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Agus Edy Pramono,Sidiq Ruswanto,Nanik Indayaningsih 한양대학교 세라믹연구소 2022 Journal of Ceramic Processing Research Vol.23 No.2
An investigation of engineered composites of kaolin and synthetic carbon has been conducted. The composite was developedfrom local kaolin materials from Singkawang, West Kalimantan, Indonesia, and synthetic carbon from organic coconut coirwaste. The study is intended to determine the electrical conductivity properties of these engineering materials. Density valuesdue to the increase in sintering temperature are relatively the same and stable at adjacent values. The increase in pyrolysissintering temperature does not change porosity significantly; porosity that occurs in carbon-ceramic composites at eachcomposition ratio tends to be stable at adjacent values. The higher the sintering temperature, the higher the electric currentthat can flow in carbon ceramics. The micro-features contained in the composite bulk show porosity and cracks, anddisconnection of connectivity between the filler carbon powder.
Properties of ceramic fabricated of synthetic carbon and organoclay based on carbon particle size
Agus Edy Pramono,R. Sugeng Mulyono,R. Grenny Sudarmawan,Muhammad Zaki Nura,Haolia Rahman,Nanik Indayaningsih 한양대학교 세라믹연구소 2020 Journal of Ceramic Processing Research Vol.21 No.4
The electrical and thermal conductivity properties of ceramics fabricated from carbon powder and clay have been studied. Thisstudy was designed by varying the particle size of carbon powders of mesh 150; 200; 250; 300; 350, with a carbon-organoclayratio of 30: 70% by weight, 200 bar compacting, and sintering of 950; 1000; 1050 °C. Electrical conductivity, thermalconductivity, specific wear rate, density/porosity, and ceramic morphology have been studied. The thermal conductivity followsthe tendency of electrical conductivity, because of the effect of carbon particle size. Increased sintering temperatures tend todecrease wear resistance. The smaller the particle size of carbon powder, it tends to increase the wear rate and the density ofcarbon-ceramic experiences relatively small changes. Porosity tends to follow density, even though the size of carbon particlesgets smaller. The occurrence of porous and cracking is more due to the irregular shape of carbon and matrix particles.
Properties of wear rate and electrical conductivity of carbon ceramic composites
Agus Edy Pramono,Muhammad Zaki Nura,Johny Wahyuadi M. Soedarsono,Nanik Indayaningsih 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.1
Morphology, electrical conductivity, specific wear rates, and densities of carbon ceramic composites as a result of thedistribution of organic coconut coir powder in the organoclay matrix, and sintering temperature variations had beeninvestigated and studied. The raw material of matrix was tested with XRF and XRD. The higher the content of coconut coirpowder and the pyrolysis sintering temperature, the higher the electrical conductivity of the composite, and the lower thecomposite wear rate. This fabricated carbon ceramic composite is unique, the content of coco fiber powder, which turns intocarbon, decreases the wear rate, increases electrical conductivity, and produces an increasingly lightweight ceramic carboncomposite.
Agus Edy Pramono,Muhammad Zaki Nura,Johny Wahyuadi M. Soedarsono,Nanik Indayaningsih 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.4
Experimental research on carbon ceramic composites fabricated from carbon and organoclay had been conducted. Electrical conductivity, specific wear rate, density and porosity, morphology, SEM EDX, and XRD were studied. The higher the content of carbon powder, the higher the electrical conductivity produced. Likewise, the higher the sintering temperature of composite increases the electrical conductivity of carbon ceramic composite. The higher the carbon powder content reduces the composite wear rate. Carbon content can increase the hardness of carbon ceramic composites. Composite density tends to be relatively stable with increasing sintering temperature. Increasing the content of carbon powder has shown to reduce composite density. The composite is getting lighter. The higher the carbon content in the composite increases the percentage of porosity of carbon ceramic composites, but it can still increase the electrical conductivity. Generally, carbon ceramic composites contain macroporous.
Agus Edy Pramono,Mochamad Bayu Taufik Firdaus,Windrayo Ratriomasyo,Muhammad Zaki Nura,Johny Wahyuadi M. Soedarsono 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.10
Carbon ceramic composites of local materials from coconut coir waste with clay matrix or organoclay have been successfully fabricated. The composites have successfully demonstrated the thermal and electrical conductive properties. The research variables are composition ratio of 1 : 10, 2 : 10, and 3 : 10% weight, and sintering temperature of 800 o C, 900 o C and 1000 o C. The higher the content of the coconut coir powder the higher the electrical conductivity the composite produces. Likewise, the higher the composite sintering temperature, the higher the electrical conductivity of the composite. The electrical conductivity value of the optimal carbon ceramic composite is produced by composites with a composition ratio of 1:30, at a sintering temperature of 900 o C. The higher the carbon contents, the lower the thermal conductivity of composite. Increased pyrolysis sintering temperatures do not increase the thermal conductivity of composites. The optimum value of thermal conductivity is generated by carbon ceramic composites at a pyrolytic sintering temperature of 900 o C, at a ratio of 1 : 10. In general, increasing sintering temperature does not change the composite density. Composite density tends to be constant to increase sintering temperature. Increasing the content of coconut coir powder, which turns into carbon, is shown to decrease composite density.
Fabrication of high purity silica precipitates from quartz sand toward photovoltaic application
Agus Budi Prasetyo,Murni Handayani,Eko Sulistiyono,F. Firdiyono,Eni Febriana,Wahyu Mayangsari,Sayekti Wahyuningsih,Edi Pramono,Ahmad Maksum,Rini Riastuti,Johny Wahyuadi Soedarsono 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.1
The development of renewable energy is becoming a crucial aspect because fossil fuels are non-renewable energy and will runout in the near future. Since Indonesia is in the equator area which gets sunshine throughout the year, solar cell is one of therenewable energy which is very promising as renewable energy. The obstacle to develop solar cell is the high cost of solar panel. Therefore, new technology to produce silica with high purity is important to be performed in order to be used as material inmaking solar panels. Here we fabricated high purity silica precipitates from quartz sands from Kendawangan, WestKalimantan. We fabricated silica precipitated by roasting quartz sand and then dissolving the sodium silicate into boilingwater followed by leaching, precipitation and repeatedly washing using hydrochloric acid. The content of SiO2 of atomicabsorption spectroscopy of quartz sand from Kendawangan contains SiO2 of 99.2% and the remaining trace elements areimpurities. The roasting process was conducted using sodium carbonate with the comparison of quartz sand: sodiumcarbonate = 55:45 (% ratio) at 1.200 °C for 2 hours obtaining sodium silicate crystal. The final result of silica precipitatesobtained in this research showed that the silica precipitates has very high purity with content of SiO2 up to 99.99%. Thissuccessful result will contribute for domestic industry which can provide high purity silica precipitates for material source ofsolar grade silicon in photovoltaic device.