Structural Modifications on Material Surfaces by Thermal Nanoparticle Spraying and Microlines Patterning

摘要

Thermal nanoparticles coating and microlines patterning were newly developed as novel technologies to create fine metal or ceramics layers and geometrical intermetallics patterns for mechanical properties modulations of metals substrates. Nanometer sized alumina particles were dispersed into liquid resins, and the obtained slurries were sputtered by compressed air jet. And, the slurries mists blew into the arc plasma with argon gas spray. On stainless steels substrates, the fine surface layers with high wear resistance were formed. Subsequently, pure aluminum particles were dispersed into the photo solidified liquid resins, and the slurry was spread on the stainless steel substrates. On the steels substrates, microline patterns with self similar fractal structures were drawn and fixed by an ultra violet laser scanning. The patterned pure metal particles were heated by the argon arc plasma spray assisting, and the intermetallics or alloys phases with high hardness were created through reaction diffusions. Microstructures in the coated layers and the patterned lines were observed by using a scanning electron microscopy.