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Search results for , issue "Vol 27, No 1 (2018): Jurnal Keramik dan Gelas Indonesia" : 5 Documents clear

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.

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

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.

The Influence of NdFeB Particle Sizes on Density and Magnetic Properties of Hybrid Composite Magnet BaO.6(Fe2O3)/NdFeB Tita Oktavia Cahya Rahayu; Handoko Setyo Kuncoro; Tony Kristiantoro
Jurnal Keramik dan Gelas Indonesia Vol 27, No 1 (2018): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Telah dilaksanakan studi tentang pengaruh ukuran butiran NdFeB pada sifat densitas dan kemagnetan bahan magnet komposit hybrid BaO.6(Fe2O3)/NdFeB. Kegiatan penelitian ini meliputi: proses sintesis bahan magnet komposit dalam matrik PVA, pengujian densitas bulk dan karakterisasi kurva hysteresis magnetisasi serta analisis hasil pengolahan data penelitian. Perbandingan komposisi massa BaO.6(Fe2O3):NdFeB ditentukan 1:1. Adapun variasi penelitian diambil dari ukuran butiran NdFeB yang diperoleh berdasarkan standar mesh ayakan 60 (mewakili ukuran 250µm), 230 (63µm), 325 (44µm) dan 400 (37µm) yang mana ukuran butiran BaFe dibuat tetap pada mesh ayakan 325 (44µm). Keempat sampel variasi ini diberi label mesh 60, mesh 230, mesh 325, dan mesh 400. Hasil pengujian densitas bulk menunjukkan kepadatan terbaik untuk sampel mesh 60, hasil ini diikuti secara kuadratik oleh remanensi magnetiknya. Pengamatan parameter kuat medan maksimum dalam kurva histeresis magnetisasi mengindikasikan estimasi temperatur Curie yang paling baik/tinggi untuk sampel mesh 60. Hasil pengujian nilai induksi remanen (Br) dan perhitungan total energi produk maksimum (BHmax) menguatkan bukti hipotesis bahwa sampel mesh 60 (ukuran butiran terbesar) memiliki sifat kemagnetan yang lebih baik dari sampel lainnya.

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