Design and micro mechanical properties of nano-SiO₂ strengthened composite coatings towards remanufacturing

À´Ô´ÆÚ¿¯£ºÖÐÄÏ´óѧѧ±¨(Ó¢ÎÄ°æ)2005ÄêµÚz2ÆÚ

ÂÛÎÄ×÷ÕߣºÍõºìÃÀ Áõ´æÁú Ê·Å復 Ðì±õÊ¿

ÎÄÕÂÒ³Â룺190 - 194

Key words£ºremanufacturing£» nano-composite coating£» nano-indentation£» micro mechanical property

Abstract: Nano-SiO₂ particles strengthened Ni-based composite coating was designed and prepared on steel substrate. The structures and nanoparticle content of the nano-SiO₂/Ni composite coating were determined by SEM, EDS and TEM; and the micro mechanical properties were tested by nano-indentation technique. The results show that 56% of particles in the solution are dispersed in size of less than 100¤@nm, the content of nanoparticles co-deposited in the coating doubles and structure of the coating is more compact and uniform than that of Ni coating. Nano-SiO₂/Ni coating exhibits excellent micro mechanical properties, and the nanohardness and elastic modulus are 7.81¤@GPa and 198¤@GPa, respectively, which are attributed to finer crystal strengthening, dispersion strengthening and high-density dislocation strengthening of nano-SiO₂ particles to the composite coatings.