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All Journal JTT (Jurnal Teknologi Terpadu) SCIENCE TECH: Jurnal Ilmiah Ilmu Pengetahuan dan Teknologi Jurnal Polimesin
Besse Titing Karmiati
Universitas Jenderal Achmad Yani
Agriculture, Biological Sciences & Forestry Automotive Engineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering

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Pengaruh Variasi Ketinggian Chamber pada Proses Gas Atomisasi dengan Nozel 45° terhadap Distribusi Ukuran Serbuk ADC12 Pawawoi Pawawoi; Ressy Noor Rafiq; Besse Titing Karmiati; Naufal Dhiya'ulhaq; Sabrina Maharani Julanov
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 12 No 1 (2026): February
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/st.vol12.no1.a20631

Abstract

The gas atomization process is widely used to produce aluminum alloy powder with controlled particle size distribution and morphology. This study aims to analyze the effect of variations in the height of the atomization chamber (80 cm, 120 cm, and 160 cm) in the gas atomization process using a fixed nozzle at a 45° angle on the size distribution of ADC12 powder. ADC12 alloy was melted at 750 °C, then atomized using compressed air at a pressure of 8 bar and argon gas at a pressure of 20 bar. The results showed that variations in the height of the atomization chamber affected the powder production efficiency and particle size distribution. The powder production efficiency was in the range of 76.72%–98.95%, with the highest value at a height of 80 cm. Changes in the height of the atomization chamber affected the droplet flight time and solidification behavior, resulting in differences in particle size distribution. The fraction of powder <100 µm was only 0.99%, indicating the limitation of fine particle formation under the process conditions used. Morphological analysis using SEM showed spherical, tear drop, rounded, dan irregular shaped particles, with the dominant spherical particles in the size range of 60.7–95.3 µm. These results confirm that the height of the atomization chamber plays an important role in controlling the dynamics of fragmentation and solidification of droplets during the ADC12 gas atomization process with a 45° nozzle.
Green synthesis of hydroxyapatite from eggshells using orange peel (Citrus sinensis) as a template for bioceramic Manty Aldilani Ikaningsih; Wahyu Hidayat; Wirawan Piseno; Lulu Nurdini; Besse Titing Karmiati; Arif Rahman; Ba’adilla Akhista Gamara
Jurnal Polimesin Vol 24, No 2 (2026): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i2.8645

Abstract

This study addresses the environmental challenge posed by chicken eggshell and orange peel waste by developing a sustainable green synthesis route for hydroxyapatite (HAp). This work aimed to synthesize hydroxyapatite from eggshell-derived calcium using orange peel (Citrus sinensis L.) extract as a natural template and to evaluate the effect of extract concentration on the structural and morphological characteristics of the resulting material. Hydroxyapatite was synthesized via a wet-chemical precipitation method under alkaline conditions using orange peel extract at concentrations of 0%, 10%, 20%, and 30%. X-ray diffraction analysis confirmed hydroxyapatite as the dominant crystalline phase in all samples, with crystallinity values of 100%, 99.55%, 95.6%, and 95.2% for extract concentrations of 0%, 10%, 20%, and 30%, respectively, indicating controlled reduction in crystallite size with increasing extract concentration. Scanning electron microscopy revealed a progressive reduction in particle size, decreased agglomeration, and enhanced surface porosity, while energy-dispersive X-ray spectroscopy confirmed consistent elemental composition and high purity. Among the investigated conditions, the use of 30% orange peel extract produced the most favorable overall characteristics, combining refined microstructure and controlled crystallinity.
PERANCANGAN RANGKA MESIN CNC ROUTER SEBAGAI ALAT PENUNJANG DALAM PEMBUATAN POLA CETAKAN PADA PENGECORAN LOGAM SKALA LABORATORIUM Ressy Noor Rafiq; Besse Titing Karmiati; Manty Aldilani Ikanigsih; Lulu Nurdini; War An Rosihan
Jurnal Teknologi Terpadu Vol 14 No 1 (2026): JTT (Jurnal Terpadu Terpadu)
Publisher : Pusat Penelitian dan Pengabdian Kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32487/jtt.v14i1.2874

Abstract

The development of the metal casting industry requires technology capable of producing products with complex shapes and high precision. This study focuses on the design and analysis of the CNC Router machine frame on a laboratory scale to support mold pattern fabrication in metal casting practicals at Jenderal Achmad Yani University. The frame, constructed from aluminum profile 2040 and ABS material, was analyzed using the Finite Element Method (FEM) through SolidWorks Simulation to evaluate stress distribution, safety factor, and total deformation. The simulation results show a maximum Von Mises stress of 0.1771 MPa, a maximum safety factor of 15, and a maximum total deformation of 0.001409 mm. These results indicate that the designed frame possesses excellent strength, rigidity, and stability under operational loads. Therefore, the CNC Router frame is feasible for manufacturing and can support efficient, technology-based metal casting practicals.
Co-Authors Arif Rahman Ba’adilla Akhista Gamara Lulu Nurdini Manty Aldilani Ikanigsih Manty Aldilani Ikaningsih Naufal Dhiya'ulhaq Pawawoi, Pawawoi Ressy Noor Rafiq Sabrina Maharani Julanov Wahyu Hidayat War An Rosihan Wirawan Piseno