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All Journal Semesta Teknika Emerging Science Journal Civil Engineering Journal METAL : Jurnal Sistem Mekanik dan Termal
Hammar Ilham Akbar
Department Of Mechanical Engineering, Universitas Sebelas Maret, Surakarta, 57126,
Automotive Engineering Civil Engineering, Building, Construction & Architecture Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Analisis Artificial Aging dan Perlakuan Electroless Coating Terhadap Karakteristik Gesek dan Kekerasan Komposit AA6061-Al2O3 Hanif Rinaldi; Eko Surojo; Teguh Triyono; Hammar Ilham Akbar
Semesta Teknika Vol 25, No 1 (2022): MEI 2022
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v25i1.13448

Abstract

Komposit merupakan bahan rekayasa yang terdiri dari dua bahan yaitu matrik dan penguat. Komposit matriks aluminium merupakan salah satu jenis komposit matriks logam yang banyak digunakan dalam dunia otomotif dan konstruksi. Penelitian ini menggunakan AA6061 dan Al2O3 yang bertujuan untuk mengetahui pengaruh perlakuan panas dan electroless coating terhadap karakteristik gesek dan kekerasan komposit AA6061-Al2O3. Pembuatan komposit menggunakan metode stir casting. Perlakuan panas dilakukan dalam tiga tahap. Variasi dari penelitian ini adalah waktu penahanan yaitu 2-6 jam. Waktu penahanan optimum pada proses artificial aging terjadi pada 4 jam. Hasil pengujian menunjukkan bahwa kombinasi perlakuan electroless coating pada partikel dan 4 h artificial aging menghasilkan kekerasan tertinggi 56,70 BHN, koefisien gesek 0,543 dan keausan spesifik terendah 1,25x10-4 mm3/Nm. Hasil karakterisasi gesekan dan pengujian kekerasan membuktikan bahwa perlakuan electroless coating efektif dalam meningkatkan kekerasan dan karakteristik gesekan yang unggul pada komposit AA6061-Al2O3.
Pengaruh Media Pendingin pada Perlakuan Panas T6 terhadap Kekuatan Tarik dan Struktur Mikro Komposit Al6061-Pasir pantai Hafidh Rawi Mufti; Hammar Ilham Akbar; Eko Surojo; Wibowo Wibowo; Teguh Triyono; Sukmaji Indro Cahyono; Nurul Muhayat; Triyono Triyono
METAL: Jurnal Sistem Mekanik dan Termal Vol 5, No 2 (2021): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1011.197 KB) | DOI: 10.25077/metal.5.2.51-59.2021

Abstract

Al6061-sea sand composite was manufactured using the stir casting method and its mechanical properties were improved by heat treatment. The T6 heat treatment used to improve the mechanical properties of the composite consists of the following processes: solution heat treatment, quenching, and artificial aging. The solution heat treatment process was carried out at a temperature of 540oC for 6 hours. The quenching process was carried out with different quenching agents (water, oil, and 10% brine). The difference in quenching agents resulted in different cooling rates. After quenching, an artificial aging process was carried out at a temperature of 200 oC for 4 hours. The difference in cooling rate affects the hardness and tensile strength of the specimen. The high cooling rate results in an increase in the tensile strength of the specimen. This is due to the increase in cooling speed, the Mg2Si precipitates formed are smaller in size and located in the grains. The highest tensile strength of specimen (206.67 MPa) is obtained by using brine quenching agent.
Effects of Stir Casting Baffles on Hardness and Microstructure: Investigation of Designed Aluminum Composites Eko Surojo; Hammar Ilham Akbar; Dody Ariawan; Aditya Rio Prabowo; Teguh Triyono; Fahmi Imanullah
Civil Engineering Journal Vol 8, No 8 (2022): August
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2022-08-08-04

Abstract

The increasing demand for lightweight material specifications has forced researchers to develop lightweight materials that are inexpensive, can be produced on a large scale, and are environmentally friendly. One solution that has been developed is an aluminum composite reinforced with sea sand. Indonesia has the second longest coastline in the world, which means that the country is rich in maritime resources, one of which is sea sand. The ceramic contents of SiO2, SiC, and Al2O3allow sea sand to be used as a reinforcement in aluminum composites for engineering purposes. The most effective manufacturing method of AA6061–sea sand composites is stir casting, but the homogeneity and distribution of particles are the main disadvantages of the stir casting method. Various factors affect particle distribution and homogeneity, one of which is the flow during the stirring process. The increase in turbulent flow in the stirring process affects the homogeneity and distribution of the particles. One way to create a turbulent flow when stirring is to add baffles. This paper examines the effect of adding baffles during the stir casting process on the mechanical properties of AA6061–sea sand composites. The mechanical properties of AA6061–sea sand composites were characterized using the Brinell hardness test according to ASTM E-10. The test results show that the addition of baffles during the stir casting process decreases the hardness of the AA6061–sea sand composites due to the turbulent flow that occurs. This makes the material more porous, which makes the AA6061–sea sand composites less hard. Doi: 10.28991/CEJ-2022-08-08-04 Full Text: PDF
Tribological Performance of Polymer Composite Modified with Calcined Eggshell Particles Post High-Temperature Exposure Sunardi Sunardi; Dody Ariawan; Eko Surojo; Aditya Rio Prabowo; Tohid Ghanbari-Ghazijahani; Cahyo Hadi Wibowo; Hammar Ilham Akbar
Emerging Science Journal Vol 8, No 4 (2024): August
Publisher : Ital Publication

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/ESJ-2024-08-04-03

Abstract

During operation, brake lining material rubs against the disc to generate heat. This heat could decrease the brake lining performance, such as the friction coefficient, specific wear rate, and interface temperature of the rubbing surfaces. The resulting wear debris is environmentally harmful and poses risks to human health. Therefore, this study aimed to replace the harmful material using eggshell particles as a filler in brake lining composite and enhance tribological properties. The brake lining samples were manufactured through three stages: cold compaction, hot compaction, and post-curing. The next step is the samples were subjected to a one-hour high-temperature exposure at 200°C, 300°C, 400°C, and 500°C. The results showed that the high-temperature exposure significantly affected the specific wear rate, friction coefficient, and interface temperature between the brake lining and disc. An interesting finding was that adding calcined eggshell particles in composite could improve the tribological properties up to 400°C. However, the best material’s performance resulted when the samples got an exposure temperature of 200°C. Doi: 10.28991/ESJ-2024-08-04-03 Full Text: PDF
Co-Authors Aditya Rio Prabowo Cahyo Hadi Wibowo Dody Ariawan Eko Surojo Eko Surojo Eko Surojo Eko Surojo Fahmi Imanullah Hafidh Rawi Mufti Hanif Rinaldi Muhayat, Nurul Sukmaji Indro cahyono Sunardi Sunardi Teguh Triyono Teguh Triyono Teguh Triyono Tohid Ghanbari-Ghazijahani Triyono Triyono Wibowo Wibowo