Kestabilan Komposit Keramik Silika-Magnesia-Boria Terhadap Siklus Termal Sebagai Fuel Cell Sealing Material

Musyarofah, . (2015) Kestabilan Komposit Keramik Silika-Magnesia-Boria Terhadap Siklus Termal Sebagai Fuel Cell Sealing Material. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Persyaratan dasar sebuah sealing material adalah dapat menutup rapat (menyegel) komponen cell dan stabil selama operasi cell. Dalam penelitian ini disintesis sealing material, yaitu komposit keramik silika-magnesia-boria dengan bahan dasar pasir silika dari Tanah Laut, Kalimantan Selatan, yang telah diekstraksi dengan separasi magnetik dan perendaman HCl sehingga memiliki kemurnian tinggi. Komposit dengan komposisi SiO2, MgO, dan B2O3 70:10:20 dalam persen berat disintesis dengan metode solid state reaction. Campuran serbuk dikompaksi dan disinter pada temperatur 1150C dengan waktu penahanan 4 jam. Hasil pengujian menunjukkan komposit ini memiliki karakteristik sesuai dengan persyaratan sealing material, yaitu porositas 0,62 %, kekerasan 2,8 GPa, KET 10,3×10-6 C-1, dan resistivitas listrik 2,5×105 Ω cm. Perlakuan siklus termal pada temperatur 800 C selama 1 jam per siklus diberikan pada komposit untuk mengetahui kestabilannya. Hingga siklus kelima belas, komposit menunjukkan kestabilannya pada karakteristik komposisi fasa, porositas, kekerasan, koefisien ekspansi termal, resistivitas listrik, dan struktur mikrografi. ======================================================================================================================== There are two basic needs for a sealing material, it needs to seal the adjacent cell components and be stable over long-term operation. This work aimed to study stability of sealing material based on silica-magnesia-boria when applied with thermal cycle. Silica used, is based on purified natural silica sand from Tanah Laut by magnetic separation and immersion with HCl methods. The sealing material was 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 with 4 hours to produce a ceramic composite. The results show that the ceramic exhibited 0.62 % apparent porosity, 2.5105  cm electrical resistivity, 2.8 GPa Vickers microhardness, and 10.310-6 °C-1 thermal expansion coefficient of which are relatively appropriate for sealing function in fuel cell. Thermal cycle tests were performed on the composite to examine the stability. Till fifteen cycles, the composite show the stability on its phase composition, apparent porosity, hardness, thermal expansion coefficient, electrical resistivity, and microstructure.

Item Type: Thesis (Masters)
Additional Information: RTFi 620.14 Mus k
Uncontrolled Keywords: komposit sistem SiO2-MgO-B2O3, material penyegel fuel cell, kestabilan sifat fisis, siklus termal.
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ324.5 Fuel systems
Divisions: Faculty of Mathematics and Science > Physics > (S2) Master Theses
Depositing User: ansi aflacha
Date Deposited: 22 Mar 2018 07:20
Last Modified: 24 Aug 2018 03:52
URI: http://repository.its.ac.id/id/eprint/51611

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