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 1150C 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.
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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, 2.5105 cm electrical resistivity, 2.8 GPa Vickers
microhardness, and 10.310-6 °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 > TL Motor vehicles. Aeronautics. Astronautics > TL240.5 Composite materials |
| Divisions: | Faculty of Mathematics and Science > Physics > 45101-(S2) Master Thesis |
| Depositing User: | - Taufiq Rahmanu |
| Date Deposited: | 07 May 2019 01:45 |
| Last Modified: | 07 May 2019 01:45 |
| URI: | http://repository.its.ac.id/id/eprint/62929 |
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