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Manullang, Ria Julyana
Balai Besar Keramik

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Density and Magnetic Properties of Barium Ferrite from BaFe12O19 Nanoparticles Prepared by Microemulsion Method Kuncoro, Handoko Setyo; Sulistarihani, Naniek; Manullang, Ria Julyana; Astari, Ratih Resti
Jurnal Keramik dan Gelas Indonesia Vol 24, No 2 (2015): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

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Abstract

The density and magnetic properties of barium ferrite from BaFe12O19 Nanoparticles prepared by microemulsion method have been studied by comparing with the properties of micro-scaled BaFe12O19 prepared by metallurgical method. The preceding preparation consists of emulsification process, mixing, aging, centrifuging/separation, drying, grinding, and calcination at temperature of 900 oC, which brings on  the BaFe12O19 nanoparticles powder as its final product. Then, the obtained powders have been formed at compaction pressure of 200 Kg/cm2 and sintered at temperature of 1100 oC. The indications of formed BaFe12O19 nanoparticles have been confirmed via XRD and TEM testings which their dimension sizes are under 100 nm. Based on density measurements, the density of barium ferrite prepared by microemulsion method is higher than that of by metalurgical method (i.e. 5,3 gr/ml). While, the permagraph examinations have indicated that both remanence magnetic induction (2.49 kOe) and maximum energy product values (0.47 MGOe) of barium ferrite prepared by microemulsion method are higher about 1.22 and 1.47 times, respectively.
Statistical Method by ANOVA – The Effect of Waste Glass Activated Alkali Addition in Composite Cement Manullang, Ria Julyana; Samadhi, Walmiki
Jurnal Keramik dan Gelas Indonesia Vol 26, No 1 (2017): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

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Abstract

Analisis statistik dengan analisis varians (ANOVA) dilakukan untuk menentukan pengaruh penambahan limbah kaca teraktivasi alkali terhadap kuat tekan  mortar semen komposit. Semen komposit dibuat dengan mencampur klinker, gipsum dan limbah kaca. Percobaan dirancang  menggunakan rancangan statistik bertipe percobaan faktorial penuh dengan dua variasi percobaan berupa jenis alkali dan waktu kontak alkali dengan kaca. Nilai kuat tekan  mortar semen komposit setelah waktu pematangan  28 hari pada temperatur ruang dievaluasi dan dianalisis secara statistik. Berdasarkan ANOVA, kuat tekan semen dipengaruhi secara signifikan oleh efek utama dari variabel jenis alkali dan waktu kontak namun tidak dipengaruhi oleh efek interaksi antar dua variabel ini. Hasil uji kecukupan model ANOVA dengan analisis residu menunjukkan bahwa model hasil ANOVA dapat dinyatakan valid. Penggunaan kaca teraktivasi alkali dalam semen komposit menurunkan kekuatan tekan semen sebesar 20 - 40%. Kuat tekan semen yang dihasilkan dengan penambahan KOH lebih kecil sebesar 6 – 10% daripada kuat tekan semen yang dihasilkan dengan penambahan NaOH. Waktu kontak antara alkali dan kaca yang semakin lama akan mengakibatkan terbentuknya gel ASR yang bersifat ekspansif dan menurunkan kekuatan tekan semen.
Co-Authors Astari, Ratih Resti Kuncoro, Handoko Setyo Samadhi, Walmiki Sulistarihani, Naniek