters. The LSW model has been successfully applied to other complex ceramics, such as (SiOC)-HfO 2 and SiZrCNO [25,26].…”

Section: Secondary-phase Coarsening Kineticsmentioning

confidence: 99%

Nucleation and growth behavior of multicomponent secondary phases in entropy-stabilized oxides

Dupuy

Chellali

Hahn

et al. 2022

Journal of Materials Research

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The rocksalt structured (Co,Cu,Mg,Ni,Zn)O entropy-stabilized oxide (ESO) exhibits a reversible phase transformation that leads to the formation of Cu-rich tenorite and Co-rich spinel secondary phases. Using atom probe tomography, kinetic analysis, and thermodynamic modeling, we uncover the nucleation and growth mechanisms governing the formation of these two secondary phases. We find that these phases do not nucleate directly, but rather they first form Cu-rich and Co-rich precursor phases, which nucleate in regions rich in Cu and cation vacancies, respectively. These precursor phases then grow through cation diffusion and exhibit a rocksalt-like crystal structure. The Cu-rich precursor phase subsequently transforms into the Cu-rich tenorite phase through a structural distortion-based transformation, while the Co-rich precursor phase transforms into the Co-rich spinel phase through a defect-mediated transformation. Further growth of the secondary phases is controlled by cation diffusion within the primary rocksalt phase, whose diffusion behavior resembles other common rocksalt oxides. Graphical abstract

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Section: Secondary-phase Coarsening Kineticsmentioning

confidence: 99%

Nucleation and growth behavior of multicomponent secondary phases in entropy-stabilized oxides

Dupuy

Chellali

Hahn

et al. 2022

Journal of Materials Research

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“…PDCs have processing flexibility that allows them to achieve any desired shape, control of nanostructure of the final ceramic product (by tuning the precursor chemistry), low processing temperature, and the ease of composite fabrication . In addition, elemental doping and the addition of fillers, including B, Al, ZrO 2 , TiO 2 , and HfO 2 , are possible for PDCs. Depending on the elemental configurations, Si-based PDCs can be used in various high-temperature applications involving coatings, sensors, reinforcement, or matrices .…”

Section: Introductionmentioning

confidence: 99%

Evaluating Use of Boron- and Hafnium-Modified Polysilazanes for Ceramic Matrix Minicomposites

2022

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In this study, the potential of polymer-derived ceramic matrix composites (CMCs) is demonstrated by the addition of thin ceramic coatings on carbon fiber (CF) bundles. Boron-and hafnium-modified polysilazane liquid precursors were synthesized and used to infiltrate the fiber bundles of CF to fabricate lab-scale Si(B)CN/CF and Si(Hf)CN/CF CMC minicomposites, respectively by crosslinking and then pyrolysis at 800 °C. The crosslinked precursor to ceramic yield was observed to be as high as 90% when the procedure was carried out in inert environment. The Si(B)CN/CF contained Si−N and B−N bonds, while Si−N and Hf−O−Si bonds were observed for the Si(Hf)CN/CF sample with uniform and dense surfaces. Room-temperature tensile tests showed that the Si(Hf)CN/CF sample could reach a tensile strength of ∼790 MPa and an elastic modulus of 66.88 GPa among the composites. An oxidation study of the Si(Hf)CN/CF minicomposites showed higher stability compared to SiCN/CF and Si(B)CN/CF minicomposites up to 1500 °C.

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“…SiOC PDCs have amorphous microstructures of mixed SiO 4−x C x that separate into SiO 2 , SiC and C at high temperatures and ultimately degrade into SiC and CO gas (>1300 • C). Incorporating other elements, such as B [8,[10][11][12], Al [13][14][15], Nb [16], Zr [4,17,18], Ti [19][20][21], or Hf [12,[22][23][24], in the Si-C-N or Si-O-C systems may greatly enhance the thermostability of ceramic products by preventing or impeding the crystallization and phase segregation of the ceramic phases in inert or oxidizing environments [7]. Initially, at the crosslinking stage, B atoms may improve the formation of the crosslinking network and increase the yield and structural density of SiBOC [11,12].…”

Section: Introductionmentioning

confidence: 99%

“…Further information on the processing/manufacturing [6,[26][27][28][29][30][31][32], physical and mechanical properties [26][27][28][29][30][31][33][34][35][36][37] and micro/nanostructures [5,26,27,29,31,32,34,35,[38][39][40] of PDCs can be found in the previously published review articles. Incorporating other elements, such as B [8,[10][11][12], Al [13][14][15], Nb [16], Zr [4,17,18], Ti [19][20][21], or Hf [12,[22][23][24], in the Si-C-N or Si-O-C systems may greatly enhance the thermostability of ceramic products by preventing or impeding the crystallization and phase segreg...…”

Section: Introductionmentioning

confidence: 99%

“…After forming additional microstructures, the presence of TiO 2 , HfO 2 or ZrO 2 in the amorphous PDC matrix prevent the crystallization and decomposition of the amorphous phase [18,21,24]. Recent work has shown that presence of TiO 2 nanocrystals improves the viscosity of the PDC microstructures at elevated temperatures which deters collapse in the TiO 2 /SiO 2 structure [21].…”

Section: Introductionmentioning

confidence: 99%

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High-Temperature Properties and Applications of Si-Based Polymer-Derived Ceramics: A Review

2021

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Ceramics derived from organic polymer precursors, which have exceptional mechanical and chemical properties that are stable up to temperatures slightly below 2000 °C, are referred to as polymer-derived ceramics (PDCs). These molecularly designed amorphous ceramics have the same high mechanical and chemical properties as conventional powder-based ceramics, but they also demonstrate improved oxidation resistance and creep resistance and low pyrolysis temperature. Since the early 1970s, PDCs have attracted widespread attention due to their unique microstructures, and the benefits of polymeric precursors for advanced manufacturing techniques. Depending on various doping elements, molecular configurations, and microstructures, PDCs may also be beneficial for electrochemical applications at elevated temperatures that exceed the applicability of other materials. However, the microstructural evolution, or the conversion, segregation, and decomposition of amorphous nanodomain structures, decreases the reliability of PDC products at temperatures above 1400 °C. This review investigates structure-related properties of PDC products at elevated temperatures close to or higher than 1000 °C, including manufacturing production, and challenges of high-temperature PDCs. Analysis and future outlook of high-temperature structural and electrical applications, such as fibers, ceramic matrix composites (CMCs), microelectromechanical systems (MEMSs), and sensors, within high-temperature regimes are also discussed.

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Coarsening kinetics of nanostructured ZrO2 in Zr-doped SiCN ceramic hybrids

Cited by 16 publications

References 17 publications

Nucleation and growth behavior of multicomponent secondary phases in entropy-stabilized oxides

Nucleation and growth behavior of multicomponent secondary phases in entropy-stabilized oxides

Evaluating Use of Boron- and Hafnium-Modified Polysilazanes for Ceramic Matrix Minicomposites

High-Temperature Properties and Applications of Si-Based Polymer-Derived Ceramics: A Review

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