Development of Surface Properties of Nickel-Based Alloy 617 through Aluminum-Pack Cementation
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Abstract
This research explores the enhancement of nickel-based alloy 617 using aluminum pack cementation via direct diffusion. The coating powder, composed of aluminum, alumina, and ammonium chloride (22.5:120:7.5 grams by weight), was applied at 800°C for 1, 2.25, 4, and 6.25 hours, followed by homogenization at 1,150°C for 30 minutes. Oxidation resistance testing at 950°C for 64 hours, analyzed via X-Ray diffraction, scanning electron microscopy, and energy-dispersive spectroscopy, showed that coating duration directly affects thickness, with 6.25-hour coatings being the thickest. However, the 2.25-hour coating exhibited the best oxidation resistance, showing the lowest weight gain, while the 6.25-hour coating led to increased NiO formation and internal stress, reducing oxidation protection. Microstructural analysis confirmed NiAl as the main phase in the 2.25-hour coating, with Al2O3 providing better oxidation resistance compared to Cr2O3. Considering both performance and cost-effectiveness, the 2.25-hour coating is the most optimal, balancing oxidation resistance, feasibility, and production cost.
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บทความ ข้อมูล เนื้อหา รูปภาพ ฯลฯ ที่ได้รับการตีพิมพ์ในวารสารฯ ถือเป็นลิขสิทธิ์ของวารสารฯ หากบุคคลหรือหน่วยงานใดต้องการนำทั้งหมดหรือส่วนหนึ่งส่วนใดไปเผยแพร่ต่อหรือเพื่อกระทำการใดๆ จะได้รับอนุญาต แต่ห้ามนำไปใช้เพื่่อประโยชน์ทางธุรกิจ และห้ามดัดแปลง
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