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All Journal Jurnal Teknik Mesin Rotasi Jurnal Pendidikan Teknologi dan Kejuruan Jurnal Sains Materi Indonesia Urania Jurnal Ilmiah Daur Bahan Bakar Nuklir Teknika: Jurnal Sains dan Teknologi Setrum : Sistem Kendali-Tenaga-elektronika-telekomunikasi-komputer ROTOR: JURNAL ILMIAH TEKNIK MESIN Jurnal Kimia dan Kemasan PROSIDING SEMINAR NASIONAL CENDEKIAWAN Indonesian Journal of Chemistry Metalurgi Jurnal Metalurgi dan Material Indonesia ADI Journal on Recent Innovation (AJRI) Teknomekanik JURNAL FLYWHEEL Makara Journal of Science Journal of Fibers and Polymer Composites Metalurgi

Anne Zulfia

1Departemen Metalurgi Dan Material, Fakultas Teknik Universitas Indonesia, Jakarta

Author-ID : 229495

Religion Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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PENGARUH WAKTU AGING TERHADAP KEKERASAN DAN STRUKTUR MIKRO KOMPOSIT Al-Si-Mg/Al2O3 DENGAN METODE STIR CASTING Junus, Salahuddin; Zulfia, Anne; Melisa, Melisa; Mariani, Lilis
ROTOR Vol 7, No 2 (2014)
Publisher : ROTOR

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (237.589 KB)

Aluminum composite needs proper aging period to achieve its optimum mechanical properties throughÂ precipitation hardening process. In this research, alumina (Al2O3) particulate reinforced aluminum alloy 6061 composite which is fabricated by stir casting method, undergoes T6 treatment in 175Â°C for 2 hours, 4 hours, 6 hours, and 8 hours. Mechanical properties evaluations such as tensile testing, hardness testing,Â and wear rate testing; also microstructure and SEM observation are conducted. Research shows that theÂ optimumÂ artificial aging period for the aluminum composite is 6 hours in 175Â°C. Wear rate decreases after T6 treatmentÂ applied. HardnessÂ increases after T6 treatment applied with aging period of 4 and 6 hours. Tensile strength decreases compared to as-cast composite dueÂ toÂ formationÂ ofÂ voidÂ atÂ interfaceÂ when T6 treatment conducted. Manufacturing factors will affect the mechanical properties of composite. Keywords: Aluminum composite, billet Al.6061, T6, aging period, stir casting

Characteristics of Vanadium Doped And Bamboo Activated Carbon Coated LiFePO4 And Its Performance For Lithium Ion Battery Cathode Sofyan, Nofrijon; Alfaruq, Subkhan; Zulfia, Anne; Subhan, Achmad
Jurnal Kimia dan Kemasan Vol. 40 No. 1 April 2018
Publisher : Balai Besar Kimia dan Kemasan

Vanadium doped and bamboo activated carbon coated lithium iron phosphate (LiFePO4) used for lithium ion battery cathode has been successfully prepared. Lithium iron phosphate was prepared through a wet chemical method followed by a hydrothermal process from the starting materials of LiOH, NH4H2PO4, and FeSO4.7H2O. The dopant variations of 0 wt.%, 3 wt.%, 5 wt.%, and 7 wt.% of vanadium and a fixed 3 wt.% of bamboo activated carbon were carried out via a solid-state reaction process each by using NH4VO3 as a source of vanadium and carbon pyrolyzed from bamboo tree, respectively. The characterization was carried out using X-ray Diffraction (XRD) for the phase formed and its crystal structure, Scanning Electron Microscope (SEM) for the surface morphology, Electrochemical Impedance Spectroscopy (EIS) for the conductivity, and battery analyzer for the performance of lithium ion battery cathode. The XRD results show that the phase formed has an olivine based structure with an orthorhombic space group. Morphology examination revealed that the particle agglomeration decreased with the increasing level of vanadium concentrations. Conductivity test showed that the impedance of solid electrolyte interface decreased with the increase of vanadium concentration indicated by increasing conductivity of 1.25 x 10-5 S/cm, 2.02 x 10-5 S/cm, 4.37 x 10-5 S/cm, and 5.69 x 10-5 S/cm, each for 0 wt.%, 3 wt.%, 5 wt.%, and 7 wt.% vanadium, respectively. Vanadium doping and bamboo activated carbon coating are promising candidate for improving lithium ion battery cathode as the initial charge and discharge capacity at 0.5C for LiFePO4/C at 7 wt.% vanadium is in the range of 8.0 mAh/g.

Studi Pelapisan Komposit Ni-P-Nano Al2O3 Dengan Metode Electroless Co-Deposition [Study of Ni-P-Nano Al2O3 Composite Coating With Electroless Co-Deposition Methode] Lestari, Yulinda; Mabruri, Effendi; Syahrial, Anne Zulfia
Metalurgi Vol 31, No 1 (2016): Metalurgi Vol. 31 No. 1 April 2016
Publisher : Pusat Penelitian Metalurgi dan Material - LIPI

The Ni-P-nano powder Al2O3 composite coating have been prepared by electroless codeposition method. It has advantage that the process does not require an electrode, fast deposition rate, good corrosion and wear resistance. In this study, the variable parameters are the addition of nano powder Al2O3 composition. The aim of this research is to determine microstructure phenomenon, phase and crystalinity, chemical composition and distribution on coating surface, and corrosivity Ni-P-nano powder Al2O3 composite coating.The substrate is used stainless steel 410. Substrates have been pre treated in order to activate the surface. Then, substrate immersed in solution that consisting of nickel sulfate, sodium hypophosphite, ammonium sulfate, sodium acetate, lead acetate and nano alumina powder. The substrate is immersed about 60 minutes at a 90±2 °C temperature with speed of 150 rpm. Sample characterization has done by SEM-EDS, XRD, and CMS. Results indicate there is a microstructure visual difference before and after electroless coating process.Based on variable experiment, the optimum nanopowder Al2O3 compositionis 10 gr/l which have given the best paticle distribution and most excellent corrosion resistance.AbstrakPelapisan material dengan komposit Ni-P-nano powder Al2O3 yang menggunakan metode electroless kodeposisi memiliki keunggulan yaitu prosesnya tidak membutuhkan elektroda, laju deposisi yang cepat danmemiliki ketahanan korosi dan ketahanan aus yang baik. Pada penelitian ini, parameter yang divariasikan adalah komposisi penambahan nano powder Al2O3. Penelitian ini bertujuan untuk mengetahui fenomena struktur mikro, fasa dan kristalinitas, komposisi kimia dan distribusi unsur di permukaan coating, danketahanan korosi komposit coating Ni-P-nano powder Al2O3. Substrat yang digunakan yaitu baja tahan karat 410 dilaku awal (pretreatment) untuk mengaktivasi permukaan, kemudian direndam dalam larutan yang terdiri dari nikel sulfat, natrium hypophosphite, ammonium sulfat, sodium asetat, lead asetat dan serbuk nano alumina. Substrat direndam selama 60 menit, dalam suhu proses 90±2 °C dengan kecepatan putaran 150 rpm. Karakterisasi sampel dilakukan menggunakan alat SEM-EDS (scanning electron microscopy-energy dispersive spectroscopy), XRD (x-ray diffraction), dan CMS (corrosion measurement system). Dari hasil percobaan menunjukkan terdapat perbedaan struktur mikro antara substrat logam dasar dan substrat setelahproses electroless coating. Berdasarkan variabel percobaan, untuk komposisi nano powder Al2O3 yang optimum adalah 10 gr/l karena memberikan distribusi partikel dan ketahanan korosi yang paling baik.

Simulasi Finite Element Method Pada Komposit Berbasis Aluminium Hasil Accumulative Roll Bonding (ARB) Dengan Penambahan Pressing (Tekanan) Pramono, Agus; Zulfia, Anne
ROTASI Vol 22, No 2 (2020): VOLUME 22, NOMOR 2, APRIL 2020
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.22.2.87-94

The technology of severe plastic deformation (SPD) consists of several types on processes, the most well-known on the processes are three types, namely; equal channel angular pressing (ECAP), high pressure torsion (HPT) and accumulative roll bonding (ARB). SPD technology was developing rapidly as metal and alloy processing. At present, the SPD has been used for the development of composite materials. To produce high mechanical properties in SPD requires a long pressure cycle. To analyze the accuracy of the process variables the temperature simulation, pressing and rolling pressures were performed, using the finite element method (FEM). The simulation was done by used of ANSYS 2019 R3 software type. The simulation traces the accuracy of the heating distribution due to thermal stress, pressing and rolling pressures, so that the ideal parameter values in the process are known. Simulation used ANSYS software. The temperature used in this simulation process is 377oC with a time of 2 hours. While the press pressure applied at 1700 N is equivalent to 0.173352 tons and the maximum rolling load capacity of 60 tons is equivalent to 588399 Newton.Â Teknologi severe plastic deformation (SPD) terdiri dari beberapa jenis proses, proses yang paling terkenal ada tiga jenis yaitu; equal channel angular pressing/ECAP, high pressure torsion/HPT dan accumulative roll bonding/ARB. Teknologi SPD berkembang pesat sebagai pemrosesan logam dan paduan. Saat ini SPD telah digunakan untuk pengembangan material komposit. Untuk menghasilkan sifat mekanik yang tinggi pada SPD diperlukan siklus tekanan yang panjang. Untuk menganalisis ketepatan varibel proses maka dilakukan simulasi tempreratur, tekanan pressing dan rolling, menggunakan finite element method (FEM). Simulasi dilakukan dengan menggunakan jenis software ANSYS 2019 R3. Simulasi menelusuri ketepatan distribusi pemanasan akibat tegangan thermal, tekanan pressing dan rolling, agar diketahui batasan nilai parameter yang ideal pada proses. Simulasi menggunakan software ANSYS. Temperatur yang digunakan pada proses simulasi ini adalah sebesar 377oC dengan waktu selama 2 jam. Sedangkan tekanan press diterapkan 1700 N setara dengan 0.173352 ton dan tekanan rolling kapasitas maksimum bebannya sebesar 60 ton setara dengan 588399 Newton.

STUDI PERLAKUAN PELARUTAN SERAT ALAM BATANG PALAS DURI TERHADAP UNJUK KERJA MEKANIS PADA MATERIAL KOMPOSIT Astana Widi, I Komang; Zulfia, Anne; Sujana, Wayan; Sibut
JURNAL FLYWHEEL Vol 4 No 2 (2011): Jurnal Flywheel
Publisher : Teknik Mesin S1 ITN Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36040/flywheel.v4i2.560

Penelitian material komposit ini untuk mamahami karakteristik serat batang palas duri dan matrik epoxy akan ditinjau dari segi sifat mekanisnya. Menghasilkan komposit polimer dengan penguat serat batang palas duri dengan sifat mekanis yang optimal, adapun variebel yang diteliti yaitu perlakuan kimia serat (memanfaatkan larutan kimia dengan Caustic soda (NaOH), Ethanol (CH3-CH2-OH), Acetone (CH3C=0-CH3) dan orientasi serat (kontinyu, pilin dan acak). Analisis makanis berupa pengujian tarik, impak dan bending. Hasil pengujiannya kekuatan tarik untuk serat kontinue dengan perlakuan kimia NaOH, sebesar 16.3333 (Mpa) sedangkan kekuatan impak dan bending terbesar pada orientasi serat pilin (0.0050 j/mm2 dan 34.9211 MPa) Dari data pengujian mekanis dapat diketahui bahwa kekuatan komposit dapat ditingkatkan dengan mengetahui arah pembebanan serat. Arah pembebanan terbesar diatur sesuai arah lamina serat (orientasi serat). Adanya beban geser yang lebih besar dengan arah lamina serat 40 derajat untuk penahanan beban. Fenomena ini juga ditunjukan pada data kekuatan bending.

Analisa Kegagalan Prematur pada Aeration Lance Catalyst Cooler di Industri Penyulingan Minyak Moch Ardi Dimastiar; Ahmad Taufik; Anne Zulfia Syahrial
Jurnal Metalurgi dan Material Indonesia Vol. 2 No. 1 (2019): April
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

Show Abstract | Download Original | Original Source | Check in Google Scholar

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.

EFFECTS OF Al2O3 NANOPARTICLES ADDITION ON HARDNESS AND THERMAL PROPERTIES OF Al-Zr-Ce/Al2O3 WITH 3 Wt-% Mg NANOCOMPOSITE PRODUCED BY STIR CASTING Rd. Panji Maulana; Kirman M.; Agus Sukarto W; Anne Zulfia
Jurnal Sains Materi Indonesia Vol 16, No 2: JANUARI 2015
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

EFFECTS OF Al2O3 NANOPARTICLES ADDITION ON HARDNESS AND THERMAL PROPERTIES OF Al-Zr-Ce/Al2O3 WITH 3 Wt-% Mg NANOCOMPOSITE PRODUCED BY STIR CASTING. Al-Zr-Ce alloy reinforced with Al2O3 nanoparticles with 3wt% Mg addition is proposed as one of the alternative material to replaceACSR as aluminum conductor. The composition of the nanocomposite consists of 0.12% Zr, 0.15% Ce, 3% Mg and 0.5-1.5 vf-% Al2O3. Fabrication of the nanocomposite is using stir casting method. Master alloy which consists of aluminum alloyed with Zr and Ce was manufactured. The master alloy was then melted and 3% Mg along with the reinforcement was blended inside the molten metal by stirring with rotational speed of 500 rpm at 850°C in an inert Ar gas environment. Chemical composition test confirmed the composition of alloying elements were close to the design except Ce, that could be related to limitation of OES and fading effect. The density of nanocomposite was decreased, while the porosity was increased with the addition of Al2O3. Nanocomposites’ hardness testing shows hardness increases with further addition of Al2O3, except the composite with 1.5 vf% of reinforcement that had lower hardness. Further addition of Al2O3 reinforcement to nanocomposite reduced its thermal expansion coefficient. SEM observation indicated that the Al2O3 nano particles were agglomerated and did not react to form interface layer. Nanocomposite 1.2 vf-% SEM observation shows that Ce inside of themicro structure did not segregate with Fe and Si, but seemed to react with Mg and Zr.

SINTESIS DAN KAJIAN PERILAKU KONDUKTIVITAS KOMPOSISI BARU ELEKTROLIT PADAT (Li2O)x(P2O5)y Heri Jodi; Anne Zulfia; Agus Sudjatno; Wahyudianingsih Wahyudianingsih; Evvy Kartini
Jurnal Sains Materi Indonesia Vol 19, No 1: OKTOBER 2017
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Bahan elektrolit padat (Li2O)x(P2O5)y dengan komposisi konten Li2O sebesar x = 24 %berat dan 28 %berat telah dipreparasi menggunakan teknik reaksi padat pada suhu di bawah suhu lelehnya. Paduan yang telah dipreparasi kemudian dikarakterisasi menggunakan Scanning Electron Microscopy (SEM) dan Electrochemical Impedance Spectroscopy (EIS) untuk diperiksa morfologi, sifat elektrokimia dan konduktivitasnya. Karakterisasi elektrokimia menunjukkan bahwa nilai konduktivitas kedua paduan berada pada orde 10-6S/cm, setara dengan nilai konduktivitas paduan Li4P2O7 yang dipreparasi pada suhu lebih tinggi dengan kandungan Li2O lebih banyak, dan lebih tinggi dari konduktivitas senyawa Li3PO4. Taksiran nilai eksponen frekuensi dari formula konduktivitas AC, memperlihatkan bahwa kemungkinan sumber konduksi ion dalam bahan yang diamati salah satunya adalah aliran ion jarak jauh. Kurva rugi dielektrik menunjukkan bahwa konduksi dalam bahan elektrolit ini didominasi oleh konduksi DC.

STUDI PENGARUH VARIASI SUHU PERLAKUAN PANAS TERHADAP STRUKTURMIKRO DAN KOROSIFITAS PADA PELAPISAN SS 410 MENGGUNAKAN KOMPOSIT Ni-P-NANO PARTIKEL Al2O3 Yulinda Lestari; Efendi Mabruri; Anne Zulfia Syahrial
Jurnal Sains Materi Indonesia Vol 18, No 3: APRIL 2017
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jsmi.2017.18.3.4114

Pelapisan material Stainless Steel 410 dengan komposit Ni-P-nano powder Al2O3 menggunakan metode electroless kodeposisi sangat tergantung pada tingkat penggabungan lapisan komposit tersebut antara matriks Ni-P dan penguat nano partikel Al2O3 Hal ini berpengaruh pada keunggulan sifat lapisan komposit seperti ketahanan korosi yang baik, laju deposisi yang cepat, keseragaman deposit yang dihasilkan dan ketahanan kimia yang baik. Pada penelitian ini, parameter yang divariasi adalah suhu perlakuan panas setelah proses electroless kodeposisi. Penelitian ini bertujuan untuk mengetahui fenomena strukturmikro, fasa dan kristalinitas, komposisi kimia dan distribusi unsur di permukaan coating, dan ketahanan korosi komposit coating Ni-P-nano partikel powder Al2O3. Substrat yang digunakan yaitu Stainless Steel 410 di-pretreatment untuk mengaktivasi permukaan, kemudian direndam dalam larutan yang terdiri dari nikel sulfat, natrium hypophosphite, ammonium sulfat, sodium asetat, lead asetat dan serbuk nano alumina. Substrat direndam selama 60 menit, dalam suhu proses 90±2 oC dengan kecepatan putaran 150 rpm. Karakterisasi sampel dilakukan menggunakan alat SEM-EDS, XRD, dan CMS. Dari hasil percobaan menunjukkan terdapat perbedaan visual permukaan substrat antara logam dasar, setelah proses electroless coating dan setelah perlakuan panas. Berdasarkan variabel percobaan, untuk suhu perlakuan panas yang optimum adalah 400 oC, dimana terbentuk strukturmikro dari nodular menjadi butiran yang lebih teratur dan merata serta memiliki ketahanan korosi yang paling baik.

SYNTHESIS OF EMPTY FRUIT BUNCHES CARBON POLYMER COMPOSITES AS GAS DIFFUSION LAYER FOR ELECTRODEMATERIALS Nanik Indayaningsih; Anne Zulfia; Dedi Priadi; Evvy Kartini
Jurnal Sains Materi Indonesia Vol 14, No 2: JANUARI 2013
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

SYNTHESIS OF EMPTY FRUIT BUNCHES CARBON POLYMER COMPOSITES AS GAS DIFFUSION LAYER FOR ELECTRODEMATERIALS. Empty Fruit Bunches (EFB) of oil palmhas been used, for example, for biofuels, automotive components, particle board, as a carbon source. Carbon material scan be widely used for many applications, for hydrogen storage, conductive or reinforcement plastics, catalyst supports, batteries and fuel cells. In this study, EFB carbon powder has been used as a raw material to make sheets of carbon-polymer composites. The composition of the composite sheet was varied, the electrical properties of the sheets were measured to determine the potential application as a Gas Diffusion Layer for Proton Exchange Membrane Fuel Cell (PEMFC) electrodes. Composites made with carbon composition weight % compared to the polymer are 65/35, 70/30, 75/25 and 80/20. The materials used is EFB carbon powder as a result of the pyrolysis temperature of 900 °C for 1 hour, then crushed and sieved to 200 mesh size, and the polymer was ethylene vinyl acetate. The rawmaterials are mixed in a solvent xylene, and printed using tape casting method, then dried at room temperature. The electrical properties were tested using a HIOKI 3522-50 LCR meter HiTESTER The measurement results show that the greater the ratio of carbon to polymer, the higher the electrical conductivity, the values are between 1.54 S/m-11.34 S/m.Morphology of the composite sheet was observed using Scanning Electron Microscope (SEM) to determine the distribution of carbon and polymer. According to the measurement of morphology and electrical conductivity, the composite is suitable for the gas diffusion layer of the PEMFC electrode.

Co-Authors Abdul Aziz Ammar Achmad Subhan Achmad Subhan Agus Pramono AGUS PURWANTO Agus Sudjatno Agus Sukarto Agus Sukarto W Ahmad Taufik Akhmad Herman Yuwono Alexey Glushshenkov Alfaruq, Subkhan Alfirano Alfirano Ali Alhamidi Angellinnov, Fiona Anistasia Milandia Apriliani, Enni Ari Uliana Arif Arif Astini, Vita Bambang Prihandoko Bambang Priyono Bambang Priyono Bambang Suharno Bintang Adjiantoro D.N. Haerani Darminto . Darminto . Dedi Supriadi Dwi Marta Nurjaya, Dwi Marta Eddy S Siradj Eddy S. Siradj Efendi Mabruri Effendi Mabruri Ekavianti Prajatelistia Evvy Kartini Evvy Kartini Evvy Kartini Evvy Kartini Evvy Kartini Evvy Kartini Fadli Robby, Fadli G.N. Anastasia Sahari Ghiska Ramahdita Hanuna Haritsah Hasriyanti Hasriyanti Heri Jodi Heri Jodi Heri Jodi, Heri I Komang Astana Widi I Nyoman Jujur Indra Gunawan Ismojo Ismojo Jarot Raharjo johansyah johansyah Johny Wahyuadi Soedarsono Juliadi Juliadi Jumari, Arif Kirman Kirman, Kirman Kirman M. Lestari, Yulinda Lilis Mariani Lilis Mariani, Lilis Luh Putu Ratna Sundari M. Zainuri Mabruri, Effendi Mario Marfelly, Mario Meirawati, Selvia Melisa Melisa Moch Ardi Dimastiar Mochamad Chalid Muhammad Wira Akira Muhammad Yunan Hasbi Myrna Ariati, Myrna Nanik Indayaningsih Nasution, Annio Indah Lestari Nengsih, Sulistia Nofrijon Sofyan, Nofrijon Nurul Huda Oktaviani, Adinda Priyo Sardjono Rahmadiawan, Dieter Ratna Juwita Razak, Muhammad Abdul Rd. Panji Maulana Sahari, G.N. Anastasia Salahuddin Junus Sibut Sotya Astutiningsih Subkhan Alfaruq Sudirman Sudirman Supardi Supardi Taufik Abimanyu Taufik Abimanyu, Taufik Verina Dalam Verina Dalam, Verina Wahid Muhamad Furkon Rahmatulloh, Wahid Muhamad Furkon Wahyudianingsih Wahyudianingsih Wara Dyah Pita Rengga Wayan Sujana Widyastuti . Widyastuti Widyastuti Yudha, Cornelius Satria Yudhistira Adityawardhana Yulinda Lestari Yustinus Purwamargapratala Zainuri, M

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