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Articles 89 Documents

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Studi Sifat Elektronik Lapisan Nano Tunggal Sic 3c Dengan Metode Perhitungan Prinsip Pertama Muhammad Syaifun Nizar; Ayu Ratnasari
Jurnal Keramik dan Gelas Indonesia Vol 26, No 2 (2017): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Perkembangan teknologi saat ini membutuhkan semikonduktor dengan performa yang tinggi dan mengarah kepada fabrikasi transistor dengan ukuran proses node dibawah 14 nm. SiC 3C mempunyai potensi untuk dijadikan semikonduktor menggantikan semikonduktor berbasis silikon karena memiliki sifat tahan temperatur tinggi dan memikliki celah pita energi yang lebar. Sifat listrik bahan pada skala nano masih masih harus banyak penelitian yang perlu dilakukan supaya bisa dipakai sebagai bahan semikonduktor. Dengan menggunakan prinsip pertama, sifat listrik suatu bahan pada ukuran skala nano dapat diprediksi dengan simulasi komputasi, sifat elektronik lapisan tunggal nano SiC 3C dihitung density of state dan struktur pita energi. Hasil komputasi SiC 3C lapisan nano tunggal dengan ukuran 1,3 x 1,3 nm ukuran sel kristal 3x3x1 didapatkan celah pita energi sebesar -1.7 eV mirip dengan semikonduktor tipe p dengan pita konduksi minimum berada 8 eV diatas pita valensi.

Sintesis Precipitated Calcium Carbonated Dengan Asam Stearat Sebagai Pengubah Permukaan Citra Fitriani K; Dede Taufik; Kristanto Wahyudi; Hernawan Hernawan
Jurnal Keramik dan Gelas Indonesia Vol 26, No 2 (2017): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Jumlah permintaan material PCC yang mencapai 108,5 jutan ton pada tahun 2016 dan akan terus meningkat pada tahun-tahun berikutnya. Hampir semua industri membutuhkan material PCC baik sebagai filler maupun material utama seperti kertas, tekstil, karet, cat, ban, bahan adesif, farmasi, kosmetik, sealant, keramik, pasta gigi, makanan, plastik, deterjen, perekam magnetik, sistem transport obat-obatan dan sebagainya. oleh karena itu penelitian ini dilakukan untuk memanfaatkan sumber daya kapur alam Indonesia. Penelitian sintesis PCC ini menggunakan bahan baku dari Padalarang. Proses pembuatan PCC dilakukan dengan metoda karbonasi dan asam stearate sebagai pengubah. Hasil penelitian menunjukkan persen CaCO3 meningkat seiring dengan penambahan asam stearat dengan persen teritinggi 99,387 %. dalam bubur menentukan ukuran butir kapur yang dapat dicapai. Selain itu derajat putih (whiteness) dan derajat kecerahan (brightness) meningkat secara signifikan seiring dengan penambahan asam stearat, nilai yang tertinggi adalah whiteness 84,61 dan brightness 90,93 dengan konsentrasi asam stearat 2,5%.

Pembuatan dan Karakterisasi Material Cutting Tools Alumina Aditif Titania Maulid Purnawan; Soewanto Rahardjo; M. Sobron Lubis
Jurnal Keramik dan Gelas Indonesia Vol 26, No 2 (2017): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Pembuatan material cutting tools dari alumina aditif titania telah dilakukan. Aditif TiO2 dan TiC pada alumina berfungsi meningkatkan kekuatan mekanik. Komposisi material cutting tools keramik dibentuk dengan cara press dan dibakar pada 2 variasi suhu pembakaran yaitu 1600°C dan 1700°C. Pembakaran dilakukan dengan metode substitusi karbon yang bersumber dari sagar silikon karbida yang bertujuan mengubah TiO2 menjadi TiC. Berdasarkan hasil karakterisasi yang dilakukan, bahan dengan komposisi 97% Al2O3, 3% TiO2 yang dibakar pada suhu 1700°C mempunyai sifat yang lebih baik untuk dijadikan sebagai bahan cutting tools dengan kekerasan (vickers hardness) 25,21GPa.

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

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.

Ceramic Cutting Tools: Development, Characteristics and Prospects Maulid Purnawan
Jurnal Keramik dan Gelas Indonesia Vol 27, No 1 (2018): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Cutting tools in the machinery industry that work at high speeds around 100000-150000 rpm with feed rates above 100 m / min require special specifications namely hardness> 14.5 GPa, toughness> 4 MPa.m1 / 2 for turning inserts,> 8 MPa. m1 / 2 for drill, and> 15 MPa.m1 / 2 for tap and good wear resistance at high working temperatures.The specifications are filled with ceramic material which has a high melting point, high hardness, good chemical stability, high oxidation and corrosion resistance.In general, ceramic cutting tools are grouped into three types, namely alumina-based cutting tools, silicon nitride and cutting tools which are coated with ceramic material with a thickness of 4-15 μm.Commercially, ceramic cutting tools have been applied to the machinery industry in Indonesia, but their needs are still imported because there are no domestic ceramic cutting tools manufacturers. Therefore, the development of the ceramic cutting tool industry in Indonesia has good prospects.Development of the latest ceramic cutting tool products are cutting tools coated with AlTiN which have better thermal resistance and wear time compared to carbide compounds, cermet-based cutting tools capable of working at cutting speeds of 300-500 m / min and whisker reinforced ceramic cutting tools which fabricated in situ or carbon substitution.

Ceramic Magnetic Filter from Used Magnet and Limestone Powder for Drinking Water Source Management Handoko Setyo Kuncoro; Abdul Rahman
Jurnal Keramik dan Gelas Indonesia Vol 25, No 1 (2016): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Studi awal tentang pembuatan filter keramik terinduksi dari bahan magnet bekas dan serbuk kalsit untuk media pengolahan air telah dicoba menggunakan metoda induksi serbuk magnet. Filter magnetiknya disusun dalam wadah silinder dari bahan berdiameter 45 mm yang berisi serbuk batu gamping kalsit setebal 5 mm dan serbuk magnet barium ferit setebal 40 mm. Kedua lapisan bahan tersebut diinduksi magnet barium ferit berbentuk silinder dengan diameter dalam 50 mm, diameter luar 100 mm dan ketebalan 20 mm. Penerapan unjuk kerja dari filter magnetik terhadap uji kadar besi, jumlah coliform total dan jumlah bakteri E. Coli telah menunjukkan respon yang cukup baik sebagai filter air dalam menurunkan: kadar besi dalam air sekitar 0,35 kali (atau 0,13 mg/l), jumlah coliform total 0,17 kali (atau 6 per 100 ml) dan meniadakan jumlah bakteri E. Coli (mendekati 0 per 100 ml air dari sebelumnya berjumlah 11 per 100 ml). Hal ini mengindikasikan bahwa kualitas air keluaran telah memenuhi persyaratan Permenkes untuk sumber air minum (standar air baku) dan filter yang didesain telah berfungsi baik sebagai piranti penjernih air.

The Preparation Hydroxyapatite – Zirconia Composites as Bioceramic Materials Eneng Maryani; Sri Cicih Kurniasih; Naili Sofiyaningsih; Bayu Priyanto
Jurnal Keramik dan Gelas Indonesia Vol 27, No 1 (2018): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Hydroxyapatite (HAP) is a material often used as a bioceramic because of its special characteristics such as has the same mineral composition as the original bone and teeth, does not cause cytotoxic effects, biocompatible, bioactive and promote osteoconductivity. However HAP shows poor mechanical properties so it is less applicable to biological applications that must accept heavy loads. Therefore, it is necessary to modify the hydroxyapatite structure through the process of reinforcement (composite formation) with other materials such as zirconia (ZrO2). In this research, hydroxyapatite – zirconia composite prepared from each component made from local natural mineral. The compositions of prepared hydroxyapatite – zirconia composites are 75:25, 50:50, and 25:75. In all composite compositions prepared after calcination at 1000 oC, hydroxyapatite phase change into whitlockite and tetrahedral zirconia phase formed. Composite of HAP-ZrO2 =75:25 is the most suitable proportion because they still the highest hydroxyapatite content and all zirconia is in the tetrahedral phase

The Influence of Barium Ferrite and NdFeB Compositions on Magnetic Properties of The BaFe/NdFeB Composite Handoko Setyo Kuncoro; Ratih Resti Astari; Tita Oktavia Cahya Rahayu
Jurnal Keramik dan Gelas Indonesia Vol 25, No 1 (2016): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Studi tentang pengaruh komposisi bahan-bahan sumber (penyusun) terhadap sifat kemagnetan komposit magnet BaFe/NdFeB beserta sintesis barium ferit dan NdFeB yang dibantu binder PEG (polyethylene glycol) 6000. Keberhasilan sintesis bahan komposit tersebut bisa ditunjukkan dengan beberapa hasil pengujian seperti pengujian SEM, uji gores, dan pengujian DTA/TG. Morfologi dari komposit yang dibentuk dari bahan sumber (BaFe, NdFeB dan binder PEG) bisa teridentifikasi dengan baik oleh mikrograf SEM. Hasil uji gores menunjukkan bahwa penambahan binder PEG 6000 terbaik adalah 7,5% dari berat total. Sedangkan hasil uji DTA/TG memberikan data suhu degradasi termal komposit minimum (350°C) masih dibawah temperatur Curie bahan NdFeB. Hasil penelitian juga membuktikan bahwa komposisi bahan sumber komposit kurang berpengaruh terhadap sifat koersifitas magnetik tetapi lebih mempengaruhi terhadap sifat retentivitas magnet (induksi remanen) komposit BaFe/NdFeB. Tren pengaruh komposisi bahan penyusun terhadap sifat induksi remanen magnetik (Br) kompositnya mendekati formulasi untuk menghitung konduktivitas komposit.

Preparation and Characterization of Polyvinyl Alcohol-Nano Hidroxyapatite using Gamma Iradiation Technique for Biomaterial Yessy Warastuti; Dian Pribadi Perkasa; Erizal Erizal; Basril Abbas; Sudirman Sudirman
Jurnal Keramik dan Gelas Indonesia Vol 27, No 1 (2018): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

ABSTRACTThe development and use of biomaterials in the biomedical field as bone implants are becoming increasingly important. Synthesis of polyvinyl alcohol (PVA) – bionanohydroxyapatite (HAp) composite hydrogel has been carried using gamma irradiation technique. The PVA-HAp mixtures containing PVA (10-20%, w/v) and a single concentration of HAp (20%w) were irradiated with various irradiation doses (0-20 kGy). The physico-chemical properties of irradiated composites were observed,includingmechanical properties, water absorption, biodegradation test, and characterized using Fourier-transform Infared Spectroscopy(FTIR), Transmission Electron Microscope (TEM)and Scanning Electron Microscopy (SEM). The results showed that the optimum conditions wasPVA-HAp hydrogel composites (20%-20%, irradiation dose 20 kGy) with tensile strength 0.82 Mpa, elongation of 281.67%, water absorption of 103.18%, and biodegradation of 22.46%. The results of FTIR measurements of PVA-HAp composites showed the occurrence of crosslinking between PVA-HAp in the irradiation process. The SEM and TEM measurements showed that HAp powder was nano particle ( <60 mesh) and in the formed of fibers and with heterogen porousThe irradiated PVA-HA composite was expected to be as candidate for biomaterials application.

Preparation of Titanium Phosphate as Solid Electrolyte Material for Secondary Battery Handoko Setyo Kuncoro; Suhanda S; Muhammad Syaifun Nizar; Ratih Resti Astari; Didit Nur Rahman; Evvy Kartini; Bambang Prihandoko
Jurnal Keramik dan Gelas Indonesia Vol 27, No 1 (2018): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Industrialization of lithium batteries in Indonesia requires in addition to mineral technology as well as local raw material support. Solid electrolytes are one of the lithium battery cell components that determine the working stability (long life-time) of the battery and the safety of its use. In this study solid electrolyte for secondary battery with type of Lithium Aluminum Titanium Phosphate (LATP) was synthesized in variation of LATP.n% Li2O where Li2O functioned as conductivity enhancing additive with n=0,5,10. Theoretically, the largest LATP solid electrolyte content is the Titanium Phosphate (TiP) material about 80% by weight fraction, the material can be obtained from natural mineral materials such as ilmenite and apatite in Indonesia. It has qualified for the industrialization of battery components with domestic component level (TKDN) material exceeding 60%. The TiP material was prepared by sintering destruction and acid-base methods, while the LATP.n% Li2O was made using powder metallurgy and sintering method with pre-heating 400 ° C. The XRD test result shows a diffraction pattern of TiP similar to TiP pattern from other publication reference. A slight difference in the XRD pattern indicated an excess of TiO2 rutile content in TiP material and other impurities, which has also been proven by XRF test results. The SEM test result provided a micrograph showing off the crystal blocks corresponding to the shape described by other references. The LATP material made has a single and stable ionic conductivity mechanism based on the interpretation of the Cole-cole plot diagram. The result of ionic conductivity test for LATP.n% Li2O showed variation with n = 5 having conductivity (4.5x10-5 S / cm) higher than other variations.

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