Lub combustibility ntawm ib yam khoom, tseem hu ua nplaim retardancy, nws tus kheej-extinguishing, nplaim kuj, nplaim kuj, hluav taws kub kuj, flammability thiab lwm yam combustibility, yog ntsuas 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.
Cov khoom PCB pawg thawj coj saib 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 hluav taws kub retardancy.Nws feem ntau yog siv rau ob sab thiab ntau txheej boards uas ua tau raws li V-1 qhov kev ntsuas hluav taws kub.Hom PCB no 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 kub ntawm lub sij hawm no yog hu ua lub iav hloov kub (Tg point), thiab tus nqi no muaj feem xyuam rau qhov seem stability ntawm PCB board.

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 "glass state" 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 tau piav qhia meej raws li hauv qab no: 94HB: zoo tib yam duab los qhia, tsis siv hluav taws xob (cov khoom siv qis tshaj plaws, tuag xuas nrig ntaus, tsis tuaj yeem siv ua lub hwj chim board) 94V0: nplaim retardant cardboard (pwm Punching) 22F: Ib leeg-sided ib nrab fiberglass board (tuag xuas nrig ntaus) CEM-1: ib leeg-sided fiberglass board (yuav tsum tau laum los ntawm lub computer, tsis tuag xuas nrig ntaus) CEM-3: Ob-sided ib nrab fiberglass board ( Tsuas yog ob-sided Cardboard yog cov khoom siv qis tshaj plaws rau ob-sided boards, yooj yim ob-sided boards siv tau cov khoom no, 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 kub ntawm lub sij hawm no yog hu ua lub iav hloov kub (Tg point), thiab tus nqi no muaj feem xyuam rau qhov seem stability ntawm PCB board.

Dab tsi yog qhov siab Tg PCB Circuit Board thiab qhov zoo ntawm kev siv siab Tg PCB

Thaum qhov kub nce mus rau ib qho chaw, lub substrate yuav hloov ntawm "glass" mus rau "rubbery", thiab qhov kub ntawm lub sij hawm no yog hu ua iav hloov kub (Tg) ntawm 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 National Standards Tam sim no, kuv lub teb chaws cov qauv rau kev faib cov ntaub ntawv PCB rau cov ntaub ntawv substrate muaj xws li GB/T4721-47221992 thiab GB4723-4725-1992.Cov txheej txheem tooj liab clad laminate nyob rau hauv Taiwan, Tuam Tshoj yog CNS tus qauv, uas yog raws li tus qauv Japanese JIs., Tso tawm xyoo 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, AS cov qauv hauv Australia, FOCT cov qauv hauv lub qub Soviet Union, thoob ntiaj teb IEC cov qauv, 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.

● Cov ntaub ntawv lees paub: protel autocad powerpcb orcad gerber lossis tiag board daim ntawv luam, thiab lwm yam.

● Board hom: CEM-1, CEM -3 FR4, siab TG khoom;

● 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: 16 Layers

● Copper foil txheej Thickness: 0.5-4.0 (oz)

● Tiav board thickness kam rau ua: +/- 0.1mm (4mil)

● Tsim qhov ntev kam rau ua: 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 drilling qhov txoj kab uas hla ntawm cov khoom tiav: 0.25mm (10mil) Qhov tsawg kawg nkaus xuas nrig ntaus lub qhov taub ntawm cov khoom tiav: 0.9mm (35mil) Lub siab ntev ntawm cov khoom tiav qhov taub: PTH: +-0.075mm (3mil) NPTH Ntev: +-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 spray, tag nrho lub rooj tsavxwm yog npib tsib xee-plated kub (dej / mos kub), silk screen xiav kua nplaum, thiab lwm yam.

● Solder mask thickness ntawm lub rooj tsavxwm: 10-30μm (0.4-1.2mil)

● Peeling zog: 1.5N / mm (59N / mil)

● Resistance Solder zaj duab xis hardness:> 5H

● Solder resistance 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, cov khoom siv hluav taws xob hauv tsheb, cov cuab yeej siv hluav taws xob, lub ntiaj teb tso qhov system, khoos phis tawj, MP4, fais fab mov, khoom siv hauv tsev, thiab lwm yam.

Raws li PCB board reinforcement cov ntaub ntawv, nws yog feem ntau muab faib ua cov nram qab no hom:
1. Phenolic PCB ntawv substrate
Vim tias lub rooj tsavxwm PCB no yog tsim los ntawm cov ntawv sau, ntoo pulp, thiab lwm yam, qee zaum nws dhau los ua duab los qhia, V0 board, nplaim hluav taws kub thiab 94HB, thiab lwm yam. synthesized los ntawm phenolic resin siab.phaj.Hom ntawv substrate no tsis muaj hluav taws kub, tuaj yeem xuas nrig ntaus, muaj tus nqi qis, tus nqi qis, thiab tus txheeb ze tsis tshua muaj.Peb feem ntau pom phenolic ntawv substrates xws li XPC, FR-1, FR-2, FE-3, thiab lwm yam. Thiab 94V0 belongs rau nplaim hluav taws-retardant paperboard, uas yog fireproof.

2. Composite PCB substrate
Cov hmoov nplej no tseem hu ua hmoov board, nrog cov ntaub ntawv ntoo fiber ntau lossis paj rwb cov ntaub ntawv fiber ntau raws li cov khoom siv ntxiv, thiab cov ntaub iav fiber ntau raws li cov khoom siv saum npoo av tib lub sijhawm.Ob qho khoom siv yog ua los ntawm cov nplaim hluav taws-retardant epoxy resin.Muaj ib sab ib nrab iav fiber ntau 22F, CEM-1 thiab ob-sided ib nrab iav fiber board CEM-3, ntawm cov uas CEM-1 thiab CEM-3 yog cov feem ntau composite puag tooj liab clad laminates.

3. iav fiber ntau PCB substrate
Qee lub sij hawm nws kuj dhau los ua epoxy board, iav fiber ntau pawg thawj coj saib, FR4, fiber ntau pawg thawj coj saib, thiab lwm yam. Nws siv epoxy resin li nplaum thiab iav fiber ntau li cov khoom siv ntxiv.Hom Circuit Board no muaj qhov kub thiab txias ua haujlwm thiab tsis cuam tshuam los ntawm ib puag ncig.Lub rooj tsavxwm no feem ntau siv ob sab PCB, tab sis tus nqi kim dua li cov khoom sib xyaw PCB substrate, thiab cov tuab tuab yog 1.6MM.Hom substrate no yog tsim rau ntau lub hwj chim mov boards, high-theem Circuit Court boards, thiab yog dav siv nyob rau hauv cov computers, peripheral khoom, thiab cov khoom siv sib txuas lus.

FR-4

4. Lwm tus