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Search results for , issue "Vol 28, No 1 (2019): Jurnal Keramik dan Gelas Indonesia" : 5 Documents clear

Electromagnetic Wave Absorbing Materials on Radar Frequency Range Yana Taryana; Azwar Manaf; Nanang Sudrajat; Yuyu Wahyu
Jurnal Keramik dan Gelas Indonesia Vol 28, No 1 (2019): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Radar absorbing material (RAM) is a material that which can absorb and reduce energy of electromagnetic wave. Recently, RAMs are widely used as an isolator to protect electromagnetic wave interference (EMI) caused by external electromagnetic field and electromagnetic waves generated by radio frequency (RF) components that disturb the performance of a radio system. Whilest, the most strategic function is as anti-radar coating material to supply the needs of military systems such as aircraft, combat ships and other equipments. Generally, RAM must be resistive, magnetic and dielectric. Absorption at the resonant frequency region is indicated by the permitability and permeability values of the material. The Most literature has reported that the basic material which has the potential to absorb electromagnetic waves is ferrite-based magnetic material, namely barium hexaferrite and strontium hexaferrite. Therefore, the current development of research leads to modification and engineering of the material structure so that it is expected to obtain the right parameters with a maximum absorption rate. Generally, RAMs construction design are grouped on the impedance matching and resonant absorber types.

Fabrication of Ceramic Alumina Tube by Extrusion Method Suzanne Agustin; Kristanto Wahyudi; Rizky Berliana Wijayanti; Maulid Purnawan
Jurnal Keramik dan Gelas Indonesia Vol 28, No 1 (2019): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Ceramic tubes are widely used as process equipment in various industries. One of the materials used as raw material for ceramic tubes is alumina. Materials are processed by vacuum extruder to obtain products with constant cross section. The characteristics of the products depend on the amount and chemical composition of the crystals formed. The formation of mullite as the main mineral will increase thermal shock resistance because mullite has a low expansion coefficient. Composition B with the percentage of 50% alumina, 30% kaolin, 10% clay and 10% MgO provide the best temperature shock resistance. The measurement result for flexural strength of composition B is 2400.52 kg / cm2

GEL CASTING METHOD FOR COMPLEX-SHAPED DENSE CERAMIC FABRICATION Ike Setyorini; Ria Julyana Manullang; Karlina Noordiningsih; Hernawan Hernawan
Jurnal Keramik dan Gelas Indonesia Vol 28, No 1 (2019): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

The fabrication of complex-shaped dense ceramic has been done by gel casting method. Alumina was used as raw material in this study. Alumina was mixed with methacrylamide (MAM) dispersant and Methylenebisacrylamide (MBAM) monomer with a certain ratio until the suspension has a good ability to flow. Ammonium persulphate (APS) as an initiator and Tetra-methylethylene diamine (TEMED) as catalyst were added to accelerate the polymerization reaction. The suspension was then poured into wax mold, stayed until harden and burned at 1300 oC. The results showed the minimum viscosity of suspension is obtained with 80% alumina content and addition of dispersant at 0.15% weight of alumina. The addition of APS and TEMED at 0.2% weight of monomer solution and the addition of PEG at 1 µl per gram alumina provided the best mechanical strength of green body at 61.29 kg/cm2 . Addition of PEG was used to overcome the problem of lamination due to oxidation reactions by air

The Effect Of Blue Methyl Concentration And Contact Time Toward Stain Resistance Tests On Sanytaryware Glaze Hendra Kustiawan; Muhammad Syaifun Nizar
Jurnal Keramik dan Gelas Indonesia Vol 28, No 1 (2019): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

The applications of sanitaryware glazed ceramics were exposed to a chemical substance that can leave a stain. One of the example are sanitaryware glaze which according to SNI 797:2018 must pass stain test to comply with the standard. On the SNI 797:2018 stain test procedure, one of the chemicals used are blue methyl with 0,5% concentration and 1 hour contact time. The purpose of this research is to investigate the effect of concentration and contact time duration on the stain resistance result test. Stain resistance test was carried out with methyl blue concentration 0,1-0,5% and contact time 1-24 hour on 540 samples and calculated with statistic which 461 (85.37%) samples pass stain test or unstained, and 79 (14.63%) samples failed stain test or stained. In the statistical calculation the concentration range of the dye is 0.1% -1.5% and the contact time of 1-24 hours is calculated as many as 400 samples. Concentration and contact time have a positive effect and significant on stain resistance test with a regression coefficient of 0,12% for stain color concentration and 0.92% for contact time. Based on the coefficient result, the effect of contact time is greater than the stain color concentration on the stain resistance test.

Effect of Solid Waste Fly Ash from Vegetable Oil Company in Production of Paving Block Alexius Luther Ola; Doly Prima Silaban
Jurnal Keramik dan Gelas Indonesia Vol 28, No 1 (2019): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Vegetable oil company produced large amount of fly ash as a solid waste. This waste has to be placed in a special space and this requirement causing problem for the vegetable oil company, such as decreasing of open space and aesthetics value of a place. This study has been aimed to know addition effect of fly ash on paving block quality. This research used variation of fly ash and coarse sand volume, while fine sand and Portland cement volume as a constant value. The result showed that fly ash can be used as filler material of paving block. Sample was analyzed using SNI 03- 0691-1996 procedure and showed highest value of compresisive strength on A1B2 treatment (22.34 Mpa), while the lowest was showed on A3B3 treatment (18.58 MPa). Water absorption values were ranged from 2.41% to 4.48%, and fulfill standart requirement. Based on test result paving block from A1B1, A1B2, A1B3,A2 B1, A2B2 and A2B3 treatment complied quality standart as B grade of paving block (used for parking yard), when A3B2 and A3B3 treatment complied quality standart as C grade of paving block (used for pedestrian base). The best treatment was A1B2 which consisted of (parts) 2 : 8 : 2 of fly ash, sand and Portland cement respectively, with compressive strength value 22.34 MPa and water absorption value 2.60%

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