Ƙunƙarar wani abu, wanda kuma aka sani da jinkirin harshen wuta, kashe kansa, juriya na harshen wuta, juriya na harshen wuta, juriya na wuta, flammability da sauran konewa, shine kimanta ikon kayan don tsayayya da konewa.

Samfurin kayan wuta yana ƙonewa tare da harshen wuta wanda ya dace da bukatun, kuma an cire harshen wuta bayan ƙayyadadden lokaci.Ana kimanta matakin flammability bisa ga matakin konewar samfurin.Akwai matakai guda uku.Hanyar gwajin kwance na samfurin an raba zuwa FH1, FH2, FH3 matakin uku, hanyar gwajin tsaye ta raba zuwa FV0, FV1, VF2.
Da m PCB allon an raba shi zuwa allon HB da allon V0.

Takardar HB tana da ƙarancin jinkirin harshen wuta kuma galibi ana amfani da ita don alluna mai gefe ɗaya.Kwamitin VO yana da babban jinkirin harshen wuta.Ana amfani da shi galibi don allunan gefe biyu da masu yawa waɗanda suka dace da buƙatun ƙimar wuta na V-1.Wannan nau'in allon PCB ya zama allon FR-4.V-0, V-1, da V-2 maki ne masu hana wuta.

Dole ne allon kewayawa ya zama mai jurewa harshen wuta, ba zai iya ƙonewa a wani yanayin zafi ba, amma ana iya yin laushi kawai.Yanayin zafin jiki a wannan lokacin ana kiransa zafin canjin gilashin (Tg point), kuma wannan ƙimar tana da alaƙa da daidaiton girman allon PCB.

Menene babban Tg PCB da'ira da kuma fa'idodin yin amfani da babban Tg PCB?
Lokacin da zazzabi na babban allon buga Tg ya tashi zuwa wani yanki, madaidaicin zai canza daga "yanayin gilashi" zuwa "jihar roba".Yanayin zafin jiki a wannan lokacin ana kiransa yanayin canjin gilashin (Tg) na allo.A wasu kalmomi, Tg shine mafi girman zafin jiki wanda substrate ke kula da rigidity.

Menene takamaiman nau'ikan allon PCB?
An raba ta da matakin daraja daga ƙasa zuwa sama kamar haka:

94HB - 94VO - 22F - CEM-1 - CEM-3 - FR-4 an kwatanta su daki-daki kamar haka: 94HB: kwali na yau da kullun, ba mai hana wuta ba (mafi ƙanƙanta kayan abu, mutuƙar busa, ba za a iya amfani da shi azaman wutar lantarki) 94V0: Kwali mai ɗaukar harshen wuta (Mold Punching) 22F: Fuskar rabin fiberglass mai gefe guda ɗaya (mutu naushi) CEM-1: Alkalar fiberglass mai gefe guda ɗaya (dole ne a yi hakowa ta kwamfuta, ba a mutu ba) CEM-3: allon gilashin filastik mai gefe biyu ( Sai dai kwali mai gefe biyu shine mafi ƙanƙanci-ƙarshen kayan don allunan gefe biyu. Sauƙaƙan allunan gefe biyu na iya amfani da wannan kayan, wanda shine 5 ~ 10 yuan / murabba'in mita mai rahusa fiye da FR-4.)

FR-4: Gilashin fiberglass mai gefe biyu

Dole ne allon kewayawa ya zama mai jurewa harshen wuta, ba zai iya ƙonewa a wani yanayin zafi ba, amma ana iya yin laushi kawai.Yanayin zafin jiki a wannan lokacin ana kiransa zafin canjin gilashin (Tg point), kuma wannan ƙimar tana da alaƙa da daidaiton girman allon PCB.

Mene ne babban Tg PCB da'ira da kuma fa'idodin yin amfani da babban Tg PCB

Lokacin da zafin jiki ya tashi zuwa wani yanki, substrate zai canza daga "glassy" zuwa "rubbery", kuma zafin jiki a wannan lokacin ana kiransa zafin canjin gilashin (Tg) na farantin.A wasu kalmomi, Tg shine mafi girman zafin jiki (°C) a cikin abin da substrate ke kula da rashin ƙarfi.

Wato, talakawa PCB substrate kayan ba kawai samar da softening, nakasawa, narkewa da sauran abubuwan mamaki a high yanayin zafi, amma kuma nuna wani kaifi ƙi a inji da lantarki halaye (Ina ganin ba ka so ka ga rarrabuwa na PCB allon. kuma duba wannan yanayin a cikin samfuran ku.).

Farantin Tg na gabaɗaya ya fi digiri 130, babban Tg gabaɗaya ya fi digiri 170, kuma matsakaicin Tg yana kusan fiye da digiri 150.

Yawancin allon PCB da aka buga tare da Tg ≥ 170 ° C ana kiran babban allon buga Tg.Yayin da Tg na substrate ya karu, ƙarfin zafi, juriya na danshi, juriya na sinadarai, kwanciyar hankali da sauran halaye na allon buga za a inganta da ingantawa.Mafi girman darajar TG, mafi kyawun juriya na zafin jiki na jirgi, musamman a cikin tsarin da ba shi da gubar, inda manyan aikace-aikacen Tg suka fi yawa.

High Tg yana nufin juriya mai zafi.Tare da saurin haɓaka masana'antar lantarki, musamman samfuran lantarki waɗanda ke wakilta ta kwamfutoci, haɓaka babban aiki da manyan multilayers yana buƙatar juriya mai zafi na kayan aikin PCB azaman garanti mai mahimmanci.Haɓaka da haɓaka fasahar haɓaka haɓakar haɓakar haɓakar haɓakar haɓakawa da SMT da CMT ke wakilta sun sanya PCBs daɗaɗawa ba za su iya rabuwa da goyan bayan babban juriya na juriya ba dangane da ƙaramin buɗaɗɗen buɗewa, wayoyi masu kyau, da bakin ciki.

Saboda haka, bambanci tsakanin janar FR-4 da babban Tg FR-4: yana cikin yanayin zafi, musamman bayan shayar da danshi.
A ƙarƙashin zafi, akwai bambance-bambance a cikin ƙarfin injina, kwanciyar hankali mai girma, mannewa, shayar da ruwa, bazuwar thermal, da haɓakar thermal na kayan.Babban samfuran Tg a bayyane ya fi kyau fiye da kayan aikin PCB na yau da kullun.A cikin 'yan shekarun nan, adadin abokan ciniki da ke buƙatar samar da manyan allon buga Tg ya karu kowace shekara.

Tare da haɓakawa da ci gaba da ci gaba na fasahar lantarki, ana sa sabbin buƙatu akai-akai don kayan aikin da'irar da aka buga, ta haka ne ke haɓaka ci gaba da haɓaka ka'idodin laminate na jan karfe.A halin yanzu, babban ma'auni na kayan aikin substrate sune kamar haka.

① National Standards A halin yanzu, ƙasata ta kasa matsayin ga rarrabuwa na PCB kayan for substrate kayan sun hada da GB/T4721-47221992 da GB4723-4725-1992.Ma'aunin laminate na jan karfe a Taiwan, China shine ma'aunin CNS, wanda ya dogara da ma'aunin JIs na Japan., An sake shi a cikin 1983.
②Wasu ma'auni na ƙasa sun haɗa da: Matsayin JIS na Jafananci, ASTM na Amurka, NEMA, MIL, IPC, ANSI, ka'idodin UL, ka'idodin Bs na Biritaniya, ka'idodin DIN Jamus da VDE, ƙimar NFC da UTE na Faransa, da Ka'idodin CSA na Kanada, Matsayin AS a Australia, FOCT ma'auni a cikin tsohuwar Tarayyar Soviet, ka'idodin IEC na duniya, da dai sauransu.

Masu samar da kayan ƙirar PCB na asali gama gari ne kuma ana amfani da su: Shengyi \ Jiantao \ International, da sauransu.

● Takardun da aka karɓa: protel autocad powerpcb orcad gerber ko ainihin allo kwafin allo, da sauransu.

● Nau'in jirgi: CEM-1, CEM -3 FR4, babban kayan TG;

● Matsakaicin girman allo: 600mm * 700mm (24000mil * 27500mil)

● Kauri na allo: 0.4mm-4.0mm (15.75mil-157.5mil)

● Matsakaicin matakan sarrafawa: 16Layers

● Kauri mai kauri: 0.5-4.0 (oz)

● Haƙuri na kauri da aka gama: +/- 0.1mm (mil 4)

● Samar da juriya mai girma: niƙa na kwamfuta: 0.15mm (mil 6) Mutuwar farantin naushi: 0.10mm (4mil)

● Mafi ƙarancin nisa / tazarar layi: 0.1mm (4mil) Ikon sarrafa nisa na layi: <+-20%

● Matsakaicin diamita na hakowa na ƙãre samfurin: 0.25mm (10mil) Matsakaicin diamita na rami na ƙãre samfurin: 0.9mm (35mil) Haƙuri na ƙãre samfurin rami diamita: PTH: + -0.075mm (3mil) NPTH : +-0.05mm (mil)

● Ƙarfin bangon rami na jan karfe: 18-25um (0.71-0.99mil)

● Mafi ƙarancin tazarar facin SMT: 0.15mm (mil 6)

● Rufin saman: zinari mai nutsewa da sinadarai, fesa tin, Dukan allon zinari ne na nickel-plated (ruwa / zinariya mai laushi), manne siliki shuɗi, da dai sauransu.

● Solder abin rufe fuska a kan allo: 10-30μm (0.4-1.2mil)

● Ƙarfin kwasfa: 1.5N/mm (59N/mil)

● Juriya Solder taurin fim:>5H

● Solder juriya toshe rami iya aiki: 0.3-0.8mm (12mil-30mil)

● Dielectric akai-akai: ε= 2.1-10.0

● Juriya mai juriya: 10KΩ-20MΩ

● Ƙunƙarar yanayi: 60 ohm± 10%

● Girgiza mai zafi: 288 ℃, 10 sec

● Warpage na gama allo: <0.7%

● Aikace-aikacen samfur: kayan sadarwa, kayan lantarki na mota, kayan aiki, tsarin sakawa na duniya, kwamfuta, MP4, samar da wutar lantarki, kayan gida, da dai sauransu.

Dangane da kayan ƙarfafa hukumar PCB, gabaɗaya an raba shi zuwa nau'ikan masu zuwa:
1. Phenolic PCB takarda substrate
Domin irin wannan allo na PCB yana kunshe da tarkacen takarda, katako, da dai sauransu, wani lokaci yakan zama kwali, allon V0, allo mai kare wuta da 94HB, da dai sauransu. Babban kayansa shine takarda fiber na itace, wanda shine nau'in PCB. hada da phenolic guduro matsa lamba.farantin karfe.Irin wannan nau'in takarda ba shi da wuta, ana iya buga shi, yana da ƙananan farashi, ƙananan farashi, da ƙarancin dangi.Sau da yawa muna ganin phenolic takarda substrates kamar XPC, FR-1, FR-2, FE-3, da dai sauransu. Kuma 94V0 nasa ne na harshen wuta-retardant paperboard, wanda ba shi da wuta.

2. Composite PCB substrate
Irin wannan allon foda kuma ana kiransa foda, tare da takarda fiber fiber takarda ko auduga fiber fiber takarda azaman kayan ƙarfafawa, da gilashin fiber gilashi azaman kayan ƙarfafa saman a lokaci guda.Abubuwan biyu an yi su ne da resin epoxy mai hana harshen wuta.Akwai fiber gilashin rabin gilashin guda ɗaya mai gefe guda 22F, CEM-1 da allon gilashin rabin gilashin CEM-3, daga cikinsu CEM-1 da CEM-3 sune mafi yawan abubuwan haɗin ginin ƙarfe na ƙarfe.

3. Gilashin fiber PCB substrate
Wani lokaci shi ma ya zama epoxy jirgin, gilashin fiber jirgin, FR4, fiber jirgin, da dai sauransu Yana amfani da epoxy guduro a matsayin m da gilashin fiber zane a matsayin ƙarfafa abu.Irin wannan allon kewayawa yana da babban zafin aiki kuma yanayin bai shafe shi ba.Ana amfani da irin wannan allon sau da yawa a cikin PCB mai gefe biyu, amma farashin ya fi tsada fiye da na'urar PCB mai hade, kuma kauri na kowa shine 1.6MM.Irin wannan nau'in na'ura ya dace da allunan samar da wutar lantarki daban-daban, manyan allunan kewayawa, kuma ana amfani da su sosai a cikin kwamfutoci, kayan aiki na gefe, da kayan sadarwa.

FR-4

4. Wasu