Selective melting by induction

Carbon nanotubes (CNT) multi-wall tube 9.5 nm (diameter) 1.5 gm (length) 

Current flow Water flow Control signal 

Nickel as well as magnetite shows a heating effect. Nevertheless, the effectiveness is lower than for iron particles, on the one hand. On the other hand, the chemical reactivity, including the corrosion effects of iron, make the material unsuitable for most applications. This is why the study was focused on iron, which gives the best heating effect, and magnetite, which delivers the best possibility for a later implementation in an industrial application. 

The higher filler degrees of iron material (10 and 20 wt%, respectively) deliver higher heating rates of up to 9 K/s, but they are unsuitable for the use in a polymer-polymer compound, since the amount of particles has to be reduced to a minimum to preserve its self-reinforced state. 

For a further reduction of filler degrees, heating experiments were continued with an additive content of less than 5 wt%. As calculated and predicted by the use of the measrued loss energy by Hergt et al [8], a material melting could not be achieved under 5 wt% with the selected material combination within a reasonable time. This implies that an application which uses inductive heatable material, has to accept a certain amount of contamination by heating promoters of at least 5 wt% within the matrix phase. 

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