Ibisabwa kugirango bigurishwe kubusa kugurisha PCB

Uburyo bwo kugurisha ibicuruzwa bidafite isuku bifite byinshi bisabwa kuri PCB kuruta inzira ishingiye.Ubushyuhe bwo kurwanya PCB nibyiza, ubushyuhe bwikirahure bwikirahure Tg buri hejuru, coefficente yo kwagura amashyuza ni mike, kandi igiciro ni gito.

Isonga-yubusa kugarura ibisabwa kuri PCB.

Mugurisha ibicuruzwa, Tg numutungo wihariye wa polymers, ugena ubushyuhe bukomeye bwibintu.Mugihe cyo kugurisha SMT, ubushyuhe bwo kugurisha buri hejuru cyane ya Tg ya substrate ya PCB, kandi ubushyuhe bwo kugurisha butagira isasu burenze 34 ° C kurenza ubwo hamwe na gurş, ibyo bikaba byoroha guhindura ubushyuhe bwa PCB no kwangirika kubigize mugihe cyo gukonja.Ibikoresho shingiro PCB hamwe na Tg yo hejuru bigomba guhitamo neza.

Mugihe cyo gusudira, niba ubushyuhe bwiyongereye, Z-axis yimiterere myinshi PCB ntabwo ihuye na CTE hagati yibikoresho byanduye, fibre y ibirahure, na Cu muburyo bwa XY, bizabyara impagarara nyinshi kuri Cu, no muri ibihe bikomeye, bizatera isahani yumwobo wacitse kandi itera inenge yo gusudira.Kuberako biterwa nibihinduka byinshi, nkumubare wa PCB, ubunini, ibikoresho bya laminate, kugurisha umurongo, hamwe no gukwirakwiza Cu, ukoresheje geometrie, nibindi.

Mubikorwa byacu nyirizina, twafashe ingamba zimwe na zimwe kugira ngo tuneshe kuvunika umwobo wacuzwe mu kibaho kinini: urugero, fibre ya resin / ikirahure ikurwa imbere mu mwobo mbere yo gukwirakwiza amashanyarazi mu kiruhuko.Gushimangira imbaraga zo guhuza urukuta rwumwobo hamwe nurubaho rwinshi.Ubujyakuzimu bwa etch ni 13 ~ 20µm.

Ubushyuhe ntarengwa bwa FR-4 substrate PCB ni 240 ° C.Kubicuruzwa byoroshye, ubushyuhe bwo hejuru bwa 235 ~ 240 ° C burashobora kuzuza ibisabwa, ariko kubicuruzwa bigoye, birashobora gukenera 260 ° C kugurishwa.Kubwibyo, amasahani yuzuye nibicuruzwa bigoye bigomba gukoresha ubushyuhe bwo hejuru burwanya FR-5.Kuberako igiciro cya FR-5 kiri hejuru cyane, kubicuruzwa bisanzwe, base base CEMn irashobora gukoreshwa mugusimbuza FR-4 substrates.CEMn nikintu gikomeye gikomatanyije cyumuringa wambaye laminate yubuso hamwe nintangiriro bikozwe mubikoresho bitandukanye.CEMn kubugufi byerekana moderi zitandukanye.