IPC-TM-650 EN 2022 试验方法.pdf - 第290页
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 HD…
5.3.5.1
Activate
cross head to break sample and make cal-
culations of tensile strength in Mpa and elongation in %.
5.3.5.2
Percent elongation may be determined by fitting the
ends of the fractured specimen together carefully and mea-
suring the distance between the original gage marks to the
nearest 0.25 mm [0.00984 in]. Elongation is the increase in
length of the gage length, expressed as a percentage of the
original gage length.
Percent elongation =
length at break – original gage length x 100
original
gage length
5.3.5.3
Average
all five elongation readings. See IPC-TM-
650, Method 1.7, for information about discarding invalid
results.
6
Notes
6.1
The
JDC-50 sample cutter has been found suitable for
cutting specimens to the appropriate dimensions. This cutter
is manufactured by Thwing-Albert Instrument Co., 10960 Dut-
ton Road, Philadelphia, PA 19154. (215-637-0100)
IPC-TM-650
Number
2.4.18.1
Subject
Tensile
Strength and Elongation, In-House Plating
Date
05/04
Revision
A
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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
age2of2
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