TITK enhances electromagnetic shielding of composites
25 October 2006 – Enhancement of the electromagnetic shielding properties of conductive thermoplastic composites has been achieved by the TITK Thuringia institute for textile and plastics research institute through the addition of ceramic powder. The process uses strontium barium titanate powder with a high dielectric constant which is added to conductive thermoplastic composites.
TITK’s work has been aimed at overcoming the low efficiency in shielding against electromagnetic waves and fields of polymer composites containing conductive fillers. It says it has found the key to the solution by the addition of ferro-electric components based on strontium barium titanate to steel fibre filled plastics, as well as to composites filled with metallised synthetic fibres.
Apart from the penetrating conductive path through the material provided by the steel or metallised synthetic fibres, TITK says that polarised micro domains are created through the addition of the ferro-electric ceramic powder so that magnetic waves and fields are weakened further while passing through the plastic composite.
Among the results achieved, the shielding effectiveness of 10% stainless steel fibre filled ABS was enhanced from 21.6-52.5 dB at 50-1,000 MHz to 29.7-61.7 dB when the ceramic powder was included in one case.
