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  #16  
Old 02-11-2005, 05:22 PM
Horshu Horshu is offline
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On the Texalium chassis, it's actually a 3-layer (per-side) sandwich: carbon fiber, fiberglass, aluminum, so the carbon and aluminum aren't actually in contact. According to Hexcel's (and Robot Combat), the Texalium itself is fiberglass laminated with aluminum. The sheets are a combination of carbon fiber with Texalium around it.
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  #17  
Old 02-15-2005, 06:27 PM
Turnination Guy Turnination Guy is offline
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This is very helpful information for worries about surface problems; fiberglass is a very recommended material for lying between carbon fiber and aluminum. But as I’ve said before, the main concern is about holes drilled through the material (where aluminum parts & fasteners can interact directly with the carbon fiber). Aluminum parts (and other metals high on the galvanic scale) should be separated and sealed from the carbon fiber by electrically insulating material.

What you are bolting to what is the common sense part. How you are bolting compatible materials together and how you separate materials you KNOW are incompatible is the sticky part.
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  #18  
Old 02-15-2005, 06:47 PM
Horshu Horshu is offline
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I think a thin layer of rubberized spray would work. Maybe put masking tape on the underside of the car and cut out the screw holes. Put down about 3 thin layers and take the tape off. I wish I had a spare one to try that on. I ordered some texalium sheets, so I can make a spare, I guess, esp since I could always use spare knuckle plates.
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  #19  
Old 02-17-2005, 07:07 PM
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Knuckle plates.............lower suspension plates for the X-Frame are available upon request............e-mail me
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  #20  
Old 02-18-2005, 08:46 AM
Draconious Draconious is offline
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Carbon + Aluminum...

This is only a factor if the carbon and aluminum are in contact... so the resin in the carbon should be plenty enough barrier to keep them apart, no paper should be needed... the screws however should be non alum, shoudl be steel or titanium or something better...
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  #21  
Old 02-26-2005, 02:00 PM
Turnination Guy Turnination Guy is offline
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Horshu and Draconius, again you are missing the point. The point is that we have things like aluminum knuckles passing through holes we have drilled into carbon fiber materials, which bypasses any outside protection completely. The INSIDE of the CF sandwich is at risk. So what has to be done is we have to insulate the inside of the sandwich by passing an insulating tube through the knuckle hole; and this tube would have to be thick enough for the knuckles to slide through them effortlessly. And in this particular case, rubberized insulation would be a bad call, since the knuckle has to give freely.
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  #22  
Old 02-27-2005, 01:08 PM
Horshu Horshu is offline
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How about a thin layer of clearcoat enamel, with everything but those holes masked? The clearcoat would be slick, and with it being enamel, it should be durable. I just got a sheet of tex from robotcombat, and it's got a clearcoat on one side, so it would be seamless in appearance as well. I'm still rubberizing the CF edges, though, as I want scratch resistance.

Last edited by Horshu; 02-27-2005 at 01:13 PM.
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  #23  
Old 03-15-2005, 02:14 AM
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color0 color0 is offline
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this thread is kinda old, but i need to ask a question:

aren't all the gpm parts anodized? and even if not, aluminum will form a thin coat of aluminum oxide on top that will prevent further rusting. so... would carbon fiber and aluminum oxide put together have adverse effects? 'cause if the answer is 'no', then there's no issue at all...
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  #24  
Old 04-06-2005, 06:09 PM
Turnination Guy Turnination Guy is offline
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That is exactly the problem, color0. Aluminum and Carbon Fiber are sufficiently different galvanicly that aluminum will corrode Carbon Fiber when it is in contact with it (under fairly common conditions).
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