Re: [Leica] Lens wt vs finish->Now question about titanium

["Bruce R. Slomovitz" <brslomo@erols.com>]

Rick,

Normally the term micrometer is used to denote a measuring instrument or
device.  However you are correct that a micron is a micro-meter. When one
wishes to refer to this unit of measurement without using the term "micro=
n",
then it is customary to use either the abbreviation Mm or the symbol "=B5=
m".

Bruce S.
- -----Original Message-----
From: Rick Floyd <rick_floyd@hotmail.com>
To: leica-users@mejac.palo-alto.ca.us <leica-users@mejac.palo-alto.ca.us>
Date: Sunday, September 20, 1998 7:34 AM
Subject: Re: [Leica] Lens wt vs finish->Now question about titanium


>I don't mean to be argumentative.  But I think it's a plasma rather than=
 a
>vapor and I think you mean 10 to 100 micron.
>
>Bruce:
>
>I didn't take your response as being argumentative.  However, let me be
more
>complete in my response and our discussion.  What we are really talking
about
>is Physical Vapor Deposition (PVD) processes.  In other words, a deposit=
ion
>process in which atoms or molecules of material are vaporized from a sol=
id
or
>liquid, transported in the form of a vapor through a vacuum or low press=
ure
>environment, and condensed on a substrate.
>
>PVD processes consist of the following techniques:
> 1. vacuum evaporation
> 2. sputter deposition in a plasma environment
> 3. sputter deposition in a vacuum
> 4. ion plating in a plasma environment with a thermal evaporation sourc=
e
> 5. ion plating in a plasma environment with a sputtering source
> 6. vacuum ion plating or ion beam assisted deposition (IBAD)in a vacuum
>environment with a thermal evaporation source and ion bombardment from a=
n
ion
>gun.
>(See: Metal Finishing Handbook '97 - PVD Processes by Donald Mattox -
Society
>of Vacuum Coaters - pg399)
>
>PHEWWWWWW!  But, as you can see from above, all are vapor deposition
>techniques of which some will use a plasma.  You are probably correct in
>assuming the use of a plasma technique with titanium.  But it is not alw=
ays
>the case.
>
>By the way, a micrometer IS a micron.  See the same reference book above=
,
on
>page 812 for verification.
>
>My company makes two glow discharge (plasma) optical spectrometers for
>quantitative depth profiling of coatings on substrate materials.
>
>Best Regards,
>Rick