A yau, bari mu fahimci abin da ke haifar da etching factor a cikin yumbura.
A cikin PCB yumbu, akwai nau'in PCB da ake kira DBC ceramic PCB, wanda ke nufin abubuwan da aka haɗa da yumbura kai tsaye. Wannan sabon nau'in kayan haɗin gwiwa ne inda yumbu mai yumbu da aka yi da aluminum oxide mai ƙoshin ƙoshin lafiya ko aluminium nitride yana haɗe kai tsaye da ƙarfe tagulla. Ta hanyar dumama zafi mai zafi a 1065 ~ 1085 ° C, ƙarfe na jan ƙarfe yana oxidizes kuma yana yaduwa a yanayin zafi mai zafi tare da yumbu don samar da narke mai eutectic, haɗa jan ƙarfe zuwa yumbu mai yumbu da kuma samar da yumbu mai hade da ƙarfe.
Tsarin tsari don DBC yumbura PCB shine kamar haka:
- Tsaftace kayan danye
- Oxidation
- Sintering
- Gabatarwar magani
- Aikace-aikacen fim
- Bayyanawa (Hotuna)
- Ci gaba
- Etching (lalata)
- Bayan jiyya
- Yanke
- Dubawa
- Marufi
Don haka, menene dalilin etching?
Etching wani tsari ne na yau da kullun wanda ke kawar da duk wani yadudduka na tagulla akan yumbura gaba ɗaya ban da Layer na anti-etch, don haka yana samar da da'ira mai aiki.
Hanyar yau da kullun tana amfani da etching sinadarai. Duk da haka, yayin aikin etching tare da maganin etching na sinadarai, ba wai kawai foil ɗin tagulla ya ƙulla a tsaye ba, amma kuma an yi shi a kwance. A halin yanzu, etching ta gefe a cikin hanyar kwance ba makawa. Akwai ma'anoni daban-daban guda biyu don ma'anar etching F, wasu mutane suna ɗaukar ƙimar zurfin T zuwa faɗin gefe A, wasu kuma suna ɗaukar wata hanya. Wannan labarin yana ƙayyadaddun: rabo daga zurfin T zuwa faɗin gefe A ana kiransa etching factor F, wato F=T/A.
Gabaɗaya, masu kera yumbura na DBC suna buƙatar ma'aunin etching F＞2.
A cikin labarin na gaba, za mu mai da hankali kan tasirin canje-canje a cikin abubuwan da ke haifar da etching yayin kera PCB yumbura.
