Chemical Vapor Deposited Diamond Wear Parts

4 Chemical Vapor Deposited Diamond Wear Parts 

The extreme abrasion and erosion resistance of polycrystalline CVD diamond combined with chemical inertness, make it a perfect candidate for use in applications such as wear parts, solid-state sensors, actuators and tools [85,86]. The combination of diamond s hardness, high Young modulus, very low coefficient of friction (less than 0.1 in air) and low wear rates (less than 10 m ) 

Limited data is available on the wear rate of CVD diamond [90,91]. A recent study has been conducted in order to investigate the basic tribological properties of bulk and thin-film CVD diamond. The sliding wear characteristics of a number CVD diamond materials have been evaluated using a modified Denison T62 abrasion [92] pin-on-disc test rig, operated in dry and lubricated sliding wear conditions, and compared with a typical hardened steel which is often used for wear part components. 

2 Applications of Diamond Synthesized by Chemical Vapor Deposition 

The test parameters were identical in each case, with a contact stress of 15 MPa and sliding speed of 150mmin . The tests were performed for 48 h where possible (to steady state or until sliding speed diminished through increased friction). 

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Boron-carbon-nitride ceramic is deposited on iron-based sliding parts by chemical vapor deposition (CVD) it is used as rotary compressor shafts, in order to improve the wear resistance [1 to 5]. Such B-C-N coatings have also been applied to dynamic pressure air bearings [6]. In gas-cooled nuclear reactors, °B-enriched B-C-N can be deposited by CVD in the fluid channels of the fuel elements for permanent deactivation in case of an emergency [7]. Radiofrequency or microwave-enhanced CVD is employed in order to deposit a diamond carbon and (3-BN superlattice structure [8]. 

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