Ua ntej, PCB pawg thawj coj saib kub
Qhov kub tsis kam ntawm PCB cov thawj coj ntawm PCB ntau lawm txhais tau tias nyob rau hauv kev kub siab ib puag ncig, cov thawj coj yuav tsis embrithlement, tawg, deforming thiab lwm yam tshwm sim. Yog li ntawd, qhov kub tsis kam ntawm cov thawj coj yog qhov tseem ceeb heev.
Nyob rau hauv ib txwm muaj xwm txheej, qhov kub tsis kam ntawm PCB ua yog cuam tshuam los ntawm ntau cov khoom siv, cov qauv tsim khoom, qauv Circuit thiab lwm yam. Ntawm lawv, cov khoom yog qhov tseem ceeb cuam tshuam rau qhov kub tsis kam ntawm PCB pawg thawj coj saib.
Thib ob, qhov kub tsis kam ntawm cov khoom siv uas siv tau ntawm PCB board
1. Fr -4} cov khoom siv
Fr -4 Yog ib lub khob fiber ntau ntxiv txhawb cov epoxy cov khoom siv feem ntau siv hauv PCBA raug. Qhov kub tsis kam ntawm fr {1}} cov khoom siv feem ntau yog kwv yees li 130 degree c, thiab tshaj qhov kub siab no yuav ua rau muaj kev cuam tshuam lossis tsis ua raws li lub rooj tsavxwm.
Vim tias qhov zoo ntawm kev tsim khoom lag luam tsis muaj nqi, kev ua tau zoo thiab kev lag luam zoo, fr {}}} Cov ntaub ntawv kev lag luam high-} Txawm li cas los xij, rau cov ntawv thov kub siab, qhov kub tsis kam ntawm fr {3}}} cov khoom yog tsis txaus.
2. Kub kub fr {1}}} cov khoom siv
Kub kub fr -4 yog ib lub khob fiber cuam tshuam ntxiv epoxy cov khoom tshwj xeeb tsim rau qhov chaw kub. Piv nrog fr -4}}}} cov ntaub ntawv, kub siab fr -4}}}}}}}}}} Kuv tuaj yeem tiv taus kub txog li 150 qib C lossis ntau dua.
Txawm hais tias tus nqi tsim khoom ntawm qhov kub kub fr -4 yog qhov siab, yog li nws tau siv dav hauv kev lag luam hluav taws xob siab.
3. Cov Khoom Siv Polyimide
Polyimide yog ib hom kev ua tau zoo insulating cov khoom siv, nrog cov tshuaj kub zoo heev, tshuaj lom neeg tiv thaiv thiab lwm yam yam ntxwv. Nws yog ib qho zoo tshaj plaws cov ntaub ntawv kub siab tshaj plaws ntawm kev ua lag luam, uas tuaj yeem tiv thaiv kom ntau tshaj 380 degree c, thiab muaj qhov kub siab tshaj plaws nyob rau siab dua 500 degree C.
Tam sim no, polyimide cov ntaub ntawv yog siv nyob rau hauv aerospace, tub rog thiab ntsuas kub siab. Txawm hais tias cov ntaub ntawv polyimide yog kim, lawv txoj kev ntseeg tau ntawm cov khoom kub tsis tau hloov los ntawm lwm cov ntaub ntawv.
III. Tag
Hauv cov ntsiab lus, lub PCB lub Hoobkas pawg thawj coj kub tau mus txog qhov siab kawg ntawm 500 degree C lossis ntau dua, nyob ntawm cov khoom siv uas siv rau ntawm lub rooj tsavxwm. Feem ntau cov khoom siv hluav taws xob thiab meters, peb feem ntau siv fr {1}}}}}} Cov ntaub ntawv, uas tuaj yeem ntsib feem ntau ntawm cov ntawv thov xav tau. Txawm li cas los xij, hauv qee cov ntawv thov tshwj xeeb, xws li aerospace, tub rog thiab lwm yam kev lag luam, nws yog ib qho tsim nyog los siv cov ntaub ntawv ua haujlwm siab xws li polyimide.
Yog li ntawd, thaum xaiv cov ntaub ntawv PCB, nws yog qhov tsim nyog los xaiv cov khoom hom thiab kub ua kom ntseeg tau tias lub chaw muaj kev ntseeg tau zoo thiab kev ruaj khov nyob hauv ib puag ncig kub.
