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All Journal Journal of the Medical Sciences (Berkala Ilmu Kedokteran) Jurnal Simetris Indonesian Journal of Cancer Emerging Science Journal Civil Engineering Journal Indonesian Journal of Clinical Pathology and Medical Laboratory (IJCPML) JURNAL ILMIAH MAKSITEK Abdi Masya Jurnal Abdikarya : Jurnal Karya Pengabdian Dosen dan Mahasiswa JKKI : Jurnal Kedokteran dan Kesehatan Indonesia Indonesian Journal of Cancer IJRETINA - International Journal of Retina
Teguh Triyono
Department Of Clinical Pathology, Faculty Of Medicine, Public Health, And Nursing, Universitas Gadjah Mada-Dr. Sardjito General Hospital, Yogyakarta, Indonesia
Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Mechanical Engineering Medicine & Pharmacology Neuroscience Public Health Social Sciences Other

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Effect of Cu and SiO₂ on a Remelted-Recycled Piston Alloy Under Vertical Centrifugal Casting Conditions Triyono, Teguh; Surojo, Eko; Prabowo, Aditya Rio; Triyono, Triyono; Djordjevic, Branislav; Carvalho, Hermes; Adie, Prayoga Wira; Sholehuddin, Muhammad Ilham
Civil Engineering Journal Vol. 12 No. 1 (2026): January
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2026-012-01-020

Abstract

Functionally graded aluminum matrices produced by means of centrifugal casting offer a route to location-specific properties, yet sustainable feedstocks and dual-density reinforcements are less well explored. In this work, we evaluate vertical centrifugal casting (VCC) of a remelted, recycled piston alloy reinforced with silica (SiO₂) and copper (Cu) particulates selected for their contrasting densities relative to the matrix. Castings were produced at 1000 rpm for 5 minutes using a 500 °C preheated mold and an 800 °C pour temperature. Cu was added at 1–4 wt.% and SiO₂ was added at 0–9 wt.%. Bulk density/porosity measurements, Vickers hardness testing, and optical/SEM microstructural analysis were employed to characterize the resulting gradients. The density increased with the radial distance from the rotation axis, accompanied by a monotonic decrease in porosity, consistent with centrifugal separation. Microstructurally, SiO₂ concentrated toward the inner region near the rotation center; in comparison, Cu was enriched at the outer periphery. Correspondingly, hardness exhibited a spatial gradient: SiO₂-reinforced zones were hardest near the inner region, whereas Cu-rich outer zones were hardest at the external rim. These results demonstrate that VCC of a recycled Al–Si feedstock can be used to reliably tailor its microstructure and properties through density-driven particle segregation, enabling controllable, bidirectional functional grading using environmentally friendly starting materials.
Co-Authors Abdul Salam Sofro Adie, Prayoga Wira Aditya Rio Prabowo Aditya Wicaksana Agiel, Raiddin Muhamad Agni, Angela Nurini Akbar, Hammar Ilham Anak Agung Wiradewi Lestari Andri Christianalusi Bambang Margono Budi Mulyono Budi Mulyono Caesar Haryo Bimoseno Carvalho, Hermes Chamim, Moch. David Dwi Putera DIAN A.P PURWANTO Djordjevic, Branislav Eko Surojo ENDANG YUNIASTUTI Fridawati, Veronica Fuad Anshori Hanifah, Shabrina Hans Vrielink Harjo Seputro, Harjo Harsito, Catur Ilham Habibi, Ilham Indra Tri Mahayana Jarir At Thobari Johan Kurnianda Jonliberti Purba Kaslam, Surawijaya Bakhtiar Majid, Faishal M. Mardiah Suci Hardianti Muhammad Luthfi Neti Nurani Ni Kadek Mulyantari Nurul Muhayat Pramudi, Ganjar Prita Murani Nugraheti PURWANTO, DIAN A.P Raehanul Bahraen Raharjo, Wijang W. Sholehuddin, Muhammad Ilham Singgih Dwi Prasetyo Sri Mulatsih Sri Mulatsih Suhardjo Suhardjo Sukmaji Indro Cahyono, Sukmaji Indro Surawijaya Bakhtiar Kaslam Sutaryo Sutaryo Syahru Agung Setiawan Tri Ratnaningsih Triyono Triyono Triyono Ubaidillah Ubaidillah Umi Solekhah Intansari Usi Sukorini Veronica Fridawati Wijang Wisnu Raharjo Zainal Arifin