Yoshinori Takeichi

Friction Characteristic of CrN/DLC2 Layer Deposited on AISI 304 in Contact with Al2O3 Ball Examined Under Atmospheric and Vacuum Conditions

The results of “ball on disc” tests for determination of the friction coefficient under the specific conditions of low and high vacuum are presented. Advanced nanocomposite coating CrN/DLC2 was deposited by plasma assisted chemical vapour deposition PACVD on AISI 304 (STN 41 7241) stainless steel plates. Friction pairs—composed from coating surface and Al2O3 ball examined under low vacuum reached during the tribological tests significant lower friction coefficient values than those worked under atmospheric conditions.

The friction behavior of Ni−-, SiO−2- and mica sodium silicate-based solid lubrication composites

The friction behavior of Ni - -, SiO - 2 - and mica sodium silicate-based lubricant composites, which included BN, WS 2 and graphite as lubricants, were examined. A ring-on-disk apparatus, in which a solid lubricant composite disk was held against a rotating stainless ring, was used as the test configuration. The tests were run with a load from 62 to 250 N in temperatures from 20 to 800°C in the laboratory environment. The wear surface was characterized by scanning electron microscope and X-ray photo spectroscopy. The major findings were that both mica sodium silicate- and SiO - 2 -based composites failed at above 500°C due to severe wear and surface damage; in contrast, Ni - -based composite showed a stable friction coefficient and low wear from 20 to 800°C.