Why magnesium alloy????

Started Apr 19, 2013 | Discussions thread
Shop cameras & lenses ▾
Regular MemberPosts: 362Gear list
Re: Why magnesium alloy????
In reply to BartyLobethal, Apr 21, 2013

BartyLobethal wrote:

krikman wrote:

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.

The Boeing 787 is 80% carbon-fibre reinforced plastic composite by volume. This is the primary material used in the fuselage barrel sections.

-- hide signature --


It perfectly fits my conclusions: most of the outer panels and bulkhead consist of composite materials, while platforms for mashinery and key elements made of titanium and alumnium. Proportion nearly same as for current D4 class body. They have 80% by volume plastic and rubber too...

Reply   Reply with quote   Complain
Post (hide subjects)Posted by
(unknown member)
(unknown member)
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark post MMy threads
Color scheme? Blue / Yellow