Why magnesium alloy????

Started Apr 19, 2013 | Discussions thread
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Re: Why magnesium alloy????
In reply to golf1982, Apr 21, 2013

Message for all plastic-fantastic agents:

Don't see Discovery channel and don't drink too much.

Material choice never made by only one parameter, it is complex value including tension and compression strength, expansion factor, chemical stability, poison gas emission etc.

All composite plastics emits poisonous gases while in low quantities, have not uniform direction strength, very difficult to mill and no dimension precision. They're perfect for simple forms covers and panels. In Airspace technology they used not as chassis, but as linear and honeycomb fill to some parts. Parts of wing sections in aircraft isn't made of plastic, but from composite 'sandwich' including layers of pre-taut fiber net in epoxy resin fill. They are simple panels, tubes.

When aircraft manufacturers need strong box as in centerplane section or chassis base they used titanium or magnesium milled boxes. So never any serious equipment use plastic as structure material. It was and still is. (computer servers, concentrators, printers, any non-home components still made of steel).

There is another very important reason: heat dissipation. Lots of electronic cirquits inside of reasonably fast camera need heat transfer. No plastic can provide it so no fast, professional camera in plastic box.

So magic fiberglass, carbon-fiber, kevlar, carbon nanotubes etc. still found exotic, highly restricted usage mainly for outer panels and as destructible shields. At least in our millenium. All other is bad journalism and non-science fiction.

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