Lub zog nplaum ntawm polyimide daim kab xev, tseem hu ua Kapton daim kab xev, feem ntau tsuas yog ib qho tseem ceeb nyob rau hauv siab - qhov kub thiab txias raws li nws lub peev xwm ntxuav huv. Adhesive residue tuaj yeem ua rau kev sib cuag tsis zoo lossis txheej txheej adhesion tsis ua haujlwm hauv kev xav tau kev tsim hluav taws xob thiab kev siv aerospace.
Yog li yuav ua li cas cov engineers ntsuas qhov PI daim kab xev residue -kev ua haujlwm pub dawb, dhau ntawm kev tshuaj xyuas cov lus qhia tshwj xeeb?
Dab tsi ua rau cov nplaum residue tsim?
Nkag siab txog lub hauv paus chiv keeb ntawm physicochemical ntawm cov nplaum residue yog qhov tseem ceeb ua ntej tham txog kev ntsuam xyuas cov txheej txheem. PI zaj duab xis thiab silicone siab- rhiab nplaum (Silicone PSA) yog cov khoom siv niaj hnub ntawm polyimide daim kab xev.
Peb qhov laj thawj hauv qab no feem ntau yog lub luag haujlwm rau cov nplaum residue:
Thermal Degradation: Txhaum cov saw hlau molecular thaum cov nplaum qhov kub siab tshaj.
Cohesive Failure: Cov nplaum nws tus kheej tsis muaj zog, uas ua rau cov nplaum tawg thaum raug tev.
chemical cross-kev sib txuas ntawm cov nplaum thiab cov substrate (xws li solder mask ink ntawm PCB) yog lub npe hu ua cov tshuaj tiv thaiv saum npoo.
Peb Cov Txheej Txheem Tseem Ceeb rau Kev Ntsuas Kev Ntsuas
Cov hauv qab no yog cov txheej txheem ntsuas kev ntsuas tus qauv:
A. Simulated Reflow Soldering Test
Txoj kev no yog qhov zoo ib yam li cov xwm txheej tiag tiag.
1. Muab daim kab xev rau ntawm daim npog ntsej muag lossis laminate nto npog hauv tooj liab.
2. Muab tso rau hauv qhov cub reflow rau tsib mus rau kaum feeb ntawm qhov kub siab tshaj plaws, uas feem ntau yog 260 degree.
3. Qhov taw qhia tseem ceeb: Tam sim ntawd tshem daim kab xev ntawm lub kaum sab xis 90℃lossis 180℃thaum nws tau txias rau hauv chav tsev kub, tom qab ntawd xyuas seb puas muaj qhov seem pov thawj ntawm qhov chaw.
B. Static Aging Test ntawm Kub Kub
ntsuas qhov ntev -lub sij hawm ruaj khov uas tsis yog qhov kub siab tam sim ntawd.
Rau ib hnub tag nrho, muab tso rau hauv qhov cub kub ntawm 200 degrees.
Kev soj ntsuam cov txheej txheem: Txiav txim siab seb cov kab xev npoo nthuav tawm "flagging" lossis "oozing."
C. Tiv tauj lub kaum sab xis thiab qhov ntsuas hluav taws xob
Tej zaum yuav muaj ib qho kev hloov pauv ntawm silicone txawm tias tsis muaj qhov seem uas pom tseeb rau qhov muag tsis pom.
Tom qab tev, txiav txim siab lub kaum sab xis ntawm cov dej ntws ntawm qhov chaw. Lub adhesion tom qab dispensing lossis conformal txheej yuav raug cuam tshuam loj heev yog tias lub kaum sab xis sib cuag tau nce ntxiv, uas qhia tau tias qhov chaw muaj kuab paug nrog cov kab ntawm silicon.
Cov ntsiab lus tseem ceeb hauv kev xam cov kev ua tau zoo yam tsis muaj qhov seem
Thov sau ntawv tshwj xeeb ntawm cov ntaub ntawv hauv qab no thaum kuaj xyuas daim ntawv qhia kev paub (TDS):
| Zoo tagnrho | Qhov taw qhia qhov tseem ceeb ntawm Key | Parameters for Residue-Kev Ua Haujlwm Dawb |
| Thickness ntawm Substrate (Base Film) | 1 mil (0.025 hli) | Muab lub zog tensile txaus kom lub substrate tsis txhob tawg thaum raug tev |
| Peel Adhesion | 5-8 N / 25 hli | Kev ruaj ntseg txuas thiab yooj yim, huv si tshem tawm yog lav los ntawm nruab nrab viscosity |
| Kev sib koom tes | Tsis muaj kev hloov pauv ntawm qhov kub thiab txias | Xyuas kom meej tias cov nplaum nplaum tsis nyob ntawm lub substrate |
Yuav ua li cas thiaj li muaj peev xwm ntawm cov nplaum nplaum yuav txo tau?
Kos los ntawm ntau xyoo ntawm kev txawj ntse hauv kev ua haujlwm, peb qhia kom tsom mus rau cov hauv qab no thaum ua haujlwm:
Tiv thaiv "kub peeling"
Los ntawm tos kom tshem tawm daim kab xev kom txog thaum lub workpiece tau txias tag rau hauv chav tsev kub. Cov nplaum nplaum yog nyob rau hauv siab - lub zog lub zog thiab nws yooj yim rau cohesive tsis ua hauj lwm ntawm qhov kub thiab txias.
Nto huv huv:
Lub wettability ntawm cov nplaum yuav raug hloov los ntawm cov roj los yog cov dej ntws tawm ntawm qhov chaw yuav tsum tau sib koom ua ke, uas ua rau muaj qhov tsis txaus ntseeg.
Cia ib puag ncig:
PI daim kab xev yuav tsum muab cia rau hauv lub teeb - tiv thaiv ib puag ncig ntawm 23 ± 2℃thiab 50 ± 5% av noo. Daim kab xev tas sij hawm yuav ntsib kev tsiv teb tsaws ntawm silicon molecules.
Ib qho kev sim yuav tsum tsis yog tib lub hauv paus rau kev ntsuam xyuas covpolyimide daim kab xevresidue- ua haujlwm dawb. Ntau- cov ntaub ntawv ntsuas lub voj voog thiab thib peb- cov ntawv pov thawj ntawm tog neeg (xws li UL thiab SGS) yuav tsum tau muab los ntawm qhov chaw ntseeg siab.
