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Povrchové ochrany elektronických sestav

Authors: Rous, Pavel;

Povrchové ochrany elektronických sestav

Abstract

This thesis deals with the problem of conformal coatings and their parameters. The thesis summarizes the negative effects on printed circuit boards and the properties of conformal coatings that help to protect against negative effects. The result of this work is a filled database which is designed with the possibility of adding new conformal coatings and offer searches for important parameters to facilitate the selection of a suitable conformal coating.

Tato práce se zaobírá problematikou konformních povlaků a jejich parametrů. V práci jsou shrnuty negativní vlivy působící na desky plošných spojů a vlastnosti konformních povlaků, které pomáhají před negativními vlivy chránit. Výsledkem práce je dále navržená a naplněná databáze konformních povlaků s možností přidání nových povlaků a následné vyhledávání dle důležitých parametrů pro usnadnění výběru vhodného konformního povlaku.

Obhájeno

Country
Czech Republic
Related Organizations
Keywords

nečistoty, conformal coating, corrosion, vlivy prostředí, printed circuit board, vlhkost, temperature, koroze, dirt, elektrochemická migrace, moisture, konformní povlak, environmental influences, electrochemical migration, teplota, deska plošného spoje

25 references, page 1 of 3

SEZNAM SYMBOLŮ A ZKRATEK .............................................................................................................9 AR...................... Acrylic Resin ER ...................... Epoxy Resin SR ...................... Silicone Resin UR...................... Urethane (Polyurethane) Resin XY ..................... Paraxylylen UT...................... Ultra-Thin Coatings SC ...................... Styrene Block Co-Polymer DPS.................... Deska plošných spojů PCB.................... Printed Circuit Boards THT ................... Through hole technology SMT ................... Surface mount technology IPC ..................... The Institute of Printed Circuit UV ..................... Ultraviolet DLA ................... Defense Logistics Agency QPL.................... Qualified Products List Viskozita nevytvrzeného povlaku typu AR, ER, SR, UR se měří testovací metodou ASTM D-1084, výrobce musí udat za jakých podmínek byl test prováděn. [31] Maximální povolená procentuální změna v Q AR ER SR UR XR 9 8 8 5 8 19 10 12 8 7 9 14 12 10 11 9 12 10 10 11 5 15 12 10 7 7 20 16 10 7

[1] S. Sattel, „The History of PCBs 1870 - Present,“ Autodesk, 2016. [Online]. Available: https://www.autodesk.com/products/eagle/blog/history-of-pcbs/. [Přístup získán 6 Leden 2019].

[2] „A Short History of the Short History of Printed Circuit Boards,“ Nine Dot Connects, 3 Únor 2016. [Online]. Available: https://www.youtube.com/watch?v=mb6KnEae5Mw. [Přístup získán 6 Leden 2019].

[3] J. Brown, „The History of Printed Circuit Boards - Infographic,“ PCB solutions, Leden 2013. [Online]. Available: https://www.pcb-solutions.com/pcb-market-monitor/the-history-of-pcb-infographic/. [Přístup získán 21 Leden 2019].

[4] C. Cavette, „How printed circuit board is made,“ How Products are Made, 2019. [Online]. Available: http://www.madehow.com/Volume-2/Printed-Circuit-Board.html. [Přístup získán 6 Leden 2019]. [5] G. Dalakov, „The Printed Circuit Board of Paul Eisler,“ History of Computers, 2019. [Online]. Available: http://history-computer.com/ModernComputer/Basis/printed_board.html. [Přístup získán 6 Leden 2019].

[6] „PCBs for Harsh Environments,“ Millennium Circuits Limited, 7 Duben 2018. [Online]. Available: https://www.mclpcb.com/pcbs-harsh-environments/. [Přístup získán 6 Leden 2019].

[7] Electrolube, „Protecting electronics from corrosive operating environments to increase end-product lifetime and reliability,“ Electrolube, 2019. [Online]. Available: https://www.electrolube.com/ technical-articles/protecting-electronics-from-corrosive-operating-environments/. [Přístup získán 15 Únor 2019].

[8] „What Is Conformal Coating?,“ Electrolube, 2018. [Online]. Available: https://www.electrolube.com/ products/what-is-conformal-coating.html. [Přístup získán 6 Leden 2019].

[9] „Thermal and Humidity Effects on Electronic Equipment,“ electronicsforu, 15 Srpen 2018. [Online]. Available: https://electronicsforu.com/electronics-projects/electronics-design-guides/thermal-humidityeffect-electronic-equip. [Přístup získán 25 Únor 2019].

[10] A. Nerandžič, „Meteorologie pro elektrotechniky,“ Elektro časopis pro elektroniku, Prosinec 2019. [Online]. Available: http://www.odbornecasopisy.cz/elektro/casopis/tema/meteorologie-pro-elektrotechniky--11469. [Přístup získán 25 Únor 2019].

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  • citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    0
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Average
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Average
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Average
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average