IPC-TM-650 EN 2022 试验方法.pdf - 第291页
5.11 At least three test specimens, per lot, are tested at each test temperature. 5.12 To avoid creep and/or thermal effects, keep the total test cycle time (Steps 5.7 through 5.9) under 2 minutes. 6.0 Evaluation 6.1 The…
1.0
Scope
This
method determines the hot rupture
strength of foil by measuring the elevated temperature rupture
pressure and the bulge height at rupture.
2.0
Applicable Documents
IPC-MF-150
3.0 Apparatus
3.1
EMK
Model HD550 Hot Rupture Testing Machine, or
equivalent, with fixed apertures for 17 micron [1/2 oz.], 34
micron [1 oz.] and 68 micron [2 oz.] foil.
3.2
Mettler
balance, Type H16 Cap 80 gms, or equivalent;
and hand shears or precision paper cutter.
4.0
Test Specimen Generation
4.1
Nine
(9) test specimens, up to 114 x 114 mm [4.5 x 4.5
inches] in size, are required for each sample lot. Larger
sample panels can be cut into specimen squares by the use
of a template and hand shears.
4.2 Foil
samples should be representative of foil material lots
as defined in IPC-MF-150.
4.3
For
the rupture testing of in-house PTH copper, electro-
plate a sample onto a smooth stainless steel panel per exist-
ing PWB shop practice. The current density used for sample
preparation should be equivalent to that used in PTH produc-
tion schedules. The deposited thickness should be held within
±5% of 0.018 mm [1/2 oz], 0.035 mm [1 oz.], or 0.071 mm [2
oz.] foil.
4.4
Thermal
strain relief prior to rupture testing is limited to
times and temperatures at or below the highest heating cycles
used in PWB production.
5.0 Test Procedure
5.1
For
Inner-layer foil specimens, record the date, source,
lot identification, nominal foil thickness, foil type, foil grade,
and the aperture diameter.
5.2
For
PTH foil specimens, record the date, source, PTH
bath type, the measured thickness and the aperture diameter.
5.3
Aperture Plates
Select
and install the desired aperture
plate for 0.018 mm [1/2 oz.], 0.035 mm [1 oz.] or 0.071 mm
[2 oz.] test specimen.
5.3.1
Aperture
diameters are fixed at 22.2 + 3.2 mm [0.875
+ 0.125″ r] for 1/2 oz. foil; 22.2 + 3.2 mm [1.875″ + 0.125″ r]
for 1 oz. foil; and 73 + 3.2 mm [2.875″ + 0.125″ r] for 2 oz.
foil.
5.4
Flow Control
Rate
of flow is fixed for the stress rupture
test. The flow rate is fixed by setting the source pressure at
100 psig, sealing the system and adjusting the flow to reach
50 psig in 5 seconds.
5.5
Test Temperature
Set
the test equipment for tests, in
turn, at room temperature, 350°F [177°C] and 550°F [288°C].
Temperature stabilization for hot tests requires a minimum of
15 minutes at temperature (without foil specimens) before the
first test is run.
5.6
Pressure
Set
the test pressure regulator at the source
pressure limit. Re-set the pressure gauge to zero and set the
Peak and Hold modes.
5.7
Specimen Insertion
Place
treated foil specimens in
the test fixture with the treated side up, others with either side
up. Clamp in place with sufficient force to provide a pressure-
tight seal.
5.8
Height
Position
the height gauge at the center of the
aperture. Re-set the height gauge to zero and set the Peak
and Hold modes.
5.9
Turn
on the test pressure. After rupture occurs, turn the
pressure off, and remove the test specimen.
5.10
Record
the test temperature, the pressure at rupture,
and the bulge height at rupture. With digital gauges, take Peak
readings within 10 seconds of rupture (because of an inherent
decay in the peak signal).
The
Institute for Interconnecting and Packaging Electronic Circuits
2215 Sanders Road • Northbrook, IL 60062-6135
IPC-TM-650
TEST
METHODS MANUAL
Number
2.4.18.2
Subject
Hot
Rupture Strength, Foil
Date
7/89
Revision
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.
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5.11
At
least three test specimens, per lot, are tested at
each test temperature.
5.12
To avoid creep and/or thermal effects, keep the total
test cycle time (Steps 5.7 through 5.9) under 2 minutes.
6.0 Evaluation
6.1
The
stress rupture test is quantitative for rupture pres-
sure and for bulge height at each test temperature.
6.2
Report
the rupture pressure and the bulge height at rup-
ture for each test specimen at each test temperature.
6.3
Discard
test specimens with obvious defects and/or evi-
dence of plating artifacts (before or after the rupture test).
IPC-TM-650
Number
2.4.18.2
Subject
Hot
Rupture Strength, Foil
Date
7/89
Revision
P
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1.0
Scope
This
test method establishes a procedure for
determining the tensile strength, elongation and Young’s
modulus of organic free films.
2.0
Applicable Documents
ASTM D 618
Standard
Practice for Conditioning Plastics and
Electrical Insulating Materials for Testing
ASTM
D 882
Standard
Test Methods for Tensile Properties
of Thin Plastic Sheeting
ASTM
D 1005
Standard
Test Methods for Measurement of
Dry-Film Thickness of Organic Coatings Using Micrometers
ASTM
D 2370
Standard
Test Method for Tensile Properties
of Organic Coatings
3.0
Test Specimen
The
test specimen shall consist of a
strip 12.70 mm wide by 76.20 mm in length and at least 10
µm in thickness. The width of the specimen should not devi-
ate by more than 2% over the length of the specimen
between the grips. The thickness of the films shall not vary by
more than 10% over the entire film. A minimum of ten speci-
mens are required.
4.0
Apparatus or Material
4.1 Thickness Measurement Device
Mitutoyo
519-605
Mini-Checker with a 519-891 probe with vacuum assist con-
nected to a MUX-10 multiplexer or equivalent thickness mea-
surement device accurate and precise to 0.1 µm.
4.2
Width Measurement Device
Micrometer
or equivalent
width measurement device capable of measuring to 0.25 mm.
4.3
Specimen Cutter
Thwing-Albert
JDC Precision Cutter
or equivalent. The specimen cutting device must be capable
of cutting a film strip 12.70 ± 0.25 mm wide over the length of
the specimen. It is imperative that the cutting edges be kept
sharp and free from visible scratches or nicks. The use of
striking dies is not recommended because of poor and incon-
sistent specimen edges.
4.4
Tensile Tester
Instron
Model 4501 Tensile Tester with
a 0.2 kN load cell or equivalent. The testing machine must be
equipped with a load cell whose compliance is a maximum of
2% of the specimen extension within the range being mea-
sured. Digital (as opposed to analog) self-calibrating load cells
are preferred since they eliminate the need for and potential
error associated with calibrating analog load cells using exter-
nal weights. The testing machine must be equipped with a
device for recording the tensile load and the amount of sepa-
ration of the grips; both of these measuring systems should
be accurate to ± 2%. The rate of separation of the grips shall
be accurate to ± 0.1% and capable of adjustment from
approximately 0 to 50 mm/min.
4.5
Gripping Devices
A
gripping system that minimizes
both slippage and uneven stress distribution must be used.
The grips must be self-aligning, i.e. they must be attached in
such a manner that they will move freely into alignment as
soon as any load is applied so that the long axis of the speci-
men will coincide with the direction of the applied pull through
the center line of the grip assembly.
4.6
Grip Faces
Specimen
slippage and necking of the
specimen up into the grips are two of the most common
problems with this test method. Slippage can be checked by
drawing a series of parallel lines across the part of the speci-
men in the grips. After pulling the specimen, if the lines are not
parallel, the specimen may be slipping on one side. On speci-
mens with high elongations, necking of the specimen into the
grips is a problem. As the specimen elongates, the reduction
of area (necking) results in a loosening of the specimen at the
inside edges of the grips. This loosening propagates further
back into the grips with continued elongation of the specimen.
This can lead to erroneous results for the elongation. Air-
actuated grips lined with rubber faces (e.g., neoprene) that
have been machined flat were found to be effective against
both of these problems and still allowed the specimen to be
easily removed from the grips after the test. Another approach
is to use line grips, i.e. grips having faces designed to concen-
trate the entire gripping force along a single line the width of
the specimen perpendicular to the direction of the testing
stress. This is usually done by combining one standard flat
grip face and an opposing grip face that has been cut down.
In cases where specimens frequently fail at the edge of the
grips, it may be advantageous to round the edges of the grip
faces where they meet the test area of the specimen.
The
Institute for Interconnecting and Packaging Electronic Circuits
2215 Sanders Road • Northbrook, IL 60062-6135
IPC-TM-650
TEST
METHODS MANUAL
Number
2.4.18.3
Subject
Tensile
Strength, Elongation, and Modulus
Date
7/95
Revision
Originating Task Group
Deposited Dielectric Task Group (C-13a)
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
age1of3
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