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Blancpain

Aluminium

 

TM.

My guess on the choice of materials:

Aluminium: It's light. But it would need a surface treatment of some sort. Plus it's easy to machine etc. Though I wonder about the coeff of expansion. Also, it's something "new", so it provides, as you wrote, some marketing R&D, different for the sake of difference.

Forged carbon is basically compression moulded plastic with some Carbon strands thrown in. So technically...no idea. It's just Plastic. Different for the sake of difference.

Titanium: Pain to machine. It's light though.

Brass: easy to machine, inexpensive material. Heavy.

In essence, the use of new materials for structure should see the design optimised to take advantage of the material (eg a spiderweb of carbon fibre spars linking the pivots similar to a skeletonised movement), but even then unless you see a change in layout, I cannot see any practical advantage. And the layout for watch drivetrains is quite static.

Some (way out) ideas for how improvement/different materials might be done for more Substantive reasons:

No jewels: form the plates from a material providing the surface finish of jewels where the pivots reside. Less parts, same performance. Might have some problems with brittleness Might not be that good for the marketing guys though...

Self-healing case: no more scratches, they are attempting this with paint....

 

 

 

 

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