PTFENws yog lub hauv paus tseem ceeb rau cov xwm txheej ultra-high zaus xws li 5G millimeter nthwv dej thiab kev sib txuas lus satellite, tab sis nws cov khoom siv ncaj qha ua rau peb theem kev lag luam loj hauv cov txheej txheem metallization rau lub sijhawm ntev:
Kev ua kom nto yog qhov nyuaj heev: CF daim ntawv cog lus lub zog hauv PTFE molecular chains siab li 485 kJ / mol, thiab lub zog saum npoo tsuas yog 20 mJ / m ². Cov pa tshuaj tooj liab deposition pretreatment tsis tuaj yeem rhuav tshem nws cov qauv inert, thiab lub zog adhesion ntawm cov txheej tooj liab yog qis dua li 0.7 N / mm xav tau los ntawm IPC cov qauv.
Kev ntseeg tsis ua haujlwm los ntawm kev ntxhov siab thermal: Lub thermal expansion coefficient ntawm PTFE yog ntau tshaj 5 npaug ntawm FR-4, uas yog qhov tsis sib xws nrog CTE ntawm cov ntawv ci tooj liab. Qhov tshwm sim ntawm micro tawg nyob rau hauv perforated tooj liab thaum reflow soldering thiab txias kub caij tsheb kauj vab tuaj yeem ncav cuag 18%, thiab 30% ntawm lub rooj tsavxwm siab thaum ntxov yog tshwm sim los ntawm kev puas tsuaj.
Cov khib nyiab khib nyiab thaiv cov khoom siv hluav taws xob sib txuas: PTFE cov khoom muaj peb zaug ntawm qhov toughness ntawm FR-4, thiab elastic rebound thaum lub sij hawm drilling yuav tsim 5-8 μ m tuab molten drilling khib nyiab ntawm phab ntsa lub qhov. Yog tias tsis muaj cov txheej txheem ua kom zoo, qhov kev pab them nqi ntawm cov khib nyiab drilling tuaj yeem ncav cuag 40%, ncaj qha ua rau 15% nce hauv cov hlau tsis muaj zog.
Txawm hais tias kev kho ntub dej ntawm sodium naphthalene tuaj yeem ua tiav kev ua haujlwm, nws muaj qhov tsis xws luag xws li cov tshuaj fluoride pov tseg cov kua tshuaj lom neeg, kev tswj qhov kub thiab txias rau cov tshuaj tiv thaiv, thiab kev ua haujlwm tsis zoo ntawm cov txheej txheem ua haujlwm. Qhov kev tsis sib haum xeeb ntawm kev tiv thaiv ib puag ncig thiab kev tawm los tsis tuaj yeem sib raug zoo rau lub sijhawm ntev.
Cov tub ntxhais kawm txawj txawj txawj txawj ntse ntawm kev ua plasma
Kev kho ntshav ntshav siv ob qho txiaj ntsig ntawm lub cev foob pob thiab tshuaj lom neeg cov tshuaj tiv thaiv los hloov cov txheej txheem nanoscale nyias ntawm PTFE, kom tsis txhob muaj qhov tsis xws luag ntawm cov txheej txheem ntub dej.
Lub cev micro roughening: Siab zog ions ntawm argon thiab oxygen bombard lub qhov phab ntsa ntawm kev kub ceev, tev tawm cov melted drilling khib nyiab thiab tsim ib tug nano scale concave convex qauv nrog 0.5-2 μ m Ra ntawm qhov chaw. Tom qab tooj liab deposition, tooj liab txheej yog embedded rau hauv lub microstructure los tsim mechanical interlocking, zoo heev txhim kho lub sib raug zoo quab yuam.
Kev taw qhia tshuaj grafting: siv O ₂ / CF ₄ cov roj sib xyaw, xaiv rhuav tshem CF daim ntawv cog lus ntawm PTFE nto, txo cov fluorocarbon piv los ntawm 2.0 mus rau qis dua 1.4, synchronously grafting polar pawg xws li hydroxyl thiab carboxyl pawg, nce lub zog saum npoo ntawm 20mJ / m² / m 2. tooj liab deposition.
Cov yam ntxwv uas tsis tshua muaj kev puas tsuaj: tag nrho cov txheej txheem kub yog tswj ntawm 40-60 degree, tsis muaj deformation ntawm daim ntawv los ntawm thermal shock, thiab yuav tsis ua rau cov khoom tsis muaj dielectric ntawm PTFE substrate nws tus kheej. Nws yog tsim rau ntau yam thermosensitive high-frequency tshwj xeeb nplooj ntawv.
Kev sib piv ntawm cov txiaj ntsig ntau lawm tom qab kev txhim kho txheej txheem
Tom qab hloov cov txheej txheem sodium naphthalene ib txwm siv nrog kev kho ntshav plasma, cov cim tseem ceeb ntawm kev tsim cov phaj siab tau ua tiav qhov kev vam meej:
Kev txhim kho tseem ceeb hauv kev tawm los: Tom qab siv cov thev naus laus zis no mus rau qib aerospace high-frequency PCB cov kab ntau lawm, qhov dhau ntawm qhov qhov muag tsis pom qhov metallization tau nce los ntawm 82% mus rau 98%, thiab qhov tsis xws luag ntawm delamination poob qis dua 0.1%.
Kev ntseeg tau ua kom zoo dua qub: Lub zog tev ntawm cov ntawv ci tooj liab tuaj yeem ncav cuag 8N / cm, thiab tom qab dhau qhov kev kuaj mob khaub thuas thiab kub poob ntawm -55℃~ 125 degree, qhov kev hloov pauv ntawm qhov tooj liab qhov tsawg dua lossis sib npaug li 5%, tag nrho ua tau raws li qhov yuav tsum tau ua ntawm cov tub rog thiab lub tsheb muaj qhov xwm txheej siab.
Kev ua raws li ib puag ncig thiab txo nqi: Tsis muaj cov tshuaj fluoride pov tseg uas muaj kuab lom heev, tsis tas yuav muaj cov nqi kho cov khib nyiab siab, ua raws li RoHS thiab REACH thoob ntiaj teb cov kev cai ib puag ncig, thiab cov nqi khiav haujlwm mus sij hawm ntev raug txo los ntawm ntau dua 20% piv rau cov txheej txheem ntub dej.
Kev tuav pov hwm kev ua tau zoo: Tsuas yog hloov kho nrog nanoscale nyias txheej ntawm qhov chaw, tsis muaj kev puas tsuaj rau cov yam ntxwv qis Dk / Df ntawm PTFE lub cev. Insertion poob ntawm 40GHz yog txo los ntawm 0.3dB / nti piv rau cov txheej txheem ib txwm ua, ua rau nws haum rau millimeter yoj terahertz scenarios.