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Puas tsim nyog tau txais txhua yam koj yuav tsum paub txog Tg hauv PCB? | Tshuab zoo tshaj

Lub Xya Hli 22, 2023

Kev hloov pauv kub ua haujlwm tuaj yeem ua rau muaj kev cuam tshuam loj rau kev ua haujlwm, kev ntseeg tau, lub neej ntev thiab cov khoom zoo. Qhov kub nce siab ua rau cov ntaub ntawv nthuav dav, txawm li cas los xij, cov ntaub ntawv substrate uas PCB yog ua los ntawm muaj cov thermal expansion coefficients sib txawv, qhov no ua rau cov neeg kho tshuab kev ntxhov siab uas tuaj yeem tsim micro-cracks uas tej zaum yuav tsis pom thaum kuaj hluav taws xob ua thaum kawg ntawm kev tsim khoom.

 

Raws li txoj cai ntawm RoHS tau tshaj tawm xyoo 2002 yuav tsum muaj cov hlau lead-dawb alloys rau soldering. Txawm li cas los xij, tshem tawm cov hlau lead ncaj qha ua rau qhov nce ntawm qhov kub thiab txias, cov ntawv luam tawm Circuit Court boards yog vim li no yuav raug kub siab dua thaum lub sij hawm soldering (xws li reflow thiab yoj). Nyob ntawm cov txheej txheem reflow xaiv (ib zaug, ob npaug ...), nws yog qhov yuav tsum tau siv PCB nrog cov yam ntxwv tsim nyog, tshwj xeeb tshaj yog ib qho uas tsim nyog Tg. 


Tg yog dab tsi?

Tg (iav hloov kub) yog tus nqi kub uas lav qhov kev ruaj ntseg ntawm PCB thaum lub sijhawm ua haujlwm lub neej ntawm PCB, nws yog hais txog qhov kub thiab txias uas lub substrate melts los ntawm cov khoom mus rau rubberized kua, peb hu ua Tg point, los yog melting point kom nkag siab yooj yim. Qhov siab dua Tg taw tes yog, qhov siab dua qhov yuav tsum tau ua ntawm lub rooj tsavxwm yuav tsum yog thaum laminated, thiab siab Tg board tom qab laminated kuj yuav nyuaj thiab nkig, uas muaj txiaj ntsig rau cov txheej txheem tom ntej xws li tshuab drilling (yog tias muaj) thiab khaws cov khoom hluav taws xob zoo dua thaum siv.

Lub iav hloov pauv kub yog qhov nyuaj los ntsuas qhov tseeb hauv kev xav txog ntau yam, nrog rau txhua yam khoom muaj nws tus kheej cov qauv molecular, yog li ntawd, cov ntaub ntawv sib txawv muaj qhov sib txawv iav hloov kub, thiab ob cov ntaub ntawv sib txawv yuav muaj Tg tus nqi tib yam txawm tias lawv muaj cov yam ntxwv sib txawv, qhov no ua rau peb muaj lwm txoj kev xaiv thaum cov khoom xav tau tawm ntawm Tshuag.


Nta ntawm High Tg cov ntaub ntawv

l  Zoo dua thermal stability

l  Zoo tiv taus noo noo

l  Tsawg thermal expansion coefficient

l  Cov tshuaj tiv thaiv zoo dua li cov khoom siv Tg tsawg

l  Tus nqi siab ntawm thermal stress kuj

l  Kev ntseeg tau zoo heev


Qhov zoo ntawm High Tg PCB

Feem ntau, ib txwm PCB FR4-Tg yog 130-140 degrees, qhov nruab nrab Tg yog siab dua 150-160 degrees, thiab siab Tg siab tshaj 170 degrees, siab FR4-Tg yuav muaj zoo mechanical thiab tshuaj tiv thaiv kom sov thiab noo tshaj tus qauv FR4, ntawm no yog ib co zoo ntawm siab Tg PCB rau koj xyuas: 

1.       Kev ruaj ntseg siab dua: Nws yuav cia li txhim kho cov cua sov, tshuaj tiv thaiv, dej tsis kam, nrog rau kev ruaj ntseg ntawm cov cuab yeej yog tias nce Tg ntawm PCB substrate.

2.       Withstt high zog zog tsim: Yog tias cov cuab yeej muaj lub zog siab dua thiab tus nqi siab Calorific, tom qab ntawd Kub Calcb yuav yog cov tshuaj zoo rau kev tswj hwm cua sov. 

3.       Cov ntawv luam tawm loj dua tuaj yeem siv los hloov cov qauv tsim thiab lub zog ntawm cov khoom siv thaum txo cov cua sov ntawm cov laug cam, thiab siab Tg PCBS kuj tseem siv tau. 

4.       Kev xaiv zoo tshaj plaws ntawm ntau txheej thiab HDI PCB: Vim tias ntau txheej thiab HDI PCB muaj ntau qhov sib txuam thiab Circuit Court ntom, nws yuav ua rau muaj kev kub ntxhov siab.  Yog li ntawd, siab TG PCBs feem ntau yog siv ntau txheej thiab HDI PCBs los xyuas kom meej qhov kev ntseeg siab ntawm PCB manufacturing.


Thaum twg koj xav tau High Tg PCB?

Feem ntau los xyuas kom meej qhov ua tau zoo tshaj plaws ntawm PCB, qhov siab tshaj plaws kev khiav hauj lwm kub ntawm lub rooj tsavxwm Circuit Court yuav tsum yog li ntawm 20 degrees tsawg tshaj li lub iav hloov kub. Piv txwv li, yog tias Tg tus nqi ntawm cov khoom yog 150 degrees, ces qhov tseeb kev khiav hauj lwm kub ntawm lub Circuit Court board yuav tsum tsis txhob ntau tshaj 130 degrees. Yog li, thaum twg koj xav tau siab Tg PCB?

1.       Yog tias koj daim ntawv thov kawg yuav tsum tau nqa lub thermal load ntau dua 25 degrees centigrade hauv qab Tg, ces lub siab Tg PCB yog qhov kev xaiv zoo tshaj plaws rau koj cov kev xav tau.

2.       Txhawm rau kom muaj kev nyab xeeb thaum koj cov khoom xav tau kev ua haujlwm kub sib npaug lossis siab dua 130 degrees, siab Tg PCB yog qhov zoo rau koj daim ntawv thov.

3.       Yog tias koj daim ntawv thov xav tau ntau txheej PCB kom tau raws li koj xav tau, ces cov khoom siv Tg siab yog qhov zoo rau PCB.


Cov ntawv thov uas xav tau Tg siab PCB

l  Rooj vag

l  Inverter

l  Kav hlau txais xov

l  Wifi Booster

l  Embedded Systems Development

l  Embedded Computer Systems

l  Cov Khoom Siv Hluav Taws Xob

l  RF khoom

l  LED kev lag luam

 

Qhov zoo tshaj plaws Tech muaj kev nplua nuj nyob hauv kev tsim High Tg PCB, peb tuaj yeem ua PCBs los ntawm Tg170 mus rau qhov siab tshaj plaws Tg260, lub sijhawm no, yog tias koj daim ntawv thov yuav tsum siv nyob rau hauv qhov kub siab heev li 800C, koj yuav zoo dua siv.Ceramic Board uas tuaj yeem mus txog -55 ~ 880C.


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