Pengaruh Variasi Jenis Perekat Densitas, Porositas, Dan Kekerasan Hasil Sintering Serbuk Limbah Laser Cutting Baja

Mahendra, Ridwan Nur Okta (2026) Pengaruh Variasi Jenis Perekat Densitas, Porositas, Dan Kekerasan Hasil Sintering Serbuk Limbah Laser Cutting Baja. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Limbah serbuk baja hasil proses laser cutting memiliki potensi untuk dimanfaatkan kembali sebagai bahan baku melalui metode powder metallurgy sehingga dapat mendukung penerapan ekonomi sirkular di bidang manufaktur. Salah satu faktor yang memengaruhi kualitas produk hasil sintering adalah jenis perekat (binder) yang digunakan karena berperan dalam membentuk ikatan awal antarpartikel sebelum proses sintering berlangsung. Penelitian ini dilakukan untuk menjawab permasalahan mengenai pengaruh variasi jenis binder terhadap densitas, porositas, dan kekerasan hasil sintering serbuk limbah laser cutting baja serta menentukan jenis binder yang menghasilkan karakteristik material paling optimal. Penelitian menggunakan serbuk limbah laser cutting baja dengan variasi binder Stearic Acid 2%, Gummi Arabisch 2%, dan Zinc Stearate 2%. Serbuk disaring menggunakan test sieve mesh 100, kemudian diuji komposisi kimia menggunakan XRF, dicampur dengan binder, dikompaksi pada tekanan 400 MPa, dan disinter pada temperatur 1100°C dengan holding time 30 menit pada 300°C dan 1100°C. Karakterisasi material dilakukan melalui pengukuran densitas, analisis porositas menggunakan Digital Microscope yang didukung perangkat lunak ImageJ, serta pengujian kekerasan menggunakan metode Rockwell A. Hasil penelitian menunjukkan bahwa variasi jenis binder memengaruhi karakteristik hasil sintering. Binder Zinc Stearate 2% menghasilkan densitas tertinggi sebesar 4,72 g/cm³, porositas terendah, dan nilai kekerasan rata-rata tertinggi sebesar 35,9 HRA dibandingkan Stearic Acid 2% dan Gummi Arabisch 2%. Hasil analisis statistik menggunakan One-Way ANOVA menunjukkan bahwa variasi binder memberikan pengaruh signifikan terhadap porositas dan kekerasan, sedangkan terhadap densitas tidak menunjukkan perbedaan yang signifikan. Dengan demikian, Zinc Stearate 2% merupakan binder yang paling optimal untuk meningkatkan karakteristik hasil sintering serbuk limbah laser cutting baja.
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Steel powder waste generated from the laser cutting process has the potential to be reused as a raw material through powder metallurgy, supporting the implementation of a circular economy in the manufacturing industry. One of the factors affecting the quality of sintered products is the type of binder used, as it plays an important role in forming the initial bonding between powder particles before sintering. This study was conducted to investigate the effect of different binder types on the density, porosity, and hardness of sintered steel laser cutting waste powder and to determine the optimum binder based on the obtained material characteristics. Steel laser cutting waste powder (ST41) was mixed with three binder variations: 2% Stearic Acid, 2% Gummi Arabisch, and 2% Zinc Stearate. The powder was sieved using a 100-mesh test sieve, analyzed for chemical composition using XRF, compacted at a pressure of 400 MPa, and sintered at 1100°C with a holding time of 30 minutes at both 300°C and 1100°C. Material characterization included density measurement, porosity analysis using a Digital Microscope supported by ImageJ software, and Rockwell A hardness testing. The results indicate that binder variation affects the characteristics of the sintered specimens. The 2% Zinc Stearate binder produced the highest density of 4.72 g/cm³, the lowest porosity, and the highest average hardness of 35.9 HRA compared with the other binder variations. Statistical analysis using One-Way ANOVA showed that binder variation had a significant effect on porosity and hardness, while no significant effect was observed on density. Therefore, 2% Zinc Stearate was identified as the most suitable binder for improving the properties of sintered steel laser cutting waste powder.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Powder Metallurgy, Serbuk Limbah Laser Cutting Baja, Binder, Densitas, Porositas, Kekerasan, Steel Laser Cutting Waste Powder, Density, Porosity, Hardness.
Subjects:	T Technology > TS Manufactures > TS161 Materials management. T Technology > TS Manufactures > TS170 New products. Product Development T Technology > TS Manufactures > TS176 Manufacturing engineering. Process engineering (Including manufacturing planning, production planning) T Technology > TS Manufactures > TS205 Metals--Heat treatment. T Technology > TS Manufactures > TS320 Steel--Metallurgy.
Divisions:	Faculty of Vocational > Mechanical Industrial Engineering (D4)
Depositing User:	Ridwan Nur Okta Mahendra
Date Deposited:	19 Jul 2026 15:57
Last Modified:	19 Jul 2026 15:57
URI:	http://repository.its.ac.id/id/eprint/135494

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