Amorphous hydrogenated carbon thin films deposited on stainless steel using high energy plasma focus device

Ghorbani, Ali; Sadighzadeh, A.; Seifi, Majid; Kiai, S. M. Sadat; Raeisdana, A.

doi:10.1016/j.surfcoat.2016.01.006

Cited by 9 publications

(1 citation statement)

References 27 publications

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“…DLC is an amorphous carbon material with mostly sp 3 bonding, which exhibits many of the desirable properties of the diamond material. In the work of Ghorbani et al, using a high-energy plasma focus device, DLC films were deposited from the mixture of C 2 H 2 /H 2 gas at room temperature on steel (AISI 304) substrates [ 75 ]. Through the control of the hydrogen proportion in the mixture gas, the effect of hydrogen content on the structural and mechanical properties of DLC films was analyzed by them.…”

Section: The Effective Barriers For the Internal Carburizationmentioning

confidence: 99%

Diamond Deposition on Iron and Steel Substrates: A Review

et al. 2020

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This article presents an overview of the research in chemical vapor deposition (CVD) diamond films on steel substrates. Since the steels are the most commonly used and cost-effective structural materials in modern industry, CVD coating diamond films on steel substrates are extremely important, combining the unique surface properties of diamond with the superior toughness and strength of the core steel substrates, and will open up many new applications in the industry. However, CVD diamond deposition on steel substrates continues to be a persistent problem. We go through the most relevant results of the last two and a half decades, including recent advances in our group. This review discusses the essential reason of the thick catalytic graphite interlayer formed on steel substrates before diamond deposition. The high carbon diffusion in iron would induce severe internal carburization, and then voluminous graphite precipitated from the substrate. In order to hinder the catalytic graphite formation, various methods have been applied for the adherent diamond film deposition, such as pre-imposed various interlayers or multi-interlayers, special controls of the deposition process, the approaches of substrate alloying and so on. We found that adherent diamond films can be directly deposited on Al alloying steel substrates, and then the role of Al alloying element was examined. That is a thin dense amorphous alumina sublayer in situ formed on the alloying substrate, which played a critical role in preventing the formation of graphite phase and consequently enhancing diamond growth and adhesion. The mechanism of Al alloying suggests that the way used to improve hot corrosion resistance is also applicable. Then, some of the hot corrosion resistance methods, such as aluminizing, siliconizing, and so on, which have been used by some researchers examining CVD diamond films on steel substrates, are reviewed. Another way is to prepare diamond-like carbon (DLC) films on steel substrates at low temperature, and then the precipitated graphite from the internal carburization can be effectively avoided. In addition, based on some new findings, the understanding of the diamond nucleation and metastable growth is discussed.

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Section: The Effective Barriers For the Internal Carburizationmentioning

confidence: 99%

Diamond Deposition on Iron and Steel Substrates: A Review

et al. 2020

Micromachines

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Enhancement of Mechanical and Structural Traits of Aluminum Using Low Energy Plasma Focus Device

et al. 2019

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Owing to good machinability, low weight and high specific strength, aluminum is widely used in aerospace and automotive industries. However, low mechanical strength limits its wide spread use in mainstream industries. In this study, nitriding of aluminum was performed with a stream of low energy ions in 1.8 kJ Mather type dense plasma focus (DPF) device. The axial distance from the anode tip was varied in steps to study the effect of the stream length on structural and mechanical properties of the nitrided samples. XRD and Raman analysis confirmed the formation of aluminum nitride (AlN) on the plasma exposed surface. Williamson‐Hall (W−H) study revealed significant improvement in crystallinity and strain of the nitride samples. The most favorable results on mechanical and structural properties of the nitrided samples were obtained at an axial distance of 10 cm. The improved texture and maximum dislocation density for typical AlN (311) is obtained at the optimum distance. The micro‐hardness of the nitrided samples was measured ∼4.5 times higher than the base material.

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