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The amount of titanium in the iPhone is about a 1-2mm band around the outside. The inner chassis is still aluminum, and they are diffusion bonded together. Whil
by oflannabhra 3y ago
The amount of titanium in the iPhone is about a 1-2mm band around the outside. The inner chassis is still aluminum, and they are diffusion bonded together. While that Ti is at the primary thermal boundary for the metals in the phone, I would guess (judging from experience with both stainless steel and titanium banded phones) that most heat escapes through the glass front and back of the phone, even though they have poor conductivity.
- AlanYx 3y ago>...most heat escapes through the glass front and back of the phone, even though they have poor conductivity. Some does, but given glass' very poor thermal conductivity (1.38 W/(m·K)), heat dissipation by the band around the outside is probably a very significant factor in total heat dissipation.
- kaba0 3y agoThere is usually a rubber case around all of the metal, so I do think that phones should be able to operate only with heat escape through the front glass alone.
- oflannabhra 3y agoRight, but the surface area of the glass and the proximity to the heat source more than make up for this. Just hold a phone under load and it’ll be obvious. I’m sure Apple has much more in depth studies of the thermal characteristics of their product than I can armchair analyze, though.
- layer8 3y ago> The amount of titanium in the iPhone is about a 1-2mm band around the outside. Just to confirm, it’s almost exactly 1 mm, and the aluminum part it’s welded to adds about another millimeter: https://youtube.com/watch?v=S_W73ouKtjU&t=9m44s https://youtube.com/watch?v=S_W73ouKtjU&t=9m44s (That’s for the Pro Max. The Pro could conceivably be slightly less.)