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All Journal Rekayasa Mesin Makara Journal of Technology
Bondan T. Sofyan
Department of Metallurgy and Materials, Faculty of Engineering, Universitas Indonesia,
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering

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Modification of Bonding Strength Test of WC HVOF Thermal Spray Coating on Rocket Nozzle Sofyan, Bondan T.; Pardede, Haposan J.; Stefano, Marizki; Sofyan, Edi
Makara Journal of Technology Vol. 10, No. 1
Publisher : UI Scholars Hub

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Abstract

Modification of Bonding Strength Test of WC HVOF Thermal Spray Coating on Rocket Nozzle. One way to reduce structural weight of RX-100 rocket is by modifying the nozzle material and processing. Nozzle is the main target in weight reduction due to the fact that it contributes 30 % to the total weight of the structur. An alternative for this is by substitution of massive graphite, which is currently used as thermal protector in the nozzle, with thin layer of HVOF (High Velocity Oxy-Fuel) thermal spray layer. This paper presents the characterization of nozzle base material as well as the modification of bonding strength test, by designing additional jig to facilitate testing processes while maintaining level of test accuracy. The results showed that the material used for RX-100 rocket nozzle is confirmed to be S45C steel. Modification of the bonding strength test was conducted by utilizing chains, which improve test flexibility and maintains level of accuracy of the test.
KARAKTERISTIK MEKANIK DAN BALISTIK KOMPOSIT Al-8Zn-4Mg-20 VOL.% SiC HASIL PROSES SQUEEZE CASTING DAN PERLAKUAN PENUAAN Sabarati, Absaralita; Adhipura, Panji; Sofyan, Bondan T.
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1819

Abstract

Armoured Personnel Carrier (APC) as a means to support the mobility of TNI must have high toughness so that they are not easily penetrated by bullets. The APCs are commonly made of steel due to their excellent toughness and ballistic properties, however, it has a high density that reduces their mobility. Therefore, an alternative material is needed, which is lighter but remains tough. One option is Metal Matric Composites (MMC). This research studied a composite with Al-8Zn-4Mg alloy as the matrix and 20 vol. % SiC as the reinforcement. The composite was melted in a muffle furnace, stirred at 500 rpm, and squeeze-cast at the pressure of 20 tons. The samples were then solution-treated at 500°C for 1 h and aged at 200°C for up to 100 h. Characterization included hardness and impact testing, optical microscopy, and Scanning Electron Microscope - Energy Dispersive X-ray (SEM-EDX). The samples were then thermal coated by the High-Velocity Oxygen Fuel (HVOF) method using WC-Co particles. The coated samples underwent ballistic testing in accordance with NIJ 0108.01 standard by using a type III 7.56 mm caliber projectile. The results show that the hardness and impact energy increased with aging due to the formation of Mg2Si and Mg3Zn3Al2 precipitates. Peak hardness conditions after aging for 2 h generated hardness of 90,25 HRB and impact energy of 3 Joules. The composite plate failed and was penetrated by a type III 7.56 mm caliber projectile.
KARAKTERISTIK MEKANIK DAN BALISTIK KOMPOSIT Al-8Zn-4Mg-20 VOL.% SiC HASIL PROSES SQUEEZE CASTING DAN PERLAKUAN PENUAAN Sabarati, Absaralita; Adhipura, Panji; Sofyan, Bondan T.
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1819

Abstract

Armoured Personnel Carrier (APC) as a means to support the mobility of TNI must have high toughness so that they are not easily penetrated by bullets. The APCs are commonly made of steel due to their excellent toughness and ballistic properties, however, it has a high density that reduces their mobility. Therefore, an alternative material is needed, which is lighter but remains tough. One option is Metal Matric Composites (MMC). This research studied a composite with Al-8Zn-4Mg alloy as the matrix and 20 vol. % SiC as the reinforcement. The composite was melted in a muffle furnace, stirred at 500 rpm, and squeeze-cast at the pressure of 20 tons. The samples were then solution-treated at 500°C for 1 h and aged at 200°C for up to 100 h. Characterization included hardness and impact testing, optical microscopy, and Scanning Electron Microscope - Energy Dispersive X-ray (SEM-EDX). The samples were then thermal coated by the High-Velocity Oxygen Fuel (HVOF) method using WC-Co particles. The coated samples underwent ballistic testing in accordance with NIJ 0108.01 standard by using a type III 7.56 mm caliber projectile. The results show that the hardness and impact energy increased with aging due to the formation of Mg2Si and Mg3Zn3Al2 precipitates. Peak hardness conditions after aging for 2 h generated hardness of 90,25 HRB and impact energy of 3 Joules. The composite plate failed and was penetrated by a type III 7.56 mm caliber projectile.
Co-Authors Adhipura, Panji Christopher C. Berndt, Christopher Edi Sofyan, Edi Haposan J. Pardede, Haposan Marizki Stefano, Marizki Pardede, Haposan J. Sabarati, Absaralita