Jurnal Metalurgi dan Material Indonesia https://materialmetalurgi.id/index.php/JMMI <p><strong>Jurnal Metalurgi dan Material Indonesia (JMMI)</strong> merupakan terbitan berkala makalah ilmiah mencakup keilmuan teknik metalurgi <em>(metallurgy)</em> dan teknik material (<em>materials science and engineering</em>). Topik-topik pilihan yang termasuk dalam lingkup JMMI antara lain adalah sebagai berikut.</p> <ol> <li class="show">Rekayasa struktur dan sifat material</li> <li class="show">Rekayasa proses metalurgi</li> <li class="show">Pengembangan metode karakterisasi material</li> <li class="show">Pemodelan dan simulasi dalam rekayasa metalurgi dan material</li> <li class="show">Pendidikan keilmuan metalurgi dan material</li> </ol> <p>JMMI diterbitkan oleh <strong>Badan Kerja Sama Pendidikan Metalurgi dan Material Indonesia (BKPMM</strong>) per <em>catur wulan</em> yaitu pada bulan akhir April, Agustus, dan Desember. BKPMM merupakan perkumpulan para pengajar/dosen dari program studi atau jurusan yang mengajarkan keilmuan Teknik Metalurgi dan/atau Teknik Material. Hingga tahun 2017, anggota BKPMM berasal dari:</p> <ol> <li class="show">Departemen Teknik Metalurgi dan Material, Universitas Indonesia (UI), Depok</li> <li class="show">Program Studi Teknik Material, Institut Teknologi Bandung (ITB), Bandung</li> <li class="show">Program Studi Teknik Metalurgi, Institut Teknologi Bandung (ITB), Bandung</li> <li class="show">Program Studi Teknik Material dan Metalurgi, Institut Sepuluh November (ITS), Surabaya</li> <li class="show">Jurusan Teknik Metalurgi, Universitas Sultan Ageng Tirtayasa (UNTIRTA), Cilegon</li> <li class="show">Program Studi Teknik Metalurgi, Universitas Jenderal Achmad Yani (UNJANI), Bandung</li> <li class="show">Program Studi Teknik Mesin, Universitas Diponegoro (UNDIP), Semarang</li> <li class="show">Program Studi Teknik Mesin, Universitas Gadjah Mada (UGM), Yogyakarta</li> <li class="show">Program Studi Teknik Mesin, Universitas Sebelas Maret (UNS), Surakarta</li> <li class="show">Politeknik Manufaktur (POLMAN), Bandung</li> <li class="show">Program Studi Teknik Mesin, Universitas Andalas (UNAND), Padang</li> <li class="show">Program Studi teknik Mesin, Universitas Syiah Kuala (UNSYIAH), Aceh</li> </ol> en-US metalurgimaterial.id@gmail.com (Arif Basuki) metalurgimaterial.id@gmail.com (Untung Ari Wibowo, MT) Tue, 30 Apr 2019 00:00:00 +0700 OJS 3.1.2.1 http://blogs.law.harvard.edu/tech/rss 60 Pengaruh Temperatur Proses Curing Terhadap Sifat Thermal Komposit Epoksi Berpengisi Nanopartikel Sn-3.5Ag https://materialmetalurgi.id/index.php/JMMI/article/view/19 <p>Electrically Conductive Adhesive (ECA) is an alternative solder substitute that does not contain Pb. In this research, we made nanocomposite from epoxy resin as matrix and Sn-3.5Ag nanoparticle as filler to determine the nanocomposite thermal properties for ECA applications. We used curing process temperature variations of 30, 65 and 95 <sup>o</sup>C with sonication for 30 minutes. Differential Scanning Calorimetry (DSC) analysis showed an increase of glass transition temperature (T<sub>g</sub>) and degradation temperature (T<sub>d</sub>), decreasing curing temperature (T<sub>curing</sub>) as the curing process temperature increased while the melting temperature (T<sub>m</sub>) and crystallization temperature (T<sub>c</sub>) tend to be constant. T<sub>g</sub> for curing process 30, 65 and 95 <sup>o</sup>C was 35.58; 37.41 and 43.77 <sup>o</sup>C respectively. T<sub>d</sub> for curing process 30, 65 and 95 <sup>o</sup>C was 335.01; 337.50 and 342.49 <sup>o</sup>C. T<sub>curing</sub> in the curing process 30 and 65 <sup>o</sup>C was 179.95 and 176.08 <sup>o</sup>C. Thermogravimetric Analysis (TGA) showed that nanocomposite T<sub>d</sub> between 330-340 <sup>o</sup>C.</p> Tri Partuti, Yanyan Dwiyanti, Adhitya Trenggono, Fuji Utari Copyright (c) 2019 Tri Partuti, Yanyan Dwiyanti, Adhitya Trenggono, Fuji Utari http://creativecommons.org/licenses/by-nc-nd/4.0 https://materialmetalurgi.id/index.php/JMMI/article/view/19 Tue, 30 Apr 2019 00:00:00 +0700 Analisa Kegagalan Prematur pada Aeration Lance Catalyst Cooler di Industri Penyulingan Minyak https://materialmetalurgi.id/index.php/JMMI/article/view/15 <p>Aeration lance pada catalyst cooler merupakan bagian dari kilang RFCC yang berfungsi untuk mencegah terjadinya endapan katalis, mekanisme kerjanya adalah dengan mengalirkan udara kering bertekanan ke bagian bawah chamber. Kegagalan pada aeration lance akan berdampak terhadap reliability, availability, serta safety dari peralatan secara keseluruhan, yang berujung pada kerugian finansial. Oleh sebab itu, investigasi perlu dilakukan guna mengetahui akar penyebab kegagalan aeration lance, agar kegagalan serupa tidak terulang dikemudian hari. Investigasi yang dilakukan meliputi observasi lapangan, pengukuran dimensi, pengamatan visual, pengujian metalografi dengan OM dan SEM, serta analisa komposisi kimia. Hasil proses investigasi menyimpulkan bahwa akar penyebab kegagalan pada aeration lance adalah akibat hadirnya cacat lasan berupa incomplete penetration. Selain itu, tegangan tarik juga diduga hadir pada saat konstruksi komponen tersebut sehingga menyebabkan terjadinya kegagalan prematur.</p> Moch Ardi Dimastiar, Ahmad Taufik, Anne Zulfia Syahrial Copyright (c) 2019 Moch Ardi Dimastiar, Ahmad Taufik, Anne Zulfia Syahrial http://creativecommons.org/licenses/by-nc-nd/4.0 https://materialmetalurgi.id/index.php/JMMI/article/view/15 Tue, 30 Apr 2019 00:00:00 +0700 Pengaruh Penambahan Inhibitor Organik dari Ekstrak Batang Tahongai (Kleinhovia hospita Linn) terhadap Korosi Baja API 5L https://materialmetalurgi.id/index.php/JMMI/article/view/37 <p>This research will study about concentration and immersion time effect of corrosion rate inhibition by using Tahongai (<em>Kleinhovia hospita</em> <em>Linn</em>.) stem extract in a 3.5% NaCl environment. Tests conducted in this research were: the test of Fourier Transform Infrared (FTIR) Spectroscopy to know the functional groups and the compounds contained in the Tahongai (<em>Kleinhovia hospita Linn</em>.) stem and allegedly contains flavonoids from the obtained functional group, Open Circuit Potential (OCP) test to obtain the corrosion data and the lowest corrosion rate which is 6.29x10<sup>-4</sup> mm/year obtained on the samples with the addition of 400 ppm 30 day immersion. Efficiency maximum inhibitor obtained on samples with the addition of an inhibitor of 400 ppm 30 day immersion is 88.9336%.</p> Triana Yunita, Rizky Yoel, Asih Wentika Putri Kusuma, Sulistijono Sulistijono Copyright (c) 2019 Triana Yunita, Rizky Yoel, Asih Wentika Putri Kusuma, Sulistijono Sulistijono http://creativecommons.org/licenses/by-nc-nd/4.0 https://materialmetalurgi.id/index.php/JMMI/article/view/37 Tue, 30 Apr 2019 00:00:00 +0700 Pengaruh Kadar Resin Terhadap Sifat Fisik dan Kekuatan Tekan Inti Komposit Sandwich Tenunan 3D Serat Gelas – Poliester https://materialmetalurgi.id/index.php/JMMI/article/view/31 <p><em>Sandwich composite is made of light and thick core in between two thin skins that has high mechanical properties. This material is famous for application that needs high specific bending strength for example in lightweight panel for wall or floor for lightweight vehicles. Sandwich composite which made by using woven 3D fiber fabric has the highest resistance delamination resistance among other sandwich material. But, core compression strength of this type of sandwich composite is lower compared to honeycomb or balsa sandwich. Composite polymer properties are determined by resin content. In this research, the effect of resin content to compressive strength and physical properties of sandwich composite 3D woven fabric glass fiber – polyester is studied. Sandwich composite is made by hand lay-up method with resin content variation. Physical properties that are evaluated are thickness, density, and fiber volume fraction. Compression strength is determined by using compression strength that follow s ASTM C-365. Impregnation and core construction quality is evaluated by visual and stereo microscope technique. Sandwich composite 3D woven fabric successfully made with good impregnation quality at weigh ratio of fiber : resin 1 : 1, 1 ; 1,1, and&nbsp; 1 : 1,5 with average&nbsp; thickness of 5,49 mm. The increase of resin results in increase of density and core compressive strength of composite sandwich woven 3D fabric. The increase of core compressive strength is caused by forming of polyester network in the column of the composite core.</em></p> Hermawan Judawisastra, Handy Budiman, Dodi Ihsan Taufiq Copyright (c) 2019 Hermawan Judawisastra, Handy Budiman, Dodi Ihsan Taufiq http://creativecommons.org/licenses/by-nc-nd/4.0 https://materialmetalurgi.id/index.php/JMMI/article/view/31 Tue, 30 Apr 2019 00:00:00 +0700 Pengaruh Penambahan CuO Sebagai Sintering Aid pada Elektrolit Padat Neodymium Doped Ceria (NDC) https://materialmetalurgi.id/index.php/JMMI/article/view/30 <p><em>In this research, NDC powder with a chemical formula of </em><em>Ce<sub>0,75</sub>Nd<sub>0,25</sub>O<sub>1,875 </sub>added with 0, 0,5, 1, ad 1,5 wt% CuO is synthesized. Powder is mixed by stirring at an ethanol medium. Mixed powder is compacted to form a pellet and then sintered at 1000<sup>o</sup>C, 1200<sup>o</sup>C, and 1400<sup>o</sup>C for 4 hours. Sintering time variation of 2, 3, and 4 hours is also performed at 1200<sup>o</sup>C. Result shows that the highest relative density of 65,21% is achieved by 0,5wt% CuO addition sintered at 1200<sup>o</sup>C for 4 hours. Without CuO addition, pellet shrink through grain boundary diffusion and with CuO addition, liquid phase sintering occurs. Electrochemical impedance analysis shows that CuO lowers grain boundary resistance. The highest conductivity (1,52 x 10<sup>-2</sup> S/cm) at 700<sup>o</sup>C with an activation energy of 0,85 eV is achieved by pellet added with 0,5 wt% CuO.</em></p> Anindityo Anindityo Arifiadi, Syoni Soepriyanto Copyright (c) 2019 Anindityo Anindityo Arifiadi, Syoni Soepriyanto http://creativecommons.org/licenses/by-nc-nd/4.0 https://materialmetalurgi.id/index.php/JMMI/article/view/30 Tue, 30 Apr 2019 00:00:00 +0700 Pengembangan Teknologi Investment Casting Untuk Pembuatan Produk Cor Substitusi Impor Dengan Pemanfaatan Bahan Baku Lokal https://materialmetalurgi.id/index.php/JMMI/article/view/26 <p><em>The development of investment casting technology for the manufacture of import substitution cast</em><em>ing</em><em> products </em><em>by using </em><em>of local raw materials has been done. Compared to the conventional casting process, investment casting has the advantage of being able to create a complex cast</em><em>ing</em><em> product and produce a product that is </em><em>near net shape</em><em> so that it </em><em>is </em><em>no </em><em>need </em><em>machining</em><em> process</em><em>. The objective is as an effort to find an alternative method of making a quality cast</em><em>ing</em><em> product, has high added value with the utilization of local raw materials available in Indonesia so as to reduce the cost of production and dependence on imports of industrial raw materials </em><em>which </em><em>are very expensive in the investment casting process. The method of making cast</em><em>ing</em><em> products with investment casting process, including: </em><em>pattern making</em><em>, mo</em><em>u</em><em>ld making, </em><em>dewaxing, melting, </em><em>pouring, </em><em>finishing</em><em> and testing. Investment casting technology has been successfully applied to the manufacture of rocker arm, impeller </em><em>pump </em><em>and turbine blade with the utilization of local raw materials ie: epoxy resin as a substitute for metal pattern, </em><em>mixture wax of </em><em>paraffin and </em><em>celo </em><em>resin for </em><em>the pattern of </em><em>wax and zircon </em><em>sand of </em><em>Bangka as coating </em><em>slurry </em><em>for ceramic mo</em><em>u</em><em>ld. The discussion of this paper is expected to be a case of developing other cast</em><em>ing</em> <em>products needed by Indonesia for </em><em>industry: medical equipment</em><em>, agricultural </em><em>equipment</em><em>, textile</em><em> equipment</em><em>, </em><em>gun and small armaments, </em><em>electronics, automotive and electrical components </em><em>etc</em>.</p> Hafid Abdullah, Sri Bimo Pratomo Copyright (c) 2019 Hafid Abdullah, Sri Bimo Pratomo http://creativecommons.org/licenses/by-nc-nd/4.0 https://materialmetalurgi.id/index.php/JMMI/article/view/26 Tue, 30 Apr 2019 00:00:00 +0700 Kompatibilitas Sintering dan Fraksi Volume Terhadap Sifat Mekanik Komposit Hybrid https://materialmetalurgi.id/index.php/JMMI/article/view/36 <p><em>Composite is a combination of two or more of element materials to produce a characteristic that is better than the basic material.</em> <em>The use of two or more elements in the composition of composite materials (Hybrid composite) is expected to combine the properties of each element such as Aluminum which has good elasticity and zinc has good corrosion resistance, graphite has high hardness, and the use of magnesium which is a wettability on good of coupling agent so that the alloy can be used to combine a combination of superior properties in the form of high strength at room temperature, formability and high corrosion resistance.</em> <em>Powder metallurgical technology is very suitable to be applied for the use of more than two elements in the manufacturing of composite materials, because the compressibility of the powder is able to be combined with emphasis and heating, with the use of suitable temperatures. The pressure used is using 200-500 bar on press machine with variations of temperature were 400°C, 450°C and 500°C and variations in volume fraction:</em> <em>40% Al, 20% Zn, 30% C, 10% Mg: 35% Al, 25% Zn, 30% C, 10% Mg dan 30% Al 30%, Zn, 30% C, 10% Mg.</em> <em>The results of study obtained ideal temperature 400°C, because at this temperature, zinc does not melt, resulting in a bond between the combined elements. At temperatures above 400°C zinc melts and causes a decrease in the mechanical properties of the material. The temperature compatibility of sintering with volume fraction of 35% Al, 25% Zn, 30% C, 10% Mg is able to produce a solid phase in zinc as a matrix with aluminum, the product reaction from composite Al-Zn-C-Mg hybrids which are scattered Al<sub>12</sub>Mg<sub>17</sub> among composite formed phases resulting from powder metallurgy of technology</em></p> Agus Pramono, Adhitya Trenggono, Fatah Sulaiman Copyright (c) 2019 Agus Pramono, Adhitya Trenggono, Fatah Sulaiman http://creativecommons.org/licenses/by-nc-nd/4.0 https://materialmetalurgi.id/index.php/JMMI/article/view/36 Wed, 19 Jun 2019 10:40:11 +0700