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All Journal LONTAR Jurnal Teknik Mesin Undana (LJTMU )
Erich U. K. Maliwemu
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Mechanical Engineering

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ANALISIS FASA KRISTALIN PADA TULANG SAPI TIMOR DENGAN VARIASI WAKTU DAN TEMPERATUR PEMANASAN DENGAN PENGUJIAN XRD raymundus rheymon soko; Erich U. K. Maliwemu; Dominggus G. H. Adoe
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 12 No 02 (2025): Oktober 2025
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v12i02.18033

Abstract

The aim of this research is to identify the crystalline phase of Timor cattle bone powder and characterize it using XRD (X-Ray Diffraction) testing. This research uses a method of analyzing the results of XRD (X-Ray Diffraction) of Timor beef bones with variations in heating time and temperature. After the beef bones have been ground, the sample is oven-treated for 1 and 2 hours at a temperature of 1000C, then 5 grams of the sample is taken for testing using XRD (X-Ray Diffraction). The research results show that a 1 hour time variation at a temperature of 100 0C has a purity level of 84.07% with a diameter of 32.81 mm, and a crystallinity of 85.1%. And a time variation of 2 hours at a temperature of 1000C has a purity level of 76.68% with a diameter of 31.97 nm, and a crystallinity of 98.0%.
PENGARUH WAKTU DAN TEMPERATUR HIDROTERMAL TERHADAP HASIL UJI XRD HIDROKSIAPATIT DARI CANGKANG KERANG ALE-ALE AGUSTO BRIA SERAN; Erich U. K. Maliwemu; Dominggus G. H. Adoe
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 12 No 01 (2025): April 2025
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v12i01.20042

Abstract

This study aims to analyze the changes in chemical composition and phase of ale-ale shells through X-Ray Diffraction (XRD) tests with variations in temperature and oven time. Ale-ale shell samples obtained from Oesapa Beach, Kupang, East Nusa Tenggara, were processed through the preparation, heating, and characterization stages using XRD. Testing was carried out at temperatures of 500°C and 700°C with variations in heating time of 2, 4, and 6 hours. The results of the XRD test showed phase changes in samples heated at a temperature of 500°C, where in samples with a time of 6 hours decomposition occurred into CaO with a purity level of 53.4%. At a temperature of 700°C, samples heated for 2 hours showed a purity of 53.3%, and at 6 hours the purity reached 48.2%. All samples showed diffraction peaks indicating 100% calcite content. These results provide an understanding of the changes in the crystal structure and purity of ale-ale shell material, which can be used in biomaterial applications, especially for bone graft materials.
Pengaruh Perlakuan Karburising Menggunakan Arang Kayu Kusambi Terhadap Kekerasan Material Pada Spesimen Tooth Bucket Excavator Mohammad Fadel; Erich U. K. Maliwemu; Yeremias M Pell
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 13 No 01 (2026): April 2026
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v13i01.19244

Abstract

The aim of this research is to determine the effect of carburizing using kusambi charcoal on the hardness of Excavator Bucket Tooth. An excavator is a piece of heavy equipment that is often used in various types of projects to carry out various projects such as loading and unloading asphalt, digging soil and is also used in the mining world for digging. This research was conducted at the Kupang State Polytechnic campus from May to June 2024, using tools such as a furnace, electric grinder, microscope, hardness testing equipment, 60 mesh sieve, carburizing box and the materials used were an excavator tooth bucket and kusambi charcoal powder. . This research uses 2 tests, namely Vickers hardness testing and microstructure testing. In the Vickers hardness test, the average hardness value for each media variation was the best with a hardness treatment of 130 grams with an average hardness value of 36 VHN. Meanwhile, in the microstructure test with 130 grams of pearlite treatment, the pearlite structure increased and the grain size began to even out along the penetration, although there was still a lot of ferrite on the pearlite side.
Co-Authors AGUSTO BRIA SERAN Dominggus Godlief Heryson Adoe Mohammad Fadel raymundus rheymon soko Yeremias M Pell