Results from experiments on hybrid plasma immersion ion implantation/nitriding processing of materials

Abstract

To improve the performance of critical part components, new methods for surface strengthening are being developed with success, like plasma immersion ion implantation (PIII) and hybrid surface treatments mixing PIII and ion nitriding processes. A combination of high pressure (4 × 10 1 P a), moderate temperature (up to 450 o C) glow discharge nitriding with low pressure (8 × 10 −2 P a) and low DC bias voltage ion nitriding (or DC PIII) was implemented. Depending on the particular conditions of the treatment and the depth probed, mixed phases of γN and ε were measured in the treated SS304 steel sample. This near surface modification resulted in an improved hardness (up to a factor of 2.7 ×) of the sample which could also enhance its wear properties. Surface modification of Ti6Al4V alloy and SS304 steel by a combination of PIII and subsequent ion nitriding was investigated as well. Nitrogen ions were implanted into the specimens at 15 keV and then ion nitrided at low pressure (7 × 10 −2 P a) with a bias of -800 V. Compared to the untreated samples, the hardness of Ti6Al4V alloy and the steels could be improved significantly. AES results indicated high retained doses in both samples, confirming the high efficiency of this hybrid process.

Pengaruh Nitridasi Plasma Terhadap Kekerasan Aisi 304 Dan Baja Karbon Rendah

“…Dengan teknologi ini mempunyai banyak keuntungan dibandingkan dengan teknologi nitridasi secara konvensional. Keuntungan ini diantaranya adalah: proses nitridasi berlangsung pada waktu dan suhu relatif rendah, tidak memerlukan quenching sehingga mengurangi distorsi, efisien pemakaian gas dan energi listrik, dan tidak menimbulkan polusi [2][3][4][5][6][7] . Di PTAPB-BATAN telah dilakukan rancangbangun sistem nitridasi ion/plasma [8] .…”

“…Nitridasi adalah suatu proses pengerasan permukaan dengan menambahkan unsur nitrogen pada permukaan benda kerja. Proses nitridasi umumnya menggunakan paduan gas N2 dan H2 pada 460˚C-600˚C dan diterapkan untuk pengerasan baja karbon rendah dan baja paduan sehingga membentuk senyawa nitrida logam [2,3,6] . Senyawa-senyawa tersebut bersifat keras dan sebagai protective layer yang dapat meningkatkan kekerasan permukaan, ketahanan aus dan ketahanan korosi.…”

“…Dari 2 (dua) cara tersebut proses nitridasi dengan gas (gas nitriding) lebih banyak digunakan. Sehubungan dengan perkembangan teknologi telah dikembangkan teknologi terkini untuk proses nitridasi yaitu teknik nitridasi ion/plasma (ion/plasma nitriding) [2][3][4][5][6][7] .…”

Uji Fungsi Sistem Nitridasi Ion Untuk Perlakuan Permukaan

“…Berdasarkan hasil pengujian kekerasan tersebut didapatkan kekerasan 2,44 kali dari kekerasan sebelum dinitridasi untuk nitridasi dengan gas N2 dan 4,05 kali dari kekerasan sebelum dinitridasi untuk nitridasi dengan gas N2 dan H2. Hasil ini cukup bagus karena pada umumnya kekerasan hasil nitridasi antara 2 sampai 3 kali (2,7 kali) kekerasan sebelum dinitridasi [10 ].…”

Co-deposition of titanium and iron nitrides on SS-321 by using plasma focus

“…Efforts are underway to understand the physics and the chemistry of these nitrides, reveal their properties and/or synthesize new phases. Extensive work is reported to modify the surface properties of different materials by various ion implantation techniques [3][4][5][6]. The DPF-assisted ion implantation [7,8] is preferable because of its technological advantages such as low temperature and well-controlled surface hardening of alloys [9].…”