Fr-4 kufuneka yaziwe phambi kwebhodi ye-PCB

Fr4 kufuneka yaziwe phambi kwebhodi ye-PCB

Xa sibeka i-odolo kumzi-mveliso webhodi ye-PCB, kuhlala kukho uhlobo lwebhodi ye-Fr-4 ukuze ukhethe kuyo. Okwangoku, zintathu iintlobo zeBhodi: Fr-4, iBhodi yeAluminifuna, kunye neBhodi yeThembari yeThembari.

1. Fr-4, ibhaliwe njengoFr4, zombini igama kunye nenqanaba eliqhelekileyo

Izixhobo ze-organic zisetyenziselwa ukwenza i-PCBs ziqukethe izinto ezi-3: i-resin, izinto zokuqinisekisa, kunye ne-foil yobhedu.

I-FR kumgangatho wokuhlelwa kwe-NEMA uthetha idangatye (idangatye-intlawulo) okanye ukungavisisani komlilo (oko kukuthi, iibhodi ze-FR, kunye nenombolo "4 "Kuthetha ukuba izinto ezibonakalayo zahlula kwezinye izinto zenqanaba elifanayo, 4 zithetha ukuba i-resin i-epoxy, iBakala loNyanzelelo yiBanga leFlashe, kunye neBanga lokuThintela iFlethe yi-UL94 v-0. Iqondo ledangatye elihlawulelekileyo leFr-1, Dr-2, kwaye Fr-3 ngaba i-UL 94V-1, kunye neMisa kunye nokuFundisa izixhobo ezisetyenzisiweyo zahlukile.

2. Isalathiso sentsebenzo ye-FR-4
I-Fr-4 ye-Fr-4 yinkqubo ye-epoxy resin, ke ixesha elide, ixabiso le-TG yeyona ndawo isetyenziswayo esetyenziselwa ukuhlelwa kwe-Fr-4 subses, kwaye yenye yezona zinto zibalulekileyo kwi-IPC-4101.

I-GG GRRY I-TG

Ixabiso le-TG lenkqubo ye-resin libhekisa kwindawo yotshintsho lwamaqondo obushushu apho utshintsho lwezinto ezikhoyo ukusuka kwi-tigid ye-tigid okanye "iglasi" kwimo ebonakalayo okanye ethambileyo. Olu tshintsho lwe-thermodynamic luhlala luguquka kakhulu njengoko i-resin ingasebenzi. Oko kukuthi, xa umbandela ushushu kwiqondo lobushushu oluqhelekileyo kwiqondo lokushisa ngaphezulu kwexabiso le-TG, kwaye emva koko upholile ngezantsi kwexabiso le-TG, inokutshintsha ibuyele kwibala le-TGID ngepropathi efanayo njengangaphambili. Nangona kunjalo, xa i-pit ifudumele amaqondo obushushu ngaphezulu kwe-TG yayo, iNguqulelo yeSigaba esingenakuphikiswa inokwenzeka. Iziphumo zala maqondo obushushu zininzi ekufuneka zenziwe ngohlobo lwezinto kunye nokungalunganga kwe-shirm ye-resin.

Ngokubanzi, ukuphakama kwe-TG ye-subtate, okuphakamileyo ukuthembeka kwento leyo. Ukuba inkqubo yokuthengiswa esimahla yamkelwa, iqondo lokungalunganga le-thermal (TD) yezinto ezisesikweni kufuneka ithathelwe ingqalelo.

Ezinye izalatho zomsebenzi ezibalulekileyo zibandakanya ukungaphumeleli kwe-thermal (CTE), ukufunwa kwamanzi, iipropathi zokubelethiswa kwezinto, kunye nokusetyenziswa kwexesha lokuzivisala kwe-T260 kunye ne-T268 yeemvavanyo. [1]

3. Ukwahluka kweFr-4

Ilaphu le-fiber fiber lisetyenziswa njengento yokuqinisa, inkqubo ye-resin yi-Epoxy Retin kunye nezinto ezisesikweni kunye neflethi yokuhlawula ilangatye le-Ul 94v-0 yiFr-4. Ngaba ikhona into ekhethekileyo phakathi kweklasi enkulu yezinto?

Yahlula ngokwexabiso le-TG


Owona mahluko ubonakalayo phakathi kwezinto ze-Fr-4 lixabiso le-TG. Ngokweqondo lobushushu le-TG, iimakhishithi ezi-4 zahlulahlulwe zangama-TG ephantsi, i-TG ephakathi ne-TG kunye ne-TG ephezulu.

Kumzi-mveliso, uFr-4 nge-TG malunga ne-135 ° C ihlala ihlelwe njengephepha le-TG eliphantsi; Fr-4 nge-TG malunga ne-150 ° C yiphepha le-TG eliphakathi; Kwaye fr-4 nge-TG malunga ne-170 ° C ihlelwe njengephepha le-TG ephezulu.

Ukuba kukho amaxesha amaninzi okucinezela ngexesha lokuqhutywa kwe-PCB, okanye inani le-PCB likhulu (ngaphezulu kwe-14 leendlela), okanye ubushushu obungekho mthethweni), okanye amaqondo obugqino aphezulu (okanye amaqondo obushushu aphezulu (ngaphezulu kwe-100 ° C) , okanye uxinzelelo lwe-wilding inkulu (njengokuthengiswa kwamaza), kufuneka ukhethe iplate ephezulu ye-TG.

Yahlula ngokokulahleka.

UFr-4 unokwahlulwa ukuba:

Iplate yelahleko eqhelekileyo (DF≥0.02)
Iplate yelahleko ephakathi (0.01 <DF <0.02)
IPlayithi yelahleko esezantsi (0.005 <DF <0.01)
Iphepha lokulahleka kwe-ultra-eliphantsi (DF <0.005)

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