Available Technology

A Versatile Three Dimensional Printing Approach

Constructing and using a conductive filament in various applications of 3D printing
Several design challenges have hindered use of conductive materials in commercial 3D printing. One such obstacle is the heating requirements for formation of an object to be fabricated using a 3D printing approach. Conductive materials and additives often have relatively high melting temperatures, usually above 250 degree Celsius (C) and above the melt temperatures of plastic filaments, such as Acrylonitrile Butadiene Styrene and Polylactic Acid that are often extruded by 3D printers. This requires substantial energy input and requires heavy thermal insulation to minimize loss of the heat energy. Another obstacle is fabrication of the conductive filament itself. This invention from NASA embodies: (a) Polycaprolactone ( (C6H10O2)n, referred to as "PCL"), an attractive polymeric material for use in forming a conductive filament. PCL is biodegradable, with a melt temperature of T(melt) = 60 degree C, has good resistance to presence of water, oil, solvent and/or chlorine, and does not produce an abundance of toxins when heated. (b) A filament extruder, that includes PCL and carbon black powder or graphene, which is conductive and has a relatively low melt temperature. (c) A flow cell battery that is 3D printed using vanadium-based material. And, (d) a honeycomb structure that is formed using 3D printing of silk fibroin and/or chitosan hydrogels into biocompatible polymer networks, which can further be used as supporting framework in 3D bioprinting.
Abstract: 
NASA has developed a versatile method and associated apparatus for constructing and using a conductive filament in various applications of 3D printing. It uses an attractive polymer formulation, which exhibits low melting temperature, even when combined with conductive material, as the printing filament material. It may be used with a commercial 3D printer to generate custom 3D conductive geometries such as integrated circuitries, electrical connectors, supercapacitors, and flow cell batteries. This invention can be used to create conductive, piezoelectric or multifunctional materials using three dimensional printing, with relatively low melt or glass transition temperatures. This invention should be useful wherever such materials are needed, with modest fabrication costs.
Benefits: 

Low melt or glass transition temperatures

applications: 

Commercial 3D printing

Aerospace industry

Electrical and Electronics industry

Reps: 
Patent Number: 
Internal Laboratory Ref #: 
TOP2-257
Patent Status: 
Patent Issue Date: 
November 21, 2015
Agency
NASA
Region
Far West
State: 
California
Lab Representatives
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