Direct shaping of oxides by laser insolation of transition metal oxalates

Abstract

Films of copper and cobalt-iron oxalates were prepared from suspensions of powders in ethane-1,2-diol deposited on glass or polycarbonate substrates. Two-dimensional structures of oxides, resolved on the scale of less than ten micrometers, were formed by laser insolation of these films, using a photolithography machine. The nature of the constitutive phases of the oxides formed tends to show that the laser heating makes it possible to reach locally, temperatures higher than 1000 • C. The oxides formed are thus sintered. The residual oxalate can be removed by washing or dissolving, leaving the oxide structure on its substrate. In spite of a perfectible sintering, the formed structures could interest different technological applications (electronic or magnetic devices, gas sensors, photovoltaic systems.. .) requiring the shaping of simple or mixed oxides on a scale close to the micrometer. The process of selective laser decomposition of oxalates, could subsequently be suitable for additive manufacturing of 3D parts.

Co‐Precipitation of Fe−Cu Bimetal Oxalates in an Aqueous Solution and Their Thermally Induced Decomposition

“…Moreover, the morphology of the particles transformed from cuboids to small discs. Similar discs were previously observed in the case of copper oxalate particles [65] …”

A multimaterial based on metallic copper and spinel oxide made by powder bed laser fusion: A new nanostructured material for inert anode dedicated to aluminum electrolysis

“…10 6 J. m −2 from Danezan et al (2018)). Very high temperatures or local melting have also been achieved by diode laser heating of γ Fe 2 O 3 films or oxalate layers, according to the work of Bouet et al (1999) and Pasquet et al (2017). For the samples obtained at the lowest laser powers, the high porosity within the zones consisting mainly of oxides (Figs.…”

Selective laser powder bed fusion for manufacturing of 3D metal-ceramic multi-materials assemblies

“…According to Corbin [28], these phases could form by reaction between liquid aluminum and air around 1500 °C. It is therefore not surprising to detect their presence in samples obtained by laser fusion, since it has already been shown that such temperatures are exceeded during the additive manufacturing of ceramic-metal composites [29] or laser decomposition of metal organic compounds [30] [31]. A very low intensity peak also suggests the existence of traces of aluminum nitride.…”