50 yrs. of Star Trek!
Guy Sotomayor Jr
ggs at shiresoft.com
Fri Sep 9 15:36:49 CDT 2016
> On Sep 9, 2016, at 1:23 PM, Doug Ingraham <dpi at dustyoldcomputers.com> wrote:
> On Fri, Sep 9, 2016 at 12:39 PM, Peter Cetinski <pete at pski.net> wrote:
>>> On Sep 9, 2016, at 10:55 AM, Doug Ingraham <dpi at dustyoldcomputers.com>
>>> Transparent aluminum exists. It is called sapphire. Sapphire is the
>>> crystalline form of aluminum oxide. If you recall, Apple was thinking of
>>> using it for the touch screen face of the iphone.
>> Ah yes, but can you make in sheets 60 feet by 10 feet by 1 inch thick and
>> withstand the pressure of 18,000 cu ft of water? :)
> The answer is probably yes, but not for anything like a reasonable amount
> of money or in a reasonable amount of time. It would probably take a
> couple of years to grow a crystal that size. There was a company making
> the ovens used to make billets of sapphire about 18 inches in diameter and
> a foot tall from which they would cut out the pieces they would need with
> presumably a diamond saw. These billets would take something like a month
> to grow so you would need a lot of them to make your screens in the multi
> million quantities. And these billets had imperfections you had to work
> around. In 1986 it would probably have taken Mr Scotts technical know how.
Actually it actually *does* exist and is reasonable to manufacture. Here’s the
It’s basically a sintered process where the ceramic is formed (this particular one is called spinel)
and the process is to put the powder in a press, raise the temperature and evacuate the air.
The result is a clear crystal that has better properties than glass. The size of the piece is only
limited by the size of the press.
TTFN - Guy
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