Ho ntlafatsa PCB Td bakeng sa Tlhahiso e Tšepahalang ea Boto ea Potoloho

Selelekela sa Td Value ho PCB

Ha ho tluoa tabeng ea ho rala le ho etsa Liboto tsa Potoloho tse Hatisitsoeng ( li-PCB ), Mocheso oa ho Bola (Td) ke paramethara ea bohlokoa e bapalang karolo ea bohlokoa ho netefatseng botšepehi ba ts'ebetso ea tlhahiso le botšepehi ba nako e telele ba sehlahisoa sa ho qetela. Ka mantsoe a bonolo, boleng ba Td bo emela mocheso oo thepa ea PCB e qalang ho senyeha kapa ho bola ka lik'hemik'hale. Moeli ona oa mocheso ha se feela tlhaloso ea tekheniki - o hlalosa moeli oa mocheso oo thepa ea 'mele le ea motlakase ea thepa e senyehang ho oona.

Ho utloisisa boleng ba Td ho bohlokoa haholo hobane e tsebisa liqeto tsa bohlokoa nakong ea meralo le mekhahlelo ea tlhahiso ea nts'etsopele ea PCB. Nakong ea tlhahiso, haholo-holo lits'ebetsong tse kang soldering le reflow, li-PCB li pepesehela mocheso o phahameng. Haeba Td ea thepa e le tlase haholo, mocheso o feteletseng o ka baka tšenyo ea lik'hemik'hale, e leng se lebisang mathateng a mangata a kang delamination, ho fokolloa ke manonyeletso a solder, le ho hlōleha ha sehlahisoa qetellong. Ka hona, ho khetha lisebelisoa tse nang le boleng bo nepahetseng ba Td ho netefatsa hore PCB e khona ho mamella likhatello tsa mocheso tseo motho a kopanang le tsona nakong ea tlhahiso, le joalo ka bohlokoa, bophelong bohle ba eona ba ts'ebetso.

Liindastering tsa kajeno tse hlokang matla-ho tloha ho tsa likoloi le tsa sefofane ho ea ho lithelefono-moo li-PCB li tlamehang ho sebetsa tlas'a maemo a thata a mocheso, boleng ba Td bo fetoha metric ea bohlokoa e ka susumetsang haholo ts'ebetso, botšepehi le nako ea bophelo ea lisebelisoa tsa elektroniki. Ka ho hlahloba ka hloko le ho khetha thepa ho latela litekanyetso tsa bona tsa Td, baenjiniere ba ka ntlafatsa ts'ebetso ea PCB ho fihlela litlhoko tse khethehileng tsa mocheso oa lits'ebetso tsa bona, ho netefatsa hore lisebelisoa tsa elektroniki tse tšoarellang nako e telele le tse tšepahalang.

Bohlokoa ba Td Value Tlhahisong ea Boto ea Potoloho

Lintlha tsa Tlhahiso bakeng sa li-PCB tse sebetsang hantle

Nakong ea tlhahiso ea PCB — haholo-holo lits'ebetsong tse kang ho kopanya, ho kopanya hape, le ho kopanya maqhubu — thepa e tlameha ho mamella mocheso o phahameng oo hangata o pakeng tsa 220°C le 250°C. Thepa ea PCB e nang le boleng ba Td bo kaholimo ho mocheso ona o phahameng oa ts'ebetso e netefatsa botsitso ba mocheso 'me e thibela mathata a tloaelehileng a kang ho arola, ho ntša khase, kapa manonyeletso a fokolang a ho kopanya.

Mohlala, ho li-PCB tse maemong a holimo tse sebelisoang lisebelisoa tsa mehala ea mehala, ho boloka botšepehi nakong ea tlhahiso ho bohlokoa. Lisebelisoa tse phahameng tsa Td li khethiloe ka ho khetheha hore li mamelle lipotoloho tse potlakileng tsa mocheso oa lisebelisoa tse phahameng ka potlako ntle le ho senya ts'ebetso ea motlakase ea boto kapa sebopeho sa mochine.

Ho khetha lisebelisoa tse nang le boleng bo phahameng ba Td ho fana ka baetsi ba boto ea potoloho ka kholiseho ea hore PCB e tla boloka botšepehi nakong ea tlhahiso le ts'ebetso, ho fokotsa kotsi ea ho hloleha pele ho nako.

Ntlafatso ea Ts'ebetso le Botšepehi ba Lisebelisoa tsa Elektronike

Td boleng le eona e bapala karolo ea bohlokoa ho ts'epahalang ha nako e telele ea lisebelisoa tsa elektroniki. Hangata liboto tsa potoloho li tlas'a mefuta e fapaneng ea khatello ea tikoloho nakong ea bophelo ba tsona ba ts'ebetso, joalo ka ho palama libaesekele tse futhumetseng, ho sisinyeha ha mochini, le ho pepesehela mongobo. Lisebelisoa tse nang le boleng bo phahameng ba Td li hlomelloa hamolemo ho sebetsana le maemo ana, ho boloka ts'ebetso ea PCB le ho lelefatsa nako ea bophelo ea sesebelisoa.

Likopong tse kang lisebelisoa tsa elektronike tsa likoloi, moo li-PCB li tlamehang ho mamella mocheso o feteletseng libakeng tse kang likarolo tsa enjene, ho sebelisa lisebelisoa tse nang le boleng bo phahameng ba Td ho tiisa hore boto e lula e sebetsa ho sa tsotellehe maemo a thata. Maemong a joalo, boleng ba Td bo ama ka kotloloho ho tšoarella le Mean Time Between Failures (MTBF) ea sesebelisoa, e leng se etsang hore e be lintlha tsa bohlokoa bakeng sa liboto tsa potoloho tse tšepahalang haholo.

Ho ntlafatsa boleng ba Td ho PCB Fabrication

Ho Khetha Lisebelisoa tsa PCB tse sebetsang hantle

Khetho ea lisebelisoa tse nang le litekanyetso tse phahameng tsa Td ke e 'ngoe ea litsela tse sebetsang ka ho fetisisa tsa ho netefatsa botsitso ba mocheso ho li-PCB tse sebetsang hantle. Lisebelisoa tse kang polyimide, high-Tg FR-4, le li-ceramic-based substrates li sebelisoa hangata ho etsa liboto tsa potoloho moo mocheso o feteletseng o lebelloang. Ka mohlala, polyimide laminates, tse tsejoang ka boleng ba tsona ba Td tse fetang 400 ° C, li sebelisoa khafetsa sebakeng sa sefofane, sesoleng le lisebelisoa tsa elektronike tse tšepahalang haholo.

Likarolong tsa lithelefono le lits'ebetso tsa data, moo botšepehi ba matšoao le botsitso ba mocheso e leng tsa bohlokoa, lisebelisoa tse nang le boleng bo phahameng ba Td li netefatsa hore boto ea potoloho e sebetsa hantle tlas'a liphetoho tse potlakileng tsa mocheso, e leng se etsang hore e be khetho e ratoang bakeng sa baqapi le bahlahisi.

Ho Laola Mekhahlelo ea Tlhahiso bakeng sa Botsitso bo Botle ba Thermal

Esita le ha u sebelisa lisebelisoa tse phahameng tsa Td, ho laola ka hloko mekhoa ea ho etsa lihlahisoa ho bohlokoa ho eketsa botsitso ba mocheso. Mekhahlelo ea lamination joalo ka mocheso, khatello, le nako e lokela ho ntlafatsoa ho matlafatsa maqhama a lintho tse bonahalang le ho ntlafatsa bokhoni ba eona ba ho mamella meroalo e phahameng ea mocheso.

Mekhoa e tsoetseng pele ea ho phekola holim'a metsi, joalo ka Electroless Nickel Immersion Gold ( ENIG ) le Organic Solderability Preservative ( OSP ), e ka sireletsa bokaholimo ba boto haholo nakong ea ho kopanya, e thusa ho boloka boleng ba Td ba thepa le khanyetso ea mocheso ka kakaretso.

Ho Sebelisa Li-additives ho Ntlafatsa Boleng ba Td

Ho kenyelletsa li-additives tse kang li-flame retardants, metsoako ea brominated, kapa phosphate esters ho ka ntlafatsa ho hanyetsa mocheso oa thepa ea PCB, ka katleho ho matlafatsa boleng ba bona ba Td. Leha ho le joalo, ho kenyelletsa metsoako ena ho tlameha ho leka-lekana le ho nahanela ts'ebetso ea motlakase le botšepehi ba matšoao, kaha li-additives tse ling li ka ama thepa ea dielectric ea PCB.

Li-PCB tsa maqhubu a phahameng, ho netefatsa hore thepa e boloka boleng bo phahameng ba Td le ts'ebetso e ntle ea motlakase ho bohlokoa ho qoba ho senyeha ha phetiso ea mats'oao, e ka senyang ts'ebetso ea lisebelisoa tsa mehala kapa lisebelisoa tse ling tsa elektroniki tse hlokolosi.

Ho Sebelisa Phekolo ea Mocheso Bakeng sa Ntlafatso ea Td

Kalafo ea mocheso e ka sebelisoa ho imolla khatello ea ka hare ho thepa ea PCB , ho ntlafatsa botsitso ba eona ba mocheso ka kakaretso le ho eketsa boleng ba eona ba Td. Ka ho sebelisa ka hloko lipotoloho tse laoloang tsa ho futhumatsa le ho pholisa nakong ea ts'ebetso ea tlhahiso, bahlahisi ba PCB ba ka ntlafatsa kristale ea matrix ea polymer ka har'a thepa, e leng se fellang ka thepa e betere ea mocheso le ea mechini. Leha ho le joalo, taolo e nepahetseng holim'a ts'ebetso ena ea bohlokoa ho qoba ho futhumatsa ho feteletseng, ho ka senyang thepa kapa thepa ea eona ea motlakase.

Lisebelisoa tse Tloaelehileng tsa PCB le Maemo a Tsona a Td

Ka lisebelisoa tsa PCB, Td (Decomposition Temperature) e fapana ho latela mofuta oa thepa. Mona ke litekanyetso tse khethehileng tsa Td bakeng sa lisebelisoa tse tloaelehileng tsa PCB:

1. FR-4 (E Tloaelehileng):
   • Td Range: 300 ° C ho isa ho 330 ° C
   • Sena ke ka ho fetisisa ho pharaletseng sebelisoa lintho tse bonahalang bakeng sa kakaretso-morero PCBs. E fana ka botsitso bo botle ba mocheso bakeng sa lisebelisoa tse ngata tsa elektroniki tsa khoebo.
2. Phahameng-Tg FR-4:
   • Td Range: 340 ° C ho isa ho 370 ° C
   • Lisebelisoa tse phahameng tsa Tg FR-4 li sebelisoa lits'ebetsong tse hlokang ho feta moo khatello e phahameng ea mocheso le mochini e leng teng, joalo ka li-PCB tsa likoloi kapa tsa indasteri.
3. Polyimide:
   • Td Range: 390 ° C ho isa ho 420 ° C
   • Polyimide ke lisebelisoa tse sebetsang hantle tse atisang ho sebelisoa sebakeng sa lifofane, sesoleng le lits'ebetsong tsa mocheso o phahameng ka lebaka la ho hanyetsa mocheso o phahameng.
4. laminate e khethehileng e nang le tahlehelo e tlase (Lisebelisoa tsa PCB tse nang le maqhubu a phahameng):
   • Td Range: 360 ° C ho isa ho 400 ° C
   • Malapa a khethehileng a laminate a nang le tahlehelo e tlase a sebelisoa lits'ebetsong tsa maqhubu a phahameng le RF. Lisebelisoa tsena li fana ka botsitso bo phahameng ba mocheso le thepa e ntle ea motlakase bakeng sa litsamaiso tsa puisano le tsa radar.
5. Li-PCB tse thehiloeng ho Ceramic:
   • Td Range: Ka holimo ho 400°C
   • Li-PCB tse thehiloeng ka ceramic li sebelisoa libakeng tse futhumetseng haholo, joalo ka lisebelisoa tsa elektroniki tsa motlakase, moo ho hlokahalang hore ho be le conductivity e phahameng ea mocheso le ho hanyetsa mocheso o feteletseng.

Boleng bona ke mefuta e akaretsang, 'me lisebelisoa tse ikhethileng ka har'a sehlopha ka seng li ka ba le boleng bo fapaneng hanyane ho latela litlhaloso tsa moetsi. Khetho ea thepa ea PCB e nang le boleng bo nepahetseng ba Td e bohlokoa bakeng sa ho netefatsa ho ts'epahala lits'ebetsong tsa tlhahiso le tikolohong ea ts'ebetso.

Ho Utloisisa Kamano lipakeng tsa Td le Tg

Td (Decomposition Temperature)

• Tlhaloso: Td ke mocheso oo lisebelisoa tsa PCB li qalang ho senyeha ho ke keng ha etsolloa ke lik'hemik'hale. Moeli ona o bohlokoa bakeng sa ho utloisisa hore na thepa e khona ho mamella mekhoa e feteletseng ea tlhahiso e kang ea soldering le reflow.
• kamano: Boleng bo phahameng ba Td bo netefatsa hore thepa e lula e tsitsitse nakong ea ts'ebetso e phahameng ea mocheso le ts'ebetso ea nako e telele libakeng tse hlokang mocheso, joalo ka mehala ea puisano, likoloi le lisebelisoa tsa elektronike tsa sefofane.
• Tloaelehileng Range: Litekanyetso tsa Td tsa lisebelisoa tsa PCB hangata li tloha ho 300 ° C ho isa ho 350 ° C kapa ho feta, ho latela sebopeho sa thepa.

Tg (Glass Transition Temperature)

• Tlhaloso: Tg e bolela mocheso oo thepa e fetohang ho tloha boemong bo thata, ba khalase ho ea boemong bo bonolo haholoanyane, bo nang le rabara. Ho fapana le Td, ena ke phetoho ea 'mele e amang thepa ea mochini ea PCB.
• kamano: Tg e bohlokoa bakeng sa ho khetholla boitšoaro ba mochine oa thepa nakong ea ts'ebetso e tloaelehileng. Ho feta Tg nakong ea tšebeliso e tloaelehileng ho ka baka deformation, warping, kapa cracking ea PCB.
• Tloaelehileng Range: Litekanyetso tsa Tg ka kakaretso li tloha ho 130 ° C ho ea ho 180 ° C bakeng sa lisebelisoa tse tloaelehileng tsa PCB, tse nang le lisebelisoa tse phahameng tse fanang ka litekanyetso tsa Tg ka holimo ho 200 ° C.

Liphapang tse ka Sehloohong Pakeng tsa Td le Tg

• Sebopeho sa Phetoho:
  • Td: E emela ho senyeha ha lik'hemik'hale tsa thepa.
  • Tg: E emetse phetoho ea 'mele ho tloha boemong bo thata ho ea boemong bo tenyetsehang.
• Mehopolo ea Mocheso:
  • Td: E bontša ho hanyetsa ha thepa mocheso o feteletseng nakong ea tlhahiso.
  • Tg: E bonahatsa bokhoni ba thepa ea ho boloka botšepehi nakong ea ts'ebeliso ea kamehla.
• Tšusumetso ho Tlhahiso ea Boto ea Potoloho:
  • Td: E bohlokoa bakeng sa lits'ebetso tsa mocheso o phahameng joalo ka solder le reflow.
  • Tg: Bohlokoa bakeng sa ho netefatsa hore PCB e boloka matla a eona a mochini nakong ea ts'ebeliso e tloaelehileng ea lisebelisoa tsa elektroniki.

fihlela qeto e

Tlhahisong ea boto ea potoloho, ho utloisisa le ho ntlafatsa boleng ba Td ke ntho ea bohlokoa bakeng sa ho theha li-PCB tse tšepahalang, tse sebetsang hantle tse ka mamellang likhatello tsa mocheso oa tlhahiso le litlhoko tsa ts'ebetso ea lisebelisoa tsa elektroniki tsa sejoale-joale. Ka ho khetha thepa e nang le boleng bo phahameng ba Td le ho laola ka hloko ts'ebetso ea tlhahiso, baenjiniere ba ka netefatsa ho tšoarella, ts'ebetso le bophelo bo bolelele ba lihlahisoa tsa elektroniki ho pholletsa le liindasteri tse fapaneng.

Ho kenyelletsa tsebo ea Td le Tg ts'ebetsong ea moralo ho lumella hore ho thehoe liboto tsa potoloho tse sa mamelle feela maemo a feteletseng a tlhahiso empa hape li tsoela pele ho sebetsa ka botšepehi libakeng tsa tsona tsa kopo. Tekanyetso ena e hlokolosi ea menahano ea mocheso ke senotlolo sa ho fana ka lisebelisoa tsa elektroniki tsa boleng bo holimo tse fihlelang litlhoko tse ntseng li hola tsa liindasteri tse tsoetseng pele.