Preparation method for Printed circuit board

Preparation method for Printed circuit board

10:35 - 13/07/2020

What is the right preparation method for Printed circuit board? Let study it with QATM' solutions. Cutting, Mounting, Grinding & Polishing machine

Lithium - Ion battery sample preparation method

Steps

Recommended machines

Remarks

 

CUTTING

ATM Brillant

- Cut-off wheel: corundum, resin bond
- Anti-corrosion coolant

 

MOUNTING

ATM Opal

- Cold mounting: KEM 20

 

GRINDING/
POLISHING

Sample size
Ø 40 mm

Pressure parameters and specimen size

25

30

40

50

60

-(5~10)N

-5N

0

+5N

+(5~10)N

 

 

Step

Medium

Coolant


Speed (rpm)


Rotate direction


Pressure (N)

Time

(min)

Planar grinding

SiC P180
(82 µm)

H2O

250~300

►►

Synchronous
Rotation

30

Until plane (slightly before
point of interest)

 

Grinding

SiC P800
(21.8 µm)

H2O

250~300

►►

Synchronous
Rotation

25

1:00 (until point of interest)

 

Grinding

SiC P1200
(15.3 µm)

H2O

250~300

►►

Synchronous
Rotation

25

1:00 (until point of interest)


Polishing

Vải lụa GAMMA

Dung dịch  Dia-Complete Poly, 3 µm

120~150

►►

Synchronous
Rotation

30

3:00

Final polishing

Vải tổng hợp OMEGA

Eposal,
0.06 µm

120~150

◄ ►

Counter
Rotation

25

2:00
(H2O during final 0:30)

 

 

 

BEGINNERS GUIDE :

 

Step

Detailed instructions

 

 CUTTING

 - Use suitable cut-off wheels for ferrous material (e.g. ATM FS-E wheels)
 - Cutting speed max. 0.25 mm/s

 

MOUNTING

- Use mounting material for almost gap-free mounting
- Cold mounting with pressure unit/vacuum

 

GRINDING

- Start grinding with SiC-paper/foil P180
- Continue with P800 and P1200
- Thoroughly wash samples and holder under running water after each grinding step

 

POLISHING

- Rinse the polishing discs with water and spin dry after use
- Do not stack discs with different diamond sizes
- Clean samples, holders and hands under running water before each polishing step
- Use ethanol and blow dryer to avoid water stains
- Check after each step under the microscope if polishing marks are of equal size and randomly oriented
- Use the consumables only for printed circuit boards and not for other materials
- Rinse the cap of the Eposal bottle after use, put cap back on
- Use cosmetic tissues to clean possible traces of Eposal after the last polishing step

 

SAMPLE MICROGRAPHS:

OK Sample polished

NOK Sample polished

- No traces of scratches
- Clear structure/contour of the different
phases

 

• Sparse scratches from 0.06 µm Eposal after
OMEGA
» Clean all polishing discs with clean brush
under running water
» Clean sample and sample holder
» Repeat OMEGA step

  

20x micrograph of printed circuit board (non assembled) after OMEGA polishing

 

TÀI LIỆU THAM KHẢO:

https://www.qatm.com/applications/preparation-methods/