IPC-TM-650 EN 2022 试验方法.pdf - 第249页

5.1.1 Cut the specimens from the laminate sample. Speci- mens shall be taken no closer than 25.4 mm [1.0 in] from the edge of the laminate sheet as manufactured. 5.1.2 Specimens shall be prepared with at least four resis…

1.0

Scope

This

test method is designed to determine the

peel strength of metallic cladding when tested in the following

conditions, ‘‘as received,’’ after thermal stress, and after

exposure to processing chemicals; and to evaluate the base

laminate material after the peel strength test is completed for

degradation due to the conditioning.

2.0

Applicable Documents

IPC-TM-650

Method

2.4.8.1, Peel Strength, Metal Foil (Keyhole Method for

Thin Laminates)

Method 5.8.3, Peel Strength Test Pattern

3.0

Test Specimens

3.1 Size and Configuration

Specimens

shall be 50.8 mm

x 50.8 mm [2.0 x 2.0 in] by the thickness of the laminate.

Cladding test strips shall be as specified (see 5.1.2).

3.2

Quantity and Sampling

least 2 specimens per clad

side per each test condition (see 5.2) shall be taken at random

from the laminate lot. They may be taken from samples used

for other QA testing or inspection. One specimen per side

shall be used for crosswise and one specimen per side for

lengthwise testing.

4.0

Apparatus or Material

4.1 Tensile Tester

tensile strength tester equipped with

a load cell, capable of measuring to the nearest 0.0045 kg

[0.01 lbs], and light load wire or chain and clamp at least 457

mm [18.0 in] long (its weight is included in the load cell calcu-

lation). The clamp jaws must cover the entire width of each

peel strip. Any equipment or apparatus having the described

accuracy, precision, and reproducibility may be used.

4.2

Solder Pot

solder bath or pot capable of maintaining

solder at the specified temperature when measured 25.4 mm

[1.0 in] below the surface. Type Sn60 or Sn63 solder shall be

used.

4.3

Specimen Hold-down

suitable hold-down clamping

system equivalent in performance as that defined in IPC-TM-

650, Method 2.4.8.1.

4.4

Chemicals

minimum of two ounces of the following

processing solutions:

4.4.1

Organic

chemical stripper, such as Methylene Chlo-

ride, or equivalent

4.4.2

Sodium

Hydroxide 10 gr/liter

4.4.3

Boric

Acid 30 gr/liter and Sulfuric Acid 10 gr/liter

4.4.4

Organic

degreaser, such as isopropyl alcohol, or

equivalent.

4.5

Hot

fluid bath, capable of being maintained at the speci-

fied temperature, when measured 25.4 mm [1.0 in] below the

surface.

4.5.1

Dow

Silicone Fluid No. 704, or equivalent.

4.6

Dow

Silicone Grease, Compound 4, or equivalent.

4.7

Data Collection

For

qualification testing, a recording

system capable of permanent data retention must be incorpo-

rated into the test apparatus.

4.8

Etching

system capable of complete removal of metallic

cladding.

4.9

Measuring

device capable of measuring from 0.000 to

12.7 mm [0.5 in] to within ± 0.0025 mm [0.0001 in].

4.10

Etch Resist Materials or Systems

4.10.1

Platers

tape, or equivalent, to act as etch resist for

strip formation of the specified widths (see 5.2.1.1, 5.2.2.1,

and 5.2.3.1).

4.10.2

Photoresist

system (printing, developing, and stripping).

5.0

Procedure

5.1 Specimen Preparation

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.4.8

Subject

Peel

Strength of Metallic Clad Laminates

Date

12/94

Revision

Originating Task Group

MIL-P-13949 Test Methods Task Group (7-11b)

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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5.1.1

Cut

the specimens from the laminate sample. Speci-

mens shall be taken no closer than 25.4 mm [1.0 in] from the

edge of the laminate sheet as manufactured.

5.1.2

Specimens

shall be prepared with at least four resist

strips of the width specified (see 5.2.1.1, 5.2.2.1, 5.2.3.1),

etched, cleaned and processed using standard industry prac-

tices and equipment. For qualification and referee testing the

specimen shall be photoimaged in accordance with the art-

work shown in Method 5.8.3 of IPC-TM-650 except that tab

ends are optional. Specimens shall be etched so that the

conductor strips on one specimen are in one direction per

Figure 1. Double clad laminate shall have each side tested

using separate specimens. The opposite side cladding shall

be either fully removed or left fully clad. For referee testing the

cladding on the opposite side shall remain. Separate speci-

mens for both the warp and fill directions are required for each

side.

5.1.3

Thin

specimens may be provided with support by

bonding them to a rigid substrate base, or may be tested with

the aid of the keyhole fixture (see Figure 2). For referee testing

of laminates less than 0.51 mm [0.020 in], the specimens shall

be bonded to a rigid substrate or laminate.

Note:

Peel

values can be affected by the adhesive used to

bond the specimen to the rigid substrate. It is imperative that

the best adhesive be found for the type of materials being

bonded to least influence the true peel strength value.

5.1.4

For

referee testing and qualification, specimens shall

be preconditioned by baking at 125°C [257°F] for4±0.5

hours.

5.2

Measurements

5.2.1 Condition A Peel Strength: As Received

5.2.1.1

minimum of two 3.18 mm [0.125 in] test strips per

specimen shall be peeled. For qualification testing four 3.18

mm [0.125 in] strips per specimen shall be peeled.

5.2.1.2

Adjust

the measurement system to compensate for

the weight of the wire and clamp.

5.2.1.3

Peel

the test strip back at the tab end (if present) no

more than 12.7 mm [0.5 in]. Attach the clamp to the peeled

back end of the test strip.

5.2.1.4

Fasten

specimen with hold down fixture so that an

unencumbered vertical pull can be exerted. The end of the

test strip should be in a vertical position ready for testing. The

wire connecting the clamp to the tensile tester must be free to

pull vertically within ± 5° angle.

5.2.1.5

Start

tester and apply force in the vertical direction

at the rate of 50.8 mm [2.0 in]/minute, until at least a 25.4 mm

[1.0 in] peel is completed (see Note 6.1).

5.2.1.6

Observe

and record the minimum load as defined

by Figure 1. Measure the actual width of the test strip and

record with the minimum load.

5.2.1.7 If

the full width of the test strip does not peel, the

results shall be discarded and another strip tested.

5.2.2

Condition B Peel Strength: After Thermal Stress

5.2.2.1

minimum of two 3.18 mm [0.125 in] test strips per

specimen shall be peeled. For qualification testing four 3.18

mm [0.125 in] strips per specimen shall be peeled.

5.2.2.2

Apply

a thin coating of silicon grease to specimens

and float on solder maintained at 288°C ± 5.5°C [550°F ±

10°F] for 10 seconds, +1, -0.

5.2.2.3

Cool

specimens to laboratory ambient temperature,

Clean the grease off and perform steps 5.2.1.2 through

5.2.1.7.

5.2.3

Condition C Peel Strength: After Exposure to Pro-

cessing Chemicals

5.2.3.1

minimum of two 0.79 mm [0.032 in] test strips per

specimen shall be peeled. For qualification and conformance

four 0.79 mm [0.032 in] strips per specimen shall be used.

5.2.3.2 Immerse

in organic stripper as specified in 4.4.1 for

75 ±5 seconds at 23 ±2°C [73.4 ±3.6°F].

5.2.3.3

Dry

specimens 15 ± 5 minutes at 125 ± 5°C [257 ±

9°F].

5.2.3.4

Immerse

in a solution of 10 gr/liter sodium hydrox-

ide at 90 ± 5°C [194 ± 9°F] for 5 ±1 minutes.

5.2.3.5

Rinse

in hot tap water at 50–55°C [122–131°F] for 5

± 1 minutes.

5.2.3.6

Immerse

for 30 ±5 minutes in a solution of 10 gr/liter

sulfuric acid (sp. gr. 1.836) and 30 gr/liter boric acid solution

at 60 ± 5°C [140 ± 9°F].

IPC-TM-650

Number

2.4.8

Subject

Peel

Strength of Metallic Clad Laminates

Date

12/94

Revision

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5.2.3.7

Rinse

in hot water at 55 ± 5°C [131 ± 9°F] for5±1

minutes.

5.2.3.8

Dry

for 30 ± 5 minutes at 125 ± 5°C [257 ± 9°F].

5.2.3.9

Immerse

in a hot oil bath maintained at 220 ± 5°C

[428 ± 9°F] for 40 ± 5 seconds.

5.2.3.10

Immerse

in degreaser as specified in 4.4.4 at 23 ±

2°C [73.4 ± 3.6°F] for 75 ± 5 seconds to remove hot oil.

5.2.3.11

Air

dry specimens and perform steps 5.2.1.2

through 5.2.1.7.

5.2.4

Determination of Degradation

Examine

the speci-

mens using normal or corrected 20/20 vision. Record and

report the presence of any base laminate degradation, includ-

ing loss of surface resin, discoloration, resin softening, delami-

nation, blistering, propagation of imperfections, measling,

crazing, or voids.

5.3

Calculation and Report

5.3.1

Calculate

the peel strength as per the formula:

lbs/in =

where:

Minimum Load

Measured width of peel strip

5.3.2

Record

and report each individual peel strength value.

Average the individual peel strength values for each side and

each grain direction of the laminate sampling. For example, if

the sampling plan calls for one specimen per side and per

grain direction, there will be at least two values to be averaged

from four different specimens.

5.3.3

Report

any presence of laminate degradation as

observed in 5.2.4

6.0 Notes

6.1

Test

strip breakage may be caused by either a bond

greater than the tensile strength of the foil, or foil brittleness.

Where superior bond is shown (value at break above specifi-

cation) the value at break may be used instead of minimum

peel. The average reported shall indicate that the value is

greater than average.

6.2 For

metallic cladding less than one oz thickness, copper

plating or solder coating may be used to build up to 0.035 ±

0.0035 mm [0.0014 ± 0.00014 in] to provide strip strength.

6.3

Environmental

aspects of chemicals as specified in 4.4.1

and 4.4.4. Based on industry and government policies toward

chemicals which are hazardous to worker health or of concern

for ozone depletion, previous requirements for use of Methyl-

ene Chloride and 1,1,1 Trichloroethane have been replaced

with equivalents.

IPC-I-002102

Figure

1 Multiple Failure Modes

Peel Distance

▼

Load

High Peel Strength

Failure Mode

Low Peel Strength

Failure Mode

Minimum

Average

Load

IPC-TM-650

Number

2.4.8

Subject

Peel

Strength of Metallic Clad Laminates

Date

12/94

Revision

age3of3

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