The Fatigue Properties of Titanium Alloy (Ti-4.5Al-3V-2Mo-2Fe) with PVD thin film
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Abstract:
The purpose of this study is to investigate the effects of the physical vapor deposition (PVD) and gas-nitriding on the fatigue properties of titanium alloy (Ti-4.5Al-3V-2Mo-2Fe). Rotational bending fatigue tests were performed on five types of specimens; that are uncoated, TiN coated, gas-nitrided, annealed after TiN coating, and Ti-TiN coated. We obserbed the fracture process. The results are summarized as follows : 1) The fatigue strength of the gas-nitrided specimen was decreased less than that of the untreated and TiN coated specimens. This is because the matrix grain size increased because of a high temperature nitriding process (800℃ for 4 hours). 2). Fatigue limit of Ti-TiN coated specimens that was maked to progress fatigue strength of titanium alloy (Ti-4.5Al-3V-2Mo-2Fe) was decreased less than that of TiN coated specimens. This is because : firstly Ti coated surface was highly rough, secondly the thickness of Ti film was much smaller than that of diflusion layer of gas-nitrided specimen.Keywords:
Titanium alloy
Physical vapor deposition
Fatigue limit
Vapour deposition
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SummaryRecent developments in the field of physical vapour deposition (PVD) enable thin films of superhard Titanium Nitride (TiN) to be deposited onto a variety of metallic substrates. Such films are finding widespread application for reducing wear and improving the tribological properties of surfaces, whilst the golden colour of TiN makes it highly suitable for use as a decorative coating.The relevant properties of TiN are described, an overview of the various PVD processes is provided and the widely used arc-evaporative technology is discussed. Some recent performance data demonstrating the diverse range of applications of such coatings is given. Additional informationNotes on contributorsP. W. HattoDr Hatto is a physics graduate of the City University, London, and received his Ph.D. for research into thin film growth from the liquid phase. Post doctoral studies into the sputter deposition of metal films lead to his current interest in the physical vapour deposition of hard compounds. From 1982 to 1985 he was chief scientist of Multi-Arc (Europe) Ltd and in 1987 joined Advanced Surface Engineering Technologies L td (ASET), a joint venture company between Multi Arc division of Andal of St. Paul. Minnesota and Newcastle upon Tyne Polytechnic. Dr Hatto is currently Technical Director of this Newcastle based company.
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SummaryWear resistant surface coatings, particularly those of Titanium Nitride (TiN) have been successfully applied to HSS cutting tools. Recently a “second generation” of new PVD coatings have been deposited on HSS substrates. In this paper, new alloy nitride coatings, including TiAIN, TiZrN and TiCN, produced by either the “Steered Arc’” or “Magnetron Sputtering”2 techniques are considered and their performance compared with conventional bright finished drills and “standard” TiN coatings on twist drills.
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Metallic nitride hardcoatings (titanium nitride and chromium nitride) are routinely deposited on a wide variety of cutting tools, forming tools, and other components using high temperature 538 °C (1000 oF) physical vapor deposition (PVD) processes. This family of hardcoatings can also be deposited at temperatures below 93 °C (200 oF) using an advanced ion beam enhanced deposition (IBED) process. The metallurgical compositions of IBED-deposited titanium nitride and chromium nitride coatings are verified by Rutherford Backscattering Spectroscopy, and mechanical properties including scratch adhesion and abrasive wear-resistance are measured. These mechanical properties were also measured for titanium nitride and chromium nitride hardcoatings deposited by physical vapor deposition (PVD) as well as hard chrome plated coatings. The IBED deposited hardcoatings are shown to be viable, low temperature alternatives to PVD deposited hardcoatings and industrial hard chrome plating.
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Physical vapor deposition (PVD) technologies are widely used to produce wear and corrosion resistant coatings for a variety of industrial applications. In recent years, there has been remarkable interest in the development of novel wear resistant coatings prepared through PVD methods, which helps to reduce friction and wear, as a result of recovering energy losses up to 30% due to friction and economy loss due to wear. This chapter provides comprehensive data of recent progress in wear resistant coatings prepared using PVD methods, starting with the introduction of it needs, significance, physiochemical properties, and the selection criteria of wear resistant coatings. The applications, physical, and chemical properties of superhard materials such as diamond like carbon (DLC), titanium nitride (TiN), chromium nitride (CrN), and tantalum nitride (TaN) are also presented.
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