Thermal conductivity of precursor derived Si–B–C–N ceramic foams using Metroxylon sagu as sacrificial template

Kousaalya, Adhimoolam Bakthavachalam; Kumar, Ravi; Sridhar, B. T. N.

doi:10.1016/j.ceramint.2014.09.044

Cited by 20 publications

(5 citation statements)

References 32 publications

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“…22 Conversely, κ of SiBCN ceramic, containing crystalline SiO 2 (due to oxygen contamination during processing), exhibited temperature-invariant κ until 1000 °C. 7 This indicates that SiO 2 (amorphous/crystalline) significantly influences thermal conduction behavior of PDCs. In this regard, the exact role of SiO 2 in influencing the mechanism of thermal conductivity of PDCs is yet to be fully understood.…”

Section: Acs Applied Materials and Interfacesmentioning

confidence: 96%

“…For instance, although temperature-invariant κ behavior was reported for amorphous polymer-derived SiOC, increase in κ has been observed for amorphous nonoxide PDCs (such as SiCN and SiBCN) with increase in measurement temperature . Conversely, κ of SiBCN ceramic, containing crystalline SiO 2 (due to oxygen contamination during processing), exhibited temperature-invariant κ until 1000 °C . This indicates that SiO 2 (amorphous/crystalline) significantly influences thermal conduction behavior of PDCs.…”

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confidence: 98%

“…To address these concerns, we have evaluated polymer-derived ceramics (PDCs) processed via thermolysis of silicon-based polymers in this study. PDCs possess the ability to become the next-generation sustainable thermoelectrics due to their inherent advantages of: (a) bottom-up synthesis that enables fine-tuning of ceramic microstructure and properties; (b) presence of nontoxic, inexpensive elements; (c) excellent high-temperature mechanical properties and high thermal stability (>2000 °C); and (d) ease of low-temperature processing (<800 °C). , Further, PDCs can exhibit thermoelectric properties due to the simultaneous presence of an amorphous matrix that lowers thermal conductivity (κ), − and free carbon (i.e., graphitic-like carbon) phase in a percolating network that enhances electrical conductivity (σ). ,, Although many studies have been undertaken to understand both these properties for PDCs, ,− there has been little if any published data that fully elucidate the entirety of their TE behavior.…”

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confidence: 99%

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Polymer-Derived Silicon Oxycarbide Ceramics as Promising Next-Generation Sustainable Thermoelectrics

Kousaalya

Zeng

Karakaya

et al. 2018

ACS Appl. Mater. Interfaces

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We demonstrate the potential of polymer-derived ceramics (PDC) as next-generation sustainable thermoelectrics. Thermoelectric behavior of polymer-derived silicon oxycarbide (SiOC) ceramics (containing hexagonal boron nitride (h-BN) as filler) was studied as a function of measurement temperature. SiOC, sintered at 1300 °C exhibited invariant low thermal conductivity (∼1.5 W/(m·K)) over 30-600 °C, coupled with a small increase in both Seebeck coefficient and electrical conductivity, with increase in measurement temperature (30-150 °C). SiOC ceramics containing 1 wt % h-BN showed the highest Seebeck coefficient (-33 μV/K) for any PDC thus far.

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Section: Acs Applied Materials and Interfacesmentioning

confidence: 96%

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confidence: 98%

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confidence: 99%

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Polymer-Derived Silicon Oxycarbide Ceramics as Promising Next-Generation Sustainable Thermoelectrics

Kousaalya

Zeng

Karakaya

et al. 2018

ACS Appl. Mater. Interfaces

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“…Kousaalya et al investigated thermal properties of amorphous SiBNC foams at high temperatures. They reported an increase in thermal conductivity from 0.40 to 1.8 W m −1 K −1 upon increasing temperature from 300 to 1200°C . Previous computational studies addressed Si 3 B 3 N 7 .…”

Section: Introductionmentioning

confidence: 99%

Computational study of impact of composition, density, and temperature on thermal conductivity of amorphous silicon boron nitride

Dasmahapatra

Kroll

2018

J Am Ceram Soc

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We study thermal conductivity (j) of amorphous silicon boron nitride (a-SiBN) for different compositions and densities as a function of temperature using density functional theory (DFT) calculations and equilibrium molecular dynamic (MD) simulations. Our library of amorphous structures consists of network models comprising 100-200 atoms and large-scale models with up to 57 000 atoms generated using the empirical Marian-Gastreich two-body potential. Crystalline structures within the Si 3 N 4 -BN system are considered as well. We use 2 distinct approaches to compute thermal conductivity of a-SiBN. To estimate j in the high-temperature limit we feed Clarke's phenomenological model with elasticity data obtained by DFT calculations. We further perform equilibrium MD simulations and apply the Green-Kubo method. This approach shows decrease of j with increasing temperature and provides results at high temperatures that agree with results derived within Clarke's model. We find that j of a-SiBN depends on composition and increases as the BN content in the structure increases. The effect is pronounced at low temperature but almost vanishes at high temperature. Furthermore, thermal conductivity depends on density and porosity, with a linear relation between j and density.

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“…The prepared ceramic cores have no cracks or pores, and exhibit good mechanical properties. Common ceramic precursors mainly include polysiloxane, polysilazane (PSZ), and polysiloxane containing silicon atoms in the main chain [19,20] . After the green body is formed, precursors are converted into SiOC, SiCN and SiC ceramics by high temperature pyrolysis.…”

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confidence: 99%

Effect of sintering temperature on microstructure and properties of 3D printing polysilazane reinforced Al2O3 core

Dong,

Li,

Chen

et al. 2023

China Foundry

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Ceramic cores are the key intermediate components of hollow blades for aero-engine, which affect the reliability and heat resistance of blades with complex cooling channels [1][2][3][4][5] . Therefore, the high precision of ceramic cores has been the goal of industry and academy. Conventional processes, such as hot-press moulding and gel film casting, are mature and high efficiency for ceramic cores with simple structures [6][7][8] .

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Thermal conductivity of precursor derived Si–B–C–N ceramic foams using Metroxylon sagu as sacrificial template

Cited by 20 publications

References 32 publications

Polymer-Derived Silicon Oxycarbide Ceramics as Promising Next-Generation Sustainable Thermoelectrics

Polymer-Derived Silicon Oxycarbide Ceramics as Promising Next-Generation Sustainable Thermoelectrics

Computational study of impact of composition, density, and temperature on thermal conductivity of amorphous silicon boron nitride

Effect of sintering temperature on microstructure and properties of 3D printing polysilazane reinforced Al2O3 core

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