" MLM-MU--90-6 9-0003 DE91 001320 Kapton HN Investigations M. K. Williams, A. E. Smith (SNLA), M. A. Huelskamp, K. P. Armstrong, J. L. Brandon, and J. M. Lavoie Issued: September 28, 1990 MOUND operated by III _ EG_zG MOUND APPLIED TECHNOLOGIES ,qy" _@, P,O, Box 3000, Miamisburg, Ohio 45343-3000 I for the U, S, DEPARTMENTOFENERGY Contract No, DE-ACO4-88DP43495 _,_ f:,_, ,:7, _i. _i"ti""_ I L_ ,,I • O ]_ ' DISTRISIJTIfJN L%:,Lf-_J., Bf..[,.I.Ii_F.N.I ]8 JJ,Ni.l_r[._
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" MLM-MU--90-6 9-0003
DE91 001320
Kapton HN Investigations
M. K. Williams, A. E. Smith (SNLA), M. A. Huelskamp,K. P. Armstrong, J. L. Brandon, and J. M. Lavoie
Issued: September 28, 1990
MOUND
operated byIII
_ EG_zG MOUND APPLIED TECHNOLOGIES,qy" _@,
P,O, Box 3000, Miamisburg, Ohio 45343-3000I
for the
U, S, DEPARTMENTOF ENERGYContract No, DE-ACO4-88DP43495 _,_f:,_,,:7,_i. _i"ti""_ I
L_ ,,I• O ] _ 'DISTRISIJTIfJNL%:,Lf-_J.,Bf..[,.I.Ii_F.N.I]8 JJ,Ni.l_r[._
FiEure 8 - Exploded view of half a bridEe showin E" stud Elued to metal coat,and ceramic disk (aliEned with the stud above) Elued to the underside of the
substrate (polyimide film). The potential failure modes (ADH, AS, IS, and SW)are also shown.
Table 5 - PVD BUTT TENSILE TEST RESULTS
Rupture Strengthat Failure
(psi) First Failure t_ode
Material _ ± ts /7n 9 df AD___HH AS I__SS SW NF
Kapton H 5.43 ± 0.89 4 3 1 2 0
Kapton HN 5.77 ± 0.32 3 0 5 2 0
Upilex-S 8.67 ± 0.55 5 3 0 i i
Upilex-R 7.53 ± 0 86 lO 0 0 0 0
Upilex-SGA 8.76 ± 0.74 i0 0 0 0 0
0 Apical 5.75 ± 0.40 9 0 0 i 0
13
Peel tests were performed on all of the "'oly_imidefilms rudder study, The
results are tabulated in Table 6. Ali of the results were much lower than '
expected, Past peel tes-s with Kapton H and Kapton HN averaged around 7 ib/
linear in. Since all the samp].es yielded lower than expected results, this
work will be repeated.
Besides being used as an insulating medium, polyimide films (Kapton) are used
as flyer material in Mound's flexible cables. Flyer performance of Upilex-S
was compared to that of Kapton H by fabricating MAD-lO79 cables with Upilex-S
flyers. The data summarized in Figure 9 indicate that there is little i.fany
difference between the performance of a Kapton flyer and an Upilex-S flyer.
Testing of Fully Fabricated Components
Some of the cable manufacturing steps involve the use of an etching solution
that contains potassium hydroxide (KOH). Since this step, which has been
known to dissolve Kapton, causes some of the slip additive (CaHPO4) parti-
c].es to be released from the surface of the film, concern was expressed about
the electrical integrity of the film with pits in its surface. Consequently,
.=ireMC3926 cables were exposed.to a 1.0% solution of KOH at 150°F for 2 min.
This exposure represents a slightly more intrusive environment than what
would be experienced during the course of normal processing. Afterwards,
these cables, along with five untreated cables, were high-potential breakdown
tested to destruction. The results, which are tabulated irl Table 7, show
Table 6 PEEL STRENGTH TEST RESULTS a
Sample No. i 2 3 4 5 6 7 8
Apical Tb T 2.0 T T T 1 5 T
Upilex-.R i.i i.I 1.3 1.4 1.5 1.3 0 97 i.i
Upilex-SGA 3.5 3.7 2.9 4 ]. 3.6 3.2 3 0 3,1
Upilex-S 3.2 4,2 T 4,7 2.7 2.8 4 3 4,2
Kapton H T T T T T T 3 4 T
Kapton HN 3.6 2,9 3.3 2.6 2.7 3.0 2 6 2.7
aResults are expressed in lh/linear in. a
bT indicates the sample tore.
14
" 5 ...... i.........
i
'5 2 .........o
>
I , ,....... ,....
1300 1400 1500 1600 1800 2000 2200 2500
Upilex-S 2.4 2.85 3,1 3.3 3.75 3,95 4,35 4,65
Kapton H 2,55 2.75 3.05 3,35 3.6 3.75 4.6
Voltage (V)
Figure 9 - VISAR resulus show that there is little difference in performance
between Upilex-S and Kapton H flyers.
Table 7 HIGH POTENTIAL BREAKDOWN TEST RESULTS
VoltageSerial No. (kv)
Untreated 8006 36
8306 27
8326 36
8856 36
8992 38
Treated a 8637 388656 36
8689 32
8753 39
8904 39
' aFive MC3926 cables were treated with KOH at
150°F for 2 min, followed by a 50% HCI rinse
, at 78°F before being high potential tested todestruction.
15
that ali of the cables retained excellent insulating properties, The lowest
failure was at 27 kV and that was one of the untreated cables,
The finai concern is long-term aging, and an aging environment has been
selected. The cables will be stored at 52% relative hu_nidity (RH) and
ambient temperature for 24 hr and then 92% RH and 40°C for 24 hr. This cycle
will be repeated until the cable has been appropriately aged; then, the cable
will be visually inspected for such deleterious effects as delamination and
discoloration before being high-potential breakdown tested to destruction.
These results will then be compared to aged cables that have seen no special