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INDONESIA
Metalurgi
Published by Lembaga Ilmu Pengetahuan Indonesia
ISSN : 01263188     EISSN : 24433926     DOI : -
Core Subject : Science,
Energy
METALURGI published by Research Center for Metallurgy and Materials LIPI. The objective of this journal is the online media for disseminating of RCMM results in Research and Development and also as a media for a scientist and researcher in the field of Metallurgy and Materials.
Arjuna Subject : -
Articles 240 Documents
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cover, daftar isi, abstrak Jurnal Metalurgi, Redaksi
Metalurgi Vol 31, No 3 (2016): Metalurgi Vol. 31 No. 3 Desember 2016
Publisher : Pusat Penelitian Metalurgi dan Material - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (362.474 KB)

Abstract

cover, daftar isi, abstrak Jurnal Metalurgi, Redaksi
Metalurgi Vol 31, No 1 (2016): Metalurgi Vol. 31 No. 1 April 2016
Publisher : Pusat Penelitian Metalurgi dan Material - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (613.894 KB)

Abstract

EFFECT OF MULTI PASS HIGH ENERGY MILLING ON MORPHOLOGY AND RHEOLOGICAL PROPERTIES OF CARBON NANOTUBES Darsono, Nono
Metalurgi Vol 29, No 2 (2014): Metalurgi Vol.29 No.2 Agustus 2014
Publisher : Pusat Penelitian Metalurgi dan Material - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (737.687 KB) | DOI: 10.14203/metalurgi.v29i2.281

Abstract

EFFECT OF MULTI PASS HIGH ENERGY MILLING ON MORPHOLOGY AND RHEOLOGICALPROPERTIES OF CARBON NANOTUBES. Multi pass high energy milling was utilized in order to cut anddisperse carbon nanotubes (CNTs) suspension. The purpose is to maintain the crystallinity and suppress thedamage. One until five passes gave increase in D- to G-band ratio which means increasing the damage, at thevalue range from 0.1 to 0.2. The ratio is still lower compare 2-hour high energy milling and 120-hourconventional ball milling, at the value of 0.5 – 0.3. The rheological properties was not altered dramatically. It isindicated that the milling only tears down the aggeregates into small fraction of entangled CNTs treads.
PENGUKURAN PENGARUH TEKANAN PERAH PADA TEGANGAN SISA PADUAN AlSi SQUEEZE CASTING DENGAN TEKNIK DIFRAKSI SINAR-X[Measurements of Pressure Die Effects on The Residual Stresses of Squeeze Casting AlSi Alloys using X-Ray Diffraction Techniques] Parikin, Parikin; Suminta, S
Metalurgi Vol 27, No 3 (2012): Metalurgi Vol.27 No.3 Desember 2012
Publisher : Pusat Penelitian Metalurgi dan Material - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (528.038 KB) | DOI: 10.14203/metalurgi.v27i3.230

Abstract

PENGUKURAN PENGARUH TEKANAN PERAH PADA TEGANGAN SISA PADUAN AlSi SQUEEZECASTING DENGAN TEKNIK DIFRAKSI SINAR-X.Telah dilakukan pengukuran tegangan sisa bahanpaduan AlSi hasil pengecoran cara perah (squeeze). Tegangan sisa yang diukur dalam daerah intergranulardisekitar batas butiran dengan metode difraksi sinar-X. Tailoring teknik difraksi-metode Rietveld mampumendapatkan parameter regangan kisi rata-rata dan full width half maximum (FWHM) setiap fasa dalam paduan.Grafik memperlihatkan bahwa fasa aluminium mengalami tegangan compressive-tensile sedang fasa silikonmengalami total tegangan compressive. Dominasi komposisi unsur aluminium mengakibatkan pola distribusitegangan sisa dalam paduan AlSi mengikuti pola tegangan sisa dalam fasa aluminium, meskipun peregangan kisididominasi fasa silikon yang mengalami regangan negatif. Hasil penelitian memperlihatkan, kurva tegangan sisadalam bahan paduan AlSi berfluktuasi antara -800 GPa hingga 400 GPa. AbstractThe measurements of residual stresses on squeeze casting AlSi alloys has been carried out. The residualstresses were measured in the inter-granular areas around the grain boundaries of the phases by using X-raydiffraction techniques. The tailoring of diffraction method and Rietveld analysis could be applied to calculatethe average lattice strains of the phases and the profile parameters (FWHM) in the specimens. The graphshows that the aluminium phase was in compressive-tensile stresses while the silicon phase was in totallycompressive stresses. The domination of aluminium composition in the specimens tends to affect the residualstress behaviour of the squeeze casting AlSi alloys. The stress distribution of the alloys follows the profile ofstress curve of aluminium phase, even-though the strains were dominated by silicon phase in negative strains.The result shows that the hydrostatic residual stresses curve of squeeze casting AlSi alloys fluctuates betweenapproxiamately -800GPa and 400 GPa.
Peningkatan Kadar Nikel Dalam Laterit Jenis Limonit Dengan Cara Peletasi, Pemanggangan Reduksi Dan Pemisahan Magnet Campuran Bijih, Batu Bara, Dan Na2SO4 [Upgrading of Nickel Content in The Limonitic Laterite Ores by Pelletizing, Reduction Roasting and Magnetic Separation of The Mixed Ores, Coal and Sodium Sulphate] Subagja, Rudi; Prasetyo, Agus Budi; Sari, Wahyu Mayang
Metalurgi Vol 31, No 2 (2016): Metalurgi Vol. 31 No. 2 Agustus 2016
Publisher : Pusat Penelitian Metalurgi dan Material - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2004.497 KB) | DOI: 10.14203/metalurgi.v31i2.156

Abstract

In Indonesia, laterite nickle ore that is low grade nickel (<1.5%) has not been used well because it is not considered beneficial. At present work, the experiment to increase nickel grade in the limonitic type of laterite ores has been caried out by pelletizing a limonitic type of laterite ores, coal and Na2SO4 mixture, it was followed with reduction roasting of pellet in muffle furnace at temperatues 800 ºC to 1100 ºC and reduction roasting time from 0,5 hours to 4 hours. The reduced ore from reduction roasting process was grounded in vibrating mill, then mixed with water and passed to magnetic separator to separate nickel concentrates from the tailing. The   concentrate with 10.28% of nickel grade   and 66,57% of iron grade was produced from hour, 10 % of coal addition and 20% of Na2SO4 addition with recovery of nickel and iron in the consentrate 64,77% and 34,66% respectively.AbstrakPada penelitian ini telah dilakukan percobaan untuk meningkatkan kadar nikel dalam bijih nikel laterit jenis limonit  dengan cara membuat pelet dari  campuran bijih nikel laterit jenis limonit, batubara dan natrium sulfat, dilanjutkan dengan pemanggangan reduksi  pelet  dalam tungku mufle pada  temperatur 800 0 C sampai dengan 1100 o C dan waktu pemanggangan reduksi dari 0,5 jam sampai dengan 4 jam. Kalsin yang dihasilkan dari proses pemanggangan kemudian digiling dalam vibrating  mill  untuk selanjutnya dicampur dengan air dan  dilewatkan kedalam alat pemisah magnet sehingga dihasilkan konsentrat dan tailing. Konsentrat dengan kadar nikel 10,28 % dan kadar besi 66,57 % diperoleh dari kalsin hasil proses pemanggangan  reduksi  pada temperatur 1000 o C selama 1 jam, penambahan batubara 10 % dan penambahan natrium sulfat 20 %, dimana perolehan nikel dan besi dalam konsentrat masing masing adalah  64,77 % dan 34,66 % 
Sintesis Kalium Magnesium Posfat Melalui Metoda Mekanokimia untuk Aplikasi sebagai Pupuk Slow Release[MECHANOCHEMICAL SYNTHESIS OF POTASSIUM MAGNESIUM PHOSPHATE FOR APPLICATION AS SLOW RELEASE FERTILIZER MATERIAL[Mechanochemical Synthesis of Potassium Magnesium Phosphate for Application as Slow Release Fertilizer Material] Solihin, Solihin
Metalurgi Vol 28, No 1 (2013): Metalurgi Vol.28 No.1 April 2013
Publisher : Pusat Penelitian Metalurgi dan Material - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (636.529 KB) | DOI: 10.14203/metalurgi.v28i1.242

Abstract

SINTESIS KALIUM MAGNESIUM POSFAT MELALUI METODA MEKANOKIMIA UNTUKAPLIKASI SEBAGAI PUPUK SLOW RELEASE.. Material yang bersifat slow release dapat digunakansebagai pupuk slow release, yakni jenis baru dimana pelepasan elemennya dapat diturunkan. Salah satu pupukslow release adalah potassium magnesium phosphate (KMgPO4). Analisa XRD terhadap material inimenunjukan bahwa kemurnian material ini cukup tinggi, hanya fasa KMgPO4 yang dapat dideteksi dalamsampel material ini. Analysis FTIR menunjukan bahwa teknik mekanokimia cukup berhasil untuk mensintesamaterial in. Analisa DTA menunjukan bahwa material ini stabil dari perubahan temperatur. Analisa morfologimenunjukan bahwa partikel yang tergranulasi memiliki ukuran sekitar 100 mikron. Dibanding dengan pupukbiasa yang nutriennya cepat larut, nutrien yang terlarut dari pupuk jenis slow release dapat diturunkan menjadisekitar 32-33, 22-24, and 0,1-0,7 %, untuk masing-masing potassium, phosphate and magnesium. Hasil ujileaching menunjukan bahwa material ini dapat digolongkan sebagai material yang bersifat slow release. AbstractThe slow release material can be applied as slow release fertilizer, a newly type of fertilizer in which itselemental release can be slowed down. One of slow release fertilizer materials is potassium magnesiumphosphate (KMgPO4). The XRD analysis of this materials shows that the phase purity is high; KMgPO4 isthe only phase can be found in the sample. The FTIR analysis shows that the mechanochemical synthesis cansuccessfully be used to produce KMgPO4. The DTA analysis shows that this material is quite stable totemperature change. The morphology analysis shows that granulated particle size material is around 100microns. Compared to the conventional fertilizer, the element released from this material can be decreaseddown to about 32-33, 22-24, and 0,1-0,7 %, for potassium, phosphate and magnesium, respectively. Theresult of leaching experiments has proven that this material can be classified as slow release materials. 
METODA FOTO BACK-REFLECTION LAUE UNTUK MENENTUKAN ARAH SUMBU KRISTAL TUNGGAL La2-2xSr1+2xMn2 O7 (x=0,4) Imaduddin, Agung
Metalurgi Vol 26, No 3 (2011): Metalurgi Vol. 26 No. 3 Desember 2011
Publisher : Pusat Penelitian Metalurgi dan Material - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (385.453 KB) | DOI: 10.14203/metalurgi.v26i3.16

Abstract

La2-2x Sr 1+2x Mn2 O7   (atau disebut  LSMO 327)  mempunyai sifat  magnetoresistance terbesar dibandingkan grup lainnya, ( seperti LSMO 113 ). Dalam pembuatan kristal tunggal diperlukan metoda yang praktis untuk menentukan arah sumbu kristal tunggalnya. Pada tulisan ini akan dipaparkan metoda penentuan arah sumbu kristal tunggal tersebut dengan memakai foto back-reflection Laue untuk mengetahui arah sumbu a, b dan c terhadap arah penumbuhan kristalnya. Dalam penelitian ini digunakan 2 sampel kristal tunggal LSMO 327 dengan konsentrasi Sr pada x=0,4. Dari metoda back reflection Laue tersebut, diketahui bahwa kristal tunggal LSMO 327 memiliki sudut arah sumbu c dengan sudut 80° terhadap arah pertumbuhan kristalnya. Sedangkan arah sumbu a dan b tidak terlihat sama pada kedua sample. AbstractMn oxide materials have long been known to have a large magnetoresistance properties. LA2-2xSr1+2xMn2O7 (or called LSMO 327) has the largest magnetoresistance properties compared to other groups (such as LSMO 113). The preparation of single crystals required a practical method to determine the direction of the axis of single crystals. In this paper, we reported a method of determining the direction of the axis of single crystals by using back-reflection Laue photographs to determine the direction of the axis a, b and c to the direction of crystal growth. We used two samples of single crystal LSMO 327 x = 0.4. By the back-reflection Laue method, we know that c-axis of LSMO 327 single crystals have an angle of 80° to the direction of crystal growth. While the direction of the a-axis and b-axis does not look the same in both samples.
PERGESERAN SUHU KRITIS SUPERKONDUKTOR Bi-Pb-Sr-Ca-Cu-O PADA MEDAN MAGNET TINGGI[The Shift In Critical Temperature Of Bi – Pb – Sr – Ca – Cu – O Superconductors In High Magnetic Field] Imaduddin, Agung; Yudanto, Sigit Dwi; Siswayanti, Bintoro; Hendrik, Hendrik
Metalurgi Vol 29, No 3 (2014): Metalurgi Vol.29 NO.3 Desember 2014
Publisher : Pusat Penelitian Metalurgi dan Material - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (302.529 KB) | DOI: 10.14203/metalurgi.v29i3.296

Abstract

PERGESERAN SUHU KRITIS SUPERKONDUKTOR Bi-Pb-Sr-Ca-Cu-O PADA MEDAN MAGNETTINGGI. Pada penelitian ini dipelajari proses pembuatan pelet superkonduktor Bi-Sr-Ca-Cu-O sebagai dasarprekursor bahan pada kawat superkonduktor yang diberi doping unsur Pb untuk menggantikan Bi, dan dibuatdengan memakai metoda pencampuran basah. Sampel yang dibuat dianalisa dengan XRD (X-ray diffractometer),EDS (energy dispersive spectroscopy) dan juga hambatan jenis listrik (resistivity) pada suhu rendah dan padamedan magnet tinggi. Berdasarkan hasil XRD dab EDS, diketahui bahwa fasa yang terbentuk adalah fasa 2212,namun terlihat juga bahwa unsur C masih banyak tersisa di dalam sampel. Dari hasil pengukuran hambatan jenislistriknya, diketahui bahwa sampel ini memiliki suhu kritis awal superkonduktor (TC onset) sebesar 79K, dan suhukritis akhir (TC final) sebesar 48K. Pengukuran hambatan jenis listrik sampel terhadap suhu juga dilakukan padamedan magnet 2 dan 4 T. TC bergeser ke suhu yang lebih rendah akibat adanya medan magnet. Pergeseran TCjuga menunjukkan bahwa sampel ini memiliki fasa 2212. Pada suhu di atas 79K terlihat sifat semikonduktorpada sampel ini, yang menunjukkan masih banyaknya unsur pengotor yang bersifat semikonduktor. AbstractThis work studied the process of making bulk Bi-Sr-Ca-Cu-O superconducting materials as the precursor material of superconducting wire, which was given Pb doping to substitute Bi. The sampel was prepared using wet mixing method. Analyzed by XRD (X-ray diffractometer), EDS (energy dispersive spectroscopy) and electrical resistivity at low temperatures and high magnetic fields. Based on the results of XRD and EDS, it is known that it formed 2212 phase, but a lot of element of C still remains in the sampel. According to the results of resistivity measurement, it shows that this sampel has initial critical temperature (TC onset) at 79K, and final critical temperature (TC final) at 48K. The measurements of the resistivity were also carried out on the magnetic field of 2 and 4 T. TC shifts to lower temperatures due to the presence of a magnetic field. The shift of TC also indicates that the sample has phase of 2212. At temperatures above 79K, visible property of semiconductor appeared, which indicates there are many impurities that are semiconductors.
PENGARUH SOLUTION ANNEALING DAN AGING PADA KAWAT PADUAN SHAPE MEMORY Ni-Ti DAN Ni-Ti-Cu[The Influence of Solution Annealing and Aging on Ni-Ti and Ni-Ti-Cu Shape Memory Alloy Wire] Mabruri, Efendi; Sriyono, Bambang; Adjiantoro, Bintang; Adnyana, DN
Metalurgi Vol 27, No 2 (2012): Metalurgi Vol. 27 No. 2 Agustus 2012
Publisher : Pusat Penelitian Metalurgi dan Material - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (379.382 KB) | DOI: 10.14203/metalurgi.v27i2.142

Abstract

PENGARUH SOLUTION ANNEALING DAN AGING PADA KAWAT PADUAN SHAPE MEMORY Ni-Ti DAN Ni-Ti-Cu. Penelitian pengaruh solution annealing dan aging pada paduan shape memory NiTi danNiTiCu telah dilakukan. Paduan dalam bentuk kawat dibuat dengan rangkaian proses peleburan vakum,pengepresan panas, pengerolan panas, penarikan kawat dan perlakuan panas (solution annealing dan aging).Pengujian yang dilakukan meliputi uji termal DSC, uji XRD dan uji tekuk panas untuk mengukur shape memoryeffect (SME). Hasil percobaan menunjukkan bahwa kawat paduan Ni-Ti-Cu (Ni-49,7Ti-9,2Cu) memiliki SMEsatu arah yang lebih tinggi dibandingkan dengan kawat Ni-Ti (Ni-48,8Ti) baik pada kondisi solution annealingmaupun aging. Kawat NiTi pada kondisi solution annealing memiliki SME dua arah yang lebih besar dari padakawat NiTi pada kondisi aging. Sedangkan pada kawat NiTiCu, kondisi paduan (solution annealing dan aging)relatif tidak berpengaruh terhadap SME dua arah. Penambahan Cu di dalam paduan Ni-Ti berpengaruh lebihbesar terhadap SME dua arah pada kawat dalam kondisi aging dibandingkan pada kawat dalam kondisi solutionannealing.AbstractTHE INFLUENCE OF SOLUTION ANNEALING AND AGING ON Ni-Ti AND Ni-Ti-Cu SHAPEMEMORY ALLOY WIRE. The influence of solution annealing and aging on NiTi and NiTiCu shape memoryalloy has been investigated. The alloys in wire form were fabricated through vacum arc melting, hot pressing,hot rolling, wire drawing and finally heat treating of solution annealing dan aging). The alloy wire wascharacterized by thermal analysis (DSC), XRD and bending-heating test to measure the shape memory effect(SME). The experimental results showed that the Ni-Ti-Cu wire (Ni-49.7Ti-9.2Cu) exhibited one-way SMEhigher than that of the Ni-Ti wire (Ni-48.8Ti) in both conditions of solution annealed and aged. The two-waySME exhibited by solution annealed NiTi wire was larger than that exhibited by aged NiTi wire. With respect toNiTiCu wire, the alloy conditions (solution annealed and aged) relatively had no effect on the two-way SME ofthe alloy. Finally, it was found that the effect of Cu on two-way SME was larger in the aged Ni-Ti alloy than insolution annealed Ni-Ti alloy.
indeks, panduan Jurnal Metalurgi, Redaksi
Metalurgi Vol 28, No 3 (2013): Metalurgi Vol.28 No.3 Desember 2013
Publisher : Pusat Penelitian Metalurgi dan Material - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/metalurgi.v28i3.399

Abstract

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