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All Journal Rotasi Ganendra: Majalah IPTEK Nuklir Urania Jurnal Ilmiah Daur Bahan Bakar Nuklir Jurnal Sains dan Teknologi Nuklir Indonesia (Indonesian Journal of Nuclear Science and Technology) Rekayasa Mesin JTERA (Jurnal Teknologi Rekayasa) Indonesian Journal of Chemistry Jurnal Kartika Kimia Majalah Ilmiah Pengkajian Industri Kappa Journal Jurnal TEDC Metalurgi Journal Of Chemical Process Engineering
Djoko Hadi Prajitno
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PENGARUH PERLAKUAN PELARUTAN TERHADAP SIFAT MEKANIK DAN STRUKTUR MIKRO PADUAN TERNER Zr-Nb-Mo UNTUK BIOMATERIAL Nur Alam, Dzikry Syamsul; Ambardi, Pradoto; Prajitno, Djoko Hadi
Majalah Ilmiah Pengkajian Industri Vol 13, No 1 (2019): MAJALAH ILMIAH PENGKAJIAN INDUSTRI
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/mipi.v13i1.3089

Abstract

Penelitian dilakukan untuk mempelajari pengaruh perlakuan pelarutan terhadap sifat mekanik dan stuktur mikro paduan terner Zr-Nb-Mo untuk biomaterial. Paduan zirkonium dapat digunakan sebagai bahan implan. Paduan Zr-5Nb-xMo (x= 0, 1, 3 dan 5 %wt) dilakukan perlakuan pelarutan dengan variasi temperatur 900oC, 950oC dan 1000oC dengan pendinginan cepat menggunakan media air. Hasilnya menunjukan bahwa meningkatnya kandungan molibdenum, meningkatkan fasa β-Zr dan meningkatnya temperatur perlakuan pelarutan dapat meningkatkan kekerasan paduan zirconium. Hal tersebut terjadi karena unsur molibdenum bertidak sebagai beta stabilizer dan perlakuan pelarutan membentuk perubahan bentuk fasa β-Zr dari plate menjadi lath yang lebih halus. Pengujian kekerasan Rockwell C dengan nilai kekerasan tertinggi 53,67 HRC paduan Zr-5Nb-1Mo perlakuan pelarutan 1000oC, fasa yang terbentuk adalah α-Zr, β-Zr, dan intermetalik Mo2Zr paduan Zr-5Nb-5Mo yang diidentifikasi menggunakan X-Ray Diffraction (XRD).
High Temperature Cyclic Oxidation Behaviour Ternary Ni-Al-Ti Alloys doped with Ge at 1200oC Setiawan, Yuniarto Hendrik; Ambardi, Pradoto; Prajitno, Djoko Hadi
Jurnal Rekayasa Mesin Vol 10, No 1 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.01.11

Abstract

Ni base alloys are widely used for high temperature applications, such as pressure vessel , turbine blade. Ni-base alloys possess oxidation resistance, creep resistance, fatigue resistance, the stability of the microstructure and good mechanical properties at elevated temperatures. The Ni-Al-Ti alloys were melted in a single arc melting furnace under ultra high argon atmosphere.   Cyclic oxidation of the alloys was performed in air furnace at 1200 °C temperature for 25 cycles Each cycle consisted of 1 hr heating at 1200°C in an alumina tube furnace followed by 30 min cooling at room temperature. The results show that the higher addition of Ge element content can improve the mechanical properties and oxidation resistance of Ni based alloys. X-ray diffraction examination showed that the compounds were formed on the alloy after smelting Ni3Al, Ni3Ti, Ni3Ge, Ni and Ni2AlTi. While the oxide on the alloy after oxidizing to form a compounds NiO, NiTiO3, GeO2, and TiO2. In the SEM-EDS examination showed that the composition of Ge formed more dominant in the area under the element Ni oxide layer. The higher the Ge element content in the alloy has improved the resistance of the alloy indicated by the thin layer of oxide formed on the surface of the alloy.
PENGARUH PROSES OKSIDASI LAPISAN METAL MATRIX COMPOSITE PADA SUBSTRAT SS316 Martides, Erie; Romadhona, Candra Dewi; Prajitno, Djoko Hadi; Prawara, Budi
JTERA (Jurnal Teknologi Rekayasa) Vol 4, No 2: December 2019
Publisher : Politeknik Sukabumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31544/jtera.v4.i2.2019.277-282

Abstract

Material SS316 seringkali digunakan untuk komponen yang bekerja pada temperatur tinggi dengan resiko mengalami oksidasi yang menyebabkan penurunan sifat material dan umur pakai dari komponen. Deposisi Metal Matrix Composite (MMC) NiCr+Cr3C2+Al2O3 dan NiCr+WC12Co+Al2O3 menggunakan metode High Velocity Oxygen Fuel (HVOF) thermal spray coating dengan parameter konstan dilakukan sebagai proses perlakuan pada permukaan SS316 untuk meningkatkan nilai kekerasan dan ketahanan terhadap oksidasi.  Tujuan penelitian ini adalah untuk mengetahui pengaruh proses oksidasi lapisan MMC pada material substrat SS316. Proses oksidasi dilakukan dengan variasi temperatur 500° dan 600°C, penahanan temperatur selama 6 jam, kemudian diteruskan dengan karakterisasi serta perhitungan laju oksidasi. Hasil penelitian menunjukkan spesimen MMC NiCr+Cr3C2+Al2O3 yang dilakukan proses oksidasi pada suhu 500°C memiliki laju oksidasi terendah yaitu 6,67 x 10-7 gram/mm2 jam. 
PENGARUH PERLAKUAN PELARUTAN TERHADAP SIFAT MEKANIK DAN STRUKTUR MIKRO PADUAN TERNER Zr-Nb-Mo UNTUK BIOMATERIAL Nur Alam, Dzikry Syamsul; Ambardi, Pradoto; Prajitno, Djoko Hadi
Majalah Ilmiah Pengkajian Industri Vol. 13 No. 1 (2019): Majalah Ilmiah Pengkajian Industri
Publisher : Deputi TIRBR-BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/mipi.v13i1.3089

Abstract

Penelitian dilakukan untuk mempelajari pengaruh perlakuan pelarutan terhadap sifat mekanik dan stuktur mikro paduan terner Zr-Nb-Mo untuk biomaterial. Paduan zirkonium dapat digunakan sebagai bahan implan. Paduan Zr-5Nb-xMo (x= 0, 1, 3 dan 5 %wt) dilakukan perlakuan pelarutan dengan variasi temperatur 900oC, 950oC dan 1000oC dengan pendinginan cepat menggunakan media air. Hasilnya menunjukan bahwa meningkatnya kandungan molibdenum, meningkatkan fasa β-Zr dan meningkatnya temperatur perlakuan pelarutan dapat meningkatkan kekerasan paduan zirconium. Hal tersebut terjadi karena unsur molibdenum bertidak sebagai beta stabilizer dan perlakuan pelarutan membentuk perubahan bentuk fasa β-Zr dari plate menjadi lath yang lebih halus. Pengujian kekerasan Rockwell C dengan nilai kekerasan tertinggi 53,67 HRC paduan Zr-5Nb-1Mo perlakuan pelarutan 1000oC, fasa yang terbentuk adalah α-Zr, β-Zr, dan intermetalik Mo2Zr paduan Zr-5Nb-5Mo yang diidentifikasi menggunakan X-Ray Diffraction (XRD).
Pengaruh Mechanical Cleaning dan Heat Treatment Komposit Nikel-Grafit Hasil Thermal Spray Coating Terhadap Bond Strength dan Kekerasan pada Substrat Baja AISI 321 Prajitno, Djoko Hadi
ROTASI Vol 22, No 4 (2020): VOLUME 22, NOMOR 4, OKTOBER 2020
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.22.4.236-241

Abstract

Thermal spray coating (TSC) is one of the coating methods to prevent direct interaction between the surface of the substrate and the operating environment, which has the potential to degrade the function and lifetime of the component or even the system as a whole. In this study, an investigation of Ni-Al coating quality as a bondcoat and Ni-C as a topcoat on AISI 321 Steel substrate with 3 variations of the treatment of the specimen. Variation of treatment (treatment) ie the first specimen is directly tested for bond strength, while the second specimen is given heat treatment and the third specimen is subjected to mechanical cleaning. Both substrate, bond coat and top coat are characterized by testing bond strength, hardness, microstructure and chemical composition. Bond strength test results are 2042-5404 psi for specimens with heat treatment, 597-731 psi for specimens with mechanical cleaning, and 842 psi for specimens of thermal spray results, while the hardness value is 261-308 HVN for top coat, 333-HVN for specimens with mechanical cleaning, and 195-240 HVN for specimens with heat treatment.
MECHANOSYNTHESIS OF MMC Cu-C DOPED WITH Ti FOR APPLICATION OF PANTOGRAPH CONTACT STRIP (PCS) Rahmanullah, Andhika Abdan; Pawawoi, Pawawoi; Prajitno, Djoko Hadi
Majalah Ilmiah Pengkajian Industri Vol. 14 No. 3 (2020): Majalah Ilmiah Pengkajian Industri
Publisher : Deputi TIRBR-BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/mipi.v14i3.4168

Abstract

This research was conducted to determine the effect of the addition of Titanium (Ti) and the sintering temperature variation on MMC CuC alloys as reinforcing elements. The process of this research uses powder metallurgical method with an alloying technique in Mechanical Alloying using a Planetary Ball Mill (PBM) machine with a speed of 600 rpm for 2 hours, the ratio of powder to the ball mill is 10:1. The compacting process is carried out using dies 11 mm in diameter and compacting pressure of 90 Kg/cm2. The sintering process is carried out three times, with variations in sintering of 800oC, 900oC, and 1000oC with sintering time for 1 hour in the tube furnace in the argon gas vacuum environment. The number of samples used in this study amounted to 9 samples with variations in alloy and temperature sintering, consist of MMC CuC alloy with addition of Ti 0%, 0.5%, 1.5% (T=800 oC), MMC CuC with  addition of Ti 0%, 0.5%, 1.5% (T=900 oC), and MMC CuC with addition of Ti 0%, 0.5%, 1.5% (T=1000 oC). The tests included Vickers hardness testing, metallography testing, XRD testing, and SEM-EDS testing. The addition of Ti elements and varying sintering temperature had an effect on the hardness value of MMC CuC material with the highest hardness value in samples with 1.5% Ti alloy (800oC) which is 87.25 HV, and the lowest porosity value is 2.491% in the sample of 1.5% Ti (1000oC). Keywords : MMC CuC; Mechanical Alloying; Titanium; Pantograph Contact Strip
PENGARUH PENAMBAHAN CoO TERHADAP FAKTOR KENON LINEARAN DAN STRUKTUR MIKRO VARISTOR ZnO-Bi203 Dani Gustaman Syarif; Djoko Hadi Prajitno; Engkir Sukirman; Bambang Ariwahjoedi
Jurnal Sains dan Teknologi Nuklir Indonesia (Indonesian Journal of Nuclear Science and Technology) Vol 4, No 1 (2003): Februari 2003
Publisher : BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jstni.2003.4.1.1681

Abstract

PENGARUH PENAMBAHAN CoO TERHADAP FAKTOR KENON LINEARAN DAN STRUKTUR MIKRO VARISTOR ZnO-Bi203. Untuk mencari varistor yang efektif, studi pengaruh periambahan CoO terhadap karakteristik varistor ZnO-Bi203 telah dipelajari. Dalam studi ini dilakukan penyinteran pelet ZnO-0,8% mol Bi203 yang ditambahi O hingga 2 % mol CoO pada suhu 1100°C selama 1 jam, serta analisis metalografi dan difraksi sinar-X. Penambahan CoO diketahui telah mmeningkatkan faktor kenon-linearan varistor ZnO- Bi203 karena CoO telah mengurangi jumlah cacat sebagai sumber elektron berenergi aktivasi rendah dan menghasilkan jebakan elektron yang dalam yang merupakan sumber elektron berenergi aktivasi tinggi. Flarga faktor kenon-linearan yang sesuai kebutuhan pasar yaitu antara 20-50 dapat diperoleh dengan menambahkan CoO dengan konsentrasi 0,5 hingga 2 % mol. Analisis metalografi dan difrak sisinar-X memperlihatkan bahwa pada struktur mikro varistor ZnO-Bi203 -CoO, lapisan batas butir dibentuk oleh ZnO-24Bi2O3 dan butirnya dibentuk oleh larutan padat ZnO-CoO.
The Effect of Variations in Current and Time to Manufacture Powder Tin (Sn) via Electrodeposition Process Raden Henny Mulyani; Yuliani Carisca Tanjung; Djoko Hadi Prajitno
Jurnal Kartika Kimia Vol 2 No 1 (2019): Jurnal Kartika Kimia
Publisher : Department of Chemistry, Faculty of Sciences and Informatics, Jenderal Achmad Yani University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (915.456 KB) | DOI: 10.26874/jkk.v2i1.21

Abstract

Manufacture of powder metallurgy through the process of electrolysis, resulting in the phenomenon of deposition on the cathode. Electrolysis process produces high purity but many compounds decompose participating will affect its purity. Pulverizing tin (Sn) is done by varying the amount of current (5 A , 6 A and 7 A) and processing time (20 minutes , 25 minutes and 30 minutes) with variable fixed temperature of 50 ° C and solution concentration of 0.01 M. Electrode used is stainless steel 304 as the cathode and tin (Sn) as the anode. Powder tin (Sn) generated reaches 80 % , the most current efficiency is obtained from the current 6 A with a time of 20 minutes and the lowest energy consumption derived from the current of 5 A at 20 , 25 and 30 minutes at 4.6 KWH / kg Sn. From the results obtained are expected to be a material consideration in producing powder tin (Sn).
Elektrodeposisi Komposit Hidroksiapatit-Kitosan dari Bahan Lokal pada Baja Tahan Karat SS 304 Sarah Nasma'ul Aulia; R. Henny Mulyani; Djoko Hadi Prajitno
Jurnal Kartika Kimia Vol 2 No 2 (2019): Jurnal Kartika Kimia
Publisher : Department of Chemistry, Faculty of Sciences and Informatics, Jenderal Achmad Yani University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (578.67 KB) | DOI: 10.26874/jkk.v2i2.37

Abstract

In this Research to determine the effect of processing time and the difference of the composition of chitosan in Hydroxyapatite (HA) solution to the weight efficiency of the result from the electrodeposition process, it was used 9 samples but only 3 were carried out into characterization testing they’re HA + Chitosan 10% sample (5 hours), HA + Chitosan 20% (1 hour), HA + Chitosan 20% (5 hours), the current density used during the electrodeposition process is 1.8 A / cm3. The process of stirring with an ultrasonic stirrer is important, so that the colloidal powder contained in the electrolyte solution becomes homogeneous. Characterization tests include X-ray Diffraction (XRD) testing, scanning Electron Microscopy (SEM) and Simulated Body Fluid (SBF). The addition of chitosan to HA alloy solutions is very useful to increase the stickiness of the sediment layer on the substrate, because the properties of HA is very fragile when in direct contact with human body fluids its because of the low level of stability. In this study the highest peak on the X-Ray Diffraction pattern was found in the composite HA + Chitosan 20% (1 hour), which is the position 31.91, and for the% weight of calcium (Ca) in the HA + Chitosan sample 20% (1 hour) also the highest among other samples was 27.03%. From the SBF test results, the highest corrosion rate in the HA + Chitosan 10% sample is 1.076 mpy, while for the HA + Chitosan sample 20% is only 0.058 mpy. Keywords: Electrodeposition, Hydroxyapatite, Chitosan, Ultrasonic Stirrer, XRD, SEM-EDS, SBF, Calsium
Ketahanan Korosi pada Paduan Mg –1Mn–HA Sebagai Bahan Biomaterial Hasil Proses Mechanosynthesis dalam Media Ringer Lachtate Ihwan Bayu Setiawan; Djoko Hadi Prajitno; R Henny Mulyani
Jurnal Kartika Kimia Vol 4 No 1 (2021): Jurnal Kartika Kimia
Publisher : Department of Chemistry, Faculty of Sciences and Informatics, University of Jenderal Achmad Yani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26874/jkk.v4i1.71

Abstract

Biomaterial dari bahan biodegradable akhir - akhir ini sedang dilakukan penelitian lebih lanjut untuk menggantikan biomaterial non biodegradable yang memiliki sifat toksisitas di dalam tubuh namun material biodegradable memiliki sifat kimia-fisika dan sifat mekaniknya belum menyerupai tulang asli maka dari itu butuh paduan yang tepat untuk biomaterial biodegradable. Magnesium memiliki sifat biodegradable, biocompatible, non toxic, dengan modulus elastisitas 42 GPa yang relatif dekat dengan modulus elastisitas tulang (3 – 40 GPa). Metode yang digunakan dalam pembuatan biomaterial dari bahan biodegradable adalah pemaduan mekanik pada paduan Mg – 1%Mn - Hydroxyapatite menggunakan metode mechanosynthesis. Dengan waktu milling 2 jam dengan kecepatan 1000 rpm. Tekanan Kompaksi 10 MPa serta waktu sintering 2 jam sehingga menyebabkan terbentuknya porositas yang dihasilkan dari metode ini diisi oleh hydroxyapatite (HA) bereaksi membentuk ikatan jaringan dengan tulang. Karakterisasi paduan Mg – 1%Mn – HA dilakukan dengan menggunakan pengujian kekerasan micro vickers, metalografi, laju korosi, SEM – EDS, dan XRD. Nilai kekerasan dari paduan Mg – 1Mn, nilai rata – rata kekerasan pada paduan Mg – 1Mn Non HA yaitu 34,87 HVN, Mg – 1Mn – 10% HA yaitu 42,03 HVN, Mg – 1Mn – 15% HA yaitu 43,19 HVN, dan Mg – 1Mn – 20% HA yaitu 47,79 HA. Analisis XRD dapat diketahui bahwa fasa yang terbentuk pada paduan Mg-1%Mn yaitu terbentuk paduan Mg + α Mn, dan pada padauan Mg-1%Mn yaitu terbentuk Mg + α Mn dan Ca10(Po4)6(OH)2. Nilai laju korosi pada paduan Mg – 1Mn – Non HA memiliki laju korosi 1.035e3 mpy sedangkan pada sampel paduan Mg – 1Mn – 10% HA memiliki laju korosi 487 mpy. Kata Kunci : Biomaterial, Biodegradable, Mechanosynthesis, Hidroxyapatite. Larutan Ringer Lachtate
Co-Authors Achmad, Tria Laksana Ahmad Syafiq Akhmad Ardian Korda, Akhmad Ardian Ambardi, Pradoto Ambardi, Pradoto Andi Mustari, Asril Pramutadi Aprilianda, Adam Artawan, I Nengah Bambang Ariwahjoedi Basuki, Eddy Agus Budi Prawara Dani Gustaman Syarif Dzikry Syamsul Nur Alam Engkir Sukirman Erie Martides Henny Mulyani I Gde Antha Kasmawan Ihwan Bayu Setiawan Immanuel, Perdana Jihad, Bagus Hayatul Lestari, Ernyta Mei Mohamad Iqbal Nurrobi Muhammad, Fadhli Murzid, Jihan Qothrunada Mustari, Asrili Pramutadi Andi Nur Alam, Dzikry Syamsul Nur Alam, Dzikry Syamsul Pawawoi, Pawawoi Pradoto Ambardi Pratama, Ahmad Brian R Henny Mulyani R. Henny Mulyani Raden Henny Mulyani Rahmanullah, Andhika Abdan Romadhona, Candra Dewi Roswita, Fahma Sarah Nasma'ul Aulia Setianto, Muhamad Hananuputra Setiawan, Yuniarto Hendrik Spardi, I Wayan Sri Bimo Pratomo, Sri Bimo Wafda, Hakimul Wayan Gede Suharta Widiawati, Nina Yongjin Kim, Yongjin Yuliani Carisca Tanjung