Three-dimensional numerical investigation on micro-meter droplet impact and penetration into the porous media with different velocities

Droplets impacting and penetration into porous media is commonly seen in natural and engineering processes, in which the kinetics and capillary effect are of great importance to the lateral spreading and vertical penetration. In this study, a three-dimensional numerical simulation method was proposed to study the micro-meter droplet impact and penetration into the porous media. It is found that both the lateral spread and vertical penetration occur on the millisecond timescale and larger velocity will enhance the lateral spreading but have little influence on the penetration time and depth. The direct numerical method proposed in this study can be applied to predict the actual spreading and penetration status in the droplet-powder system and further insight into the droplet-powder interaction.

Dynamic Molding Deposition: The additive manufacturing in partially ordered system

Additive manufacturing (AM) is now identified as a powerful bundle of fabrication techniques. Limitations were identified to be mostly related to the availability of reformulated materials compatible with existing AM technologies. What if we were able to dynamically generate sacrificial molds with unlimited architectures and material composition? We have discovered such a process, called Dynamic Molding Deposition (DMD) in partially ordered powder system and demonstrated its capacity to produce highly complex objects with 100 µm resolution, without any building plate or support structures. The DMD compatible materials were shown to be almost infinite, from low to high viscosity, from thermoplastic to elastomers. Our process enables us to build unexpected composite objects made up of injection material and powder grains from the dynamic mold. This feature opens the path to a complete new field of research and applications.

Nanocomposite coating with high microhardness based on the agglomerated Kh20N80-WC powder system

This article explores the characteristic and particular features of manufacturing nanostructured composite coatings with high microhardness from agglomerated powders of Kh20N80-WC system manufactured by high-speed mechanosynthesis. The properties of the functional coatings deposited by both supersonic cold gas-dynamic and microplasma spraying are studied.