Munada, Dimas Ilham (2024) Analisis Pengaruh Persentase Ni60/SiO2 dan Lingkungan Oksidasi terhadap Struktur Mikro dan Sifat Mekanik Pelapisan Flame Spray pada Stainless Steel 304. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Kegagalan temperatur tinggi akibat deposit alkali klorida menjadi permasalahan utama tube boiler biomassa, sehingga dibutuhkan proteksi melalui pelapisan material dengan ketahanan temperatur tinggi dan sifat mekanik yang baik. Penelitian ini menganalisis pengaruh persentase (wt%) serbuk Ni60/SiO2 dengan variasi 100/0, 95/5, 90/10, 85/15 yang dideposisikan dengan metode flame spray pada substrat baja SS304 dan dioksidasi pada temperatur 650 oC di lingkungan ambien dengan penambahan deposit KCl. Hasil pelapisan dianalisis dengan pengujian metalografi, SEM/EDS, XRD, pull off, dan pin-on-disc. Deposit KCl menginduksi mekanisme oksidasi aktif dengan menghasilkan gas klorin yang mempenetrasi celah lapisan sehingga mempercepat oksidasi. SiO2 berperan menginisiasi pertumbuhan butir dan efek pengisi yang menghambat difusi sehingga mempromosikan terbentuknya lapisan oksida protektif. Spesimen Ni60-5Si (variasi serbuk Ni60/SiO2 dengan persentase (wt%) 95/5) menunjukkan struktur lapisan dan interface yang paling baik. Spesimen Ni60-5Si memiliki nilai laju pembentukan oksida terendah setelah oksidasi tanpa dan dengan deposit KCl sebesar 3,45 ± 0,56 dan 6,71 ± 0,28 mg/cm2. Spesimen Ni60-5Si memiliki ketahanan aus paling baik dengan wear rate setelah oksidasi tanpa dan dengan deposit KCl sebesar 1,64 dan 2,05 (10-4 mm3/N.m). Spesimen Ni60-5Si memiliki nilai adhesivitas tertinggi lapisan as sprayed dan setelah oksidasi sebesar 4,89 dan 9,72 MPa.
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High temperature failure due to alkali chloride deposit is the main problem of biomass boiler tubes, so protection is needed using coating materials with high temperature resistance and good mechanical properties. This study analyzed the effect of percentage (wt%) Ni60/SiO2 powder with variations of 100/0, 95/5, 90/10, 85/15 deposited by flame spray method on SS304 steel substrate and oxidized at 650 oC in ambient environment with KCl deposit. The coating results were analyzed by metallography, SEM/EDS, XRD, pull off, and pin-on-disc testing. The KCl deposit induces an active oxidation mechanism by generating chlorine gas that penetrates the coating gap, thus accelerating oxidation. SiO2 plays the role of initiating grain growth and filler effects that prevent diffusion thereby promoting the formation of a protective oxide layer. Ni60-5Si specimen (Ni60/SiO2 powder variation with a percentage (wt%) of 95/5) showed the best coating structure and interface. Ni60-5Si specimen had the lowest oxide formation rate after oxidation without and with KCl deposit of 3.45 ± 0.56 and 6.71 ± 0.28 mg/cm2. Ni60-5Si specimen had the best wear resistance with wear rates after oxidation without and with KCl deposit of 1.64 and 2.05 (10-4 mm3/N.m). Ni60-5Si specimen had the highest adhesivity values of as sprayed coating and after oxidation with 4.89 and 9.72 MPa.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Flame Spray, Ni60, Oksidasi, Sifat Mekanik, SiO2, Mechanical Properties, Oxidation |
| Subjects: | T Technology > TN Mining engineering. Metallurgy > TN690 Metallography. Physical metallurgy T Technology > TN Mining engineering. Metallurgy > TN752.I5 Steel--Heat treatment T Technology > TS Manufactures > TS699 Powder coating of metals |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | DIMAS ILHAM MUNADA |
| Date Deposited: | 02 Aug 2024 02:43 |
| Last Modified: | 02 Aug 2024 02:43 |
| URI: | http://repository.its.ac.id/id/eprint/110978 |
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