Development of ultrananocrystalline diamond (UNCD) coatings for multipurpose mechanical pump seals

Ultrananocrystalline diamond coatings were deposited on SiC dynamic seals. Coatings were prepared by microwave plasma chemical vapor deposition. Utility of UNCD films on SiC seals was shown for improving wear resistance. Effect of different initial roughness on adhesion and wear was studied. Increased initial roughness of SiC surface improves adhesion of coatings.