PCB xaiv substrate

Thawj qhov kev txiav txim siab rau xaiv cov substrates yog qhov kub (vuam thiab ua haujlwm), cov khoom siv hluav taws xob, kev sib txuas sib txuas (cov khoom siv vuam, cov khoom sib txuas), cov txheej txheem lub zog thiab kev sib zog hauv Circuit Court, thiab lwm yam. Thov xa mus rau daim duab hauv qab no kom paub meej:

▲ Substrate selection diagram (source: source “GJB 4057-2000 Printed Circuit Board Design Requirements for Military electronics Equipment”)

Lub npe piav qhia

FR-4

Fr-4 yog cov nplaim hluav taws tiv taus cov khoom hauv chav kawm ntawv, uas sawv cev rau lub ntsiab lus ntawm cov khoom siv yas tom qab lub xeev kev sib tsoo yuav tsum muaj peev xwm tua tus kheej cov khoom tshwj xeeb, nws tsis yog lub npe khoom, tab sis cov khoom siv hauv chav kawm.

Tg/ iav hloov pauv kub

Tg tus nqi hais txog qhov ntsuas kub uas cov khoom hloov pauv los ntawm lub iav iav nruj dua mus rau lub xeev cov roj hmab uas hloov pauv thiab hloov pauv tau. Nco ntsoov tias cov khoom siv hloov pauv siab dua Tg.

CTI

CTI: Sib piv Taug Qab Kev Ntsuas, cov ntawv luv ntawm Sib Piv Taug Qab Kev Ntsuas.

Lub ntsiab lus: nws yog qhov taw qhia ntawm kev tiv thaiv to. Hauv lub xeev thov siv qhov hluav taws xob rau saum npoo ntawm cov khoom siv rwb thaiv tsev, ua rau cov tshuaj electrolytic poob rau ntawm cov khoom lag luam pwm ntawm cov hluav taws xob, thiab ntsuas qhov hluav taws xob kom txog thaum tsis muaj kev puas tsuaj.

Qib CTI: qib CTI ntawm 0 txog 5. Tus lej me dua, qhov siab dua qhov ua rau tsis kam.

PI

Polyimide (PI) yog ib qho ntawm cov organic polymer cov ntaub ntawv nrog kev ua tau zoo tshaj plaws.Nws qhov kub tsis kam tiv taus txog 400 ℃ saum toj no, siv sijhawm ntev kub ntau ntawm -200 ~ 300 ℃, ib feem ntawm qhov tsis muaj qhov pom tseeb melting point, kev ua haujlwm siab rwb thaiv tsev, 103 hz dielectric tas li 4.0, dielectric poob tsuas yog 0.004 ~ 0.007, teej tug mus rau F rau H.

CE

(1) CE cyanate cob yog ib yam tshiab ntawm cov khoom siv hluav taws xob thiab cov khoom siv rwb thaiv tsev, uas yog ib qho ntawm cov ntaub ntawv tseem ceeb hauv kev siv cov khoom siv hluav taws xob thiab kev siv tshuab sib txuas lus microwave. Nws yog cov khoom siv zoo tshaj plaws cov khoom siv matrix rau radome. Vim tias nws cov thermal zoo ruaj khov thiab tiv taus tshav kub, tsis muaj qhov nthuav dav nthuav dav coefficient thiab lwm yam zoo, CE resin tau dhau los ua cov khoom lag luam zoo tshaj plaws rau kev tsim cov khoom siv ntau zaus, ua haujlwm tau zoo, muaj hluav taws xob zoo luam tawm Circuit board; Ib qho ntxiv, cov ntawv pov thawj CE yog cov khoom ntim ntim tau zoo.

(2) CE resin tuaj yeem siv rau kev tsim tub rog, kev ya dav hlau, dav hlau, dav hlau txheej txheem txheej txheem, xws li tis, nkoj nkoj, thiab lwm yam.

(3) CE resin muaj kev sib raug zoo, thiab epoxy resin, polyester tsis txaus thiab lwm cov copolymerization tuaj yeem txhim kho cov cua sov thiab cov khoom siv dag zog ntawm cov khoom, tseem tuaj yeem siv los hloov lwm cov resins, siv ua cov nplaum, txheej txheej, ua cov yas ua npuas dej media ntaub ntawv, thiab lwm yam.

(4) CE yog cov khoom siv sib kis tau zoo uas muaj kev sib kis tau zoo thiab pom tau zoo.

PTFE

Poly Tetra fluoroethylene (PTFE), feem ntau hu ua “txheej tsis lo” lossis “yooj yim los ntxuav cov khoom”. Cov khoom siv no muaj cov yam ntxwv ntawm kua qaub thiab alkali tsis kam, tiv taus ntau yam kuab tshuaj organic thiab kub.

Kub kub tsis kam: siv sijhawm ntev ntawm 200 ~ 260 degrees;

Tsawg kub tsis kam: tseem mos ntawm -100 degrees;

Corrosion kuj: muaj peev xwm aqua regia thiab tag nrho cov organic solvents;

Huab cua tsis kam: lub neej laus tshaj plaws ntawm cov yas;

Lubrication siab: qhov qis tshaj coefficient txhuam ntawm plastics (0.04);

Nonviscous: muaj qhov tsawg tshaj plaws nto nro ntawm ib tug khoom cov ntaub ntawv uas tsis adhering rau tej yam khoom uas;

Tsis muaj tshuaj lom: lub cev tsis muaj zog; Kev siv hluav taws xob zoo tshaj plaws, yog cov khoom siv hluav taws xob zoo C chav kawm ntawv, txheej tuab ntawm ntawv xov xwm tuaj yeem thaiv 1500V qhov hluav taws xob siab; Nws du dua dej khov.

Txawm hais tias nws yog PCB tsim tib yam, lossis muaj ntau zaus, tsim PCB nrawm, xaiv cov txheej txheem yog qhov kev paub tseem ceeb, peb xav tau tus tswv. (Kev sib xyaw PCB).