Plazma Nitrürlenmiş X153CrMoV12 Soğuk İş Takım Çeliği Üzerine Tetrahedral Amorf Karbon (ta-C) Kaplamalarının Tribolojik Performansı

Öz

Elmas benzeri karbon (DLC) kaplamalar, tetrahedral amorf karbon (ta-C) gibi, zorlu endüstriyel ortamlardaki tribolojik uygulamalar için uygun, sert ve düşük sürtünmeli karbon filmler sağlamaktadır. Bu çalışmada, PVD ark teknolojisiyle (Ionbond Tetrabond) biriktirilmiş elmas benzeri karbon (ta-C), kalitesi ve X153CrMoV12 takım çeliklerine uygulanabilirliği araştırılmıştır. Plazma nitrürleme (535°C, 9 saat), DLC kaplama ve dupleks plazma nitrürleme ile DLC kaplama olmak üzere üç farklı yüzey işlemi uygulanmıştır. Bu işlemlerin kimyasal ve fiziksel özellikleri Raman, XPS, SEM ve XRD gibi karakterizasyon teknikleri kullanılarak karşılaştırılmıştır. XPS analizi, yalnızca DLC kaplama için yaklaşık %60, dupleks nitrürleme + DLC kaplama için %62 oranında sp3 fraksiyon değerlerini ortaya koymuş; bu sonuçlar yüksek kaliteli ta-C filmlerini doğrulamaktadır. Aşınma testleri, 10 N ve 20 N yükler altında, 0,04 m/s hız ve 100 m mesafede gerçekleştirilmiştir. Düşük kaplama kalınlığı (~400 nm), yük taşıma kapasitesini sınırlamış; erken aşınmaya ve alt tabakanın açığa çıkmasına yol açmış, aynı zamanda sürekli yükler altında artan sürtünmeye neden olmuştur. Kaplanmamış numunelerle karşılaştırıldığında, ta-C kaplamanın nitrürlü bir alt tabaka üzerine biriktirildiğinde delaminasyona karşı gelişmiş yapışma direnci sergilediği görülmektedir. Dupleks nitrürleme ve DLC kaplama konfigürasyonu, kaplanmamış referans numuneye kıyasla aşınma izi genişliğinde %78'e varan en belirgin azalmayı sağlamış ve endüstriyel soğuk şekillendirme uygulamaları için en uygun yüzey işleme stratejisi olarak öne çıkmıştır. Dupleks işlem uygulanmış numunenin sürtünme katsayısı (CoF), test boyunca en düşük değerde kalmış; bu durum söz konusu numunenin üstün tribolojik performansını doğrulamaktadır. Bu araştırma, takım çeliklerinde ve elmas benzeri karbon kaplama teknolojisindeki ilerlemelere zemin hazırlamaktadır.

Anahtar Kelimeler

• Elmas benzeri karbon
• Tetrahedral amorf karbon
• Soğuk iş takım çelikleri
• Aşınma
• plazma nitrürleme
• Yüzey karakterizasyonu

Proje Numarası

KUBAP-01/2021-23

Tribological Performance of Tetrahedral Amorphous Carbon (ta-C) Coatings on Plasma-Nitrided X153CrMoV12 Cold Work Tool Steel

Öz

Diamond-like carbon (DLC) coatings, specifically tetrahedral amorphous carbon (ta-C), provide hard, low-friction carbon films suitable for tribological applications in demanding industrial environments. In this study, we investigated diamond-like carbon (ta-C) deposited by PVD arc technology (Ionbond Tetrabond), its quality, and applicability on tool steels, X153CrMoV12. Three different surface treatments were applied: plasma nitriding (535 °C, 9 h), DLC coating, and duplex plasma nitriding combined with DLC coating. The DLCs were characterized using characterization techniques, such as Raman, XPS, SEM, and XRD. XPS analysis reveals sp3 fractions of approximately 60% (DLC-only coating) and 62% (duplex nitrided + DLC coating) which confirm the high quality of the deposited ta-C films. Wear tests were conducted under loads of 10 N and 20 N, with a speed of 0.04 m/s and a distance of 100 m. Low coating thickness (~400 nm) limited load-carrying capacity, leading to premature wear and substrate exposure, as well as increased friction under continuous loads. Compared to non-coated samples, ta-C coating exhibits improved adhesion resistance to delamination if deposited on a nitrided substrate. The duplex nitrided and DLC-coated configuration achieved the most significant reduction in wear track width of up to 78% compared to the uncoated baseline, establishing it as the optimal surface treatment strategy for industrial cold-forming applications. The coefficient of friction (CoF) for the duplex-treated sample remained the lowest throughout testing, confirming its superior tribological performance. This research paves the way to improvements in tool steels and coating technology of diamond-like carbon.

Anahtar Kelimeler

• Diamond-like carbon
• Tetrahedral amorphous carbon
• Cold work tool steels
• Wear
• Plasma nitriding
• Surface characterization

Proje Numarası

KUBAP-01/2021-23

Kaynakça

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