Coatings Tribology, Volume 56, Second Edition: Properties, by Kenneth Holmberg, Allan Matthews

By Kenneth Holmberg, Allan Matthews

The floor coating box is a speedily constructing zone of technological know-how and know-how that provides new equipment and methods to manage friction and put on. New coating kinds are constantly being constructed and the capability purposes in several business fields are ever starting to be, starting from computing device elements and client items to clinical tools and prostheses. This booklet presents an intensive evaluate of the newest know-how within the box, addressing innovations reminiscent of actual and chemical vapour deposition, the tribological houses of coatings, and coating characterization and function evaluate options. 11 assorted situations are tested in shut element to illustrate the advance of tribological homes and a consultant to picking coatings can also be supplied. This moment variation continues to be the one monograph within the box to provide a holistic view of the topic and offers all features, together with attempt and function facts in addition to insights into mechanisms and interactions, hence offering the extent of figuring out very important for the sensible software of coatings.

* an intensive overview of the newest advancements within the box of floor coatings
* offers either thought and functional applications
* contains a advisor for choosing coatings

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Extra info for Coatings Tribology, Volume 56, Second Edition: Properties, Mechanisms, Techniques and Applications in Surface Engineering (Tribology and Interface Engineering)

Example text

Bipolar pulse power can be either symmetric or asymmetric, depending on the relative positive and negative maximum voltages (Scholl, 1996). Pulsed DC power is said to be symmetric if these voltages are equal. With modern power supplies it is possible to control the on and off time for the pulses. The successful use of symmetric bipolar pulsed DC power has been reported for the deposition of oxide coatings from two magnetron targets. These targets, mounted side by side, are both connected to the same bipolar pulsed DC power supply.

Thus, electrodeposited coatings can also be dense and pore free. However, the stress state of the growing film can strongly influence its functionality. Hard chrome coatings typically exhibit a microcracked structure which can actually be beneficial in retaining lubricants. Cracked structures actually contain more chromium oxide, which can enhance wear resistance. 2 Composite structures In the above we have briefly outlined the intrinsic structural characteristics of the main coating methods used to produce tribological coatings.

Coating materials are usually applied to resist abrasive wear, and typically contain carbides of chromium, tungsten or boron dispersed in a matrix of iron, cobalt or nickel. g. austenitic manganese steel. This, as deposited, is relatively soft (approx. 170 Hv), but hardens to about 550 Hv when subjected to impact conditions. This material gives an example of how the processing route can affect the coating properties. The austenitic structure of manganese steel is normally produced by a water quench from Deposition Processes and Coating Structures 29 Fig.

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