- Jun 27, 2015
- capital district NY
FWIW, a UK site lists the price of the graphene powder as about $185 per kg, but at the mixing rate specified above (0.17% by weight), 1 kg of the stuff should make almost 600 kg of finished CF/epoxy laminate. So, a few small airplanes. They sell samples of 250g for about $90, which would be enough for approx 330 lbs of final laminate at the above listed proportions."Using a compression moulding technique, Carbon Fiber fabric was impregnated with our Graphene-Modified Epoxy Resin to develop composites. Graphene GS possesses distinct functional groups which strengthen interactions with the epoxy resin and carbon fibers.
The final composite showed an increase in tensile-shear strength of +122%, Compressive strength increase of +30%, increase in flexural strength of +73% and flexural modulus of +87%. Interlaminar shear strength increased by +31% when just 0.17% graphene (by weight) of graphene GS was included in the carbon fiber reinforced polymer composites.
The enhancements of the properties of composites are due to mechanical interlocking of graphene oxide with carbon fibers and the epoxy resin.
Graphene GS utilization is an approach for improving the properties of carbon fiber and glass fiber polymer composites.
Incorporation of 0.1% (by weight) of graphene GS in glass fibre/ epoxy exhibited a +56.2% improvement in flexural strength.
A +42% increase in flexural modulus is achieved by adding graphene GS as the secondary reinforcement to glass fiber composites."
Geezus - how the hell do you work safely with the stuff?I expect the webinar is a sales pitch and will be way over my head, but it could be interesting.
A blurb from another site:
FWIW, a UK site lists the price of the graphene powder as about $185 per kg, but at the mixing rate specified above (0.17% by weight), 1 kg of the stuff should make almost 600 kg of finished CF/epoxy laminate. So, a few small airplanes. They sell samples of 250g for about $90, which would be enough for approx 330 lbs of final laminate at the above listed proportions.
Also, it would be very wise for anyone considering messing with this stuff to read up on nanoparticles and the hazards they might present. There's some evidence that the normal defenses our bodies employ are not effective at filtering out/getting rid of these unnaturally small particles, and that they can cross many biological barriers and remain inside organisms. Even particles that are not chemically active can cause mechanical damage to various structures, possibly including DNA. Most filters normally found in shops cannot protect against nanoparticles. Anyway--do your research and be aware that there are big gaps in our understanding of the health impact of some of these materials. Here's a sample of some of the research.
I really don't know much about it. The vendor sells it as a powder and as a water-borne paste. Obviously, of those two, we'd need the powder.Can it be pre mixed with one part of the resin before purchase? Or is it still dangerous at that stage?
Yes, I do, too. It seems a bit too much like magic ("psst--spend $100 for 8 oz of this powder and you'll have enough to do your whole plane. You can reduce the amount of CF in your layups by 30%--saving a lot of weight and $$ in carbon fiber and epoxy"). Still, there could be something to it. I'd like to be sure there are no long-term issues, and maybe the best way to know about that is to see if the big airplane makers are using it.I still think it is interesting stuff.
It could be, but airplane design from major manufacturers is very conservative. That's what I want. If an ATV's fender develops a crack in 20 years, it's not going to bring down the company. If the stabilizers on Boeing's 7X7s start snapping off--that's serious.Maybe it is in boats, atv's or other stuff?
Hereby the summary of the graphene webinar, orginised by The Graphene Council, presented by Terrance Barkan.Please provide a summary/report if you can.