This paper evaluates the physical properties of nano-reinforced nylon 11/silicon oxide composite coatings produced using high-speed flame spraying as a function of the process technology and the composition. The coatings were created from nylon 11 powders with starting particle sizes of 30 and 60 micrometer and with 5 to 20% by volume of 9 nm reinforcing silicon oxide particles. Corrosion tests on aluminum and steel substrates showed that the metallic substrate is effectively protected and that the corrosion resistance does not change even if the coating is exposed to salt water for 100 hours. Paper includes a German-language abstract.

In this paper, the residual stresses in high velocity oxy-fuel-sprayed chromium carbide/nickel-chromium coatings are measured using a bending technique "Almen" type measured. The influence of the most important spray parameters (including total gas flow rate, fuel-oxygen ratio, spray distance, thermal effects of the process, and particle speed) on the generation of internal stresses is examined. The influences of the process factors and material properties are studied, for example the "hammering" of the coating by impacting particles and the lack of conformity of the coefficient of thermal expansion of the coating/substrate. The results show that all residual stresses were caused by pressure and were very sensitive to the thermal effects of the process. Paper includes a German-language abstract.

Ceramic/polymer nanocomposites promise to be a new class of materials that will have wide application either for surface protection, providing low friction and inert corrosion barriers, or where tailored electrical and magnetic properties with increased abrasion and wear resistance are required. The high velocity oxy-fuel (HVOF) combustion spray process has been used to successfully process polymer-ceramic nanocomposites at 5 - 20 volume % of reinforcement. The latest results of process-structure- property relationship studies in silica and carbon black reinforced nylon 11 coatings are presented. It was found that the improvement in mechanical properties depends on the distribution and surface chemistry of the particulates and on the increase in matrix crystallinity due to the particulates.