Hi Chris - a SEM analysis, with the correct standards and detector setup,
can see 0.2% Co but you would be better off using a Auger or SIMS analysis
for looking at a trace element in thin surface finish.
Dave Hillman
Rockwell Collins
[log in to unmask]
Chris Mahanna <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
12/01/2009 09:22 AM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
Chris Mahanna <[log in to unmask]>
To
[log in to unmask]
cc
Subject
Re: [TN] IAu hardness
O.K. We gave-up on the nano-identation altogether.
So, w.r.t. contact areas, if we found no Cobalt by SEM-EDS, what are the
chances of hard gold?
Is 0.2% Co not detectable? Or is it maybe just AuNi? We did get Ni.
Chris
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Chris Mahanna
Sent: Tuesday, November 03, 2009 9:55 AM
To: [log in to unmask]
Subject: Re: [TN] IAu hardness
Inge et al.
Yes, I know the whole project seems a little strange. So here is a little
more background: It is not uncommon for us to be asked to
characterize/verify ENIG and hard gold on the same board (for the obvious
reasons). There must be 7 different ways to do that.
But, if I need to verify 500nm of AuCo over Ni to be 170 Knoop, I figure
we need nano indent. At the same minimum job charge, I can get some
numbers from the IAu. If they are softer, voila!, I've
verified/quantified that two processes were used.
Unfortunately, I'm not sure that I even got good numbers for the 500nm of
AuCo.
Can you help with your conversion below? 5g-force/cm^2 = 0.0005 MPa? =>
approx. 0.00005 HV ???
Chris
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Hernefjord Ingemar
Sent: Tuesday, November 03, 2009 3:40 AM
To: [log in to unmask]
Subject: Re: [TN] IAu hardness
The micro/nano hardness is dependent of the nucleus growth > morphology.
As far as I remember, there are three main types of grains: flakes,
smoothy and powdered. These give various hardness. The size of the grains
and the crystal directions also give variations in the hardness, as well
as the thickness. Small bath contaminations, like AuCN can add further
hardness. It's interesting to see that someone asks for the hardness of
IG, because we have never succeeded to measure such thin gold platings. If
you measure thicker gold, you are not so dependent of what I said above.
So, for thicker films we use the following data:
5 grams= 215 HV
10grams= 220 HV
20grams= 200 HV
40grams= 220 HV
60grams= 223 HV
80grams= 225 HV
100gram= 225 HV
Inge
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Anil kher
Sent: tisdag 3 november 2009 07:33
To: [log in to unmask]
Subject: Re: [TN] IAu hardness
By pure chemistry of deposit - IAu should be 60 to 70 knoop microhardness
However since deposit is 0.05 um you would measure the underneath NiP
hardness which is in 950Hv range.
Electrolytic Gold / Cobalt 0.2% should be 170 knoop. Electrolytic Nickel
pure below Gold is 300 Hv.
Anil Kher
-----Original Message-----
From: Vladimir Igoshev [mailto:[log in to unmask]]
Sent: Tuesday, November 03, 2009 09:03
Subject: Re: IAu hardness
Chris,
In that particular case the surface roughness does matter a lot. Ideally,
an indenter should come at 90 degree to the surface and it wouldn't be the
case particularly for ENIG with its "nodding structure".
In addition, as I said before you can not compare the numbers as (in case
of
ENIG) the reading most probably will be affected by residual stresses.
I'm not aware of a "typical" number for ENIG. A number of years ago I
tried to measure it at different loads but don't remember what the
readings were.
Honestly, I wouldn't use nanohardness (great technique but for different
tasks) in your particular case.
Regards,
Vladimir
SENTEC
SENTEC
11 Canadian Road, Unit 7.
Scarborough, ON M1R 5G1
Tel: (416) 899-1882
Fax: (905) 882-8812
www.sentec.ca
-----Original Message-----
From: Chris Mahanna <[log in to unmask]>
Date: Mon, 2 Nov 2009 22:12:04
To: <[log in to unmask]>
Subject: Re: [TN] IAu hardness
Vladimir,
Indeed nano. Both platings were tested with the exact same protocol:
Berkovich geometry, 1mN max load. They are reporting penetration depth in
nM. The lab complained about the surface being too rough. Might the IAu
be un-uniform and the indenter is getting ahold of some Ni? XRF with 4mil
collimator doesn't show anything odd. Saw some mudcracks via SEM on a
"related" sample.
Or, should we just punt and say that comparisons can't be made? If so,
does anyone know what numbers you typically get from ENIG?
Chris
-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Monday, November 02, 2009 9:34 PM
To: TechNet E-Mail Forum; Chris Mahanna
Subject: Re: [TN] IAu hardness
Hi Chris,
Are you sure you are talking about nanohardness and not microhardness?
If it's nanohardness, then the measured values are completely different
from a common (microhardness) method due to the nature of nanohardness
measurements.
Secondly (and even more important) on a plated sample (and particularly
like ENIG with extremely thin layer of Au) the nanohardness readings will
depend on the indentation load (read depth of penetration).
In general, you can not draw a direct comparison between nanohardness
measurements done on a thick (your hard gold case) and extremely thin
(ENIG
case) plating.
Regards,
Vladimir
------Original Message------
From: Chris Mahanna
Sender: TechNet
To: [log in to unmask]
ReplyTo: TechNet E-Mail Forum
ReplyTo: Chris Mahanna
Sent: Nov 2, 2009 21:17
Subject: [TN] IAu hardness
Please help a simple EE.
From bare printed boards we are receiving nano-identation (hardness)
values for hard (I assume Cobalt) gold in the 3000 MPa range. Quick and
dirty conversion yields ~300 Knoop/Vickers; right?
That sounds reasonable.
BUT, we're getting 6500 MPA for the ENIG. Is this even possible? Does
anyone know if it is an indication of poor IAu? Or maybe a poor
nano-indentation tester?
Thanks,
Chris
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