IPC-TM-650 EN 2022 试验方法.pdf - 第251页

1 Scope This method is designed to determine the peel strength of metal foil when bonded to thin laminates. Peel strength is determined for specimens as received or after con- ditioning, such as solder immersion or eleva…

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

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Scope

This

method is designed to determine the peel

strength of metal foil when bonded to thin laminates. Peel

strength is determined for specimens as received or after con-

ditioning, such as solder immersion or elevated temperature

exposure.

Applicable Documents

IPC-TM-650

Test

Methods Manual

2.4.8 Peel Strength of Metallic Clad Laminates

Test Specimen

Bonded

metal foil with peel strength test

patterns 3 mm wide and up to 76 mm long (each specimen is

about 60 mm to 76 mm long)

Apparatus

4.1

Force

gage or testing machine capable of a travel speed

of 5 cm per minute with a range of 1 kg to 1.4 kg and 4.5 g

minimum scale divisions

4.2

Keyhole

test plate per Figure 1, or equivalent

4.3

Keyhole

horizontal base fixture per Figure 2

4.4

Chain

61 cm to 71 cm

4.5 Surgical

hemostat

4.6

Cylindrical

spring paper clips (Boston clip No. 4, Hunt

Mfg. Co.)

4.7

Chain

to hemostat adapter, per Figure 3 (approximately

76 mm long)

4.8

Scalpel

Procedure

5.1 Preparation

5.1.1

Cut

specimens from a laminated or bonded and

etched panel and trim to the edge of the peel tabs.

5.1.2

Make

a cut about 6.35 mm to 9.5 mm along each side

of the peel tab, bend up the peel tab 90°, break the laminate,

and pull up without breaking the foil.

5.1.3

Pull

up the foil about 3 mm to 6.35 mm for about a 9.5

mm to 13 mm starting length (a scalpel can be used to start

the foil peel).

5.2

Conditioning

specimens are to be conditioned ,the

conditions in IPC-TM-650, Method 2.4.8, shall be used. Other

conditions of specifications working this method as applicable

may be used.

5.3

Test

5.3.1

Place

the specimen on the base fixture, metal foil side

up, and center the peel strip on the base.

IPC-2-4-8-1-1

Figure

1 Keyhole Test Plate

8.5 cm

± 0.13 cm

‘‘A”

3.8 cm ± 0.25 cm

2 cm

± 0.25 cm

13.5 cm

± 0.25 cm

8 cm ± 0.25 cm

1.9 cm

Blend entry edge of

hole into bevel of slot

0.4 cm ± 0.013 cm (Slot)

0.3 cm thick

AL Alloy

AA6061 T651

18 ± 2

0.41 cm Ref.

Section “A”-“A” Bevel detail 4x

+ 0.02 cm

- 0.013 cm

dia. hole

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.4.8.1

Subject

Peel

Strength, Metal Foil (Keyhole Method For Thin

Laminates)

Date

1/86

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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5.3.2

Place

the keyhole plate over the peel strip with the tab

in the large hole and the strip centered in the slot.

5.3.3

Clamp

the keyhole plate to the base with the paper-

clips, making sure the alignment is not disturbed.

5.3.4

Attach

the hemostat to the tab so the peel will be 90°

to the strip (the hemostat should be attached to the chain with

the adapter and hanging from the tester jaws or force gage so

that the tab can be clamped without excessive bending or

damage).

5.3.5

Start

the vertical pull (5 cm per minute) with the test

head and initiate a chart recorder or visually observe the mini-

mum and pull force.

5.3.6

Lower

the head or force gage to position for starting

the next peel strip and repeat starting at 5.2.1.

IPC-2-4-8-1-2

Figure

2 Keyhold Horizontal Axis

10 cm ±

0.25 cm

(2) .138-32UN-2B

0.025 cm dia.

0.064 cm

± 0.05 cm

10 cm ± 0.25 cm

0.475 cm

± 0.025 cm

0.95 cm ±

0.025 cm

0.064 cm

AL Allo

0.475 cm

± 0.05 cm

0.95 cm ± 0.075 cm

MS 16995

SCR CAP SOC HD

10.5 cm

± 0.075 cm

AA6061 T651

0.475 cm

± 0.025 cm

1.9 cm

± 0.025 cm

0.4 cm

+ 0.013 cm

- 0.0075 cm

dia.

2 holes

0.32 cm thic

AL Alloy

AA6061 T651

IPC-TM-650

Number

2.4.8.1

Subject

Peel

Strength, Metal Foil (Keyhole Method For Thin Laminates)

Date

1/86

Revision

age2of3

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