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INDONESIA
Jurnal Keramik dan Gelas Indonesia
Published by Balai Besar Keramik
ISSN : 08545405     EISSN : 26228114     DOI : https://doi.org/10.32537/jkgi
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Materials Science & Nanotechnology
The JKGI contains papers of original research that provide or lead to fundamental principles in the science of ceramics, functional ceramics and ceramic-based composites. These articles include reports of the discovery of new phases, phase relationships, processing approaches and microstructures that relate to ceramic materials and processes. The articles establish the links between processing, structure characterization and properties of ceramics, including modeling approaches that are founded on basic mechanisms. All the published papers must be of enduring value and relevant to the field of ceramics.
Arjuna Subject : Ilmu Material (semua kategori) - Keramik dan Komposit
Articles 5 Documents
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Search results for , issue "Vol 26, No 1 (2017): Jurnal Keramik dan Gelas Indonesia" : 5 Documents clear
Orientation formation of the fire cement mineral phase from Dolomite-Alumina compositions Abdul Rachman; Suhanda Suhanda; Muhammad Syaifun Nizar
Jurnal Keramik dan Gelas Indonesia Vol 26, No 1 (2017): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v26i1.3916

Abstract

The formation of the mineral phase of fine cement type mixture of calcium aluminate and magnesium aluminate has been made of a mixture of fine dolomite and alumina materials. The composition defined by cross system comparisons (75, 50, 25 : 25, 50, 75) % with the conditions and constant firing temperature 1200oC. Characterization of the test sample fired product include XRD, chemical analysis, and physical analysis, which showed the formation of the main mineral phases of calcium aluminate, magnesium aluminate and free alumina. The type and level of calcium aluminate phase stability of the composition is varied than magnesium aluminate phase; among the others forming grossit (CaAl4O7) for Al2O3 content of excess (code C) and Ca3Al2O6 for excess CaO constant (code A). Physical properties of the two types of cement fine in succession, the density are 2,0 and 2,5 gr/cm3, the porosity are 24,42 and 52,23 %, pH 10 and 8, the compression strength are 150 and 160 / 2 cm diameter of test pieces. The selected composition (C) is the best of the cement product made of dolomit -alumina. The purpose of the orientation of fire cement mineral phase formation, is to give direction forming system fire cement mixture CA / MA of dolomit alumina in the system (CaO-MgO-Al2O3) is controlled minerology and physics.
Study of Technoeconomic Synthetic Bone Ash Production Abdul Rachman; Kristanto Wahyudi
Jurnal Keramik dan Gelas Indonesia Vol 26, No 1 (2017): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v26i1.3918

Abstract

Balai Besar Keramik has succeeded in producing synthetic bone ash from natural limestone and phosphoric acid. Characteristic of synthetic bone ash has a purity of  ≥  98%, white degree (brightness 90.59 and whiteness 89,42), ratio of Ca / P 1,64. Synthetic Bone ash is not inferior to bone ash from bovine bone combustion so it can be used as an alternative raw material for bone china ceramic body. The technoeconomic studies have been analyzed with assumption for the production capacity of 30 tons per month of synthetic bone ash, 5 years investment age will require initial investment cost of Rp. 3,667,083,700, - and total production cost per year is Rp. 4.059.279.000, -. With the selling price of synthetic bone ash products Rp.16.000, - / kg, will get the value of NPV in the 5th year of Rp. 557.517.242,27, -, IRR of 18.36%,  BCR of 1,135, BEP units: 982,774 kg, BEP sales: Rp. 15,724,389,020, - and Payback Period is 3.08 years. The results indicate that bone ash production is feasible according to financial criteria.
Characterization of Magnetic and Density Properties on Barium Ferrite with MnO2 Addition Ratih Resti Astari; Handoko Setyo Kuncoro; Didit Nur Rahman; Toni Kristiantoro
Jurnal Keramik dan Gelas Indonesia Vol 26, No 1 (2017): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v26i1.3912

Abstract

The addition of MnO2 in synthesis of barium ferrite magnet were prepared by powder metallurgy method with variation formula of MnO2 0%, 0.1%, 0.2%, 0.3%, 0.5% and 1% sintered at 1175 ºC. Material characterization includes X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM) and permagraph were employed to investigate the effect of MnO2 addition to magnetic properties and sample density. Hysteresis curve using permagraph showed that the addition of MnO2 have an effect on the increasing of magnetic properties and density. Remanence induction (Br), coercivity (Hc) and density (ρ) reached the maximum value of 1.36 kG, 2.757 kOe and 4.29 g/cm3  respectively  on different formula MnO2. The best value of MnO2 addition could be concluded on the addition MnO2 of 0.3% with Br = 1.36 kG, Hc = 2.683 kOe, and ρ = 4.29 g/cm3. The XRD results showed the formed of barium ferrite phase in the sintered sample at 1175ºC. While the SEM result revealed that the addition of MnO2 affected the density of barium ferrite particles.
Statistical Method by ANOVA – The Effect of Waste Glass Activated Alkali Addition in Composite Cement Ria Julyana Manullang; Walmiki Samadhi
Jurnal Keramik dan Gelas Indonesia Vol 26, No 1 (2017): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v26i1.3913

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.
Encapsulation of Fe3O4 with amina modified silica Robby Roswanda; Didin Mujahidin
Jurnal Keramik dan Gelas Indonesia Vol 26, No 1 (2017): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v26i1.3915

Abstract

Superparamagnet iron oxide Fe3O4 particles were encapsulated with amina modified silica via Stober Method. The particles generated were rod-like whose length was c.a. 2 µm and the thickness of silica shell was c.a. 75 nm. Magnetization measurements show that the silica shell does not disrupt the superparamagnetic property of Fe3O4. The amine group on the encapsulated particles was confirmed by attaching FITC (Fluorescein isothiocyanate) dye and checked under fluorescence microscope. The encapsulated particle is useful to be modified further for various applications that need magnetic field control.

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