IPC-TM-650 EN 2022 试验方法.pdf - 第256页

5.3.3 Report any presence of laminate degradation as observed in 5.2.1.2. 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 superio…

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 Peel

the test strip back no more than 12.7 mm [0.5 in]

at the tab end.

5.1.5

For

qualification or referee testing purposes, speci-

mens shall be preconditioned by baking at 125 ± 2°C [257 ±

3.6°F] for a minimum of two hours. This preconditioning is in

addition to elevated test temperature requirements on the

appropriate material specification.

5.1.6

Heat

fluid bath to specified temperature and stabilize

at least 5 minutes. Measure temperature approximately 25.4

mm [1.0 in] below surface.

5.2

Measurement

5.2.1 Peel Strength Determination

5.2.1.1

Clamp

the tab end (if present) of each individual test

strip and place specimen and clamp into fluid bath immersing

specimen horizontally approximately 25.4 mm [1.0 in] below

the surface.

5.2.1.2

Fasten

specimen with hold down fixture so that an

unencumbered vertical pull can be exerted. The end of the

test strip and the wire connecting the clamp to the tensile

tester must be free to pull vertically within 5°.

5.2.1.3

Prior

to starting test, allow immersed specimen to

stabilize at the specified temperature for laminates to 0.51 mm

[0.020 in] or for laminates greater than 0.51 mm [0.20 in].

5.2.1.4

Start

test and apply force in the vertical direction at

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

[1.0 in] of the test strip has been pulled, or the strip breaks or

tears. (See 6.1).

5.2.1.5

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.

5.2.1.6

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

results shall be discarded and another strip tested.

5.2.1.7

Perform

the procedure as per 5.2.1.1 through

5.2.1.4 on a minimum of 2 strips per side per specimen. Any

unusual event or irregularity in the data shall be cause to void

the strip’s results and repeat the sequence on a different strip.

5.2.2

Determination of Degradation

Examine

the speci-

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

presence of any base laminate degradation, including loss of

surface resin, discoloration, resin softening, delamination, blis-

tering, propagation of imperfections, measling, crazing, or

voids.

5.3

Calculation and Report

5.3.1

Calculate

the peel strength load as shown:

Lbs/in =

where:

Minimum load

Measured width of peel strip

5.3.2

Record

and report such individual peel strength value

as determined in 5.3.1. 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.

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

2.4.8.2

Subject

Peel

Strength of Metallic Clad Laminates at Elevated

Temperature (Hot Fluid Method)

Date

12/94

Revision

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5.3.3

Report

any presence of laminate degradation as

observed in 5.2.1.2.

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) 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 ounce thickness,

copper plating or solder coating may be used to build up to

0.035 ± 0.0035 mm [0.0014 ± 0.00014 in] to previous strip

strength.

IPC-TM-650

Number

2.4.8.2

Subject

Peel

Strength of Metallic Clad Laminates at Elevated

Temperature (Hot Fluid Method)

Date

12/94

Revision

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1.0

Scope

This

test is designed to determine the peel

strength of the metal cladding to the base laminate while

exposed to elevated temperature by means of heated air

chamber; 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, Keyhole

Method 5.8.3, Peel Strength Test Pattern

3.0

Test Specimens

3.1 Size and Configuration

Specimen

size shall be 50.8 x

50.8 mm [2 x 2 in] by the thickness of the laminate. Cladding

test strips shall be as specified (see 5.1.2).

3.2

Quantity and Sampling

Unless

otherwise specified,

specimens shall be one lengthwise for each clad side and one

crosswise for each clad side. The outside 25.4 mm [1 in] bor-

der of the parent sheet or panel shall be excluded.

4.0

Apparatus or Material

4.1 Tensile Tester

tensile strength tester equipped with

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

[0.01 lbs.] and a light load wire or chain and clamp at least

457 mm [18 in] long (its weight is included in the load cell cal-

culation). The clamp jaws must cover the entire conductor

width of each peel strip tab. Any equipment or apparatus

having the described accuracy, precision, and reproducibility

may be used.

4.2

Thermal Chamber

enclosure of the specimen loca-

tion of the tester, capable of maintaining the test temperatures

as specified, to within 3°C [5.4°F].

4.3

Specimen Hold-down

suitable hold-down clamping

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

650, Method 2.4.8.1.

4.4

Oven

Circulating

air oven capable of maintaining 125 ±

2°C [257 ± 3.6°F].

4.5

Timer

Timing

device capable of timing to within 1

second.

4.6

Measuring

device capable of measuring from 0.0000 to

12.7 mm [0.0000 to 0.50 in] to within 0.0127 mm [0.0005 in].

4.7 Etching

system capable of complete removal of metal

cladding.

4.8

Etch Resist Materials or Systems

4.8.1

Printer’s

tape, or equivalent, of the specified width

(see 5.1.4) to act as etch resist for strip formation.

4.8.2

Photo

resist system (printing, developing, and strip-

ping).

5.0

Procedure

5.1 Specimen Preparation

5.1.1

Cut

the specimens from the laminate sample. Speci-

mens shall be taken no closer than 2.54 mm [1.0 in] from the

edge of the laminate sheet.

5.1.2

Specimens

shall be prepared with suitable etch resist

material so that four strips of 3.18 mm [0.125 in] width are

etched, and then cleaned and processed using standard

industry practices and equipment. For qualification and ref-

eree testing, the specimens shall be photo-imaged in accor-

dance with Method 5.8.3 of IPC-TM-650, except that tab

ends are optional.

Specimens shall be etched so that the test strips on one

specimen are in one direction per Figure 2. Double clad lami-

nate shall have each side tested using separate specimens.

The opposite side cladding shall be either fully removed or left

fully clad. Separate samples for both the warp and fill direc-

tions are required for each side. For referee testing, the clad-

ding on the opposite side shall not be removed.

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 1). For referee testing

of single sided laminates less than 0.51 mm [0.020 in], the

specimens shall be bonded to a rigid substrate or laminate.

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.4.8.3

Subject

Peel

Strength of Metallic Clad Laminate at Elevated

Temperature (Hot Air Method)

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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