Digital Library: No conditions. Results ordered -Date Deposited. 2024-03-29T11:54:43ZEPrintshttp://digilib.unila.ac.id/images/sitelogo.pnghttp://digilib.unila.ac.id/2016-10-27T02:55:53Z2016-10-27T02:55:53Zhttp://digilib.unila.ac.id/id/eprint/24315This item is in the repository with the URL: http://digilib.unila.ac.id/id/eprint/243152016-10-27T02:55:53ZPENGARUH PENAMBAHAN MAGNESIUM OKSIDA (0, 20, 25, 30%)
TERHADAP KARAKTERISTIK KEKERASAN DAN STRUKTUR FASA
BAHAN KERAMIK CORDIERITE BERBASIS SILIKA SEKAM PADIABSTRAK
Telah dilakukan sintesis dan karakterisasi cordierite berbasis silika sekam padi
dengan penambahan magnesium oksida sebanyak 0, 20, 25 dan 30% (C0, C20, C25,
dan C30). Pembuatan cordierite menggunakan bahan MgO dan Al2O3 murni dan
silika dari sekam padi yang diekstraksi dengan metode sol-gel menggunakan
larutan NaOH 1,5% dan HNO3 10%. Metode yang digunakan adalah metode
reaksi padatan (Solid State Reaction) dan disintering pada suhu 1250°C dengan
waktu tahan selama 3 jam. Pengujian fisis yang dilakukan meliputi penyusutan,
densitas dan porositas, sedangkan analisis karakteristik struktur fasa menggunakan
XRD (X-Ray Diffraction) serta uji kekerasan menggunakan microhardness tester
dengan metode Vickers. Hasil uji struktur menunjukkan pada C0 terbentuk fasa
cordierite dan spinel, sedangkan C20, C25, dan C30 terbentuk spinel, forsterite, dan
periclase. Uji kekerasan menunjukkan seiring dengan penambahan MgO
kekerasan menurun karena menurunnya densitas dan naiknya porositas pada tiap
sampel.
Kata kunci : cordierite, MgO, silika sekam padi, reaksi solid state.
ABSTRACT
Synthesis and characterization of cordierite-based rice husk silica was done by
adding magnesium oxide as much as 0, 20, 25, and 30% (C0, C20, C25, and C30).
The cordierite was made of pure MgO and Al2O3 and the rice husk silica which
was extracted by using sol-gel method using NaOH 1,5% and HNO3 10 %
solution. The solid state reaction is used, and sample was sintered at 1250 oC with
holding time for 3 hours. Physical test included shrinkage, density, and porosity,
while characteristic analysis of phase structure was determined with XRD and
hardness test used microhardness tester with Vickers method. The result of
structure test showed that cordierite and spinel phase were formed on C0,
meanwhile forsterite, spinel, and periclase were formed on C20, C25, and C30.
Hardness test showed that along with the increase of the amount of MgO, the
hardness level decrease because of the decrease of density level and the increase
of porosity in each sample.
Key words: cordierite, MgO, rice husk silica, solid state reaction.
(1217041054) FRANSISKA MEILYANAfransiskameilyana@gmail.com