Phase stability, microstructure and high-temperature properties of NbSi2- and TaSi2-oxide conducting ceramic composites

Yakaboylu, Gunes A.; Sabolsky, Katarzyna; Sabolsky, Edward M.

doi:10.1007/s10853-018-2297-1

Cited by 9 publications

(4 citation statements)

References 55 publications

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“…Furthermore, Rietveld refinement results in the authors’ previous study [14] demonstrated that ~20.2 vol % of a secondary Mo 5 Si 3 phase formed in the [90–10] MoSi 2 -Al 2 O 3 composite after sintering. Studies reported that the presence of the metal silicide phases with 5-3 stoichiometry could be also beneficial for high-temperature applications due to their higher melting points, good thermal stability, high resistance to creep, and sufficient mechanical strength [21,22,23]. It is important to point out that these secondary phases could significantly affect not only the thermoelectric properties of the fabricated ceramic composite thermocouples, but also their stability and mechanical and thermal properties at elevated temperatures.…”

Section: Resultsmentioning

confidence: 99%

“…It is known from the authors’ previous studies [15,21] that these metal silicides have random morphology with 4.2–6.4 µm average particle size, whereas alumina particles have equiaxed morphology and an average size of 0.4 µm. Therefore, the agglomeration of large (silicide) and small (alumina) grains was evident in certain regions for all composite microstructures.…”

Section: Resultsmentioning

confidence: 99%

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Fabrication and Thermoelectric Characterization of Transition Metal Silicide-Based Composite Thermocouples

Yakaboylu

Pillai

Sabolsky

et al. 2018

Sensors

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Metal silicide-based thermocouples were fabricated by screen printing thick films of the powder compositions onto alumina tapes followed by lamination and sintering processes. The legs of the embedded thermocouples were composed of composite compositions consisting of MoSi2, WSi2, ZrSi2, or TaSi2 with an additional 10 vol % Al2O3 to form a silicide–oxide composite. The structural and high-temperature thermoelectric properties of the composite thermocouples were examined using X-ray diffraction, scanning electron microscopy and a typical hot–cold junction measurement technique. MoSi2-Al2O3 and WSi2-Al2O3 composites exhibited higher intrinsic Seebeck coefficients (22.2–30.0 µV/K) at high-temperature gradients, which were calculated from the thermoelectric data of composite//Pt thermocouples. The composite thermocouples generated a thermoelectric voltage up to 16.0 mV at high-temperature gradients. The MoSi2-Al2O3//TaSi2-Al2O3 thermocouple displayed a better performance at high temperatures. The Seebeck coefficients of composite thermocouples were found to range between 20.9 and 73.0 µV/K at a temperature gradient of 1000 °C. There was a significant difference between the calculated and measured Seebeck coefficients of these thermocouples, which indicated the significant influence of secondary silicide phases (e.g., Mo5Si3, Ta5Si3) and possible local compositional changes on the overall thermoelectric response. The thermoelectric performance, high sensitivity, and cost efficiency of metal silicide–alumina ceramic composite thermocouples showed promise for high-temperature and harsh-environment sensing applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Fabrication and Thermoelectric Characterization of Transition Metal Silicide-Based Composite Thermocouples

Yakaboylu

Pillai

Sabolsky

et al. 2018

Sensors

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“…They found that the room temperature and high‐temperature fracture toughness can reach 6.46 and 21.881 MPa m 0.5 , respectively. Yakaboylu et al 13,14 . studied the stability and electrical properties of MoSi 2 and WSi 2 with 40–80 vol.% fine and coarse Al 2 O 3 , and ZrO 2 particles.…”

Section: Introductionmentioning

confidence: 99%

“…They found that the room temperature and high-temperature fracture toughness can reach 6.46 and 21.881 MPa m 0.5 , respectively. Yakaboylu et al 13,14 studied the stability and electrical properties of MoSi 2 and WSi 2 with 40-80 vol.% fine and coarse Al 2 O 3 , and ZrO 2 particles. Then they reported the phase stability, microstructural evolution, oxidation kinetics, and electrical properties of TaSi 2 and NbSi 2 with the addition of 40-70 vol.% Al 2 O 3 and ZrO 2 particles for future hightemperature applications in advanced sensing and the high-temperature electrical conductivities of these composites at 900 • C ranged from 5.3 to 111.3 S/cm.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and electrical properties of 3Y‐TZP/TiSi₂ composites sintered at different temperatures

Liu,

Huang,

Chen

et al. 2024

Int J Applied Ceramic Tech

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Various amounts of TiSi2 (30, 40, and 50 wt.%) were added to 3 mol% yttria stabilized tetragonal zirconia polycrystals (3Y‐TZP) to fabricate 3Y‐TZP/TiSi2 composites by vacuum sintering. The effects of the TiSi2 added amount, as well as the sintering temperature on the microstructure, mechanical, and electrical characteristics of the 3Y‐TZP/TiSi2 composites were examined. The sintered samples consisted of three phases: tetragonal (t‐ZrO2), TiSi2, and reaction product Ti5Si3. The maximum bending strength and relative density of the composites, reaching 501.20 MPa and 98.59% respectively, were achieved at a TiSi2 content of 30 wt.% and sintering temperature of 1500°C. The resistivity of 3Y‐TZP/TiSi2 composites showed a nonlinear decrease with increasing TiSi2 content. These results indicated that 3Y‐TZP/TiSi2 composites had a typical percolation threshold phenomenon due to the different TiSi2 content and a conductivity model of 3Y‐TZP/TiSi2 composites at room temperature was founded on the generalized effective medium equation. The resistivity of the composites could optionally adjust between 102 and 10−4Ω·cm with 30–50 wt.% TiSi2 under room temperature. Overall, the 3Y‐TZP/TiSi2 composites show great potential for applications in the heat‐not‐burn tobacco field.

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Insight into the vacancy effects on mechanical and electronic properties of Tantalum Silicide

Chen

Zhang

et al. 2020

Ceramics International

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Phase stability, microstructure and high-temperature properties of NbSi2- and TaSi2-oxide conducting ceramic composites

Cited by 9 publications

References 55 publications

Fabrication and Thermoelectric Characterization of Transition Metal Silicide-Based Composite Thermocouples

Fabrication and Thermoelectric Characterization of Transition Metal Silicide-Based Composite Thermocouples

Mechanical and electrical properties of 3Y‐TZP/TiSi₂ composites sintered at different temperatures

Insight into the vacancy effects on mechanical and electronic properties of Tantalum Silicide

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Phase stability, microstructure and high-temperature properties of NbSi2- and TaSi2-oxide conducting ceramic composites

Cited by 9 publications

References 55 publications

Fabrication and Thermoelectric Characterization of Transition Metal Silicide-Based Composite Thermocouples

Fabrication and Thermoelectric Characterization of Transition Metal Silicide-Based Composite Thermocouples

Mechanical and electrical properties of 3Y‐TZP/TiSi2 composites sintered at different temperatures

Insight into the vacancy effects on mechanical and electronic properties of Tantalum Silicide

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Mechanical and electrical properties of 3Y‐TZP/TiSi₂ composites sintered at different temperatures