<![CDATA[Keramik alumina merupakan salah satu material yang sangat penting dan strategis untuk beragam aplikasi seperti pada komponen otomotif, komponen elektronik dan komponen mekanik, bahan gerinding/abrasive dan sebagai bahan untuk pembuatan kiln furniture. Pada penelitian ini dilakukan proses sintering keramik alumina dengan menggunakan bahan aditif SiO. Pembuatan keramik alumina dilakukan melalui proses metalurgi serbuk, yaitu digunakan bahan baku serbuk gamma alumina dan sebagai bahan aditif sintering digunakan silika dari gelas kaca (SiO22 glass). Variabel penelitian yang digunakan ada dua macam, yaitu persentase penambahan aditif silika dengan variasi berat 1%, 5%, 7.5% dan 10% dan variasi suhu sintering 1100oC, 1200oC, 1300oC dan 1400oC. Sampel yang telah disintering selanjutnya dilakukan pengujian, antara lain uji densitas dan porositas, uji kuat tekan dan analisis XRD. Penambahan aditif dan variasi suhu sintering dapat memberikan pengaruh yang signifikan terhadap nilai densitas, porositas dan kuat tekan. Kondisi yang terbaik dari penelitian ini diperoleh pada sampel dengan aditif 10% SiO2 dan suhu sintering 1400oC. Pada kondisi ini dicapai nilai maksimum densitas 2.59 g/cm3, porositas minimal 10% dan kuat tekan tertinggi dicapai sebesar 234.60 MPa. Berdasarkan hasil analisis XRD terbentuk fasa dominan corundum (α-Al2O) dan fasa minor tydimit SiO, serta tidak terjadi reaksi antara alumina dengan aditif silika. Alumina ceramic is one of the most important and strategic materials for various applications such as automotive components, electronic components and mechanical components, grinding / abrasive materials, and as a material for making kiln furniture. In this study, the sintering process of alumina ceramics was carried out using SiO additives. The manufacture of alumina ceramics is carried out through a powder metallurgy process, which is used as raw material for gamma-alumina powder and as an additive for sintering used silica from glass (SiO2 glass). As a research variable, two types were used, namely the percentage addition of silica additives, namely with variations of 1%, 5%, 7.5%, and 10% by weight and variations in sintering temperature of 11002oC, 1200oC, 1300oC, and 1400C. The samples that have been sintered are then tested, including density and porosity test, mechanical strength test (compressive strength), and XRD analysis. The addition of additives and variations in sintering temperature can have a significant effect on the values of density, porosity, and compressive strength. The best conditions from this study were obtained in samples with 10% SiO additive and sintering temperature of 1400oC. In this condition the maximum density value is 2.59 g/cm2, the minimum porosity is 10% and the highest compressive strength is 234.60 MPa. Based on the results of XRD analysis, a dominant phase of corundum (α-Al2O3) and a minor phase of tydimite SiOwas formed, and there was no reaction between alumina and silica additive.]]>
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