IPC-TM-650 EN 2022 试验方法.pdf - 第288页
5.1.1.8 Inspect samples and discard those with nicks or pinholes in the gage length. Specimens should be smooth and undistorted without scratches from the plate in the gage length. 5.1.2 Cut Method 5.1.2.1 Clean the stai…
1
Scope
To
determine the tensile strength in Mpa (PSI) and
the elongation, in percentage, of electrodeposited copper
plating at ambient temperatures by mechanical force testing.
2
Applicable Documents
ASTM E-345
Standard
Test Methods of Tension Testing of
Metallic Foil
IPC-TM-650
IPC
Test Methods Manual
1.7 Reporting, Invalid Test Results
3
Test Specimen
3.1
Plated
copper samples prepared in sheet form for cut-
ting or etching into the appropriate pattern, or pattern plating
of the appropriate form.
3.2
Samples
may be in the form of strips of 13 mm x
152 mm [0.512 in x 5.98 in] or in the form of ‘‘dogbone’’
samples as described in ASTM E-345, Type A. The thickness
of the samples 0.05 mm to 0.1 mm [0.00197 in to
0.00394 in]. Testing shall be performed on ten samples (five
lengthwise and five crosswise). Specimens must be wrinkle
free, clean cut, and free of burrs and nicks.
4
Apparatus or Material
4.1
Constant
strain rate tensile tester capable of pulling at
rate of 0.05 mm/mm to 0.5 mm/mm [0.00197 in/in to
0.0197 in/in] per minute of the length of the reduced section
(or the distance between the grips for straight sided speci-
mens).
4.2
Sample preparation equipment
4.3
Sample
Size: 13 mm wide X 150 mm [0.512 in wide x
5.91 in long].
4.4
A
sample cutter capable of cutting samples to the
appropriate size {see 6.1).
4.5 A
phototool of tensile specimen of the appropriate size
(strip or dogbone).
4.6
Stainless
steel panel, type 304 or 321, 300 mm X
300 mm [11.8 in x 11.8 in] or of a size identical to that used
to produce plated product. The panel surface must be free of
pits, nicks, and scratches. Low carbon stainless steel per-
forms best.
4.7
Weighing
balance capable of resolving to 1 mg.
4.8
Precision
linear measuring device capable of measuring
to the nearest 0.025 mm [0.000984 in].
4.9 Precision
micrometer capable of measuring to the near-
est 0.0025 mm [0.0000984 in].
4.10 An
oven capable of maintaining 125 °C ± 5 °C [257 °F
± 9 °F].
5
Procedure
5.1 Samples Preparation
Samples
may be prepared
using the phototool Method 5.1.1 or the cut Method 5.1.2.
5.1.1
Phototool Method
5.1.1.1
Clean
the stainless steel panel using a standard acid
or alkali cleaner (preferably reverse current) and verify by per-
forming water-break test to insure cleanliness.
5.1.1.2
Apply
negative resist to stainless steel plate.
5.1.1.3 Image
plate with phototool and develop image using
any acceptable method.
5.1.1.4 Inspect
image for integrity.
5.1.1.5
Plate
the imaged panel with a current density
equivalent to production current density to a thickness of
0.05 mm to 0.1 mm [0.00197 in to 0.00394 in].
5.1.1.6
Rinse
and dry plate.
5.1.1.7
Remove
specimens from the stainless steel by lifting
a corner of the sample with a knife or razor exercising care not
to bend or in any way damage the sample.
2215
Sanders Road
Northbrook, IL 60062-6135
IPC-TM-650
TEST
METHODS MANUAL
Number
2.4.18.1
Subject
Tensile
Strength and Elongation, In-House Plating
Date
05/04
Revision
A
Originating Task Group
Rigid Printed Board Performance Task Group
(D-33a)
Material
in this Test Methods Manual was voluntarily established by Technical Committees of 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 IPC.
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5.1.1.8
Inspect
samples and discard those with nicks or
pinholes in the gage length. Specimens should be smooth
and undistorted without scratches from the plate in the gage
length.
5.1.2
Cut Method
5.1.2.1
Clean
the stainless steel panel using a standard acid
or alkali cleaner (preferably reverse current) and verify by per-
forming a water-break test to insure cleanliness.
5.1.2.2
Plate
the panel with a current density equivalent to
production current density to a thickness of 0.05 mm to
0.1 mm [0.00197 in to 0.00394 in].
5.1.2.3
Remove
the copper from the stainless steel by lifting
a corner of the sample with a knife or razor exercising care not
to bend or in any way damage the sample. Cut away and dis-
card the outside 2.5 cm [0.984 in] of the border of the sample.
5.1.2.4
Cut
the specimens (five lengthwise and five cross-
wise) using the sample cutter. Samples shall be smooth,
undistorted (wrinkle free), and free of pinholes, nicks, and
scratches.
5.2
Pre-Test Bake
Bake
all specimens at 125 °C ± 5 °C
[257 °F ± 9 °F] for four - six hours, then allow the samples to
cool to room temperature.
5.3
Test
5.3.1 Mark Gage
Mark
or otherwise note a 50 mm [1.97 in]
gage length to the nearest 0.01 mm [0.000394 in].
5.3.2
Weighing Samples
Weigh
tensile sample to at least
the nearest milligram (0.001 gm). Record the weight and cal-
culate the mean average cross-sectional area. Note: The den-
sity of electrodeposited copper is 8.909 g/cc or 8909 g/mm
3
.
Mean
average thickness in millimeters =
Weight of tensile sample in grams
Area
of tensile sample in mm
2
x
density
of copper in g/mm
3
Mean
average cross-sectional area in mm
2
=
Weight
of tensile sample in grams
Length
of tensile sample in mm x
density of copper in mm g/mm
3
5.3.3
General Test Information
If
the tensile tester is
equipped with an area compensator, dial the mean average
cross-sectional area into it. If not, then the cross-sectional
area has to be used to compute the tensile strength.
Note:
Tensile Strength (Pa) =
Maximum Load (N)
Mean
average cross-
sectional area (m
2
)
or
Tensile
Strength (Mpa) =
Maximum Load (N)
Mean average cross-
sectional area (mm
2
)
or
Tensile
Strength (psi) =
Maximum Load (lbf)
Mean
average cross-
sectional area (in
2
)
To
convert psi to Pa multiply by 6.895 X 10
3
.
To
convert psi to MPa multiply by 6.895 X 10
-3
.
5.3.3.1
If
the tensile tester is equipped with area compensa-
tor, after the test is complete, the Tensile Strength can be
read directly from the chart.
5.3.3.2 Select
an appropriate load range on the tensile
tester so that the expected force is within the acceptable load
range for the cell.
5.3.3.3
Place
the sample in the jaws of the Tensile Tester
being careful that it is properly centered and the axis aligned
with the jaws.
5.3.4
Test
Conditions
5.3.4.1
Gage
length: 50 mm [1.97 in]
5.3.4.2
Cross
Head Speed: 0.05 mm/mm to 0.5 mm/mm
[0.00197 in/in to 0.0197 in/in] per minute of the length of the
reduced section or the distance between the grips for straight
sided specimens.
5.3.4.3
Chart
Speed: 500 mm/min [19.7 in/min]
5.3.5 Evaluation
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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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
P
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