By Nickx - 6/3/2020 5:00:53 PM
Hi all ,i'm Nick new to this forum and i like to ask some advice on the problems i'm having with making parts out of carbon fiber.
I only worked a little with polyester and glassfiber in the past and just recently started using epoxy and mold making with the Easy composites products.
I made some paterns and molds for a automotive airduct using the easy composites putty and gel coat.
Sadly enough i had to modify the molds and made some repair spots with the gel coat.The mold has several pin holes ,mostly around corners.
I asked the easy composites staff before if i could repair the pinholes and they said i could either try to fill them with epoxy gel coat or leave them as is .
They said the release wax will fill in the pin holes anyway.Well that isn't true from my experience.
I started with a test piece and used 4 layers of 280gr/m² of glass fiber and epoxy resin .I initially wanted to do just a wet lay up but also wanting to try out some vacuum bagging if possible.
With the test piece i got some trouble of the fiber cloth not staying into the corners ,so after the 4 layers i decided to use a storage vacuum bag and some peel ply and breather cloth to keep the glass fiber into the corners.
This worked out pretty good except the surface had pin holes and some blisters.(the epoxy i used needed a post curing of 15h at 60°C) and i think air got trapped and with post curing it made a blister.
I decided to order some new epoxy and some non shift 200gr/m² carbon fiber and try this again .The non shift carbon could be preformed by heating it a little so i thought this would help with keeping the carbon fiber into the corners.
This actually worked much easier then the glass fiber of 280gr/m² ,The corners still had to be pushed in to keep them in.
This resin also required post curing and i think there was air between the carbon fiber and the first layer of epoxy. which also gave me blisters.
To be clear i laid a layer of epoxy resin in the mold ,let it cure untill sticky and then laid down the carbon fiber reinforcement with peel ply and breather cloth and bagged the whole thing into a vacuum storage bag.
Should i look into going over to vacuum infusion and use a proper vacuum pump to get better results without blisters?
What can i do to remove the pinholes from the mold without making a entire new mold?
 
        
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By taimur - 6/13/2020 1:34:02 PM
Good work, You made a different look on it.
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