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Pengaruh Konsentrasi Polivinil Alkohol (PVA) Terhadap Performa Elektrokimia LiTi2(PO4)3 Hasil Proses Sol-Gel Sebagai Anoda Untuk Baterai Ion Lithium Tipe Aqueous Elektrolit Ilham Azmy; Lukman Noerochim
Jurnal Teknik ITS Vol 3, No 2 (2014)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Penelitian tentang baterai ion lithium sebagai sistem penyimpanan energi berkembang begitu pesat. Pada baterai ion lithium, salah satu bagian utama adalah anoda yang terdiri atas material LiTi2(PO4)3. Maka, penelitian ini bertujuan untuk mengetahui pengaruh konsentarsi polivinil alkohol (PVA) terhadap performa elektrokimia LiTi2(PO4)3 sebagai anoda baterai ion lithium. Proses sintesis material LiTi2(PO4)3 dilakukan dengan proses sol-gel menggunakan Li2CO3, TiO2, NH4H2PO4, dan variasi penambahan konsentrasi 5 wt%, 10 wt%, 15 wt% polivinil alkohol (PVA). Pada pengujian XRD dari ketiga sampel, teridentifikasi LiTi2(PO4)3 sesuai dengan JCPDS 35-074 meskipun masih ada fasa lain dalam intensitas yang kecil. Pengujian SEM menunjukkan bahwa material LiTi2(PO4)3 5wt% PVA memiliki ukuran partikel yang lebih kecil dibandingkan dengan lainnya. Namun demikian, ukuran partikel tidak merata dan masih ada sedikit aglomerasi karena proses kalsinasi pada temperatur tinggi. Pengujian performa elektrokimia Cyclic Voltammetry (CV) menunjukkan bahwa anoda LiTi2(PO4)3 5wt% PVA menunjukkan nilai kinetik ion yang tinggi, karena pada anoda tersebut memiliki ukuran partikel yang paling kecil dibandingkan yang lainnya sehingga meningkatkan difusivitas ion Li+. Adapun pengujian Galvanostat Charge-Discharge menunjukkan bahwa anoda LiTi2(PO4)3 5wt% PVA memiliki stabilitas yang lebih baik karena pada anoda LiTi2(PO4)3 5wt% PVA memiliki sebaran ukuran partikel yang lebih kecil sehingga transfer ion saat proses interkalasi/de-interkalasi dapat berlangsung secara stabil.

The Effect of Hold Time Variation in the Annealing Process To Mechanical Properties and Microstructure of Austenitic Manganese Steel Ilham Azmy; Albert Daniel Saragih
Jurnal Teknik Mesin (JTM) Vol 10, No 2 (2020)
Publisher : LP2M - Institut Teknologi Padang

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

Manganese steel is a special alloy steel which has good mechanical properties, especially high ductility and toughness values. This steel has high work hardening capability so it will be easy to engineer. In industrial applications, this steel is susceptible to a decrease in the value of its mechanical properties such as the hardness value due to continuous loading. From these problems, a steel engineering process is needed in order to significantly improve the mechanical properties of steel so that it has good durability and lifetime. This study aims to determine the effect of holding time of heat annealing treatment process on the microstructure and mechanical properties of austenitic manganese steel. This research was conducted by heating the annealing process at a temperature of 1000 oC with four variations of holding time for 0, 40, 80, and 120 minutes. After the austenitic manganese steel specimen is heated for a certain time, it is then subjected to very high temperature cooling (in the furnace). The steel specimen is then prepared for metallographic testing and mechanical properties (hardness) testing. Metallographic testing is carried out to be able to analyze the microstructure formed in the austenitic manganese steel specimens after undergoing annealing process. From the metallography results, it was found that the effect of holding time on the annealing process affected carbide precipitation at the grain boundaries in the austenite matrix of manganese steel specimens. In the annealing process with a holding time of 80 minutes, the austenitic manganese steel showed a microstructure with perfect carbide precipitation at the grain boundaries so that this would have an effect on a significant increase in the hardness value. From the results of the hardness test, it was also found that the hardness value of steel specimens by annealing process for 80 minutes was 39.5 HRc. Thus, the effect of the optimal holding time of the annealing heat treatment process to improve the microstructure and mechanical properties (hardness value) is 80 minutes

The Effect of Hold Time Variation in the Annealing Process To Mechanical Properties and Microstructure of Austenitic Manganese Steel Ilham Azmy; Albert Daniel Saragih
Jurnal Teknik Mesin Vol 10 No 2 (2020): Jurnal Teknik Mesin Vol.10 No.2 October 2020
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Manganese steel is a special alloy steel which has good mechanical properties, especially high ductility and toughness values. This steel has high work hardening capability so it will be easy to engineer. In industrial applications, this steel is susceptible to a decrease in the value of its mechanical properties such as the hardness value due to continuous loading. From these problems, a steel engineering process is needed in order to significantly improve the mechanical properties of steel so that it has good durability and lifetime. This study aims to determine the effect of holding time of heat annealing treatment process on the microstructure and mechanical properties of austenitic manganese steel. This research was conducted by heating the annealing process at a temperature of 1000 oC with four variations of holding time for 0, 40, 80, and 120 minutes. After the austenitic manganese steel specimen is heated for a certain time, it is then subjected to very high temperature cooling (in the furnace). The steel specimen is then prepared for metallographic testing and mechanical properties (hardness) testing. Metallographic testing is carried out to be able to analyze the microstructure formed in the austenitic manganese steel specimens after undergoing annealing process. From the metallography results, it was found that the effect of holding time on the annealing process affected carbide precipitation at the grain boundaries in the austenite matrix of manganese steel specimens. In the annealing process with a holding time of 80 minutes, the austenitic manganese steel showed a microstructure with perfect carbide precipitation at the grain boundaries so that this would have an effect on a significant increase in the hardness value. From the results of the hardness test, it was also found that the hardness value of steel specimens by annealing process for 80 minutes was 39.5 HRc. Thus, the effect of the optimal holding time of the annealing heat treatment process to improve the microstructure and mechanical properties (hardness value) is 80 minutes.

Pengaruh Variasi Media Pendingin Proses Quenching Terhadap Mikrostruktur dan Sifat Mekanik Baja Hadfield Ilham Azmy
Infotekmesin Vol 13, No 2 (2022): Infotekmesin: Juli, 2022
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v13i2.1331

Baja mangan yang mengandung 1,2% C dan 12% Mn dikenal secara umum sebagai baja Hadfield. Berdasarkan tingginya kandungan unsur C dan Mn, struktur utama baja ini didominasi oleh matriks austenit yang dikelilingi fasa karbida pada batas butirnya. Struktur tersebut biasanya rapuh dan cenderung tidak layak untuk penggunaan dalam kondisi pembebanan tinggi. Pada penelitian ini dilakukan proses perlakuan panas quenching dengan memanaskan baja Hadfield hingga temperatur 1000 °C, kemudian dilanjutkan pendinginan cepat dengan menggunakan variasi media pendingin yaitu air dan air garam dengan penambahan 20 wt.% NaCl. Pemilihan variasi media pendingin ini bertujuan untuk mengetahui tingkat pembentukan fasa karbida dan pengaruhnya terhadap mikrostruktur dan sifat mekaniknya. Dari hasil pengujian didapatkan bahwa baja Hadfield dengan parameter quenching air garam 20 wt.% NaCl memiliki transformasi mikrostruktur yang signifikan sehingga berefek pada peningkatan nilai kekuatan tarik dan luluh (809,5 dan 542,4 MPa), kekerasan (238 HV), keuletan dan ketangguhannya.

OPTIMASI PARAMETER PEMOTONGAN CNC WET MILLING TERHADAP KEKASARAN PERMUKAAN STAINLESS STEEL AISI 304 Deni Mulyana; Ilham Azmy; Alvaro Gabrian; Rudy Yuni Widiatmoko; Petrus Londa
Steam Engineering Vol. 4 No. 1 (2022): STEAM Engineering, Vol. 4, No. 1, September 2022
Publisher : Program Studi Pendidikan Teknik Mesin, Fakultas Keguruan dan Ilmu Pendidikan, Universitas Palangka Raya

Optimization of CNC wet milling cutting parameters for stainless steel AISI 304 was successfully attempted by using Taguchi method (S/N ratio and ANOVA). L9 orthogonal array is utilized for designing the experiments with 3 levels of spindle speeds and feed rates with an increment depth of cut. The effect of cutting parameters on surface roughness was examined. According to S/N ratio’s response table, the result obtained for spindle speed fervently indicates that spindle speed is the most pivotal factor for impacting the surface roughness than feed rate for stainless steel AISI 304. ANOVA results depicted that the contribution percentage of spindle speed for surface roughness is higher than feed. Optimum values of cutting parameters were endowed at a spindle speed of 3184 rpm and a feed rate of 1528,4 mm/min. The experimental values at optimum cutting condition were compared with predicted values and it reveals a significant congruity with the experimental results with a low error percentage. Therefore, this experiment aims to develop the productivity and quality of CNC milling operations for stainless steel AISI 304. In addition, number of studies for cutting parameter optimization stainless steel AISI 304 was not barely done yet. Hereafter, more investigations still needed to optimize the cutting parameters of this stainless steel AISI 304 for various machining operations specifically on CNC milling process.

Microstructure and Mechanical Properties of Pack Carburized AISI 1020 Steel Using Na2CO3 and CaCO3 Catalysts Abdul Karim; Ilham Azmy; Silviani Qotrunnida Khoiriah; Carolus Bintoro
Journal of Renewable Energy and Mechanics Vol. 5 No. 02 (2022): REM VOL 5 NO 02 2022
Publisher : UIR PRESS

AISI 1020 steel is categorized in low carbon steel which widely used for automotive parts industry and construction because its characteristic like high ductility, relatively low hardness value, and high formability. In continuously usage for long time, this steel tends to be worn down because its low surface hardness value. The surface hardness is congruity to wear resistance of AISI 1020 steel. In this research, the experimental method of pack carburizing process was carried out by heating AISI 1020 steel samples packed along charcoal with catalysts variation of Na2CO3 and CaCO3 till temperature 900 oC and hold it for 4 hours to effect diffusion carbon mechanism in surface treatment. Thereupon, AISI 1020 steel samples was fast cooled by using distilled water. The selection of different catalyst variation according to diffusion capability which will be expected to enhance AISI 1020 steel’s microstructure and mechanical properties. From this research, it obtained that pack carburized AISI 1020 steel using Na2CO3 possesses significant microstructure transformation which will affect to the highest hardness value increment (505,4 HV) and the lowest wear rate decrease (0,00821 mm3/minute). Thereby, pack carburized AISI 1020 steel using Na2CO3 also exhibits good wear resistance characteristic so that can be used in long lifetime.

Pengaruh Variasi Media Pendingin Proses Quenching Terhadap Mikrostruktur dan Sifat Mekanik Baja Hadfield Ilham Azmy
Infotekmesin Vol 13 No 2 (2022): Infotekmesin: Juli, 2022
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v13i2.1532

Manganese steel contains 1,2% C and 12% Mn generally recognized as Hadfield steel. Based on the high composition of C and Mn elements, the main structure of this steel is dominated by an austenite matrix that surrounded the carbide phase on the grain boundary. This structure is usually brittle which leads to improper high-loading conditions. To overcome this problem, the experimental method was carried out by heating Hadfield steel to a temperature of 1000 oC, then followed by a quenching process using cooling media variations namely water and salt bath (20 wt.% NaCl solution). These cooling media variations aim to determine the level of carbide formation which affects the microstructure and mechanical properties. From the test results, it was obtained that Hadfield steel with salt bath (20 wt.% NaCl) quenching variation has significant microstructure transformation which affects enhancement of the value of tensile and yield strength (809,5 and 542,4 MPa), hardness (238 HV), ductility and toughness.

Pengaruh Parameter Pemotongan Proses CNC Wet Milling Stainless Steel AISI 316 Terhadap Kekasaran Permukaan Ilham Azmy; Deni Mulyana; Alvaro Gabrian; Rudy Yuni Widiatmoko; Petrus Londa
JURNAL ILMIAH MOMENTUM Vol 18, No 2 (2022)
Publisher : Universitas Wahid Hasyim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36499/jim.v18i2.7134

Proses pemesinan CNC wet milling pada material stainless steel AISI 316 dengan beberapa parameter pemotongan telah berhasil dilakukan dalam penelitian ini. Analisis optimasi parameter pemotongan menggunakan metode Taguchi dengan teknik perhitungan S/N ratio dan ANOVA. Untuk merancang proses eksperimentasi CNC wet milling dengan tiga parameter pemotongan yang bervariasi, maka digunakan teknik L9 orthogonal array. Dari tabel S/N ratio yang telah dianalisis, maka didapatkan bahwa kecepatan pemotongan (feed rate) menjadi faktor yang paling berpengaruh terhadap perubahan kekasaran permukaan bila dibandingkan dengan parameter kecepatan spindel dan kedalaman pemotongan pada material stainless steel AISI 316. Disisi lain, hasil pengolahan data ANOVA menunjukkan bahwa persentase kontribusi spindle speed lebih berpengaruh terhadap kekasaran permukaan bila dibandingkan feed rate. Paramater pemotongan optimal yang ditunjukkan dari spindle speed sebesar 3184 rpm, feed rate sebesar 541,4 mm/min dan depth of cut sebesar 0,3 mm. Parameter pemotongan optimal yang merupakan hasil proses eksperimen ini telah dibandingkan dengan nilai prediksi yang selanjutnya memperlihatkan korelasi yang berkaitan dengan nilai error yang relatif sangat kecil. Maka dari itu, penelitian ini memberikan sumbangsih pengembangan yang signifikan pada peningkatan machineability, kualitas, dan produktifitas proses pemesinan CNC milling untuk material stainless steel AISI 316.

THE EFFECT OF VARIATIONS SPEED OF THE CONDENSER FAN WITH CONTROL FREQUENCY INVERTER ON THE ICE SLUSH MACHINE APPLICATION Rizki Muliawan; Septyansah Septyansah; Nur Khakim; Bowo YP; MA Falahuddin F; Ilham Azmy
AUSTENIT Vol. 14 No. 2 (2022): AUSTENIT: October 2022
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/austenit.v14i2.4955

The condenser is one of the main components in the ice slush machine system that functions to removed heat from the system to the environment. In this system, the condenser is equipped with a fan whose rotation speed is modified using an inverter that aims to determine the system performance and condenser capacity at each fan rotation variation of the ice slush machine. There are 3 variations of frequency settings in this system 50 Hz, 40 Hz, and 30 Hz, with equivalent velocity air 3.6, 2.9, and 1.9 m/s respectively. In this study, the performance of the ice slush machine with various condenser fan speed settings was studied including, how long the product temperature is reached, condenser capacity, actual COP, efficiency, and electrical power. The test results show that the fastest product temperature is reached when using a fan speed setting of 1397 rpm, which is 145 minutes with a condenser capacity of 42.36 kW. The highest actual COP is obtained from the fan speed set at 1397 rpm of 2.58 with an efficiency of 57.5% and electrical power consumption of 269.64 W. The fan speed setting at 1090 rpm has a condenser capacity of 33.78 kW, COPactual of 2.46 with an efficiency of 56.2%, and electric power consumption of 272.09 W. The fan speed setting at 711 rpm has a condenser capacity of 21.73 kW, an actual CO of 2.15 with an efficiency of 49.2%, and electric power consumption of 312.71 W.

Perancangan Alat Peniris Minyak Pada Makanan Dengan Pengatur Putaran Kapasitas 2 Kg Ilham Azmy; Bagja Ahmad Bajuri; Petrus Londa
Jurnal Sinergi Jurusan Teknik Mesin Vol 20, No 2 (2022): Oktober 2022
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/sinergi.v20i2.3513

Minyak goreng merupakan salah satu kebutuhan pokok dalam proses memasak untuk menunjang kebutuhan sehari-hari. Proses penggunaan minyak goreng biasanya dilakukan secara berulang sehingga masih menyisakan suatu permasalahan dalam proses penirisannya. Untuk mengatasi masalah tersebut, maka diperlukan alat peniris minyak pada makanan (spinner) agar proses penirisan minyaknya dapat berjalan optimal. Alat peniris minyak pada makanan (spinner) ini dapat digunakan untuk meniriskan makanan sejenis keripik, kerupuk, makaroni, bawang goreng, dan sejenisnya. Adapun perancangan alat peniris minyak pada makanan ini dilakukan dalam beberapa tahapan yaitu tahap mengidentifikasi masalah dengan metode studi literatur, tahap pembuatan konsep dan cara kerja alat, tahap perhitungan, tahap pemilihan komponen sesuai dengan hasil perhitungan, dan tahap mendesain alat dan membuat gambar kerjanya. Berdasarkan hasil perancangan yang telah dilakukan, maka dihasilkan sebuah rancangan alat peniris minyak pada makanan (spinner) dengan spesifikasi dimensi rangka 560x300x300 mm. Motor penggerak yang digunakan adalah motor AC 4P/1200 rpm dengan sistem transmisi berupa puli dan sabuk V, serta poros transmisi yang berfungsi untuk menggerakkan tabung peniris. Alat peniris minyak pada makanan (spinner) ini dirancang memiliki kapasitas 2 kg, dengan dilengkapi pengatur putaran yang memiliki kecepatan maksimum 500 rpm dan kecepatan minimum Â±200 rpm, sehingga putaran tabung peniris dapat disesuaikan dengan kebutuhan.

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