- Los ntawm pcb ntiaj teb,
Lub combustibility ntawm cov ntaub ntawv, tseem hu ua nplaim retardancy, nws tus kheej-extinguishing, nplaim kuj, nplaim kuj, hluav taws kub kuj, flammability thiab lwm yam combustibility, yog soj ntsuam lub peev xwm ntawm cov khoom los tiv thaiv combustion.
Cov qauv ntawm cov khoom siv hluav taws xob yog ignited nrog cov nplaim hluav taws uas ua tau raws li qhov yuav tsum tau ua, thiab cov nplaim taws raug tshem tawm tom qab lub sijhawm teev tseg.Cov qib flammability raug soj ntsuam raws li qib ntawm combustion ntawm cov qauv.Muaj peb theem.Txoj kev kuaj kab rov tav ntawm tus qauv muab faib ua FH1, FH2, FH3 theem peb, txoj kev ntsuas ntsug muab faib ua FV0, FV1, VF2.
Lub rooj tsavxwm PCB tau muab faib ua HB board thiab V0 board.
HB daim ntawv muaj cov nplaim hluav taws kub tsawg thiab feem ntau yog siv rau ib sab boards.
VO board muaj cov nplaim hluav taws kub thiab feem ntau yog siv hauv ob sab thiab ntau txheej boards
Hom PCB board uas ua tau raws li V-1 qhov kev ntsuas hluav taws kub yuav dhau los ua FR-4 board.
V-0, V-1, thiab V-2 yog qib fireproof.
Lub rooj tsav xwm hluav taws xob yuav tsum yog nplaim hluav taws, tsis tuaj yeem hlawv ntawm qhov kub thiab txias, tab sis tsuas yog tuaj yeem muag muag.Qhov ntsuas kub ntawm lub sijhawm no yog hu ua iav hloov pauv kub (Tg point), thiab tus nqi no cuam tshuam rau qhov kev ruaj ntseg ntawm PCB pawg thawj coj saib.
Dab tsi yog qhov siab Tg PCB Circuit Board thiab qhov zoo ntawm kev siv lub siab Tg PCB?
Thaum qhov kub ntawm lub siab Tg luam ntawv board nce mus rau ib qho chaw, lub substrate yuav hloov los ntawm "iav lub xeev" mus rau "lub xeev roj hmab".Qhov kub ntawm lub sijhawm no yog hu ua iav hloov pauv kub (Tg) ntawm lub rooj tsavxwm.Hauv lwm lo lus, Tg yog qhov kub siab tshaj plaws uas lub substrate tswj rigidity.
Dab tsi yog hom PCB boards?
Muab faib los ntawm qib qis mus rau qib siab raws li hauv qab no:
94HB - 94VO - 22F - CEM-1 - CEM-3 - FR-4
Cov ntsiab lus yog raws li nram no:
94HB: cov duab los qhia zoo tib yam, tsis muaj hluav taws kub (cov khoom siv qis tshaj plaws, tuag xuas nrig ntaus, tsis tuaj yeem siv los ua lub hwj huam mov)
94V0: Flame Retardant Cardboard (Tuag Punching)
22F: Ib sab ib nrab iav fiber ntau pawg thawj coj saib (tuag xuas nrig ntaus)
CEM-1: Ib leeg-sided fiberglass board (lub computer drilling yog tsim nyog, tsis tuag xuas nrig ntaus)
CEM-3: Ob-sided ib nrab iav fiber ntau pawg thawj coj saib (tshwj tsis yog rau ob sab duab los qhia, nws yog cov khoom siv qis kawg ntawm ob sab board, yooj yim.
Cov khoom siv no tuaj yeem siv rau ob chav panels, uas yog 5 ~ 10 yuan / square meter pheej yig dua FR-4)
FR-4: Ob chav sided fiberglass board
Lub rooj tsav xwm hluav taws xob yuav tsum yog nplaim hluav taws, tsis tuaj yeem hlawv ntawm qhov kub thiab txias, tab sis tsuas yog tuaj yeem muag muag.Qhov ntsuas kub ntawm lub sijhawm no yog hu ua iav hloov pauv kub (Tg point), thiab tus nqi no cuam tshuam rau qhov kev ruaj ntseg ntawm PCB pawg thawj coj saib.
Dab tsi yog qhov siab Tg PCB Circuit Board thiab qhov zoo ntawm kev siv lub siab Tg PCB.Thaum qhov kub nce mus rau ib qho chaw, lub substrate yuav hloov ntawm "iav xeev" mus rau "lub xeev roj hmab".
Qhov kub ntawm lub sijhawm ntawd yog hu ua iav hloov pauv kub (Tg) ntawm lub phaj.Hauv lwm lo lus, Tg yog qhov kub siab tshaj plaws (° C) uas lub substrate tswj rigidity.Qhov ntawd yog hais tias, cov ntaub ntawv zoo tib yam PCB substrate tsis tsuas yog tsim softening, deformation, melting thiab lwm yam tshwm sim nyob rau hauv high kub, tab sis kuj qhia ib tug ntse poob nyob rau hauv txhua yam thiab hluav taws xob yam ntxwv (Kuv xav tias koj tsis xav pom qhov kev faib tawm ntawm PCB boards. thiab pom qhov xwm txheej no hauv koj cov khoom.).
Feem ntau Tg phaj yog ntau tshaj 130 degrees, lub siab Tg feem ntau yog ntau tshaj 170 degrees, thiab nruab nrab Tg yog hais txog ntau tshaj 150 degrees.
Feem ntau PCB luam ntawv boards nrog Tg ≥ 170 ° C yog hu ua siab Tg luam ntawv boards.
Raws li Tg ntawm lub substrate nce, lub tshav kub tsis kam, noo noo tsis kam, tshuaj tiv thaiv, stability thiab lwm yam ntxwv ntawm lub board luam ntawv yuav raug txhim kho thiab txhim kho.Qhov siab dua TG tus nqi, qhov zoo dua qhov ntsuas kub ntawm lub rooj tsavxwm, tshwj xeeb tshaj yog nyob rau hauv cov txheej txheem tsis muaj txhuas, qhov siab Tg daim ntawv thov ntau dua.
High Tg hais txog kev kub siab ua haujlwm.Nrog rau txoj kev loj hlob sai ntawm kev lag luam hluav taws xob, tshwj xeeb tshaj yog cov khoom siv hluav taws xob uas sawv cev los ntawm cov khoos phis tawj, kev txhim kho ntawm kev ua haujlwm siab thiab siab multilayers yuav tsum muaj kev kub ntxhov siab dua ntawm cov khoom siv hauv PCB raws li qhov tseem ceeb lav.Kev tshwm sim thiab kev loj hlob ntawm high-density mounting technologies sawv cev los ntawm SMT thiab CMT tau ua PCBs ntau thiab ntau inseparable los ntawm kev txhawb siab kub tsis kam ntawm substrates nyob rau hauv cov nqe lus ntawm me me aperture, nplua hlau, thiab thinning.
Yog li ntawd, qhov sib txawv ntawm qhov dav dav FR-4 thiab siab Tg FR-4: nws yog nyob rau hauv lub xeev kub, tshwj xeeb tshaj yog tom qab nqus noo noo.
Nyob rau hauv lub tshav kub, muaj qhov sib txawv ntawm lub zog txhua yam, qhov ntev stability, adhesion, dej nqus, thermal decomposition, thiab thermal expansion ntawm cov ntaub ntawv.High Tg cov khoom yog pom tseeb zoo dua li cov khoom siv PCB substrate.
Nyob rau hauv xyoo tas los no, tus naj npawb ntawm cov neeg siv khoom xav tau kev tsim cov ntawv luam tawm siab Tg tau nce xyoo los ntawm xyoo.
Nrog rau kev txhim kho thiab kev nce qib ntawm kev siv tshuab hluav taws xob tsis tu ncua, cov kev xav tau tshiab niaj hnub tau muab tso rau pem hauv ntej rau cov ntawv luam tawm Circuit Board substrate cov ntaub ntawv, yog li txhawb kev txhim kho txuas ntxiv ntawm tooj liab clad laminate qauv.Tam sim no, cov qauv tseem ceeb rau cov khoom siv substrate yog raws li hauv qab no.
① Cov qauv hauv teb chaws Tam sim no, kuv lub teb chaws cov qauv rau kev faib cov ntaub ntawv PCB rau substrates suav nrog GB /
T4721-47221992 thiab GB4723-4725-1992, tooj liab clad laminate qauv nyob rau hauv Taiwan, Tuam Tshoj yog CNS qauv, uas yog raws li nyob rau hauv Japanese JIs tus qauv thiab tau muab nyob rau hauv 1983.
②Lwm cov qauv hauv tebchaws suav nrog: Japanese JIS cov qauv, American ASTM, NEMA, MIL, IPc, ANSI, UL cov qauv, British Bs qauv, German DIN thiab VDE cov qauv, Fabkis NFC thiab UTE qauv, thiab Canadian CSA Standards, Australia tus qauv AS, tus qub Soviet Union tus qauv FOCT, tus qauv thoob ntiaj teb IEC, thiab lwm yam.
Cov neeg muag khoom ntawm cov ntaub ntawv tsim PCB yog cov khoom siv thiab feem ntau siv: Shengyi \ Jiantao \ International, thiab lwm yam.
● Txais cov ntaub ntawv: protel autocad powerpcb orcad gerber lossis tiag board daim ntawv luam, thiab lwm yam.
● Sheet hom: CEM-1, CEM-3 FR4, siab TG cov ntaub ntawv;
● Qhov siab tshaj plaws pawg thawj coj saib loj: 600mm * 700mm (24000mil * 27500mil)
● Ua board thickness: 0.4mm-4.0mm (15.75mil-157.5mil)
● Cov txheej txheem ntau tshaj plaws: 16Layers
● Copper foil txheej thickness: 0.5-4.0 (oz)
● Tiav board thickness kam rau ua: +/- 0.1mm (4mil)
● Kev ua kom ntev ntev: lub computer milling: 0.15mm (6mil) tuag xuas nrig ntaus phaj: 0.10mm (4mil)
● Yam tsawg kawg kab dav / qhov sib nrug: 0.1mm (4mil) Kab dav tswj peev xwm: <+-20%
● Qhov tsawg kawg nkaus txoj kab uas hla ntawm cov khoom tiav: 0.25mm (10mil)
Yam tsawg kawg nkaus xuas nrig ntaus lub qhov taub ntawm cov khoom tiav: 0.9mm (35mil)
Tiav qhov qhov kam rau ua: PTH: +-0.075mm (3mil)
NPTH: +-0.05mm (2mil)
● Tiav qhov phab ntsa tooj liab thickness: 18-25um (0.71-0.99mil)
● Yam tsawg kawg SMT thaj sib nrug: 0.15mm (6mil)
● Txheej txheej: tshuaj immersion kub, tin tsuag, npib tsib xee-plated kub (dej / mos kub), silk screen xiav kua nplaum, thiab lwm yam.
● Lub thickness ntawm lub npog ntsej muag ntawm lub rooj tsavxwm: 10-30μm (0.4-1.2mil)
● Peeling zog: 1.5N / mm (59N / mil)
● Hardness ntawm daim npog qhov ncauj: > 5H
● Solder mask plug qhov muaj peev xwm: 0.3-0.8mm (12mil-30mil)
● Dielectric qhov tsis tu ncua: ε = 2.1-10.0
● Rwb thaiv tsev tsis kam: 10KΩ-20MΩ
● Cov yam ntxwv impedance: 60 ohm ± 10%
● Thermal shock: 288 ℃, 10 sec
● Warpage ntawm board tiav: <0.7%
● Cov khoom siv: cov khoom siv sib txuas lus, khoom siv hluav taws xob hauv tsheb, kev ntsuas, qhov chaw thoob ntiaj teb, lub computer, MP4, fais fab mov, khoom siv hauv tsev, thiab lwm yam.