Investigation properties Aluminum coated by active screen plasma nitriding

Publish Year: 1395
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:

IIAC04_051

تاریخ نمایه سازی: 22 دی 1396

Abstract:

Nitriding has been shown to improve the poor tribological properties of Aluminum and Aluminum alloys. However, nitriding Aluminum alloys is difficult because of the high affinity of oxygen to Aluminum in a surface, Aluminum oxide layer that acts as a diffusion barrier and precludes nitriding even at high pressure. Active screen plasma nitriding (ASPN) is an emerging surface engineering technology that offers many advantages over the conventional DC plasma nitriding (PN). In this research plasma nitriding of pure aluminum 1050, using iron active screen was investigated. At first the rectangular cube-shaped samples with dimensions, 20 × 20 × 5 mm3 prepared. Then under atmosphere %20 H2-%80 N2, at 450, 500 and 550 ° C, 80% duty cycle and the frequency of 10 kHz for 10 hours were plasma nitrided. The coatings were characterized using X-ray diffraction, scanning electron microscopy. Results showed that the coatings were mainly consist of Fe2-3N particles whose size particles increased by increasing temperature. The surface of samples coated with the method of active screen plasma nitriding, to form hexagonal nitride particles covered with uniform distribution.

Keywords:

Active Screen Plasma Nitriding , Aluminum , Iron nitride , Aluminum nitride

Authors

K Taherkhani

Department of material and metallurgical engineering, Iran University of Science and Technology, Narmak, Tehran, ۱۶۸۴۶-۱۳۱۱۴, Iran

M Soltanieh

Department of material and metallurgical engineering, Iran University of Science and Technology, Narmak, Tehran, ۱۶۸۴۶-۱۳۱۱۴, Iran