Perbandingan Ketahanan Abrasi pada Thermasic Coating yang Dirpoduksi dengan Teknik HVOF Diamond Jet dan HVOF JP5000

Rosalina, Amanda (2023) Perbandingan Ketahanan Abrasi pada Thermasic Coating yang Dirpoduksi dengan Teknik HVOF Diamond Jet dan HVOF JP5000. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Teknik pelapisan thermal spray menggunakan material yang memiliki ketahanan aus tinggi dapat diaplikasikan pada komponen penting di PLTU seperti bagian boiler tube. Salah satu jenis coating yang dapat digunakan adalah thermal spray coating dengan bahan dasar Silicon Carbide. Teknik thermal spraying High Velocity Oxygen Fuel (HVOF) memiliki kelebihan dalam memproduksi carbide base coating dibandingkan dengan teknik thermal spray lainnya. Thermal Spray HVOF dapat menghasilkan coating dengan porositas rendah, bonding interlayer yang bagus dan minimnya oksidasi pada karbida. Dua teknik HVOF yaitu HVOF Diamond Jet (Oerlikon Metco, Swedia) dan JP5000 (Praxair, USA) digunakan dalam penelitian ini untuk memproduksi ThermaSiC coating. HVOF Diamond Jet menggunakan gas hidrogen dan oksigen sebagai bahan bakar utamanya sedangkan HVOF JP5000 menggunakan kerosin dan oksigen sebagai bahan bakarnya. Hal ini akan memberikan karakteristik ThermaSiC coating yang berbeda meliputi kekerasan, porositas dan ketebalan. Oleh karena itu karakterisasi ThermaSiC coating hasil dari HVOF Diamond Jet dan JP5000 dilakukan pada penelitian ini. Pengujian abrasi dengan standar ASTM G65 pada kondisi kering dilakukan untuk mengetahui sifat ketahanan ausnya. Adapun parameter pengujian abrasi yang divariasikan adalah kecepatan putaran rubber wheel sebesar 324.3 dan 217.4 rpm serta durasi pengujian selama 10 dan 20 menit. Hasil pengujian menunjukkan bahwa kecepatan rubber wheel yang tinggi (324.3 rpm) dan durasi pengujian 20 menit menunjukkan keausan total dari HVOF Diamond Jet ThermaSiC coating diikuti dengan substrat baja karbon yang mengalami keausan. Diperoleh spesific wear rate tertinggi yaitu 2.01x10-3 m3/N.m. Menariknya pada HVOF JP5000 durasi pengujian yang sama menghasilkan spesific wear rate jauh lebih kecil sepertiga dibanding HVOF Diamond Jet ThermaSiC coating dengan sebagian substrat baja mengalami keausan. Nilai spesific wear rate pada kondisi pengujian lainnya relatif jauh lebih kecil karena keausan hanya terdeteksi sampai pada substrat baja karbon. Secara umum, hasil pengujian abrasi menunjukkan bahwa HVOF ThermaSiC coating JP5000 memiliki ketahanan abrasi yang lebih baik daripada ThermaSiC coating Diamond Jet. Hal ini karena ThermaSiC Coating JP5000 memiliki karakteristik lebih baik daripada ThermaSiC Diamond Jet dimana porositas terukur pada coating JP5000 sebesar 0.471% sedangkan coating Diamond Jet sebesar 0.677%. Selain uty kekerasan lapisan coating JP5000 lebih tinggi 675 HV2 dibanding coating Diamond Jet sebesar 560 HV2.
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Thermal spray coating techniques using materials that have high wear resistance can be applied to important components in PLTU such as boiler tube parts. One type of coating that can be used is thermal spray coating with Silicon Carbide base material. The High Velocity Oxygen Fuel (HVOF) thermal spraying technique has advantages in producing carbide base coatings compared to other thermal spray techniques. Thermal Spray HVOF can produce coatings with low porosity, good interlayer bonding and minimal oxidation on carbide. Two HVOF techniques namely HVOF Diamond Jet (Oerlikon Metco, Sweden) and JP5000 (Praxair, USA) were used in this study to produce ThermaSiC coating. HVOF Diamond Jet using hydrogen gas and oxygen as its main fuel while HVOF JP5000 uses kerosene and oxygen as its fuel. The difference in fuel in the HVOF thermal spray gun causes differences in heating temperature and particle velocity in the flame torch. This will give different ThermaSiC coating characteristics including hardness, porosity and thickness. Therefore, the characterization of ThermaSiC coatings resulting from HVOF Diamond Jet and JP5000 was carried out in this study. Abrasion testing with ASTM G65 standards in dry conditions was carried out to determine its wear resistance properties. The abrasion test parameters that were varied were the rubber wheel rotation speed of 324.3 and 217.4 rpm and the test duration of 10 and 20 minutes. The test results showed that the high rubber wheel speed (324.3 rpm) and test duration of 20 minutes showed total wear of the HVOF Diamond Jet ThermaSiC coating followed by the carbon steel substrate experiencing wear. The highest specific wear rate of 2.01x10-3 m3/N.m. Interestingly, the HVOF JP5000 with the same test duration produced a much smaller specific wear rate of one third compared to the HVOF Diamond Jet ThermaSiC coating with partially worn steel substrate. The specific wear rate values in the other test conditions were relatively much smaller because wear was only detected on the carbon steel substrate. In general, the abrasion test results show that HVOF ThermaSiC coating JP5000 has better abrasion resistance than ThermaSiC coating Diamond Jet. This is because ThermaSiC Coating JP5000 has better characteristics than ThermaSiC Diamond Jet where the porosity measured on the JP5000 coating is 0.471% while the Diamond Jet coating is 0.677%. In addition, the hardness of the JP5000 coating is higher at 675 HV2 than the Diamond Jet coating at 560 HV2.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	HVOF Coating, ThermaSiC, Abrasive
Subjects:	T Technology > TS Manufactures > TS320 Steel--Metallurgy. T Technology > TS Manufactures > TS699 Powder coating of metals
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21101-(S2) Master Thesis
Depositing User:	AMANDA ROSALINA
Date Deposited:	28 Aug 2023 07:40
Last Modified:	28 Aug 2023 07:40
URI:	http://repository.its.ac.id/id/eprint/103339

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