IPC-TM-650 EN 2022 试验方法.pdf - 第228页
1 Scope Ductility values are determined by measuring the bulge height on a Mullen bulge tester or equivalent. Measure- ments are made in mm. 2 Applicable Documents None 3 Test Specimen Three clean, smooth pieces of coppe…
5.3.3
Within
90 seconds of applying the tape, remove the
tape with a steady motion by pulling at a 180° angle.
5.3.4
Inspect the lattice pattern under illumination for
removal of coating from the substrate. Rate the adhesion in
accordance with the following scale illustrated in Figure 2:
•5 The edges of the line patterns are completely smooth;
none of the squares of the lattice are detached.
•4 Small flakes of the coating are detached at the intersection
of the lattice; less than 5% of the area is affected.
•3 Small flakes of the coating are detached along the edges
and at intersections of the lattice. The area affected is 5 to
15% of the lattice.
•2 The coating has flaked along the edges and on parts of
the squares. The area affected is 15 to 35% of the lattice.
•1 The coating has flaked along the edges of the line patterns
in long ribbons and whole squares have detached. The
area affected is 35 to 65% of the lattice.
•0 Greater than 65% of the lattice has detached.
5.3.5
Place
the test specimens in a boiling water bath and
stress the samples for 3 hours. The water in the boiling water
bath must completely cover the test specimens for the entire
3 hours. A closed system that returns the steam as conden-
sation is preferred.
5.3.6
Remove
the test specimens from the boiling water
bath or environmental chamber and allow to cool to room
temperature.
5.3.7
Wipe
sample dry. Repeat steps 5.3.1-5.3.4 on the
second (unused) grid pattern.
5.3.8
Report
adhesion results for both the initial and 3 hour
tests.
6.0 Notes
None
2.4.1.6-02
Figure
2
Classification
5
None
4
3
2
1
0 Greater than 65%
Surface of cross-cut area from
which flaking has occurred.
(Example for six paralleled cuts)
IPC-TM-650
Number
2.4.1.6
Subject
Adhesion,
Polymer Coating
Date
7/95
Revision
P
age2of2
电子技术应用 ｗｗｗ．ＣｈｉｎａＡＥＴ．ｃｏｍ
1
Scope
Ductility
values are determined by measuring the
bulge height on a Mullen bulge tester or equivalent. Measure-
ments are made in mm.
2
Applicable Documents
None
3
Test Specimen
Three
clean, smooth pieces of copper
foil 10 cm x 10 cm area or any non-overlapping equivalent
areas.
4
Apparatus
Mullens
Bulge Tester by B. F. Perkins & Son,
Inc., Model A to be 10 RPM at large shaft between gear box
and diaphragm, or equivalent.
5
Procedure
5.1 Preparation
Raise
upper clamping ring by rotating the
hand wheel. Place a 10 cm x 10 cm by 0.15 mm thick steel
plate that is perfectly flat over the diaphragm and lower the
upper clamping ring applying sufficient pressure to prevent
slippage. Zero the dial indicator. Raise the upper clamping
ring and remove the 10 cm x 10 cm by 0.15 mm steel plate.
NOTE:
The
above operation should be done once every
eight-hour shift.
Start the motor and move the ball-handled control lever to the
right to be certain that the diaphragm is returned to its start-
ing position.
5.2
Test
5.2.1
Place a sample of the copper foil to be tested over the
diaphragm with the matte side up.
5.2.2
Lower
the clamping ring, applying sufficient pressure
to prevent slippage of the sample between the plates.
5.2.3 Move
the ball-handled control lever to the left. The
operator should keep his hand on the lever in readiness to
stop or reverse the machine at any time during the test and
when the test is complete. During the test, the operator
should be watching the dial indicator and, at the instant burst-
ing occurs, should note the reading on the dial indicator and
the ball-handled control lever should be moved as far to the
right as it will go and be released. This will return the dia-
phragm to its starting position and automatically shut off the
pump.
5.3
Evaluation
5.3.1
Record
the reading from the dial indicator.
5.3.2
Rotate
the hand wheel to raise the clamping ring and
remove the sample. Avoid overlapping of the clamping areas
and disregard any single reading that is not reasonably con-
sistent with those taken in neighboring areas, and repeat the
test.
The
Institute for Interconnecting and Packaging Electronic Circuits
2215 Sanders Road • Northbrook, IL 60062-6135
IPC-TM-650
TEST
METHODS MANUAL
Number
2.4.2
Subject
Ductility
of Copper Foil
Date
3/76
Revision
A
Originating Task Group
N/A
Material
in this Test Methods Manual was voluntarily established by Technical Committees of the IPC. This material is advisory only
and its use or adaptation is entirely voluntary. IPC disclaims all liability of any kind as to the use, application, or adaptation of this
material. Users are also wholly responsible for protecting themselves against all claims or liabilities for patent infringement.
Equipment referenced is for the convenience of the user and does not imply endorsement by the IPC.
P
age1of1
电子技术应用 ｗｗｗ．ＣｈｉｎａＡＥＴ．ｃｏｍ
Note:
For
flexural fatigue tests lasting in excess of 1000
cycles, the adhesive tape attachment needs to be substantial
enough to prevent relative sliding of specimen and sample
holder as a result of the cyclic flexure movements.
5.2
Test Procedure
5.2.1
Mount
mandrels to flex tester, adjust the support
roller positions for a clearance of 1.27 mm [0.05 inch] (shim
provided) between rollers and mandrels.
Note:
For
the ductility test, it is important that the specimens
fail between 30 and 500 cycles. Mandrels with 2.0 or 1.0 mm
[0.079 or 0.040 inch] diameter are suggested but for some
samples, mandrel diameters different from these diameters
might be necessary. Larger mandrel diameters result in longer
cyclic life and smaller diameters in shorter life.
5.2.2
Mount
test specimen between mandrels, attach relay
leads with alligator clips to foil weight wing nut to form ‘‘slip-
off’’ electrical connections, plug relay leads into relay jacks,
set counter to zero, and start flex tester.
5.2.3 Complete
separation of the foil specimen constitutes
failure and the flex tester stops automatically when the drop-
ping foil weight dislodges the alligator clips from the wing nut.
5.2.4
Record
cycles-to-failure indicated on counter.
5.3
Evaluation
5.3.1 Ductility Test
5.3.1.1
Calculate
the ductility for each specimen by itera-
tively solving the formula below:
N
f
−0.6
D
f
0.75
+ 0.9
S
u
E
[
exp(D
f
)
0.36
]
(0.1785
log
10
5
N
f
)
−
2t
M
21+t
= 0
where:
D
f
=
fatigue ductility, inch/inch (x100,%)
N
f
=
cycles-to-failure
S
u
=
ultimate tensile strength, psi
E = modulus of elasticity, psi
t
M
=
core thickness, inch
t = specimen micrometer thickness, inch
1 = mandrel radius of curvature, inch within 0.005 mm
[0.0002 inch]
Note:
Determine
S
U
as
per Test Method 2.4.18 of IPC-TM-
650. Determine E during the test for S
U
by
unloading and
reloading after about 2% elongation and measuring the slope
of the reloading curve.
Note:
The
determination of E foils is not a straightforward
procedure. It is therefore suggested that for specification pur-
poses standard values of E be adopted. For copper foil such
standard values might be: E(CF−E)=12x10
6
psi
for electro-
deposited foil, E(CF−W)=16x10
6
psi
for wrought (rolled) foil.
Note:
The
calculator program described in paragraph 6.2
solves the ductility formula and conveniently prompts for all
necessary input parameters.
5.3.1.2
Report
the average ductility from at least three
specimens.
5.3.2
Fatigue Test
The
number of cycles to failure, is the
flexural fatigue life in fully reversed bending for the bend radius
corresponding to the radius (1/2 diameter) of the test man-
drels used. An average flexural life from at least three speci-
mens should be reported.
5.3.3
Fatigue Behavior
The
fatigue behavior of a sample
can be obtained by determining the flexural fatigue life with a
number of different-diameter mandrels. Plotting the results in
a strain range versus fatigue life Manon-Coffin plot log ∆ε =
[2t
M
/(21 +
t)] versus log N
f
)
allows intra- and extrapolation to
other bend radii or fatigue lives.
IPC-2421-2
Figure
2 Fatigue ductility flex tester
IPC-TM-650
Number
2.4.2.1
Subject
Flexural
Fatigue and Ductility, Foil
Date
3/91
Revision
D
P
age2of3
电子技术应用 ｗｗｗ．ＣｈｉｎａＡＥＴ．ｃｏｍ