Laser-induced phase transition and sintering of nano-diamond powders (4-8nm) was used to produce a thick (10-50um) strongly adherent nano-diamond/diamond-like carbon (nD-DLC) coatings on aluminum alloy 319. A transition to diamond-like carbon produced a Vickers hardness of 2250 kg/mm^2, and a transition to complete nano-diamond produced a Vickers hardness of 9000 kg/mm^2. Nano-diamond powders produced by detonation synthesis were electrostatically sprayed on the aluminum substrate coupons followed by a continuous CO2 laser heating in a controlled fashion; this causes a liquid-phase nano-sintering which yielded a strongly adherent coating. The application of the project will lead to coatings for light-weight engine components to improve their wear resistance.
Journal: TechConnect Briefs
Volume: 1, Nanotechnology 2008: Materials, Fabrication, Particles, and Characterization – Technical Proceedings of the 2008 NSTI Nanotechnology Conference and Trade Show, Volume 1
Published: June 1, 2008
Pages: 470 - 474
Industry sector: Advanced Materials & Manufacturing
Topics: Coatings, Surfaces & Membranes