Photonic Sintering of Oxide Ceramic Films: Effect of Colored FexOy Nanoparticle Pigments

Abstract

Alumina and zirconia thin films modified with colored nano-FexOy pigments were sintered by the flash-lamp-annealing method. We selected a nano α-Al2O3 and micron α-Al2O3 bimodal mixture as the base precursor material, and we doped it with 5 vol% of FexOy red/brown/black/yellow pigments. The coatings were deposited from nanoparticle dispersions both on glass and on flexible metal foil. The characteristics of the thin films obtained with the use of various additives were compared, including the surface morphologies, optical properties, crystallinities, and structures. Flash lamp annealing was applied with the maximum total energy density of 130 J/cm2 and an overall annealing time of 7 s. Based on the simulated temperature profiles and electron-microscopy results, a maximum annealing temperature of 1850 °C was reached for the red Al2O3: Fe2O3 ceramic film. The results show that red α-Fe2O3 pigments allow for the achievement of maximum layer absorption, which is effective for flash lamp sintering. It was also possible to use the selected red α-Fe2O3 particles for the flash-lamp-assisted sintering of ZrO2 on a 30 µm-thin flexible stainless-steel substrate.

Infrared irradiation to drive phosphate condensation as a route to direct additive manufacturing of oxide ceramics

“…α‐Al 2 O 3 is used as our exemplary ceramic test system for phosphate binding, although several other ceramic chemistries have also been explored. A mix of micro‐ and nano‐sized α‐Al 2 O 3 powders are investigated due to possible differences in chemical binding 35,36 . Smaller nanoparticles can also more efficiently pack a green body by filling voids between micro‐sized particles 37 .…”

“…A mix of microand nano-sized α-Al 2 O 3 powders are investigated due to possible differences in chemical binding. 35,36 Smaller nanoparticles can also more efficiently pack a green body by filling voids between micro-sized particles. 37 Nominally, mixtures of 50 nm (99.5%, Sigma-Aldrich) and 100 nm (99.99%, MSE supplies) α-Al 2 O 3 powders as well as a 10 μm α-Al 2 O 3 powder (99.5%, Sigma-Aldrich) were used in this work (33 wt% of each).…”

Research on the Production of Pigments Based on Composite Pellets in the Recycling of Industrial Waste

“…There is a known method for producing iron-containing inorganic pigments from technogenic waste [7][8][9][10][11]. Among the most demanded iron-containing pigments are iron oxide pigments, the color of which is mainly determined by the features of their composition and structure.…”