IPC-TM-650 EN 2022 试验方法.pdf - 第289页

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 care…

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

Mean

average thickness in millimeters =

Weight of tensile sample in grams

Area

of tensile sample in mm

density

of copper in g/mm

Mean

average cross-sectional area in mm

Weight

of tensile sample in grams

Length

of tensile sample in mm x

density of copper in mm g/mm

5.3.3

General Test Information

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

)

Tensile

Strength (Mpa) =

Maximum Load (N)

Mean average cross-

sectional area (mm

)

Tensile

Strength (psi) =

Maximum Load (lbf)

Mean

average cross-

sectional area (in

)

convert psi to Pa multiply by 6.895 X 10

convert psi to MPa multiply by 6.895 X 10

-3

5.3.3.1

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

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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.

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

age3of3

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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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