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- W2019977032 abstract "The concept of graphite?polyurethane coatings as efficient, electrical resistors is the focus of this paper. A 60?40 graphite?polyurethane mix (weight %) demonstrated an electrical resistivity of 40.71???mm. The graphite?polyurethane mix was coated on electrically insulating Kapton tape, which was then wrapped on a nichrome wire (nominal dimensions: 100?mm length and 1.5?mm diameter). This three-phase assembly was heated by Joule heating of the graphite?polyurethane layer. Steady state temperatures as high as 180??C were attained under free convection conditions, at a very low power requirement of about 2.5?W as opposed to about 18?W for uncoated wires. Interestingly, the effect on transients (heating and cooling times) was not as dramatic. Experiments were also performed under vacuum conditions, following which an analysis is offered regarding the different modes of heat transfer. These coatings can potentially be used as efficient resistors for highly conductive, moderately high temperature shape memory alloys (e.g.?the copper?aluminium?nickel system) or electrically insulating shape memory polymers. Any other thermally activated shape memory alloy (e.g.?the popular nickel?titanium system) may also use the coatings as resistors due to the potentially dramatic energy savings that may be realized without a dramatic adverse impact on the frequency response." @default.
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- W2019977032 date "2007-01-15" @default.
- W2019977032 modified "2023-09-24" @default.
- W2019977032 title "Energy efficient graphite–polyurethane electrically conductive coatings for thermally actuated smart materials" @default.
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