Thermal expansion coefficient prediction of fuel-cell seal materials from silica sand

Hidayat, Nurul; Triwikantoro, T.; Baqiya, Malik Anjelh; Pratapa, Suminar

doi:10.1063/1.4821002

Cited by 8 publications

(7 citation statements)

References 5 publications

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“…CTE of the composites is closely associated with the formation of the phases. Calculation based on RoM [4] shows that the CTE values of the composites are 11.20 ppm/°C for the composite sintered for 1 hour and 11.55 ppm/°C for 4 hours one.…”

Section: Resultsmentioning

confidence: 99%

“…Their electrical resistivity was tested by four point probe method. Vickers microhardness tests were performed on the composites to examine the mechanical strength, while the associated CTE were calculated based on Rule of Mixture (RoM) [4].…”

Section: Methodsmentioning

confidence: 99%

“…A glass-ceramic seal is the most preferred material today because it has superior sealing performances compared to other types [1][2][3]. Hidayat [4] has developed one of seal materials based on SiO 2 -MgO system with predicted TEC values range of 9.5-12 ppm/°C, but relatively high porosity, i.e. 30-40 %, very much larger than that of the required criteria.…”

Section: Introductionmentioning

confidence: 99%

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Use of Natural Silica Sand as a Component for Prospective Fuel Cell Sealing Materials

Musyarofah

Nurbaiti

Dewa

et al. 2015

AMR

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A study to enhance the value of natural silica sand from Tanah Laut, South Kalimantan, Indonesia has been initiated. A number of local sands were selected as the candidates for the study. The selected sand contained more than 90% quartz and was further processed to obtain a high purity initial powder using magnetic separation and immersion with HCl. The sealing materials were prepared by mixing the natural-sand-based silica (SiO2) powder with magnesia (MgO) and boria (B2O3) with composition of 70:10:20 by weight followed by uniaxial pressing and finally sintering at 1150°C for 1h and 4 h to produce ceramic composites. XRD measurement revealed that the ceramic contained quartz, protoenstatite, and clinoenstatite. The 1h and 4h ceramics exhibited 1.89% and 0.43% apparent porosity, 7.00 106 and 6.63106 cm electrical resistivity, 3.60 and 2.29 GPa Vickers microhardness, and 11.2010-6 and 11.5510-6 ppm/°C thermal expansion coefficient respectively. The 4h sample is more appropriate for sealing function in fuel cell than the 1h sample.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Use of Natural Silica Sand as a Component for Prospective Fuel Cell Sealing Materials

Musyarofah

Nurbaiti

Dewa

et al. 2015

AMR

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“…The typical silica sands were ball-milled at 150 rpm for 60 minutes followed by sintering at 1000 °C for other 60 minutes. The elemental contents of the prepared SiO 2 were reported elsewhere [19,20]. Alumina (PA, Sigma-Aldrich) with various concentrations were ground with the prepared silica before 4-hour sintering at 1150 °C and 1250 °C.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…It can be revealed from the facts that (1) Indonesia is the largest archipelagic nation with roughly 67% sea and (2) it is one of the world's top five countries with the longest coastlines imply many advantages regarding its mineral resources [18]. Also, our previous preliminary studies [19,20] reported that Indonesian silica sand from coastal district of Tuban comprised of very high quartz-SiO 2 content. The results lead to a must-solved research question of establishing the potential of natural silica sand/alumina ceramic composites for fuel-cell sealants that is described in this paper.…”

Section: Introductionmentioning

confidence: 99%

Natural Silica Sand/Alumina Ceramic Composites: Promising Candidates for Fuel-Cell Sealants

Hidayat

Istiqomah²,

Widianto

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. An attempt has been developed to establish the prospect of the useful application of Indonesian natural silica sand, instead of commercially expensive materials, as a future fuel-cell sealant. The sand was initially washed and ball-milled at 150 rpm for 60 minutes and then heated at 1000 C for the same duration. The resulting powder was then mixed with alumina powder at various amounts and shaped into discs before sintering at 1150 C and 1250 C to produce compact ceramics. The diameter shrinkage, porosity, and density of the ceramics were evaluated by Archimedes method. Their crystalline phase composition was quantified by Rietveld refinement analysis on the X-ray diffraction (XRD) data and the phase weight fraction was then used for coefficient of thermal expansion (CTE) evaluation. It was observed that the bulk density increased while the porosity decreased with alumina addition. The XRD data analysis revealed that the prepared silica sand contains a very high purity of quartz-SiO 2 , i.e. 97.8(18)%. The sintering temperatures of 1150 C and 1250 C transformed some quartz-SiO 2 to crystobaliteSiO 2 . All the calcite-CaCO 3 exhibited reaction sintering with SiO 2 forming wollastonite-CaSiO 3 . Therefore, the ceramic composites contained SiO 2 /Al 2 O 3 /CaSiO 3 . Regarding CTE, all of the composites meet the criteria for fuel-cell sealants, in the range of 9-12 ppm/C.Keywords: Indonesian silica sand, alumina, phase quantification, coefficient of thermal expansion, fuel-cell sealant. [5]. The SOFCs, devices that convert the chemical energy of fuels into electricity, have been extensively studied to reduce CO 2 emission and fossil fuel consumption [6]. In spite of this, it is confronted with a challengeable task on preventing leakage when an SOFC operates at high temperature (800-1000 °C) [7]. Consequently, a proper gas-tight sealing material plays a decisive role to obtain the best operation and performance of SOFCs [8]. The very basic criteria for fuel cell sealing material are the CTE, which must be in the range of 9-12 ppm/°C [9], and thermo-mechanically and chemically stable [10]. The matching of CTE of the fuel-cell sealing materials to other cell components is essential to minimize the thermal stresses [11].Recently, ceramic-based composites and glass-ceramics have become highly recommended sealing materials for various SOFCs attributable to their superior characteristics compared with those of metallic sealants, mainly to resist both reducing and oxidizing environments [12,13]. Additionally, they also perform excellent gas tightness and provide CTE similar to those of the other stack components [14]. Numerous investigations have been conducted in search of great fuel cell sealants, e.g. 30CaO- . However, rarely has a research exclusively explored the use of natural silica-based materials as the SiO 2 source for fuel cell sealants production.In this present study, we introduce the prospect of using Indonesian silica sand as the fuel cell sealing material. This breakthrough is crucial not on...

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Thermal cycling study of prospective fuel-cell sealants from silica-sand/alumina composites

Hidayat

Baqiya

Triwikantoro

et al. 2020

International Conference on Electromagnetism, Rock Magnetism and Magnetic Material (Ice-R3m) 2019

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Thermal expansion coefficient prediction of fuel-cell seal materials from silica sand

Cited by 8 publications

References 5 publications

Use of Natural Silica Sand as a Component for Prospective Fuel Cell Sealing Materials

Use of Natural Silica Sand as a Component for Prospective Fuel Cell Sealing Materials

Natural Silica Sand/Alumina Ceramic Composites: Promising Candidates for Fuel-Cell Sealants

Thermal cycling study of prospective fuel-cell sealants from silica-sand/alumina composites

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