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All Journal Jurnal Spektra INSIST (International Series on Interdisciplinary Research) Journal of Engineering and Scientific Research (JESR)
Dwi Gustiono, Dwi
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PENGAMATAN STUKTUR MIKRO PERMUKAAN BAJA YANG DIIRRADIASI ION TITANIUM MENGGUNAKAN TEM Gustiono, Dwi
Jurnal Spektra Vol 15, No 1 (2014): Spektra: Jurnal Fisika dan Aplikasinya
Publisher : Jurnal Spektra

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Abstract

Telah dilakukan pengamatan mikrostruktur permukaan material baja yang diiradiasi ion titanium pada suhu ruang  menggunakan mikroskop elektron transmisi (transmission electron microscope/TEM). Pada dosis irradiasi rendah, mikrostruktur permukaan baja banyak dipenuhi oleh cacat titik, cacat bidang dan dislokasi. Seiring dengan meningkatnya  dosis irradiasi terjadi perubahan mikrostruktur pada beberapa bagian atau daerah permukaan material baja yang semula  kristalnya berstruktur kubus berpusat muka (face centered cubic/ fcc) menjadi kubus berpusat badan (body centered cubic/bcc). Bagian permukaan yang mengalami perubahan struktur kristal karena proses irradiasi ion titanium ini memiliki bentuk melingkar seperti partikel dan memiliki ukuran luas yang beragam dari skala nano hingga mikron. Pengamatan penampang lintang memperlihatkan bahwa daerah bcc terinduksi irradiasi ini hanya terjadi pada daerah dekat permukaan sekitar 150 nm dari permukaan material baja. Keywords: Perubahan struktur kristal, irradiasi-ion, implantasi-ion, baja, mikroskop elektron.
Synthesis and Characterizations of Hydroxyapatite from Bovine Bone Using Alkaline Hydrolysis Method Aisah, Nuning; Harahap, Muslim Efendi; Budianto, Dwi; Wibowo, Mirza; Effendi, Mohammad Dachyar; Setiawan, Jan; Roseno, Seto; Gustiono, Dwi
International Series on Interdisciplinary Science and Technology Vol. 3 No. 1 (2018)
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/ins.v3i1.124

Abstract

In this research, the synthesis of hydroxyapatite compound (HAp) has been done by extracting technique from cow cortex thigh bones to eliminate organic compounds contained in bone so that it can be used as raw material of bone graft. The method used is alkaline hydrolysis method of soaking bone in NaOH solution with variation of concentration (1M, 2M, 3M) and immersion time (30 minutes, 60 minutes, 90 minutes). The extracted HAp powder was then analyzed using FTIR, XRD and SEM. The results showed that a hydroxyapatite powder with a soaking time of 30 minutes and a 2M and 3M NaOH concentration did not contain organic elements. The XRD peak pattern shows the phase formed is a hydroxyapatite with a hexagonal structure having an average crystal size of 10-12 nm.
The Effect of Sodium Hydroxide Concentration on Physical and Mechanical Properties of Magnesium AZ31 Coating for Biodegradable Bone Implant Application Safii, Rizal N; Wicaksono, Mahruri Arif; Gustiono, Dwi; Sukmana, Irza; Sugiyanto, Sugiyanto
Journal of Engineering and Scientific Research Vol. 5 No. 2 (2023)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jesr.v5i2.148

Abstract

Anodizing is a metal coating technique by converting a metal surface to form an oxide layer by electrolysis, one of which is to increase the hardness of a material. This research was carried out to know the effect of variations in electrolyte solution on the hardness of the coating resulting from the anodizing process. The electrolyte used is a solution of NaOH (Sodium Hydroxide) with a concentration of 1 M solution of 68% purity. The specimen used is magnesium AZ31, voltage 10 Volts, soaking time 10 minutes at room temperature. Based on the data analysis results, the magnesium layer's hardness value at 10 minutes at a voltage of 10 volts is 69 HV.In comparison, the coating thickness result at 10 minutes with a constant voltage of 10 volts is 6 ?m. While the concentration of the solution is 0.5 M, the purity is 68%. The specimen used is magnesium AZ31, voltage 10 Volts, soaking time 10 minutes at room temperature. Based on the results of data analysis, the hardness value of the magnesium layer at 10 minutes at a voltage of 10 volts is 67 HV. In comparison, the coating thickness at a time of 10 minutes with a constant voltage of 10 volts is 4 ?m. With variations in stress and time in different concentrations of the solution, there will be differences in the hardness value and thickness value of the AZ31 magnesium coating material.
Co-Authors Aisah, Nuning Budianto, Dwi Effendi, Mohammad Dachyar Harahap, Muslim Efendi Irza Sukmana, Irza Jan Setiawan Safii, Rizal N Seto Roseno Sugiyanto - Wibowo, Mirza Wicaksono, Mahruri Arif