Analisis Pengaruh Heat Treatment Dan Penambahan Aluminium Pada Arc Spray Coating Wire NiCrBMoCSiFe Pada Permukaan Water Wall CFB Boiler

Bancin, Joel Carlos Hasudungan (2026) Analisis Pengaruh Heat Treatment Dan Penambahan Aluminium Pada Arc Spray Coating Wire NiCrBMoCSiFe Pada Permukaan Water Wall CFB Boiler. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Boiler Circulating Fluidized Bed atau CFB dioperasikan dengan pembakaran batubara sebagai sumber utama, untuk memanaskan water wall boiler pada sekitar ruang pembakaran. Pembakaran batu bara disertai proses flyash yang berlangsung secara kontinu selama operasi boiler CFB, sehingga abrasi pada permukaan wall disebabkan dan risiko terjadinya cartridge ditingkatkan apabila perbaikan tidak dilakukan. Heat treatment pada coating NiCrBMoCsiFe, dan heat treatment pada coating NiCrBMoCsiFe dengan tambahan aluminium dengan metode Arc spray coating diterapkan, guna untuk membentuk intermetalik Nikel dan Aluminium yang lebih kuat, serta menurunkan porositas, meningkatkan kekerasan dan kekuatan ikat atau bond strength coating terhadap water wall. Pengaruh perlakuan panas dengan variasi suhu 700°C, 800°C, dan 900°C dianalisis melalui identifikasi fasa intermetalik pada coating NiCrBMoCsiFe (SP 242) dan NiCrBMoCsiFe (SP 242) yang ditambahkan aluminium (W 375) menggunakan X-ray Diffraction (XRD), sedangkan pengukuran presentase porositas dan persebaran unsur diukur dengan Scanning Electron Microscope (SEM) EDX Mapping pada cross section coating. Hasil dari pengujian SEM EDX mapping dan XRD memengaruhi nilai kekerasan coating melalui pengujian Microhardness Vickers, serta kekuatan adhesi atau bond strength coating pada substrat. Fasa yang berperan meningkatkan kekerasan dan kekuatan adhesi coating seperti Ni2B dan Ni40Cr42Mo18 pada coating SP 242, serta fasa Ni2Al3 dan Cr23C6 pada coating SP 242 mix W 375 teridentifikasi melalui pengujian karakterisasi XRD. Presentase porositas sebesar 0,15% ditemukan pada coating SP 242 tanpa heat treatment dan 0,08 % pada coating SP 242 dengan heat treatment 900°C, 0,005% porositas pada coating SP 242 mix W 375 tanpa heat treatment, dan 0,01% porositas ditemukan pada coating SP 242 mix W 375 tanpa heat treatment melalui pengujian SEM. Persebaran unsur Nikel, Boron, Kromium, Molibdenum, Karbon, dan Aluminium pada coating SP 242 dan SP 242 mix W 375 sebagai data pendukung XRD, terdeteksi melalui pengujian EDX dan mapping. Pada coating wire SP 242, kekerasan tertinggi 922,5 HV pada variasi temperatur heat treatment 900°C Pada coating SP 242 mix W 375, mencapai kekerasan 1010,5 HV pada heat treatment variasi 700°C. Pada hasil pengujian pull off test, variasi SP 242 dengan tanpa heat treatment memiliki bond strength tertinggi senilai 26,8 Mpa, dan pada SP 242 mix W 375 dengan variasi heat treatment 800°C senilai 29,6 Mpa. Maka, telah disimpulkan bahwa pada coating SP 242 dengan heat treatment 900°C dan coating SP 242 mix W 375 dengan heat treatment 800°C, memiliki hasil karakterisasi dan pengujian mekanik yang lebih unggul.
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The Circulating Fluidized Bed (CFB) boiler is operated by burning coal as the main source ofenergy to heat the water wall boiler around the combustion chamber. Coal combustion is accompanied by a continuous fly ash process during CFB boiler operation, causing abrasion on the wall surface and increasing the risk of cartridge failure if repairs are not carried out. Heat treatment on NiCrBMoCsiFe coating and heat treatment on NiCrBMoCsiFe coating with aluminum addition using the arc spray coating method were applied to form stronger nickel and aluminum intermetallic compounds, as well as to reduce porosity and increase the hardness and bond strength of the coating to the water wall. The effect of heat treatment at temperatures of 700°C, 800°C, and 900°C was analyzed through the identification of intermetallic phases in NiCrBMoCsiFe (SP 242) and NiCrBMoCsiFe (SP 242) coatings with added aluminum (W 375) using X-ray Diffraction (XRD). while the measurement of porosity percentage and element distribution was measured with Scanning Electron Microscope (SEM) EDX Mapping on the coating cross section. The results of SEM EDX mapping and XRD testing affect the hardness value of the coating through Vickers microhardness testing, as well as the bond strength of the coating on the substrate. Phases that play a role in increasing the hardness and adhesion strength of the coating, such as Ni2B and Ni40Cr42Mo18 in the SP 242 coating, as well as the Ni2Al3 and Cr23C6 phases in the SP 242 mix W 375 coating, were identified through XRD characterization testing. A porosity percentage of 0,15% was found in the SP 242 coating without heat treatment and 0,08% in the SP 242 coating with 900°C heat treatment, 0,005% porosity in the SP 242 mix W 375 coating without heat treatment, and 0,01% porosity was found in the SP 242 mix W 375 coating without heat treatment through SEM testing. The distribution of Nickel, Boron, Chromium, Molybdenum, Carbon, and Aluminum elements in the SP 242 and SP 242 mix W 375 coatings as supporting data for XRD was detected through EDX testing and mapping. In the SP 242 wire coating, the highest hardness was 922,5 HV at a heat treatment temperature variation of 900°C. In the SP 242 mix W 375 coating, it reached a hardness of 1010,5 HV at a heat treatment variation of 700°C. In the pull-off test results, the SP 242 variant without heat treatment had the highest bond strength of 26,8 MPa, and the SP 242 mix W 375 variant with 800°C heat treatment had a bond strength of 29,6 MPa. Therefore, it has been concluded that the SP 242 coating with 900°C heat treatment and the SP 242 mix W 375 coating with 800°C heat treatment have superior characterization and mechanical test results.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Boiler CFB, Arc spray coating, Heat treatment, Intermetalik NiAl.
Subjects:	Q Science > QD Chemistry > QD79.T38 Thermal analysis
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User:	Joel Carlos Hasudungan Bancin
Date Deposited:	27 Jan 2026 04:08
Last Modified:	27 Jan 2026 04:09
URI:	http://repository.its.ac.id/id/eprint/130415

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