开云体育

Hi James,
Visual appearance can be very deceiving. I can do a run or two and
some testing, no problem. I have found pure aluminum to be as high as
90% and sometimes 91%. I usually get a better coating by pumping down
to about 1X10-6 Torr before coating. I have seen coatings done with
1X10-3 Torr.

With silver, its very important to have fine overcoats for
protection. I always finish off with amorphous(non crystalline)
materials such as SiO2 or SiO.

In talking with others, I have found that the smoothest aluminum
coats are done at room temperature. The reason I use chromium is
because its the universal thin-films bonding material. It requires
special materials to strip it. Most acids won't touch it.

Our machines have very rapid cycle times. Pump down is about 15
minutes. We may be coming into a number of powerful roughing pumps at
very low prices from Boeing Surplus in Seattle. I'll let you know
about them. These are capable of 4X10-4 Torr.

We run our Cryos at about 10 Kelvin.

Al M


--- In VacuumX@..., "James Lerch" <jlerch1@t...> wrote:

Hi Al,

Looks like you have some seriously nice 'Toys' there! :)

I have a few questions if I may,

Any pictures? Especially ones documenting the E-beam layout,

distance from source to target, number of sources, Chamber details,
etc..

Can you tell us some more about this optical thickness monitoring

method? (links are fine, just curious about the theory behind it..)

If you ever have some free time, might you consider evaporating

some of my 'secret sauce' (aka Reynolds Wrap, ~100nm thick) onto a
surface and measure its reflectivity for me? Since I'm pretty much
financially stuck with Tungsten thermal sources (there cheap!) I'm
left to play with only single layer coatings. So far my 'secret
source' (an alloy of Al, Fe, SI) physically appears superior to pure
Al in many ways (good adhesion, very few pinholes (often none), and
significantly more resistant to scratch/sleeks during intentionally
torturous cleanings), however I have often wondered about its
reflectivity... (it looks shiny :)

Protected Silver, WOW! That's a visible wavelength dream come

true :)

Thanks,
James Lerch
(My telescope construction,testing, and

coating site)

----- Original Message -----
From: sloanpk2000
To: VacuumX@...
Sent: Monday, March 31, 2003 9:54 AM
Subject: [VacuumX] New Member - Al M Sirius Optics


Hi,
This is an imteresting group. I have been involved in thin films

for

about 20 years.

We have 3 E-beam systems, utilizing cryo-pumps for deep vaccum.

Other

equipment includes spectrometers, photometers, and
spectralradiometers. We use crystal monitoring for thickness
monitoring. We are now placing and optical monitoring system for
improved accuracy. The E-beam power supplies are 2 10KV an 1

14KV

system. We feed these power supplies with 3 phase 220V at 100Amp.

Two

of them are air-cooled. The 14KV system is water cooled.

I usually design and make interference filters. This weekend, I
coated 12 mirrors from 6" to 10" in size and about 50 diagonals.

I found an interesting combo of layers that I really like. It

starts

with about 20nm of Chromium, followed by 130nm of Aluminum and
finished with 4 layers of Tantalum Pentoxide(Ta2O50) and SiO2 for
enhancement and protection. I get about 94% reflectivity with

this

combo. I find that very few people use Ta2O5.

I found that the thin Chromium layer all, but eliminates

pinholing.

The Ta2O5 is an extremely adherent material and combines very

well

with SiO2. I have silver mirrors that I coated the same way. I

have

one mirror in my MN56 that is over 3 years old and is still like
brand new. The reflectivity of that mirror is about 97%.


Al M

James,

If you can do it a stack for a silver mirror that is reported to be
highly stable is:


Glass - NiCrNx (8?) - silver (1200?) - NiCrNx(2-8?) - SiNx (100?)
[146a]. The NiCrNx seems to act as a nucleating layer for both the
silver and the SiNx protective layer.

146a. J.D. Wolfe, R.E. Laird, C.K. Carniglia and J.P Lehan, p. 115 in Technical
Digest OSA, Optical Interference Coatings Conference (1995); also
P.D. Fuqua and J.D. Barrie, "Optical Properties and Corrosion
Resistance of Durable Silver Coatings," p. 85 in Properties and
Processing of Vapor-Deposited Coatings, edited by R. Johnson, W. Lee,
M. Pickering, B. Sheldon, Material Research Society Proceedings, Vol.
555 (1998)

Regards,

Don Mattox

Hi Al,

Looks like you have some seriously nice 'Toys' there! :)

I have a few questions if I may,

Any pictures? Especially ones documenting the E-beam layout,
distance from source to target, number of sources, Chamber details,
etc..

Can you tell us some more about this optical thickness monitoring
method? (links are fine, just curious about the theory behind it..)

If you ever have some free time, might you consider evaporating some
of my 'secret sauce' (aka Reynolds Wrap, ~100nm thick) onto a
surface and measure its reflectivity for me? Since I'm pretty much
financially stuck with Tungsten thermal sources (there cheap!) I'm
left to play with only single layer coatings. So far my 'secret
source' (an alloy of Al, Fe, SI) physically appears superior to pure
Al in many ways (good adhesion, very few pinholes (often none), and
significantly more resistant to scratch/sleeks during intentionally
torturous cleanings), however I have often wondered about its
reflectivity... (it looks shiny :)

Protected Silver, WOW! That's a visible wavelength dream come true :)

Thanks,
James Lerch
<> (My telescope
construction,testing, and coating site)

----- Original Message -----
From: <mailto:amisiuk@...>sloanpk2000
To: <mailto:VacuumX@...>VacuumX@...
Sent: Monday, March 31, 2003 9:54 AM
Subject: [VacuumX] New Member - Al M Sirius Optics

Hi,
This is an imteresting group. I have been involved in thin films for
about 20 years.

We have 3 E-beam systems, utilizing cryo-pumps for deep vaccum. Other
equipment includes spectrometers, photometers, and
spectralradiometers. We use crystal monitoring for thickness
monitoring. We are now placing and optical monitoring system for
improved accuracy. The E-beam power supplies are 2 10KV an 1 14KV
system. We feed these power supplies with 3 phase 220V at 100Amp. Two
of them are air-cooled. The 14KV system is water cooled.

I usually design and make interference filters. This weekend, I
coated 12 mirrors from 6" to 10" in size and about 50 diagonals.

I found an interesting combo of layers that I really like. It starts
with about 20nm of Chromium, followed by 130nm of Aluminum and
finished with 4 layers of Tantalum Pentoxide(Ta2O50) and SiO2 for
enhancement and protection. I get about 94% reflectivity with this
combo. I find that very few people use Ta2O5.

I found that the thin Chromium layer all, but eliminates pinholing.
The Ta2O5 is an extremely adherent material and combines very well
with SiO2. I have silver mirrors that I coated the same way. I have
one mirror in my MN56 that is over 3 years old and is still like
brand new. The reflectivity of that mirror is about 97%.


Al M


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____________________________________
Donald M. Mattox
Technical Director
Society of Vacuum Coaters
71 Pinon Hill Place NE
Albuquerque, NM 87122-1914

Telephone 505/856-7188
FAX 505/856-6716
E-mail donmattox@...
WebSite

Hi,
I have also silver coated glass and used Zirconium Dioxide(ZrO2) and
SiO2 as enhancing layers. ZrO2 is wickedly tough and requires a great
deal of power to evaporate. The chamber become very hot after
evaporating ZrO2. I have done a few of these for friends and it seems
to have an indefinite life. I feel that its very important to have
multiple layers to fully protect silver.

I may try the Reynolds Wrap aluminum later this weeks. I'll need
about 200g to place in the crucible. I may just melt it in the kiln.


Al M



--- In VacuumX@..., SVC <donmattox@s...> wrote:

James,

If you can do it a stack for a silver mirror that is reported to be
highly stable is:


Glass - NiCrNx (8?) - silver (1200?) - NiCrNx(2-8?) - SiNx (100?)
[146a]. The NiCrNx seems to act as a nucleating layer for both the
silver and the SiNx protective layer.

146a. J.D. Wolfe, R.E. Laird, C.K. Carniglia and J.P Lehan, p. 115

in Technical

Digest OSA, Optical Interference Coatings Conference (1995); also
P.D. Fuqua and J.D. Barrie, "Optical Properties and Corrosion
Resistance of Durable Silver Coatings," p. 85 in Properties and
Processing of Vapor-Deposited Coatings, edited by R. Johnson, W.

Lee,

M. Pickering, B. Sheldon, Material Research Society Proceedings,

Vol.

555 (1998)

Regards,

Don Mattox

Hi Al,

Looks like you have some seriously nice 'Toys' there! :)

I have a few questions if I may,

Any pictures? Especially ones documenting the E-beam layout,
distance from source to target, number of sources, Chamber

details,

etc..

Can you tell us some more about this optical thickness monitoring
method? (links are fine, just curious about the theory behind

it..)

If you ever have some free time, might you consider evaporating

some

of my 'secret sauce' (aka Reynolds Wrap, ~100nm thick) onto a
surface and measure its reflectivity for me? Since I'm pretty

much

financially stuck with Tungsten thermal sources (there cheap!) I'm
left to play with only single layer coatings. So far my 'secret
source' (an alloy of Al, Fe, SI) physically appears superior to

pure

Al in many ways (good adhesion, very few pinholes (often none),

and

significantly more resistant to scratch/sleeks during

intentionally

torturous cleanings), however I have often wondered about its
reflectivity... (it looks shiny :)

Protected Silver, WOW! That's a visible wavelength dream come

true :)

Thanks,
James Lerch
<> (My

telescope

construction,testing, and coating site)

----- Original Message -----
From: <mailto:amisiuk@w...>sloanpk2000
To: <mailto:VacuumX@...>VacuumX@...
Sent: Monday, March 31, 2003 9:54 AM
Subject: [VacuumX] New Member - Al M Sirius Optics

Hi,
This is an imteresting group. I have been involved in thin films

for

about 20 years.

We have 3 E-beam systems, utilizing cryo-pumps for deep vaccum.

Other

equipment includes spectrometers, photometers, and
spectralradiometers. We use crystal monitoring for thickness
monitoring. We are now placing and optical monitoring system for
improved accuracy. The E-beam power supplies are 2 10KV an 1 14KV
system. We feed these power supplies with 3 phase 220V at 100Amp.

Two

of them are air-cooled. The 14KV system is water cooled.

I usually design and make interference filters. This weekend, I
coated 12 mirrors from 6" to 10" in size and about 50 diagonals.

I found an interesting combo of layers that I really like. It

starts

with about 20nm of Chromium, followed by 130nm of Aluminum and
finished with 4 layers of Tantalum Pentoxide(Ta2O50) and SiO2 for
enhancement and protection. I get about 94% reflectivity with this
combo. I find that very few people use Ta2O5.

I found that the thin Chromium layer all, but eliminates pinholing.
The Ta2O5 is an extremely adherent material and combines very well
with SiO2. I have silver mirrors that I coated the same way. I have
one mirror in my MN56 that is over 3 years old and is still like
brand new. The reflectivity of that mirror is about 97%.


Al M


Yahoo! Groups Sponsor ADVERTISEMENT

<

705063107:HM/A=1513703/R=0/*

0

0_06F/g22lp?Target=mm/g22lp.tmpl>
To unsubscribe from this group, send an email to:
VacuumX-unsubscribe@...



Your use of Yahoo! Groups is subject to the
<>Yahoo! Terms of Service.

____________________________________
Donald M. Mattox
Technical Director
Society of Vacuum Coaters
71 Pinon Hill Place NE
Albuquerque, NM 87122-1914

Telephone 505/856-7188
FAX 505/856-6716
E-mail donmattox@s...
WebSite

Hello,

This email message is a notification to let you know that
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Hello,

This email message is a notification to let you know that
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Regards,

sloanpk2000 <amisiuk@...>

Hi,
This is one of the 3 systems used by Sirius Optics. Its actually my
least favorite.

Tp the left is the chiller. We maintain all components at 20C while
in operation. The chamber is 20" diameter. To the far right is the
14KV power supply with the control panel on top. We vent the system
with nitrogen seen against the wall.

This unit employs a roughing pump, and a cryopump and liquid nitrogen
boost.


Al M

Hi,
This image shows the open chamber. We have several planetaries. The
one visible is used for smaller interference filters and AR coats.

We line the chamber with aluminum foil for easier cleaning.


Al M

Looking for a glass bell jar that is at least 7.5" in inside
diameter and 21" in inside height. If anyone has any to sell or
point me to a cheap source, please let me know. Thanks.

--- In VacuumX@..., "cghlcon" <cghlcon@d...> wrote:

Looking for a glass bell jar that is at least 7.5" in inside
diameter and 21" in inside height. If anyone has any to sell or
point me to a cheap source, please let me know. Thanks.

Don't know what you are going to use to evacuate the chamber or do
with it once vacuumed but have you considered a plastic/acrylic tube
with an end plate of aluminum or brass instead? You might be able to
find a Pyrex or glass tube about that size but I don't know if they
make a Bell Jar to those dimensions.

Ken Hunter

Thanks, Ken. I'm actually not going to use it to create a vacuum
but rather to house and protect a painting painted on a bottle. I
was referred to this group by an Ebay seller.

Carlos Lazaro

--- In VacuumX@..., "Ken Hunter" <atm_ken_hunter@y...>
wrote:

--- In VacuumX@..., "cghlcon" <cghlcon@d...> wrote:

Looking for a glass bell jar that is at least 7.5" in inside
diameter and 21" in inside height. If anyone has any to sell or
point me to a cheap source, please let me know. Thanks.

Don't know what you are going to use to evacuate the chamber or do
with it once vacuumed but have you considered a plastic/acrylic

tube

with an end plate of aluminum or brass instead? You might be able

to

find a Pyrex or glass tube about that size but I don't know if

they

make a Bell Jar to those dimensions.

Ken Hunter

Yeah...

I frequent the eBay search [ "bell jar" -plath ] quite often. There's
always some of those glass cloche jars and short display jars but
I've never seen one that long (tall). For your use, I'd suggest that
you look in the "plastics" section of your local telephone book and
find an acrylic or plastic tube and have someone turn a top and
bottom plug out of some nice Burl wood, that would look pretty good.
If you were local to me, I'd do the plugs for you after I finish the
move to Amarillo over the next weeks. If you can't find a bell jar
and decide to do the tube/plug route and can't find someone locally
to do the plugs in the next month or so, get back with me and I'll
see what we can do to get you fixed up.

Ken Hunter

--- In VacuumX@..., "cghlcon" <cghlcon@d...> wrote:

Thanks, Ken. I'm actually not going to use it to create a vacuum
but rather to house and protect a painting painted on a bottle. I
was referred to this group by an Ebay seller.

Carlos Lazaro

--- In VacuumX@..., "Ken Hunter" <atm_ken_hunter@y...>
wrote:

--- In VacuumX@..., "cghlcon" <cghlcon@d...> wrote:

Looking for a glass bell jar that is at least 7.5" in inside
diameter and 21" in inside height. If anyone has any to sell

or

point me to a cheap source, please let me know. Thanks.

Don't know what you are going to use to evacuate the chamber or

do

with it once vacuumed but have you considered a plastic/acrylic

tube

with an end plate of aluminum or brass instead? You might be able

to

find a Pyrex or glass tube about that size but I don't know if

they

make a Bell Jar to those dimensions.

Ken Hunter

I have a used, surplus, Gast vacuum pump, never used in 25 years,
which I recently fired up to provide air to a "sparger" in a PCB
etchant tank.

I had to clean up the motor a bit so it would turn. At first it did
not output any air to speak of, then, it seemed to kick in after 5 or
10 minutes of running. It has been working ok for about 10 hours of
continuous use, but I would like more air from it.

The motor label states it has carbon vanes. I assume the old vanes are
worn and the cause of the low air output. Does anyone know of a source
for replacement vanes at a cheap price for a pump this old? Or another
fix?

Thanks,

Grant

On Sun, 2003-04-20 at 22:46, grantfair2001 wrote:

I have a used, surplus, Gast vacuum pump, never used in 25 years,
which I recently fired up to provide air to a "sparger" in a PCB
etchant tank.

I had to clean up the motor a bit so it would turn. At first it did
not output any air to speak of, then, it seemed to kick in after 5 or
10 minutes of running. It has been working ok for about 10 hours of
continuous use, but I would like more air from it.

The motor label states it has carbon vanes. I assume the old vanes are
worn and the cause of the low air output. Does anyone know of a source
for replacement vanes at a cheap price for a pump this old? Or another
fix?

Thanks,

Grant

Greetings

By virtue of your membership in a 'tinkering' kind of group I would
suggest that you open up said pump obtain carbon of a close size and
make the new blades.

Carbon is machinable just use very sharp tools and light cuts!

Darald

Hi Darald-

Machine carbon? To a high precision fit?

As Peanuts said to Lucy, you have very high ambitious - for me <g>. I
am sure it would be beyond my skills. I am reluctant to simply take
the pump apart for fear of damaging it. It does work now, although not
as well as I would like. Where are you in Canada? I'm in Toronto; if I
can find the carbon maybe you could demonstrate in your shop?

Has anyone on the list taken one of these pumps apart and know what
steps are involved?

Grant

On Mon, 2003-04-21 at 11:56, grantfair2001 wrote:

Hi Darald-

Machine carbon? To a high precision fit?

As Peanuts said to Lucy, you have very high ambitious - for me <g>. I
am sure it would be beyond my skills. I am reluctant to simply take
the pump apart for fear of damaging it. It does work now, although not
as well as I would like. Where are you in Canada? I'm in Toronto; if I
can find the carbon maybe you could demonstrate in your shop?

Has anyone on the list taken one of these pumps apart and know what
steps are involved?

Grant

Greetings

If I had a shop or worked in one where I had access to equipment for
after hours work I would say no problemo!!

I worked in a shop where we made carbon bushings for pump shaft
whatevers. These were done in a size from 1" OD and 3/4" ID to 3.5" OD
and can't remember the ID on that one.

We used HSS tools with a nice sharp edge with a generous radius on the
tool tip (but not too large either just more than for steel more like
that for 660 brass) and kept the cuts light. No pushing things to make
them go fast. Also used a small (3/4") paintbrush on the tool to control
the dust as this makes a mess on the machine. Clean the machine often
and clean very very well after!!

If you do not try you will never learn. Just use very sharp drill bits
and keep the pressure down and the rpms at a good rate but not real
fast. If you can machine to bearing fits and put in an O-ring groove
inside a piece 1" in that is 0.100 wide and 0.100 deep (each side) you
DO know enough to tackle it. Just do not get in a hurry and make sure
you actually have carbon and not graphite that is in the pump!

Darald

Try Duniway Stockroom ( www.duniway.com/ ) for the vanes or re-build
kit. My books are already packed up so I can't look it up for you.

Ken Hunter

My project is the gradual restoration of an old, (~1960 I'm
guessing)
Kinney vacuum coater, (Type SC-3).
The system is based on a 2" diffusion pump, 12" dia X 12" tall bell
jar, and a Sargent-Welch 1403 roughing pump.

To date, my progress has been to disassemble and clean up the
diffusion pump. It had the appearance and smell on the inside of
being a crude oil cracking apparatus. I used oven cleaner, (not
wanting to mess with hot lye solutions) followed by distilled water
and then acetone to clean it up. I replaced all the seals with new
Viton O rings. I cleaned up and changed the oil in the roughing pump
which seems to be in very good condition.

At this point I decided to see were I stood with the system. Without
further disassembly and cleaning, (I was worried about the condition
of the rubber diaphragms in the various diaphragm valves, the outside
edges look cracked, but I didn't want to mess with them unless I
had
to), I started roughing down the system.

I think it went surprisingly well for such and old piece of
equipment. I was able to get the system down to about 10^-2 torr,
which surprised me because as far as I can tell the 1403 roughing
pump is a one stage pump and I wouldn't expect it to get much
below 1
torr. The pressure was monitored using a Stokes McLeod gauge. One of
the three installed thermocouple gauges seemed to be functioning. I
suspect that the other two gauge tubes, (Type 531) are not working.
The discharge gauge, which I'm assuming was installed in the bell
jar
base plate, because there was a vacant hole, is missing. My guess it
was a cold cathode ion gauge. I have a Kinney type KDG gauge head a
Varian 524-2 gauge head and a NRC type 507 ionization gauge sitting
in a box of parts I got with the system, along with a CVC Autovac
3294A gauge controller and a NRC 724 Gauge controller. Which gauge
head goes with which controller I am not at all certain. I also
picked up a Bendix (CVC?) GP-310 Pirani gauge controller with no
sensor head at the MIT flea marker Sunday just because it was sitting
there for $10.

The immediate questions I have concern the next step. I feel that I
am in the pressure realm that I can consider turning on the diffusion
pump. Initiayl I charged the diffusion pump with an unknown silicon
oil that I removed from an old 4" CVC system that I have waiting for
possible restoration. Then I got to thinking that this old Kinney
system was probably designed for a hydrocarbon diffusion oil and the
heater came into question. The heater is a Chromalox HSP 31, 115V,
100W disc heater. There is no controller or thermostat on the heater
nor anyway to measure the heater temperature. What diffusion pump oil
should I use? I might add that there seems to be no baffle between
the diffusion pump and the bell jar, just a gate valve.
Intrumentation. What sensor head goes with what controller? A cheap
source of type 531 T/C gauge heads. The same for a Pirani type GP-003
sensor tube. Does anyone have any recollection of this Kinney system?
This is a "back burner" type of project, going slow as I collect
information and pieces.

My interest in vacuum coating has to do with small acoustical sensors
and sources. For example, I am currently working on a miniature
electrostatic sound source which incorporates a slightly conductive
very thin, (~.00006 inch) Mylar diaphragm and perforated thin metal
stators. Currently I am making the diaphragms "conductive", (about
10K ohms over 1") by applying powdered graphite to them. They work,
but this doesn't seem very elegant or controllable. If I get the
vacuum coating system running, my next series of questions may be
concerning how to conductively coat mylar without melting it,
(radiating heat). The Kinney system is also set up with carbon
coating capabilities. Also, because these electrostatic sources I am
working on are to be used in a very high magnetic field, (MRI) I have
a need to minimize metal in their construction, (eddy currents), so a
metalized stator might have advantages. Envisioned future uses for
vacuum coating might concern capacitance micro phones, again
metalized diaphragms and stators, and plasma clean/etching sounds
interesting because I am forever trying to adhesively bond polar
polymers, (nylon, Delrin, polyethelene, Teflon, etc)

Thanks for any guidance

ExpTec
DBA Experimental Technique

Hi Darald - thanks for the reply, it is helpful.

For reasons unknown, the Gast pump started putting out lots of air
recently. It has been running non-stop for several days so maybe
something wore into shape, though the thing was old surplus when I
bought it. Anyway - for now it is working just fine!

Grant

Thanks Ken -

They did not have any Gast kits, are the names they use "generic"?

And if those are cheap prices, what are the expensive ones like? <g>

Anyway, my pump inexplicably started pumping more air recently, so for
now I don't need to improve it.

Good luck with your upcoming move.

If I have trouble with the pump in the future I will be back to the list.

Grant

On Tue, 2003-04-22 at 21:16, grantfair2001 wrote:

Hi Darald - thanks for the reply, it is helpful.

For reasons unknown, the Gast pump started putting out lots of air
recently. It has been running non-stop for several days so maybe
something wore into shape, though the thing was old surplus when I
bought it. Anyway - for now it is working just fine!

Grant

Greetings

I am currently working on a vacuum truck and every 8 to 10 running hours
I flush the pump with a 3:1 mixture of diesel and ATF oil. The ratio
could be different in your application because I have problems with
internal grease deposition that you should not have. Check with a Gast
vacuum pump distributor as to recommended practice. This process may not
apply to a high accuracy pump but is used regularly on vacuum trucks in
this area.

The flushing is to lubricate (and clean) the inside of the pump.

Darald