Novel polymer derived ceramic-high temperature heat flux sensor for gas turbine environment

Nagaiah, Narasimha; Kapat, Jay; An, Li; Chow, L. C.

doi:10.1088/1742-6596/34/1/075

Cited by 37 publications

(28 citation statements)

References 4 publications

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“…[3][4][5] It has been shown that PDCs remain stable up to 1400-1500 • C and, in special cases, even at 2000 • C. 6 The PDCs have been shown to hold promise for high temperature membranes, oxidation resistant coatings, and flux sensors for gas turbine engines. [7][8][9] In addition to their structural properties and chemical stability, the PDCs also possess functional properties of different kinds. They are semiconductors at least up to 1300 • C. 10 Though amorphous, they are intensely photoluminescent 11 with a wide spectrum emission.…”

Section: Introductionmentioning

confidence: 99%

Giant piezoresistivity of polymer-derived ceramics at high temperatures

Terauds

Jiménez

Raj

et al. 2010

Journal of the European Ceramic Society

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Section: Introductionmentioning

confidence: 99%

Giant piezoresistivity of polymer-derived ceramics at high temperatures

Terauds

Jiménez

Raj

et al. 2010

Journal of the European Ceramic Society

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“…The parallel orientations of micropillars separated by air or a solid infiltrating phase with low heat conductivity offers a potential for heat‐flow substrates in high‐performance electronics with a highly anisotropic heat transfer. Anisotropic heat flux combined with excellent high temperature resistance to oxidation might be of interest for heat flux sensor devices to be applied in propulsion systems 36 …”

Section: Resultsmentioning

confidence: 99%

“…Anisotropic heat flux combined with excellent high temperature resistance to oxidation might be of interest for heat flux sensor devices to be applied in propulsion systems. 36 It was shown previously that extraction of metals from carbides by halogens or their compounds leads to the formation of free carbon with various structures called carbide-derived carbon (CDC). 37,38 For SiC and b-SiC whiskers, it has been reported that the Si component is preferentially attacked and a carbon-rich layer builds up in the reaction with chlorine-or fluorine-containing gases at temperatures 46001C.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Silicon Carbide Micropillar Arrays from Polycarbosilanes

Jang

Zollfrank

Jank

et al. 2010

Journal of the American Ceramic Society

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Periodic patterns of silicon carbide (SiC) micropillars of 18 μm in length and 2 μm in diameter with a hexagonal morphology and an areal number density of micropillars of 6 × 104 mm−2 were fabricated from a mixture of two different polycarbosilane ceramic precursors. The polycarbosilanes (PCS) were molded into polydimethylsiloxane (PDMS) micromolds processed from a silicon wafer master. After cross‐linking between 200° and 400°C, debonding from the elastomeric PDMS mold yielded freestanding structures of PCS micropillars. Due to the low stiffness of cross‐linked PCS (E∼2.5 GPa), surface adhesion forces might result in the deformation of the micropillars into ordered domains. The PCS micropillar arrays were pyrolyzed in inert atmosphere at 900° and 1500°C to yield amorphous and nanocrystalline SiC (β‐SiC) with crystallite sizes in the range of tenths of micrometers, respectively. The formation of domains due to instability of micropillars with a high aspect ratio might be of specific interest for electrical engineering and catalytic applications.

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“…40 and 135 for polycrystalline silicon and single crystal silicon, respectively . Additionally, PDCs show excellent chemical and mechanical properties (eg, high thermal stability, good oxidation/corrosion resistance, and good creep resistance under extreme environments), making PDCs promising materials for the development of harsh environment sensors …”

Section: Introductionmentioning

confidence: 99%

Low‐frequency dielectric dispersion in polymer‐derived amorphous silicon carbonitride ceramics

Cao

Zhu

et al. 2018

J Am Ceram Soc

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The dielectric response of polymer‐derived amorphous silicon carbonitride (PDC‐SiCN) material was studied over a wide frequency range from 1 mHz to 10 MHz. Aside from presenting a relaxation process over 105 to 0.03 Hz frequency range, the material showed a strong low‐frequency dielectric dispersion (LFDD), which resulted in extremely high permittivities (up to 105) at frequencies lower than 0.03 Hz. It is identified that this LFDD resulted from relaxation process was not induced by conductivity. Therefore, PDC‐SiCN material showed two relaxation processes. Based on its microstructure, two polarization mechanisms were proposed for PDC‐SiCN: a mechanism based on polarons generated by unpaired electrons present in the material and an interfacial polarization mechanism as a result of different properties of SiCxN4−x matrix and free‐carbon clusters. Interfacial polarization process was simulated based on a parallel plate model involving two different materials. The result indicated that the relaxation time of an interfacial polarization can be distributed over a broad time range in the material.

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Novel polymer derived ceramic-high temperature heat flux sensor for gas turbine environment

Cited by 37 publications

References 4 publications

Giant piezoresistivity of polymer-derived ceramics at high temperatures

Giant piezoresistivity of polymer-derived ceramics at high temperatures

Fabrication of Silicon Carbide Micropillar Arrays from Polycarbosilanes

Low‐frequency dielectric dispersion in polymer‐derived amorphous silicon carbonitride ceramics

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