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/