I-PCB Ephakathi Tg vs. High Tg: Ukuqonda Umehluko

Ama-PCBA ayizingxenye ezibalulekile ze-elekthronikhi zanamuhla, asebenza njengomgogodla wamadivayisi kagesi. Lawa ma-assemblies akhiwe ngezinto ezahlukahlukene, futhi ukusebenza kwawo kanye nokuthembeka kwawo kuthinteka kakhulu ukushintshashintsha kwezinga lokushisa. Lesi sihloko sigxila emthonjeni ojulile wokushintsha kwezinga lokushisa kuma-PCBA, sixoxa ngezakhiwo zokushisa zezinto, umqondo we-Glass Transition Temperature (Tg), kanye nezigaba ezahlukene ze-PCB Tg. Ngaphezu kwalokho, sihlola ukusetshenziswa kanye nezinzuzo zama-PCB aphezulu e-Tg futhi sikhanyise ukubaluleka kwezinto eziphakathi kwe-Tg ezimweni ezithile zokusetshenziswa. Okokugcina, sihlola amasu ahlukahlukene okuhlaziya ukushisa okuhlola izinto ze-PCB kanye nezinzuzo zazo.

Ukushintshashintsha kwezinga lokushisa kungaba nomthelela omkhulu kukhwalithi, ukwethembeka, nokusebenza kwama-PCBA. Njengoba izinga lokushisa likhuphuka, izinto zivame ukwanda. Kodwa-ke, ama-PCB ngokuvamile akhiwe ngezinto ezinama-coefficients ahlukene we-thermal expansion (CTE), okuholela ekucindezelekeni kwemishini. Lokhu kucindezeleka kungabangela ukwakheka kwemifantu emincane engabonakali ngesikhathi sokuhlolwa kukagesi, njengokuhlola okufushane/okuvulekile, okwenziwa phakathi nezigaba zokugcina zokukhiqiza. Lawa ma-micro-crack angase aholele ekuhlulekeni okubonakala ngemva kwenqubo yokuhlanganisa, okungase kubangele ukungasebenzi kahle kwemikhiqizo ehlukahlukene.

Ukuqonda izinga lokushisa le-Glass Transition (Tg)

Ngo-2002, kwethulwa iziqondiso Zokukhawulelwa Kwezinto Eziyingozi (RoHS), okugunyaza ukuthi kusetshenziswe ama-alloys angenawo umthofu ukuze afakwe kwi-soldering emihlanganweni ye-elekthronikhi. Ukususwa komthofu kuma-alloys e-solder kubangele izinga lokushisa eliphakeme lokuncibilika, okuveza ama-PCB ekushiseni okukhulu phakathi nenqubo yokudayiswa, okuhlanganisa nokugawula nokugeleza kabusha kwe-solder. Ngakho-ke, ukukhetha ama-PCB anezici zomshini ezifanele, ikakhulukazi lawo anezinga lokushisa elifanele le-Glass Transition (Tg), kwabaluleka kakhulu ukuze kuqinisekiswe izinqubo zokuhlanganisa ezinokwethenjelwa.

I-Tg iwumshini oyisisekelo obonisa izinga lokushisa lapho into ethile ishintsha isuka esimweni esiqinile, esiqinile, nesicwebezelayo siye esimweni esinenjoloba eyengeziwe. Uma i-Tg idlulwa, izinto ezisetshenziswayo azincibiliki kodwa ziba nezinguquko zesakhiwo, zibe injoloba ngokwemvelo. Ukulinganisa i-Tg ngokunemba kuyinselele ngenxa yezici ezihlukahlukene, okuhlanganisa ukwakheka kwamangqamuzana omsebenzi. Izinto ezisetshenziswayo ezihlukene zinamanani ahlukile we-Tg, ngisho noma izici zazo zobuchwepheshe zihlukile. Ngokuphawulekayo, i-viscosity yempahla iyanda lapho ishiselwa futhi ingaholela ekwephukeni noma ekuqhekekeni ngemva kokupholisa.

Ukubaluleka kwe-PCB Tg

Kumongo wama-PCB, i-Tg imele izinga lokushisa lapho into ye-polymer ishintsha isuka endaweni eyingilazi futhi eqinile iye esimweni esithambile noma esithambile. Lolu shintsho lwe-thermodynamic lungahlehliswa inqobo nje uma impahla ye-polymer ingehliki. I-Tg ifaneleka ikakhulukazi ngoba izakhi ze-organic ezintweni eziyisisekelo, njengama-hydrocarbon nama-binder, ngokuvamile zinokuzinza okuphansi kwezinga lokushisa uma kuqhathaniswa nezakhi ze-inorganic zezinto eziyinhlanganisela.

Imizamo yenziwe yokuthuthukisa izakhiwo ezishisayo zama-polymer ukuze azenze zifaneleke njengezibophezelo kuma-PCB. Kodwa-ke, lezi zakhiwo zisasele ngemuva kokuzinza okushisayo kwe-foil yensimbi, imicu yengilazi eqinisayo, nezigcwalisi ze-ceramic. Ngenxa yalokho, lapho kwethulwa ubuchwepheshe bokuthengisa obungenamthofu, ngisho nokwenyuka okuncane kwezinga lokushisa lokudayiswa kwaba nomthelela omkhulu ekuzinzeni kwezinga lokushisa lamapholymer ahlanganisayo e-PCB.

Amakilasi e-PCB Tg

I-PCB Tg ihlukaniswe yaba amakilasi amaningana ngokuya ngebanga lokushisa eliwahlanganisayo:

1. I-High Tg PCB: Ama-PCB aphezulu e-Tg aziwa ngokusebenza kwawo okushisayo okuphakeme. Nakuba kuvame ukukholelwa ukuthi amanani e-Tg aphezulu ahlala engcono, ubudlelwano buyahlukahluka kakhulu. Amanani e-Tg aphezulu abambezela ukuqala kokunwetshwa okushisayo okubalulekile kwesistimu ye-polymer ethile. Kodwa-ke, impatho yokunwebeka iyonke isengahluka phakathi kwezinto. Izinto ezinamazinga okushisa engilazi aphansi zingabonisa ukunwetshwa kwenetha okuphansi uma kuqhathaniswa nezinto zokwakha ezinamavelu e-Tg aphezulu.
2. I-Medium Tg PCB: I-Medium Tg PCB ibonakala ngamavelu e-Tg amaphakathi. Banikeza ibhalansi phakathi kokuphumelela kwezindleko nokusebenza okushisayo. Izinto ze-Medium Tg zivame ukuthola izinhlelo zokusebenza lapho ama-Tg PCB aphezulu engabalulekile kodwa kusadingeka ukuzinza okungcono kokushisa uma kuqhathaniswa nama-PCB ajwayelekile.
3. I-Low Tg PCB: I-Low Tg PCBs inamanani e-Tg aphansi futhi asetshenziswa ezinhlelweni lapho izindleko nokusebenza okushisayo kuhambisana nezakhiwo zalezi zinto.

Izicelo zama-PCB aphezulu we-Tg

Ama-PCB aphezulu e-Tg athola izinhlelo zokusebenza ezimbonini nasezimeni ezahlukahlukene lapho kufanele khona ukuzinza nokuthembeka okukhethekile:

1. Izisetshenziswa Zokuxhumana: Imishini yenethiwekhi, i-fiber optic zokuxhumana, neziteshi ezingenazintambo zidinga ama-Tg PCB aphezulu ngenxa yesidingo sazo sokuthembeka okuhle kakhulu kukagesi nokusebenza ezindaweni ezinezinga eliphezulu kanye nezinga lokushisa eliphezulu.
2. Imishini Yokulawula Izimboni: Ama-PCB aphezulu e-Tg asetshenziswa kumarobhothi, kumasistimu ezishintshayo, nasezinsizeni zokulawula zezimboni ezisebenza endaweni enomswakama ophezulu, izinga lokushisa eliphezulu, nezimo ezinyakazayo, ezidinga amandla aqinile emishini nokuzinza okushisayo.
3. I-Automotive Electronics: Izinzwa, amakhompyutha asebhodini, amadeshibhodi, nezinhlelo ezibalulekile ezimotweni ziyazuza ekusebenziseni ama-Tg PCB aphezulu. Izinto zangaphakathi zezimoto zivame ukuba nokuguquguquka okukhulu kwezinga lokushisa, okudinga ama-PCB angakwazi ukumelana nengcindezi ephezulu yokushisa.
4. I-Aerospace: Imboni ye-aerospace idinga izinto zikagesi ezinokumelana nezinga lokushisa eliphezulu nokuthembeka. Ama-PCB aphezulu e-Tg FR4 asetshenziswa kakhulu kumasathelayithi, ezindizeni, nasezinsizeni zokuzulazula ukuze abekezelele ukushintsha kwezinga lokushisa okudlulele nezimo zokusebenza ezinzima.
5. Amadivayisi Ezokwelapha: Imishini yezokwelapha idinga amandla okusebenza ngaphansi kwezimo ezishisa kakhulu zokubulala amagciwane nezimo zokuvala inzalo. Ama-PCB aphezulu e-Tg adlala indima ebalulekile ekulawuleni imicibisholo, izinhlelo ze-radar, amathuluzi ahlakaniphile, ezokuxhumana kwezempi, nezinye izinhlelo zokusebenza zemishini yezokwelapha ehlukahlukene.

Izinzuzo zama-PCB aphezulu we-Tg

Ama-PCB aphezulu e-Tg anikeza izinzuzo ezimbalwa ngenxa yezakhiwo zawo ezishisayo ezihlukile:

1. Ukuqina Kwezinga Lokushisa Okuphezulu: Ama-PCB aphezulu e-Tg abonisa ukumelana okuhle kakhulu nokushisa okuphezulu kakhulu ngenkathi egcina ubuqotho besakhiwo. Aziwohloki noma azijikijeli lapho zivezwe ekushiseni, ziqinisekisa ukusebenza okuqhubekayo ngaphansi kwengcindezi eshisa kakhulu.
2. Amandla Amakhulu Emishini: Lawa ma-PCB ayakwazi ukumelana ngokwemvelo futhi ayakwazi ukumelana namazinga aphezulu engcindezi nengcindezi. Ngesendlalelo ngasinye esingeziwe, ukuqina kwazo nokusebenza komshini kuyathuthuka.
3. Ukuthembeka Okuthuthukisiwe: Ama-PCB aphezulu e-Tg athembeke kakhulu kunama-PCB ajwayelekile, aletha ngokungaguquki ukusebenza kahle kukagesi ngisho nasezimeni ezinzima zemvelo ezinamazinga okushisa aphakeme.
4. Ukuminyana Okuphezulu kwamandla: Ama-PCB endabuko alwela ukusebenzisa amandla aphezulu ngenxa yokushisa okukhiqizwa izingxenye. Ama-Tg PCB aphezulu angakwazi ukuqeda ukushisa ngempumelelo, okuvumela ukubekwa kwezingxenye ezengeziwe ebhodini ngaphandle kokukhathazeka ngokushisisa ngokweqile.

Izakhiwo ze-High Tg PCBs

Izinto ezisetshenziswayo ze-Tg PCB eziphezulu zinohlu lwezindawo ezinenzuzo ezifaka isandla ekufanelekeni kwazo kwezicelo ezifunayo:

1. Ukunwetshwa Kokushisa Okuphansi: Lezi zinto zikhombisa ukunwebeka okuphansi kokushisa, ikakhulukazi endaweni ephambanayo, okubalulekile ekugcineni ukuqina kwe-dimensional, ikakhulukazi kumabhodi we-High-Density Interconnect (HDI).
2. Ukumelana Nokushisa Okuphezulu: Ama-PCB aphezulu e-Tg aklanyelwe ukumelana nezinga lokushisa eliphezulu, ukuqinisekisa ukuthi asebenza ngokwethembeka ngisho nasezimweni ezishisayo kakhulu.
3. Izakhiwo Ezinhle Kakhulu Zemishini: Zinikeza amandla amahle kakhulu emishini, zithuthukisa ikhono lazo lokumelana nokucindezeleka komshini nokugcina ukusebenza.
4. I-High Plated Through-Hole Reliability: Ukuthembeka kwe-plated ngokusebenzisa izimbobo (PTHs) kuthuthukiswa kakhulu kuma-Tg PCB aphezulu, kunciphisa ingozi yokwehluleka ngenxa yokucindezeleka okushisayo.
5. I-High Thermal Stress Resistance: Lezi zinto zinokumelana okuphezulu nengcindezi yokushisa, okuzenza zifanelekele izinhlelo zokusebenza ezingaphansi kokuguquguquka okusheshayo kwezinga lokushisa.

Uwadinga Nini Ama-PCB aphezulu we-Tg?

Isidingo sama-Tg PCB aphezulu sivela lapho:

1. Umthwalo oshisayo ku-PCB yakho ungaphakathi kuka-25℃ wenani le-Tg.
2. Umkhiqizo wakho usebenza ngokungashintshi emazingeni okushisa angu-130℃ noma ngaphezulu.
3. Ushintshela kuma-PCB athobela i-RoHS, avame ukudinga izinto eziphakeme ze-Tg.

Ama-PCB aphezulu e-Tg abaluleke kakhulu ezinqubweni zokunamathisela ezingenamthofu, lapho ukuvama kwezicelo ezishisa kakhulu kudinga izinto ezikwazi ukumelana nokucindezeleka okushisayo.

I-Middle Tg PCB Material

Izinto ze-Middle Tg PCB zithatha isikhala esibalulekile endaweni yamabhodi esekethe aphrintiwe, zinikeza izinhlelo zokusebenza ezithile ezidinga ibhalansi yezakhiwo. Lezi zinto zibonakala ngamazinga okushisa aphakathi kwengilazi futhi zinikeza izinzuzo ezihlukile:

1. Impahla Ye-Anti-CAF: Izinto ze-Middle Tg PCB zimelana ne-Conductive Anodic Filament (CAF), zizenze zifanelekele ukwenziwa kwe-PCB lapho i-CAF ikhathaza khona.
2. Ilungele Imvelo: Lezi zinto aziqukethe i-phosphorus ne-halogen, okunomthelela ekuphepheni kwazo kwemvelo.
3. I-UL-94 Ukuvutha: Izinto ze-Tg PCB Ephakathi zinamathela kumazinga okuvutha e-UL-94 V-0, zinikeza imininingwane ngokuziphatha kwazo kokuvutha.
4. Ukusebenza Okushisayo Okuhle Kakhulu: Izinto ze-Middle Tg zibonisa izakhiwo ezishisayo ezisezingeni eliphezulu, ezizenza zilungele ukwakha amabhodi esekethe aqinile nezinye izinhlelo zokusebenza ezisebenza kahle kakhulu.

Izinhlelo zokusebenza ze-Middle Tg PCBs

I-Middle Tg PCBs isetshenziswa ezinhlelweni ezahlukahlukene, kufaka phakathi:

1. I-Consumer Electronics: Ama-substrates anohlangothi olulodwa anezinto ezimaphakathi ze-Tg avame ukusetshenziswa kumadivayisi kagesi abathengi njengamafoni, amakhibhodi, ama-consoles wegeyimu, nezitiriyo.
2. I-Silver Through-Hole Substrates: I-Middle Tg PCBs ifaneleka izinhlelo zokusebenza lapho ukucwebezela kwethusi kungakwazi ukwakha izimbobo, futhi izimbobo zidalwa ngokuzigcwalisa ngesiliva.

Amasu okuhlaziya okushisayo kwe-PCB Middle Tg

Ukuhlola ukusebenza okushisayo kwezinto ze-PCB kubalulekile kubakhiqizi be-elekthronikhi. Amasu amaningana okuhlaziya okushisayo ayatholakala ukuhlola izinto ze-PCB, okuhlanganisa:

1. I-Thermomechanical Analysis (TMA): I-TMA ikala izinguquko ezimpahleni ezibonakalayo zento esabela ekuhlukeni kwezinga lokushisa. Ihlola izinguquko zobukhulu, ivolumu, ukuminyana, nezinye izici, isiza ukunquma izinga lokushisa lokushintsha kwengilazi (Tg) nokuzinza kobukhulu.
2. Ukuhlaziywa kwe-Thermogravimetric (TGA): I-TGA ikala izinguquko zesisindo sempahla njengoba ingaphansi kokwenyuka kwezinga lokushisa okulawulwayo. Ihlinzeka ngemininingwane yokuncipha kwesisindo nobudlelwano bezinga lokushisa, isiza ekuqondeni ukubola okushisayo nokuzinza kwempahla.
3. I-Dynamic Mechanical Analysis (DMA): I-DMA ihlola i-viscoelasticity yezinto, okuyinhlanganisela ye-viscosity nokunwebeka. Ihlola ukuthi izinto ezisetshenziswayo zinwebeka kanjani futhi zigobe kanjani lapho zingaphansi kokunyakaza nezinga lokushisa. I-DMA ibalulekile ekufundeni i-Tg kanye nezakhiwo ezishisayo.

Onjiniyela bavame ukuqinisekisa lesi sihloko kanye nokwakhiwa kwe-PCB yamanje kanye namanothi e-PCB okuguqula amandla lapho belungiselela ukwakhiwa kwe-PCB noma i-PCBA okuthembekile.

I-Middle Tg PCB Material vs. High Tg PCB Material

Amabhodi Esifunda Aphrintiwe (ama-PCB) awumgogodla wezinto zikagesi zesimanje, futhi ukukhetha okubalulekile kwe-PCB kubalulekile ekusebenzeni komkhiqizo nokuthembeka. Izinhlobo ezimbili ezivamile zezinto ze-PCB ezinezakhiwo ezishisayo ezihlukile i-Middle Tg (I-Glass Transition Temperature) kanye ne-High Tg PCBs. Kulokhu kuhlaziya okuqhathanisayo, sizohlola umehluko phakathi kwezinto ezisetshenziswayo ze-Middle Tg ne-High Tg PCB, izinhlelo zazo zokusebenza, nokuthi ungayikhetha nini enye phezu kokunye.

1. I-Glass Transition Temperature (Tg):
   • I-Middle Tg PCB Material: I-Middle Tg PCB inezinga lokushisa lokushintsha kwengilazi ngokuvamile elisukela phakathi kuka-130℃ no-150℃. Lokhu kusho ukuthi zingakwazi ukumelana namazinga okushisa amaphakathi ngaphandle kokulahlekelwa ubuqotho bazo besakhiwo.
   • I-High Tg PCB Material: Ama-PCB aphezulu e-Tg, ngakolunye uhlangothi, anezinga lokushisa elishintshayo lengilazi elingaphezu kuka-170℃. Lezi zinto zingabekezelela amazinga okushisa aphezulu kakhulu ngaphandle kokudlulela esimweni se-rubbery.
2. Ukuqina Kokushisa:
   • I-Middle Tg PCB Material: I-Middle Tg PCBs inikezela ngokuzinza okuhle kokushisayo futhi ingaphatha uhla olubanzi lwezinhlelo zokusebenza ze-elekthronikhi ezijwayelekile ngaphandle kokukhishwa. Zifanele imikhiqizo esebenza ngaphakathi kwebanga lokushisa elimaphakathi.
   • I-High Tg PCB Material: High Tg PCBs ihamba phambili ekuzinzeni kokushisa futhi ilungele izinhlelo zokusebenza ezingaphansi kwamazinga okushisa aphakeme. Bagcina ubuqotho babo besakhiwo ngisho nasezindaweni ezishisa kakhulu, okubenza bafaneleke izicelo ezifunwa kakhulu.
3. Izicelo:
   • I-Middle Tg PCB Material: I-Middle Tg PCBs ivamise ukusetshenziswa kuma-electronics abathengi, njengama-smartphone, amakhibhodi, nezinto zokusebenza zomsindo, lapho amazinga okushisa okusebenza angaphakathi kwebanga le-Tg elimaphakathi. Zifanele futhi kumadivayisi amaningi kagesi enhloso ejwayelekile.
   • I-High Tg PCB Material: I-High Tg PCBs ithola ukusetshenziswa okubanzi ezimbonini lapho ukuchayeka emazingeni okushisa aphakeme kuvame. Lokhu kubandakanya i-automotive electronics, i-aerospace, amasistimu okulawula izimboni, kanye nemishini yokuxhumana yamaza aphezulu.
4. Ukucatshangelwa kwemvelo:
   • I-Middle Tg PCB Material: Izinto ezisetshenziswayo ze-PCB ePhakathi ze-Tg ngokuvamile zihambisana nemvelo, azinayo i-phosphorus noma i-halogen. Ziyisinqumo esihle lapho imithethonqubo yezemvelo nokusimama kuyizinto eziza kuqala.
   • I-High Tg PCB Material: Izinto ze-Tg PCB eziphezulu zingaqukatha izithasiselo zokuthuthukisa izakhiwo zazo ezishisayo, ezingaba nomthelela kuphrofayela yazo yemvelo. Cabangela imithetho yemvelo lapho ukhetha izinto ze-Tg eziphezulu.
5. Izindleko:
   • I-Middle Tg PCB Material: Izinto ezisetshenziswayo ze-PCB ezimaphakathi ze-Tg ngokuvamile zingabizi kakhulu kunozakwabo be-Tg ephezulu. Lokhu kuwenza abe yinketho ekhethwayo yamaphrojekthi akhathalela ibhajethi.
   • I-High Tg PCB Material: Izinto zokwakha ze-PCB eziphezulu ze-Tg ngokuvamile zibiza kakhulu ngenxa yezakhiwo zazo ezithuthukisiwe ezishisayo. Kodwa-ke, izindleko ezingeziwe ziyathetheleleka ezinhlelweni ezidinga ukumelana nezinga lokushisa eliphezulu.
6. Izimo ezithile zokusetshenziswa:
   • I-Middle Tg PCB Material: Khetha i-Middle Tg PCB yezinhlelo zokusebenza ezingadingi ukumelana nezinga lokushisa okudlulele kodwa ezidinga ibhalansi yokusebenza kahle kwezindleko, ukuqina kwe-thermal, nokuthembeka.
   • I-High Tg PCB Material: Khetha ama-PCB aphezulu we-Tg lapho udizayina imikhiqizo ehloselwe izindawo ezinokhahlo ezinamazinga okushisa aphakeme, izimfuneko eziqinile zokuthembeka, nempilo yesevisi eyandisiwe.

Isiphetho: Ukukhetha phakathi kwezinto ezisetshenziswayo ze-Middle Tg ne-High Tg PCB kuncike ezidingweni ezithile zokushisa zohlelo lwakho lokusebenza, imikhawulo yesabelomali, nokucatshangelwa kwemvelo. Ama-PCB e-Middle Tg afanele uhla olubanzi lwamadivayisi kagesi ajwayelekile, kuyilapho ama-High Tg PCB abalulekile kuzinhlelo zokusebenza ezingaphansi kwamazinga okushisa aphezulu nezimo ezinzima. Ukukhetha izinto ezibonakalayo ngokucophelela kubalulekile ukuze uqinisekise ukusebenza kwesikhathi eside nokuthembeka kwemikhiqizo yakho ye-elekthronikhi.

Isiphetho

Ukwehluka kwezinga lokushisa kuwukucatshangelwa okubalulekile emhlabeni wama-PCBA, lapho izakhiwo ezibonakalayo, ikakhulukazi i-Glass Transition Temperature (Tg), zidlala indima ebalulekile ekuqinisekiseni ukwethembeka nokusebenza. Ama-PCB aphezulu e-Tg athola izinhlelo zokusebenza ezimbonini ezifuna ngamandla, ezinikeza ukumelana nokushisa okukhethekile, amandla emishini, nokwethembeka. Izinto ze-Middle Tg PCB zinikeza izimo ezithile zokusetshenziswa ezidinga ibhalansi yezakhiwo, okuhlanganisa ukumelana ne-Conductive Anodic Filament (CAF) kanye nobungane bemvelo. Amasu okuhlaziya okushisayo ahlinzeka ngemininingwane ebalulekile ezicini ezishisayo ze-PCB, esiza ekukhetheni izinto kanye nokwenza kahle komklamo. Ukuqonda umthelela wezinga lokushisa kuma-PCBA nokukhetha izinto ezifanele kuyizinyathelo ezibalulekile ekuqinisekiseni ubude besikhathi nokusebenza kwamadivayisi kagesi ezimeni ezihlukahlukene zokusebenza.