Mefuta ea Litšepe bakeng sa Likarolo tsa Elektronike le Mekhoa ea Tsona ea Tlhahiso
Di-elektronike tsa sejoale-joale ha di hlaloswe feela ka moralo wa potoloho le boqhetseke ba di-chip, empa hape le ka kgetho ya tshepe e nepahetseng bakeng sa karolo ka nngwe. Ditshepe di phetha karolo ya bohlokwa e le di-conductor tsa motlakase, thepa ya ho ikopanya, dikoahelo tse thibelang ho bola, di-lod tsa dikarolo, thepa ya ho kopanya, esita le thepa ya sebopeho bakeng sa di-heat sinks le tšireletseho ya electromagnetic. Mofuta o mong le o mong wa tshepe o fana ka dibopeho tse fapaneng—ho tsamaisa motlakase, ho hanyetsa ho bola, matla a mechini, ntlha ya ho qhibiliha, le bonolo ba tlhahiso—kahoo kgetho e tlameha ho lokisetswa ditlhoko tsa tshebediso. Sengoloa sena se bua ka mefuta ya tshepe e sebediswang hangata dikarolong tsa elektroniki le mekgwa ya tsona ya tlhahiso indastering.
1. Koporo (Koporo/Cu): Mokokotlo oa Bakhanni
Koporo ke tšepe e hlahelletseng ka ho fetisisa disebedisweng tsa elektroniki ka lebaka la ho tsamaisa motlakase ho hoholo haholo, ho feto-fetoha ha yona habonolo, le theko e bapiswang le disete tsa bohlokwa. Koporo e sebediswa dibotong tsa potoloho tse hatisitsweng (di-PCB), dikheibole, di-winding tsa motor/transformer, di-busbars le dihokelo.
Mokhoa oa tlhahiso:
– Ho hlwekisa le ho hlwekisa ka motlakase: Majwe a koporo a hlwekisitswe ho fihlela bohloeki bo phahameng (hangata >99,9%). Bakeng sa ditshebediso tsa elektroniki, bohloeki bo bohlokwa ho netefatsa khanyetso e tlase.
– Ho phutholla le ho annealing: Koporo e phuthoa ka maqephe a masesaane (li-foil) bakeng sa li-PCB, ebe e annealing (e futhumatsoa le ho pholisoa ka tsela e laoloang) ho e etsa hore e be bonolo haholoanyane le ho sebetsanoa habonolo.
– Ho penta ka motlakase ka koporo: Ts'ebetsong ea tlhahiso ea PCB, litsela tsa koporo li ka "holisoa" ka ho penta ka motlakase libakeng tse itseng ho eketsa botenya ba tsela.
2. Aluminium (Al): E bobebe, e theko e tlase, 'me e ka tšeptjoa bakeng sa mocheso
Aluminium e sebediswa haholo bakeng sa disinki tsa mocheso, dikheishene, diforeimi tsa sesebediswa, le di-capacitor tsa electrolytic (jwalo ka foil ya anode). Le hoja ho tsamaisa motlakase ha yona ho le tlase ho feta ha koporo, aluminium e ipabola ka boima bo bobebe, ho hanyetsa mafome (ka lebaka la lera la yona la tlhaho la oxide), le ho tsamaisa mocheso hantle.
Mokhoa oa tlhahiso:
– Ho lahla le ho ntsha die: Disinki tsa mocheso hangata di etswa ka ho ntsha die (ho sutumelletsa aluminium ka hara die) ho etsa mapheo a phodisang, kapa ho lahla die bakeng sa dibopeho tse rarahaneng.
– Ho tlotsa oli: Ts'ebetso ea lik'hemik'hale tsa motlakase e etsang lera le teteaneng le tsitsitseng haholoanyane la oxide. Ho tlotsa oli ho eketsa ho hanyetsa mafome 'me ho ka ntlafatsa litšobotsi tsa ho ntša mocheso (ho latela qetello).
– Ho hlaba (bakeng sa foil ea capacitor): Bokaholimo ba aluminium bo hlaba ho eketsa sebaka sa bokaholimo, ka hona ho eketsa bokhoni ka bongata bo bonyenyane.
3. Tin (Sn) le Solder Alloy: Lihokelo Pakeng tsa Likarolo
Tin ke motsoako o ka sehloohong ho solder. Solder e hokahanya likarolo le PCB ha e ntse e netefatsa ho kopana ha motlakase le matla a mechini. Kajeno, liindasteri tse ngata li sebelisa li-solder tse se nang loto tse kang SAC (Tin-Silver-Copper), tse kang Sn-Ag-Cu.
Mokhoa oa tlhahiso:
– Ho kopanya (ho etsa metsoako e kopantsoeng): Tin e kopanngoa le silevera le koporo ka metsoako e itseng ho fumana ntlha e loketseng ea ho qhibiliha le matla a manonyeletso.
– Ho kopanya hape: Ho kopanya ha solder ho hatisoa (ho hatisa ka stensele) holim'a PCB pad, ebe ho futhumatsoa ka ontong e kopanyang hape e le hore solder e qhibilihe 'me e thehe khokahano.
– Ho kopanya maqhubu: Bakeng sa likarolo tse phunyeletsang, boto e fetisetsoa holim'a leqhubu la ho kopanya maqhubu a qhibilihisitsoeng e le hore maoto a likarolo a kopanyetsoe.
4. Khauta (Au): Ho ikopanya le Premium Anti-Crosion
Khauta e sebelisoa lihokelong, li-contact pad, lithapo tsa bonding, le liphahlo tsa ntlha ea ho kopana ka lebaka la khanyetso ea eona e phahameng ea oxidation le conductivity e phahameng. Khauta e netefatsa likhokahano tse tsitsitseng esita le ha e sebelisoa khafetsa le libakeng tse mongobo.
Mokhoa oa tlhahiso:
– Ho maneha ka electroplating ya kgauta: Lera le lesesaane la kgauta le tlotswa hodima bokahodimo ba sehokelo kapa pad. Botenya ba yona bo ntlafaditswe bakeng sa ho hanyetsa ho tsofala ntle le ditjeo tse ngata.
– Ho kopanya terata: Indastering ea semiconductor, terata ea khauta (kapa mekhoa e meng) e sebelisoa ho hokahanya die le leadframe ka mokhoa oa ho kopanya oa thermosonic/ultrasonic.
– ENIG ho PCB: Qetello e tsebahalang ho PCB ke ENIG (Khauta ea ho Immersion ea Nickel e se nang motlakase): nickel e manehiloe ntle le motlakase, ebe e be lera le lesesaane la khauta e le lera le ka ntle.
5. Silevera (Ag): Khokahano e Phahameng ka ho Fetisisa bakeng sa Litsela tse Ikhethang
Silevera e na le motlakase o phahameng ka ho fetisisa har'a litšepe tse tloaelehileng, e leng se etsang hore e sebelisoe lits'ebetsong tse ikhethileng tse kang li-conductor tse sebetsang hantle, li-conductor pastes, li-button membranes le lihokelo tse ling. Bothata ke hore silevera e ka fifala ka lebaka la karabelo ea eona le sebabole.
Mokhoa oa tlhahiso:
– Peista ya silevera (kgatiso ya skrine): Dipotolohong tse tenyetsehang kapa lera, paterone ya di-conductor tsa silevera e hatiswa ho sebediswa mokgwa o ikgethang wa kgatiso ya skrine, ebe e omiswa/e phekolwa.
– Ho maneha ka silevera: Ho maneha ka motlakase ho etswa hodima dihokelo tse itseng ho fokotsa ho hanyetsa ho kopana, haholoholo maqhubung a phahameng.
6. Nikele (Ni): Ho Koahela ka Thibelo le ho Hanela ho Tshwara
Hangata nikeli e sebetsa e le lera la thibelo ho thibela ho hasana ha tšepe le ho ntlafatsa ho hanyetsa ho tsofala ha lihokelo. Ha ho phethoa PCB, nikeli e sebelisoa pele ho khauta (mohlala, ENIG) hobane e fana ka matla le botsitso ho pad.
Mokhoa oa tlhahiso:
– Ho penta ka nickel ntle le motlakase: Ho hlahisa lera la nickel le lekanang ntle le motlakase, le loketseng li-geometri tse rarahaneng.
– Nikel electroplating: E sebediswa bakeng sa dikobo tse hlokang taolo e itseng ya botenya.
7. Palladium (Pd) le Platinum (Pt): E tsitsitseng bakeng sa ho kopana le ho koahela
Palladium e sebelisoa lihokelong tse ling 'me e le mokhoa o mong oa ho sebelisa khauta ho ntlafatsa ho hanyetsa ho tsofala ka litšenyehelo tse tlase ka linako tse ling. Platinum ha e sebelisoe hangata ka lebaka la litšenyehelo tsa eona tse phahameng, empa ho hanyetsa ha eona lik'hemik'hale ho phahameng ho e etsa hore e lokele lits'ebetso tse itseng tsa sensor.
Mokhoa oa tlhahiso:
– Seaparo se kgethilweng: Hangata Pd e manehwa ka tsela e kgethilweng dibakeng tsa ho kopana feela bakeng sa ho boloka ditjeo.
– Ho etsoa ha li-electrode tsa sensor: Pt e ka etsoa hore e be li-electrode tse tšesaane ka ho beha lithographic le ho etsa lipaterone (haholo-holo li-sensor le lisebelisoa tse nyane).
8. Tšepe, Tšepe le Metswako e Kopaneng: Matla a Mechini le Tšireletso
Tšepe le litšepe tse kopantsoeng li sebelisoa bakeng sa liforeimi, likurufu, chassis le matlo a hlokang matla. Ho feta moo, litšepe tse ling tsa lakane li ka sebelisoa e le tšireletso ea EMI.
Mokhoa oa tlhahiso:
– Ho hata le ho kobeha: Maqephe a tshepe a sehwa (a tlangwa ka setempe) mme a kobeha ho hlahisa masakaneng, dikobo le diforeimi.
– Seaparo se thibelang mafome: Tšepe hangata e manehuoa ka zinki (galvanizing), nikeli, kapa pente/phofo ho e etsa hore e se ke ea rusa mafome.
– Ho thehoa ha makotikoti a thebe: Lithebe tsa EMI ho li-PCB hangata li etsoa ka maqephe a tšesaane a tšepe a hatisitsoeng, ebe a khomaretsoa ka solder kapa li-clips.
9. Leadframe: Li-Alloy tsa Koporo le Koporo bakeng sa ho Paka IC
Liphuthelong tse itseng tsa IC, liforeimi tsa loto li entsoe ka koporo kapa metsoako ea eona ka lebaka la ho tsamaisa ha tsona hantle le bonolo ba ho bopa ka nepo.
Mokhoa oa tlhahiso:
– Ho hatakela ka mokhoa o tsoelang pele: Tšepe ea lakane e sebetsoa ka mekhahlelo ho ea ho li-dies ho etsa maoto a IC.
– Ho betla ka lik'hemik'hale: Mokhoa o mong bakeng sa lintlha tse ntle, ho sebelisa lik'hemik'hale ho "ngola" paterone ea leadframe.
– Plating (Sn, Ni, Ag, Au): Foreimi ea lead e koahetsoe ho ntlafatsa bokhoni ba ho solder le ho hanyetsa mafome.
10. Mekhoa ea Khetho ea Litšepe tsa Elektroniki
Khetho ea tšepe ha se feela taba ea ho tsamaisa motlakase. Baqapi ba boetse ba nahana ka:
1. Ho tsamaisa motlakase le ho hanyetsa ho kopana (mohlala, koporo, silevera, khauta).
2. Ho hanyetsa ho qhibilihisoa ha oli/ho bola (khauta e phahame haholo, nikeli ke thibelo).
3. Matla a mechini le ho tsofala (tšepe, nikeli, palladium).
4. Tshebetso ya mocheso (aluminium bakeng sa sinki ya mocheso).
5. Ho tsamaellana ha lits'ebetso tsa tlhahiso tse kang ho kopanya hape, ho plating le ho hatakela.
6. Litšenyehelo le ho fumaneha ha thepa le botsitso ba ketane ea phepelo.
Ho koala
Litšepe ke "motheo oa 'mele" o nolofalletsang matšoao a motlakase ho phalla, ho futhumatsa ho fela, le likhokahano ho tšoarella lisebelisoa tsa elektroniki. Koporo e laola tsela ea ho tsamaisa motlakase, aluminium e ipabola taolong ea mocheso, thini le lialloy tsa eona li tšoara likarolo hammoho ka ho li kopanya, ha khauta, silevera, nickel le palladium li netefatsa boleng ba ho kopana le ho hanyetsa mafome. Ka mor'a litšepe tsena, mekhoa ea tlhahiso e kang ho phutholla, ho hatakela, ho ntša, ho fata, le ho kopanya hape ke senotlolo sa tlhahiso ea boleng bo holimo ea likarolo tsa elektroniki. Ka ho utloisisa litšobotsi tsa litšepe le mekhoa ea tsona ea tlhahiso, re ka rala lisebelisoa tse tšepahalang haholoanyane, tse sebetsang hantle le tse tšoarellang.
Haeba o rata, nka fetola sengoloa sena ho latela moelelo o itseng—mohlala, ho tsepamisa maikutlo indastering ea PCB, connector, kapa SMT assembly—mme ka eketsa bibliography le mehlodi ea tekheniki.
