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All Journal ASEAN Journal of Systems Engineering Rotasi Urania Jurnal Ilmiah Daur Bahan Bakar Nuklir Jurnal technoscientia Jurnal Teknologi Journal of Enviromental Engineering and Sustainable Technology ROTOR: JURNAL ILMIAH TEKNIK MESIN JURNAL TEKNOLOGI TECHNOSCIENTIA
M. Waziz Wildan
Jurusan Teknik Mesin Dan Industri, Universitas Gadjah Mada Jl. Grafika No. 2, 5528 Yogyakarta
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Pengaruh Parameter Faktor Stir Casting pada Porositas KOmposit Al-SiC Sadi, Sadi; Malau, Viktor; Wildan, M Waziz; Suyitno, Suyitno
ROTOR Vol 7, No 1 (2014)
Publisher : ROTOR

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (343.837 KB)

Abstract

This research aims to analyze the effect of stir casting factor parameters on  Al-SiC composite porosity using Taguchi method.   Composite materials used aluminum alloy   Al-Si as matrix and SiC particle (silicon carbide) sized -400 mesh as reinforcement.   Al-SiC composites specimen porosity was tested using  Archimedes  principles.  Experimental  design  using  L16  orthogonal  arrays  Taguchi method standard. Factors used  for  the experiment were SiC content, melt  temperature, rotation speed and stirring  time  duration,  each  using  4  variation.  Experimental  results  showed  that  increasing  SiC content parameters and stirring rotation speed from 100 into 300 rpm can increase Al-SiC composite oporosity,  but  increasing melt  temperature  above  700 C  and  stirring  time  from  10-30 minutes  candecrease the porosity. The most significant factor affecting Al-SiC composite porosity was SiC conten with 84,7 % contribution. Microstructures of Al-SiC casting composites were observed using scanning electron microscopy  (SEM). Keywords: Al-SiC composites, porosity,  stir casting, experimental design, taguchi method
THE EFFECT OF PH VARIATIONS ON MAGNETIC PROPERTIES OF MAGNETITE SYNTHESIZED FROM IRON SAND Wildan, Muhammad Waziz; Rusianto, Toto
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 7 No 2 Februari 2015
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (704.558 KB) | DOI: 10.34151/technoscientia.v7i2.209

Abstract

Magnetite has been successfully synthesized from iron sand using co-precipitation method with variations of pH levels. The iron sand was obtained from South Coast of Yogyakarta. The iron sand was separated using a permanent magnetic bar to obtain the magnetic mineral, which is used as raw material. The raw material was ball milled to reduce the particle size down to ≤ 74 mm. It was then dissolved and stirred in HCl 37% at 80 oC for 3 hours. The reaction yielded a solution consisting of FeCl2 and FeCl3, which is called as a master solution. Ammonium hydroxide (NH4OH) 20% was added to the master solution to obtain Fe-oxide precipitation. The precipitation process depended on the pH of the solution, so the pH of the solution was arranged using variations of NH4OH contents. The volume ratios of the master solution and NH4OH were A (2:1), B (1:1), C (1:2) and D (1:3), they were designated as samples A, B, C and D, respectively. Those various compositions yielded solutions with various pH levels, i.e. 5, 8, 10 and 11, respectively. The black powder precipitation was immediately formed during the reaction. The powders were analyzed using XRD. The magnetic properties were measured using vibrating sample magnetometer (VSM). TEM was used to observe the particle size. From the XRD, it was found that magnetite compound was found on the solution with pH level ≥ 8. Magnetic properties test show that Ms (saturation magnetization) is 43 emu/gr found on the solution with pH level of 8. TEM images show that the smallest particle size found on the solution B with pH level of 8. Magnetic Nanoparticles (MNPs) with superparamagnetic properties can be synthesized from iron sand.
ANALISIS PENGARUH KANDUNGAN SIC, TEMPERATUR CAIRAN, KECEPATAN PUTAR DAN DURASI WAKTU PENGADUKAN PADA KEKUATAN TARIK KOMPOSIT AL-SIC Sadi, Sadi; Wildan, M. Waziz; Suyitno, Suyitno
ROTASI Vol 16, No 1 (2014): VOLUME 16, NOMOR 1, JANUARI 2014
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (605.613 KB) | DOI: 10.14710/rotasi.16.1.7-13

Abstract

Tujuan penelitian ini adalah untuk menganalisis pengaruh kandungan SiC, temperatur cairan, kecepatan putar dan durasi waktu pengadukan pada kekuatan tarik komposit Al-SiC menggunakan metode Taguchi. Material komposit yang digunakan adalah aluminium paduan Al-Si sebagai matrik dan partikel SiC (silicon carbide) ukuran -400 mesh sebagai penguat. Spesimen komposit Al-SiC dibuat menggunakan proses stir casting. Kekuatan tarik spesimen komposit Al-SiC diuji menggunakan mesin uji tarik servopulser. Kandungan SiC, temperatur  cairan, kecepatan putar dan durasi waktu pengadukan, masing-masing menggunakan 4 variasi. Hasil eksperimen menunjukkan bahwa menaikkan kecepatan putar pengadukan sampai 300 rpm dan durasi waktu pengadukan sampai 30 menit mampu menaikkan kekuatan tarik komposit Al-SiC, tetapi menaikkan kandungan SiC di atas 5 % berat dan temperatur cairan di atas 680oC dapat menurunkan kekuatan tariknya. Kandungan SiC pengaruhnya paling besar pada kekuatan tarik komposit Al-SiC dengan kontribusi 68,86 %. Sruktur mikro coran komposit Al-SiC diamati menggunakan scanning electron microscope (SEM).
THE POTENTIAL OF IRON SAND FROM THE COAST SOUTH OF BANTUL YOGYAKARTA AS RAW CERAMIC MAGNET MATERIALS Rusianto, Toto; Wildan, M. Waziz; Abraha, Kamsul; Kusmono, Kusmono
Jurnal Teknologi Vol 5 No 1 (2012): Jurnal Teknologi
Publisher : Jurnal Teknologi, Fakultas Teknologi Industri, Institut Sains & Teknologi AKPRIND Yogyakarta

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Abstract

Magnet merupakan bahan teknik yang kebutuhannya meningkat seiring dengan meningkatnya perkembangan industri elektronika di Indonesia, akan tetapi kebutuhan magnet di Indonesia masih diimpor dari luar negeri. Sementara bahan baku magnet berupa besi oksida tersedia cukup banyak di Indonesia, salah satunya pasir besi di pantai Selatan Yogyakarta. Pasir besi mengandung sifat magnetik karena adanya mineral magnetite (Fe3O4) berwarna hitam, maghemite ( -Fe2O3), Rutil (FeTiO3), yang besifat magnetik. Mineral magnetit dapat dikembangkan menjadi bahan magnet contohnya untuk pita magnetik, magnet speaker, magnet motor listrik dan lain-lain. Pasir besi di pantai selatan Bantul Yogyakarta berwarna abu-abu kehitaman menunjukan adanya kandungan material magnetik dalam jumlah besar. Hasil pengujian dengan menggunakan magnet, rata-rata 66.32% berat menempel pada magnet, dari hasil tersebut dilakukan pemisahan dengan metode sieving persentase jumlah terbesar sebanyak 32% pada ukuran bukaan <+212 m. Pengujian dilakukan pada pasir yang menempel pada magnet dan hasil sieving pada jumlah terbesar. Hasil karakteristik material magnetik menggunakan Vibrating Sample Magnetometer (VSM), menunjukan saturation magnetisation (Ms) adalah 13,18 emu/gr dan 36,49 emu/gr, magnetik remanen (Mr) 4,15 emu/gr dan 7,95 emu/gr, koersivitas (Hc) 230 Oe dan 186 Oe, suseptibilitas massa ( ).1,45 ×10-4 m3/kg dan 4,31 ×10-4 m3/kg. Hasil uji XRD menunjukan dominasi magnetite dan maghemite pada pasir besi. Berdasarkan kajian tersebut, bahwa pasir pantai Selatan Bantul Yogyakarta merupakan material magnetik. Material mangetik yang terkandung pada pasir pantai memiliki potensi sebagai bahan keramik magnet (MO.xFe2O3).
THE EFFECT OF PH VARIATIONS ON MAGNETIC PROPERTIES OF MAGNETITE SYNTHESIZED FROM IRON SAND Wildan, Muhammad Waziz; Rusianto, Toto
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 7 No 2 Februari 2015
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v7i2.209

Abstract

Magnetite has been successfully synthesized from iron sand using co-precipitation method with variations of pH levels. The iron sand was obtained from South Coast of Yogyakarta. The iron sand was separated using a permanent magnetic bar to obtain the magnetic mineral, which is used as raw material. The raw material was ball milled to reduce the particle size down to ≤ 74 mm. It was then dissolved and stirred in HCl 37% at 80 oC for 3 hours. The reaction yielded a solution consisting of FeCl2 and FeCl3, which is called as a master solution. Ammonium hydroxide (NH4OH) 20% was added to the master solution to obtain Fe-oxide precipitation. The precipitation process depended on the pH of the solution, so the pH of the solution was arranged using variations of NH4OH contents. The volume ratios of the master solution and NH4OH were A (2:1), B (1:1), C (1:2) and D (1:3), they were designated as samples A, B, C and D, respectively. Those various compositions yielded solutions with various pH levels, i.e. 5, 8, 10 and 11, respectively. The black powder precipitation was immediately formed during the reaction. The powders were analyzed using XRD. The magnetic properties were measured using vibrating sample magnetometer (VSM). TEM was used to observe the particle size. From the XRD, it was found that magnetite compound was found on the solution with pH level ≥ 8. Magnetic properties test show that Ms (saturation magnetization) is 43 emu/gr found on the solution with pH level of 8. TEM images show that the smallest particle size found on the solution B with pH level of 8. Magnetic Nanoparticles (MNPs) with superparamagnetic properties can be synthesized from iron sand.
PRODUCTION OF URANIUM-MOLYBDENUM ALLOY AS A CANDIDATE FOR NUCLEAR RESEARCH REACTOR FUEL Ganisa Kurniati Suryaman; Muhammad Waziz Wildan; Supardjo Supardjo; Yatno Dwi Agus Susanto
Urania : Jurnal Ilmiah Daur Bahan Bakar Nuklir Vol 24, No 3 (2018): Oktober, 2018
Publisher : website

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/urania.2018.24.3.4685

Abstract

PRODUCTION OF URANIUM−MOLYBDENUM ALLOY AS A CANDIDATE FOR NUCLEAR RESEARCH REACTOR FUEL. Research and development on high density uranium for nuclear research reactor fuel is still in progress. Uranium-molybdenum alloy is one of the strongest candidates of nuclear research reactor fuel material. The properties and characteristics of U-Mo alloy is of important consideration for the selction of the fabrication techniques for the production of  the fuel. In this work, uranium-molybdenum (U-Mo) alloys with varied molybdenum content have been produced succesfully by arc melting technique. The molybdenum content variations were 7 %wt, 8 %wt, 9 %wt and 10 %wt Mo. The melting process was done 5 times to achieve homogenization. Metallographic micrograph shows the presence of dendritic structure. XRD examination result affirms the presence of 2 phases of γ-U phase and d-U2Mo phase. Microhardness Vickers test shows higher hardness value for Uranium-molybdenum alloy with higher molybdenum content.Keywords: U−Mo alloy, research reactor, fuel.
ANALISIS DISTRIBUSI KETEBALAN DAN KEKERASAN HASIL CORAN SENTRIFUGAL ALUMINIUM PADUAN (Al-Mg-Si) AKIBAT PERUBAHAN LAJU PUTARAN DAN KEMIRINGAN SUMBU CETAKAN Sugiarto Sugiarto; Tjuk Oerbandono; Jamasri Jamasri; M Waziz Wildan
Journal of Environmental Engineering and Sustainable Technology Vol 1, No 1 (2014)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (877.536 KB) | DOI: 10.21776/ub.jeest.2014.001.01.3

Abstract

Pengaruh gaya sentrifugal pada pengecoran sentrifugal adalah mampu menghasilkan coran yang lebih padat dan beberapa sifat yang unggul lainnya dibanding pengecoran konvensional. Tetapi  kelemahannya adalah distribusi ketebalan dan kepadatan coran cenderung tidak merata, segregasi dan struktur yang tidak homogen akibat laju pembekuan yang tidak seragam, permukaan bagian dalam yang kasar akibat udara yang terjebak dan sebagainya. Kekurangan ini mungkin dapat diatasi dengan mengatur beberapa parameter seperti laju putaran, sudut kemiringan cetakan, karakteristik material coran, temperatur cetakan atau dengan memberikan perlakuan terhadap logam cair selama pengecoran.Penelitian ini mencoba mengatur laju putaran dengan variasi 1050 rpm, 1400 rpm, 1950 rpm dan 2300 rpm. Dan kemiringan cetakan diatur dengan variasi sudut 15°, 30°, 45° dan 60°. Bahan penelitiannya adalah aluminium paduan (Al-Mg-Si) dengan berat tiap penuangan 900 gram, temperatur penuangan 900 ºC dan waktu penuangan 120 detik.Hasilnya adalah distribusi logam cair tidak merata pada putaran 1050 rpm untuk semua sudut dan 1400 rpm dengan sudut 45º dan 60º. Pada permukaan bagian dalam produk terdapat bagian yang kasar (terdapat cacat permukaan) di hampir semua variasi putaran dan sudut, kecuali pada putaran 1400 sudut 15º, 1950 rpm sudut 60º dan 2300 rpm sudut 45º dan 60º. Pada putaran 1950 rpm dan 2300 rpm, distribusi ketebalan relatif merata untuk semua variasi sudut, sedangkan distribusi ketebalan yang paling merata adalah pada putaran 1950 rpm dan 2300 rpm dengan sudut 45º. Secara umum kekerasan di daerah ujung/benda kerja lebih tinggi daripada pada daerah tengah. Pada putaran 2300 rpm  dihasilkan distribusi kekerasan yang merata dengan kekerasan rata-rata yang lebih tinggi dibanding yang dihasilkan pada putaran yang lebih rendah.
PREDICTION OF WELL BEHAVIOR USING WELL DELIVERABILITY ANALYSIS Dewi Asmorowati; M. Waziz Wildan; Khasani -
ASEAN Journal of Systems Engineering Vol 2, No 1 (2014): ASEAN Journal of Systems Engineering
Publisher : Master in Systems Engineering

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Abstract

In operating geothermal field, the thing to note is the sustainable production as well as problems that affect it. The problem that often occurs in the geothermal field is scale, corrosion and mechanical problems. One technique that can be used to predict the problems that occur around the bottom hole to the surface is using the well deliverability analysis method. Analysis is done by data and curve interpretation of deliverability curve based on Grant experiment. This study take data from several wells in two Geothermal Field in Indonesia. From the analysis, well A, D and F show production decline The deliverability curve of well A shows the production decline for about 60 – 85%, it is caused by moving of the flashing point, it shows from the increasing of dryness value from 7-14% in 1997 become 13-15% in 2010. The deliverability curve of well D shows the production decline for about 50%, it is caused by declining of reservoir pressure that can be seen from the decreasing  of feed zone pressure in 1997 is 27 bar and in 2010 is 20 bar. The deliverability curve of well F shows the production decline for about 29%, it is caused by moving  of the flashing point.
Pengaruh Parameter Faktor Stir Casting pada Porositas KOmposit Al-SiC Sadi Sadi; Viktor Malau; M Waziz Wildan; Suyitno Suyitno
ROTOR Vol 7 No 1 (2014)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (343.837 KB)

Abstract

This research aims to analyze the effect of stir casting factor parameters on  Al-SiC composite porosity using Taguchi method.   Composite materials used aluminum alloy   Al-Si as matrix and SiC particle (silicon carbide) sized -400 mesh as reinforcement.   Al-SiC composites specimen porosity was tested using  Archimedes  principles.  Experimental  design  using  L16  orthogonal  arrays  Taguchi method standard. Factors used  for  the experiment were SiC content, melt  temperature, rotation speed and stirring  time  duration,  each  using  4  variation.  Experimental  results  showed  that  increasing  SiC content parameters and stirring rotation speed from 100 into 300 rpm can increase Al-SiC composite oporosity,  but  increasing melt  temperature  above  700 C  and  stirring  time  from  10-30 minutes  candecrease the porosity. The most significant factor affecting Al-SiC composite porosity was SiC conten with 84,7 % contribution. Microstructures of Al-SiC casting composites were observed using scanning electron microscopy  (SEM). Keywords: Al-SiC composites, porosity,  stir casting, experimental design, taguchi method
Co-Authors . Suyitno Dewi Asmorowati Ganisa Kurniati Suryaman Jamasri . Kamsul Abraha Khasani - Kusmono Sadi Sadi Sadi Sadi Sugiarto Sugiarto Supardjo Supardjo Suyitno Suyitno Tjuk Oerbandono Toto Rusianto Viktor Malau Viktor Malau Yatno Dwi Agus Susanto