A material touted for years for high conductivity raises questions
With a study on graphene's conductivity as it relates to electric motors being produced, a feeling of deja vu arises. A colleague with over 40 years of experience in the industry recently told me the following:
"I recall hearing speakers talking about graphene as an electrical conductor ten years ago or more at CWIEME Rosement. I think people were finding back then that using graphene often didn't justify the relatively high cost of the material. With trusted accuracy from that decade-old report, it's safe to say graphene is a questionable material now. Here's the latest, from Phys.org:
"A study, led by Tingting Zuo, was based on the idea of in-situ growth, and a series of Cu/Gr composites with improved interfaces were prepared by vacuum hot press sintering. Combined with cold-drawing and heat-treatment processes, composite wires with extremely high strength and electrical conductivity at both room and elevated temperatures were obtained."
The findings are published in the journal CES Transactions on Electrical Machines and Systems. The temperature coefficient of resistance (TCR) of the wires was drastically reduced to 0.0035/°C, which makes the wires exhibit low resistivity at higher temperatures.
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