%A 1117041029 Nindy Elyta Mawarty
%T KARAKTERISTIK KEKERASAN DAN STRUKTUR KRISTAL CORDIERITE BERBASIS SILIKA SEKAM PADI DENGAN PENAMBAHAN ALUMINA (0, 20, 25, DAN 30 WT%)
%X Telah dilakukan sintensis dan karakteristik struktur fasa dan kekerasan cordierite dengan penambahan alumina sebanyak 0, 20, 25, dan 30 wt%. Sintesis cordierite menggunakan bahan MgO dan Al2O3 berasal dari Sigma-Aldrich sedangkan bahan silika berasal dari sekam padi yang diekstraksi dengan metode alkalis menggunakan larutan KOH 5% dan HCl 10%. Sintesis cordierite dilakukan dengan metode padatan dan disintering pada suhu 1200 oC selama 3 jam. Pengujian kekerasan menggunakan alat Microhardness Tester dan untuk mengetahui struktur fasa menggunakan XRD (X-Ray Diffraction). Pada penelitian ini diperoleh nilai kekerasan sampel C0, C20, C25, dan C30 masing-masing adalah 50,03, 52,44, 35,69, dan 50,46 Kgf/mm2. Nilai kekerasan ini semakin meningkat seiring dengan penambahan alumina. Hasil XRD menunjukkan fasa yang terbentuk yaitu cordierite, corundum, spinel, kristobalit, dan periclase.

Kata Kunci: Cordierite, Silika Sekam Padi, Kekerasan, Struktur Fasa.




ABSTRACT

The synthesis, phase structure and hardness analysis of cordierite ceramic has been done with addition of alumina 0, 20,25, 30 wt%. Magnesium and alumina from Sigma-Aldrich have been used as raw material while the silica was obtained from the extraction of rice husk used 5% KOH and 10% HCl with alkalis method. This cordierite synthesis used solid-state method and sintered at 1200 oC for 3 hours. Hardness analysis was determined by Microhardness tester while the phase structure was determined by XRD (X-Ray Diffraction). Hardness value that obtained for C0, C20, C25, and C30 were 50.03, 52.44, 35.69, and 50.46 Kgf/mm2 repeatedly. It was proved that excess alumina will increase the hardness value. The XRD patterns revealed that cordierite, corundum, spinel cristoballite, and periclase were formed in the samples. 

Keyword: Cordierite, Rice Husk Silica, Hardness, Phase Structure.
%C FAKULTAS MATEMATIKA DAN ILMU PENGETAHUAN ALAM 
%D 2018
%I UNIVERSITAS LAMPUNG
%L eprints32050