Applications of CVD Diamond

Some actual and potential applications of CVD diamond are summarized in Table 

Grinding, cutting Inserts Twist drills Whetstones Industrial knives Circuit-board drills Oil-drilling tools Slitter blades Surgical scalpels Saws 

Wear parts Bearings Jet-nozzle coatings Slurry valves Extrusion dies Abrasive pump seals Computer disk coatings Engine parts Medical implants Ball bearings Drawing dies Textile machinery 

Diffusion, corrosion Crucibles Ion barriers (sodium) Fiber coatings Reaction vessels 

Optical coatings Laser protection Fiber optics Scanners Lenses Antireflection UV to IR windows X-ray windows Radomes 

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Koizumi, S., Nebel, C.E., and Nesladek, M. (2008) Physics and Applications of CVD Diamond, Wiley-VCH Verlag GmbH, Weinheim. 

Only a small selection of possible applications of CVD diamond could be touched on here. Many of the expectations which were placed on the applications of CVD diamond in the early years of the new diamond era have so far not come true, due to reasons like still too high deposition costs or insufficient film qualities for certain applications, major advances in competitive materials and technologies, or just the lack of a market. Nevertheless, thanks to the tremendous progress which has been made in the recent years and will undoubtly be made in the future, CVD diamond can be expected to play an ever increasing role as the ultimate material for a variety of technical purposes. 

Some actual and potential applications of CVD diamond are listed in Table 13.7.[30J[32]... 

Applications of CVD diamond include substrates and heat sinks for electronic packaging hardened surfaces for cutting tools and abrasives, hardened surfaces for bearings and wear components, and windows for radar and infrared systems. ... 

Koizumi S, Nebel C, Nesladek M (2008) Physics and applications of CVD diamond. Wiley-VCH, Weinheim... 

With such properties, it could be the ideal material for many semiconductor applications, such as high-power and high-frequency transistors and cold cathodes, or in the harsh environment found in internal-combustion and jet engines. With the advent of CVD diamond, it is now possible to take advantage of these properties. 

Spear, K. E., Dismukes, J. P. 1994 Synthetic diamond emerging CVD science and technology. New York Wiley. This book gives a useful description of the chemistry and physics behind diamond CVD, as well as various novel applications for CVD diamond. 

Numerous other fields of diamond film application are known, and more are sure to emerge in the future. One potential application makes use of the diamond films high thermal conductivity, which by far exceeds that of any other bulk material. Hence, diamond is suitable for heat dissipation, for example, in electronic circuitry. For instance, a surface may be coated with a layer of CVD diamond which then effects the removal of heat Another conceivable setup would be using a... 

H. Tokura, and M. Yoshikawa, Polishing of CVD diamond film, in Applications of Diamond Films and Related Materials, (Y. Tzeng, M. Yoshikawa, M. Murakawa, and A. Feldman, eds.), Elsevier Science Publishers, Amsterdam, pp. 241-248... 

As stated in the introduction, high-sensitivity white-light absorption spectroscopy has been used more extensively in studying the gas-phase composition during the CVD of diamond films than in other applications of CVD. In this section we review the use of high-sensitivity white-light absorption for the measiuement of n for the various free radicals and molecules present in the CVD of diamond under different conditions. 

Values of the dielectric loss of CVD diamond have been measured over the past 3 years as a suitable material grade for dielectric window applications was being developed [5]. For open resonant cavity measurements, samples are usually required to be of at least 30 mm in diameter and of thickness in excess of 0.87 mm depending on the measurement frequency and the accuracy required. For recent CVD diamond, values of tan 5 below 10 have been achieved. A specific example is a window 100 mm in diameter and 1.6 mm thick which exhibited a tan 8 value of 0.6 ( 0.2) 10 . This is the lowest value so far reported for CVD diamond and would enable the material to be used as output windows in Gyrotron tubes of powers in excess of 2 MW as discussed in 2.4. 

In this section, applications will be discussed which illustrate the versatility and advantages of CVD diamond as an infrared and multi-spectral window material. We describe the use of CVD diamond optical elements including CVD diamond domes and flat plates as windows for IR seekers or imaging systems in high-speed flight or other mechanically aggressive environments. Then we describe the use of CVD diamond windows for the transmission of high-power IR laser beams. 

Study of CVD diamond films for thermal management in power electronics. Proceedings, 2007 European Conference on Power Electronics and Applications, 2-5 September, Aalborg, Denmark, pp. 1. ... 

Until World War II, the diamond business was relatively simple, consisting only of natural diamond. The great majority of the market was gemstones and industrial applic2rtions were limited. The advent of synthetic diamond and the rapid rise of industrial applications have drastically altered the industry, and more changes will undoubtedly take place in the future such as the development of CVD diamond (Ch. 13). The challenge and potential impact of this new technology are well understood by the dieimond producers. 

The ability to deposit single-crystal diamond, or at least a material with a high degree of crystalline orientation and with properties equal to the high-purity single crystal material, would be an important factor in the development of CVD diamond in electronic, semiconductor, optical, and other applications. 

The rough surface of CVD diamond is also a drawback since an optically smooth coating is an essential requirement for most optical applications. The surface can be smoothed to some degree by increasing the nucleation density and by deposition strongly <100> textured coatings where the surface consists of flat 100 faces more or less parallel to the substrate.I ... 

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