Pengaruh Ukuran Partikel Dan Komposisi Si3n4-Y2o3/Al2o3 Sebagai Skin Barrier Terhadap Sifat Thermal Dan Daya Lekat Pada Substrat GFRP

Catherine, Prita Laura (2025) Pengaruh Ukuran Partikel Dan Komposisi Si3n4-Y2o3/Al2o3 Sebagai Skin Barrier Terhadap Sifat Thermal Dan Daya Lekat Pada Substrat GFRP. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Material komposit berbasis polimer terus dikembangkan untuk aplikasi di bidang antariksa karena memiliki kekuatan mekanik tinggi dan ketahanan termal yang baik. Namun, material ini memiliki keterbatasan karena matriks polimernya cenderung terdegradasi pada suhu sekitar 230°C, terutama dalam kondisi ekstrem. Oleh karena itu, diperlukan pelapis termal untuk melindungi Glass Fiber Reinforced Polymer (GFRP) dalam aplikasi tersebut. Dalam penelitian ini, material pelapis berbasis silicon nitride (Si₃N₄) dengan aditif alumina (Al₂O₃) dan yttrium oxide (Y₂O₃) serta binder sodium silicate diaplikasikan pada substrat GFRP. Campuran ini dibuat dalam bentuk slurry. GFRP dibuat melalui metode Vacuum Assisted Resin Transfer Molding (VARTM). Lapisan diterapkan menggunakan metode Doctor Blade Coating dengan variasi ukuran butir Si₃N₄-Al₂O₃/Y₂O₃ (300, 400, dan 500 mesh) dan komposisi Si₃N₄-Al₂O₃/Y₂O₃ (92-3/5%, 90-5/5%, dan 88-7/5%). Setelah proses pelapisan, spesimen mengalami sintering pada suhu 100°C selama 5 jam. Pengujian dilakukan untuk mengkarakterisasi daya lekat dan ketahanan termal lapisan, meliputi Pull-Off Test, X-Ray Diffraction (XRD), Thermogravimetric Analysis (TGA), Scanning Electron Microscopy – Energy Dispersive X-Ray (SEM-EDX), pengujian densitas, dan pengujian thermal torch. Hasil penelitian menunjukkan bahwa komposisi Y₂O₃ dan ukuran butir mempengaruhi ketahanan termal dan daya lekat lapisan. Lapisan dengan komposisi Si₃N₄-Al₂O₃/Y₂O₃ sebesar 88-7/5% dan ukuran butir 300 mesh menunjukkan ketahanan termal terbaik, dengan penurunan suhu 611°C dan kehilangan massa sebesar 10,426%. Selanjutnya, lapisan dengan komposisi yang sama dan ukuran butir 500 mesh menunjukkan daya lekat terbaik, dengan nilai penurunan suhu 503°C dan kehilangan massa sebesar 26,805%.
Kata Kunci : Silika nitrida, coating, ketahanan termal, daya lekat
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Polymer-based composite materials continue to be developed for applications in the aerospace field because they have high mechanical strength and good thermal resistance. However, this material has limitations because its polymer matrix tends to degrade at temperatures around 230°C, especially under extreme conditions. Therefore, a thermal coating is needed to protect Glass Fiber Reinforced Polymer (GFRP) in these applications. In this study, a coating material based on silicon nitride (Si₃N₄) with alumina (Al₂O₃) and yttrium oxide (Y₂O₃) additives and sodium silicate binder was applied to a GFRP substrate made using the Vacuum Assisted Resin Transfer Molding (VARTM) method. The coating was applied using the Doctor Blade Coating method with variations in Si₃N₄-Al₂O₃/Y₂O₃ grain size (300, 400, and 500 mesh) and Si₃N₄-Al₂O₃/Y₂O₃ composition (92-3/5%, 90-5/5%, and 88-7/5%). After the coating process, the specimens were sintered at 100°C for 5 hours. Tests were conducted to characterize the adhesion and thermal resistance of the coating, including through Pull-Off Test, X-Ray Diffraction (XRD), Thermogravimetric Analysis (TGA), Scanning Electron Microscopy – Energy Dispersive X-Ray (SEM-EDX), density testing, and thermal torch testing. The results showed that the composition of Y₂O₃ and grain size affected the thermal resistance and adhesion of the coating. The coating with Si₃N₄-Al₂O₃/Y₂O₃ composition of 88-7/5% and grain size of 300 mesh showed the best thermal resistance, with a temperature drop of 611°C and a mass loss of 10.426%. On the other hand, the coating with the same composition and grain size of 500 mesh showed the best adhesion, with a temperature drop of 503°C and a mass loss of 26.805%.
Keyword : Silika Nitrida, Coating, Stabilitas thermal, Adhesion strength

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Silika Nitrida, Coating, Stabilitas thermal, Adhesion strength, Silika nitrida, coating, ketahanan termal, daya lekat
Subjects:	T Technology > T Technology (General)
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User:	Prita Laura Catherine
Date Deposited:	23 Jan 2025 07:46
Last Modified:	23 Jan 2025 07:46
URI:	http://repository.its.ac.id/id/eprint/116755

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