Lub hom phiaj tseem ceeb tshaj plaws ntawm kev kho PCB saum npoo yog los xyuas kom meej qhov zoo ntawm cov khoom siv hluav taws xob lossis hluav taws xob. Vim tias tooj liab nyob rau hauv cov xwm txheej zoo li muaj nyob rau hauv daim ntawv ntawm oxides nyob rau hauv cov huab cua, nws tsis zoo li yuav tsum tau khaws cia raws li tus thawj tooj liab rau lub sij hawm ntev, yog li nws yuav tsum tau kho nrog tooj liab.
Muaj ntau cov txheej txheem kho PCB nto. Cov khoom siv yog tiaj tus, organic welded tiv thaiv cov neeg ua haujlwm (OSP), tag nrho-board npib tsib xee-plated kub, Shen Jin, Shenxi, Shenyin, tshuaj nickel, kub, thiab electroplating nyuaj kub. Cov tsos mob.
1. Cov cua kub yog tiaj tus (spray tin)
Cov txheej txheem dav dav ntawm cov txheej txheem cua kub theem yog: micro yaig → preheating → txheej vuam → tshuaj tsuag tin → tu.
Cov cua kub yog tiaj tus, tseem hu ua cua kub welded (feem ntau hu ua tin spray), uas yog txheej txheem ntawm txheej txheej melting tin (lead) welded rau ntawm PCB nto thiab siv cua sov los compress cov cua rectification ( tshuab) los tsim. ib txheej ntawm anti-copper oxidation. Nws tseem tuaj yeem muab cov txheej txheem weldability zoo. Tag nrho cov weld thiab tooj liab ntawm cov cua kub tsim ib qho tooj liab-tin hlau interductive compound ntawm kev sib xyaw ua ke. PCB feem ntau yog sinking nyob rau hauv lub melting welded dej; cua riam tshuab cov kua welded ca kua welded ua ntej welded;
Thermal cua tau muab faib ua ob hom: ntsug thiab kab rov tav. Nws feem ntau ntseeg tias hom kab rov tav zoo dua. Nws yog feem ntau cov kab rov tav kub cua rectification txheej yog ib qho zoo sib xws, uas tuaj yeem ua tiav kev tsim khoom.
Qhov zoo: lub sijhawm cia ntev dua; Tom qab lub PCB tiav lawm, qhov saum npoo ntawm cov tooj liab yog ntub tag (tin tau them tag nrho ua ntej vuam); haum rau txhuas welding; cov txheej txheem paub tab, tus nqi qis, tsim nyog rau kev kuaj pom thiab kuaj hluav taws xob
Disadvantages: Tsis haum rau txoj hlua khi; vim qhov teeb meem ntawm qhov chaw tiaj tus, kuj tseem muaj kev txwv ntawm SMT; tsis haum rau kev sib cuag hloov tsim. Thaum txau cov tin, tooj liab yuav yaj, thiab lub rooj tsavxwm yog kub. Tshwj xeeb tshaj yog tuab los yog nyias daim hlau, tin tshuaj tsuag yog txwv, thiab cov khoom lag luam tsis yooj yim.
2, organic weldability tiv thaiv (OSP)
Cov txheej txheem dav dav yog: degreasing -> micro-etching -> pickling -> ntxuav dej ntshiab -> organic txheej -> tu, thiab cov txheej txheem tswj tau yooj yim los qhia cov txheej txheem kho.
OSP yog txheej txheem rau luam tawm Circuit Board (PCB) tooj liab foil nto kho raws li cov cai ntawm RoHS cov lus qhia. OSP luv luv rau Organic Solderability Preservatives, tseem hu ua organic solderability preservatives, tseem hu ua Preflux hauv lus Askiv. Yooj yim muab tso, OSP yog cov tshuaj lom neeg cog qoob loo ntawm daim tawv nqaij ntawm qhov huv, liab qab tooj liab. Cov yeeb yaj kiab no muaj kev tiv thaiv oxidation, kub poob siab, tsis muaj dej noo, tiv thaiv cov tooj liab hauv ib puag ncig tsis muaj xeb (oxidation lossis vulcanization, thiab lwm yam); Txawm li cas los xij, nyob rau tom qab vuam kub kub, cov yeeb yaj kiab tiv thaiv no yuav tsum tau yooj yim tshem tawm los ntawm cov flux sai, yog li ntawd cov tooj liab huv si tuaj yeem ua ke tam sim ntawd nrog cov molten solder hauv lub sijhawm luv luv los ua cov khoom sib koom ua ke.
Qhov zoo: Cov txheej txheem yog qhov yooj yim, qhov saum npoo yog tiaj tus, haum rau vuam tsis muaj hlau lead thiab SMT. Ib qho yooj yim rau rework, yooj yim ntau lawm lag luam, haum rau kab rov tav txoj hauj lwm. Lub rooj tsavxwm yog tsim rau ntau yam kev ua haujlwm (xws li OSP + ENIG). Tus nqi qis, tus phooj ywg environmentally.
Qhov tsis zoo: qhov kev txwv ntawm cov xov tooj ntawm reflow welding (ntau qhov vuam tuab, zaj duab xis yuav raug rhuav tshem, feem ntau 2 zaug tsis muaj teeb meem). Tsis haum rau crimp technology, hlau khi. Kev pom kev pom thiab kev tshawb pom hluav taws xob tsis yooj yim. N2 roj tiv thaiv yuav tsum tau rau SMT. SMT rework tsis haum. Kev xav tau siab cia.
3, tag nrho cov phaj plated npib tsib xee kub
Phaj npib tsib xee plating yog PCB nto tus neeg xyuas pib ua ntej plated nrog ib txheej ntawm npib tsib xee thiab tom qab ntawd plated nrog ib txheej kub, npib tsib xee plating feem ntau yog los tiv thaiv qhov sib txawv ntawm kub thiab tooj liab. Muaj ob hom electroplated npib tsib xee kub: mos kub plating (ntshiab kub, kub nto tsis zoo li ci) thiab tawv kub plating (nqus thiab tawv nto, hnav-resistant, muaj lwm yam xws li cobalt, kub nto zoo li brighter). Mos kub yog siv rau chip ntim kub hlau; Hard kub yog siv nyob rau hauv tsis-welded hluav taws xob interconnections.
Qhov zoo: Lub sijhawm cia ntev> 12 lub hlis. Haum rau kev sib cuag hloov tsim thiab kub hlau khi. Haum rau kev kuaj hluav taws xob
Tsis muaj zog: tus nqi siab dua, tuab dua kub. Electroplated ntiv tes xav tau kev tsim cov hlau txuas ntxiv. Vim hais tias lub thickness ntawm kub tsis zoo ib yam, thaum siv rau vuam, nws yuav ua rau lub embrittlement ntawm solder sib koom vim yog kub tuab heev, cuam tshuam lub zog. Electroplating nto uniformity teeb meem. Electroplated npib tsib xee kub tsis npog ntawm ntug ntawm cov hlau. Tsis haum rau aluminium hlau sib txuas.
4. dab dej kub
Cov txheej txheem dav dav yog: kev ntxuav tu -> micro-corrosion -> preleaching -> ua kom -> electroless nickel plating -> tshuaj kub leaching; Muaj 6 lub tso tsheb hlau luam hauv cov txheej txheem, suav nrog ze li 100 hom tshuaj, thiab cov txheej txheem nyuaj dua.
Sinking kub yog qhwv hauv tuab, hluav taws xob zoo nickel kub alloy ntawm tooj liab, uas tuaj yeem tiv thaiv PCB rau lub sijhawm ntev; Tsis tas li ntawd, nws kuj muaj kev kam rau ib puag ncig uas lwm cov txheej txheem kho saum npoo tsis muaj. Tsis tas li ntawd, dej kub kuj tuaj yeem tiv thaiv kev tawg ntawm tooj liab, uas yuav muaj txiaj ntsig zoo rau kev sib dhos tsis muaj txhuas.
Qhov zoo: tsis yooj yim rau oxidize, tuaj yeem khaws cia rau lub sijhawm ntev, qhov chaw tiaj tus, haum rau vuam zoo sib txawv pins thiab cov khoom siv nrog cov pob qij txha me me. Nyiam PCB board nrog cov nyees khawm (xws li lub xov tooj txawb). Reflow welding tuaj yeem rov ua dua ntau zaus yam tsis tau poob ntau ntawm weldability. Nws tuaj yeem siv los ua cov khoom siv rau COB (Chip On Board) thaiv.
Qhov tsis zoo: tus nqi siab, lub zog vuam tsis zoo, vim tias siv cov txheej txheem uas tsis yog electroplated npib tsib xee, yooj yim kom muaj teeb meem dub disk. Cov nickel txheej oxidizes dhau lub sijhawm, thiab kev ntseeg tau ntev yog qhov teeb meem.
5. Lub dab dej tin
Txij li thaum tag nrho cov tam sim no solders yog tin-raws li, cov tin txheej tuaj yeem sib phim rau txhua yam ntawm cov solder. Cov txheej txheem ntawm sinking tin tuaj yeem tsim lub tiaj tus tooj liab-tin hlau intermetallic tebchaw, uas ua rau lub sinking tin muaj tib yam zoo solderability raws li cov cua kub leveling yam tsis muaj mob taub hau ca teeb meem ntawm huab cua kub leveling; Lub phaj tin tsis tuaj yeem khaws cia ntev dhau lawm, thiab kev sib dhos yuav tsum tau ua raws li qhov kev txiav txim ntawm lub tin sinking.
Qhov zoo: Haum rau kab rov tav kab ntau lawm. Haum rau kev ua cov kab zoo, haum rau cov hlau tsis muaj hlau, tshwj xeeb tshaj yog tsim rau crimping technology. Zoo heev flatness, haum rau SMT.
Qhov tsis zoo: yuav tsum muaj kev cia zoo, zoo dua tsis pub dhau 6 lub hlis, txhawm rau tswj kev loj hlob ntawm tin whisker. Tsis haum rau kev sib cuag hloov tsim. Nyob rau hauv cov txheej txheem ntau lawm, cov txheej txheem welding kuj yog qhov siab, txwv tsis pub nws yuav ua rau cov welding tsis kam zaj duab xis poob. Rau ntau qhov vuam, N2 roj tiv thaiv yog qhov zoo tshaj plaws. Kev ntsuas hluav taws xob kuj yog ib qho teeb meem.
6. Ntxawm nyiaj
Silver sinking txheej txheem yog nruab nrab ntawm cov txheej txheem organic thiab electroless npib tsib xee / kub plating, txheej txheem kuj yooj yim thiab ceev; Txawm tias thaum tshav kub kub, av noo thiab muaj kuab paug, nyiaj tseem muaj peev xwm tswj tau zoo weldability, tab sis yuav poob nws cov luster. Silver plating tsis muaj lub zog zoo ntawm electroless npib tsib xee plating / kub plating vim tias tsis muaj npib tsib xee hauv qab txheej nyiaj.
Qhov zoo: Cov txheej txheem yooj yim, tsim nyog rau kev vuam tsis muaj hlau lead, SMT. Qhov chaw tiaj tus heev, tus nqi qis, haum rau cov kab zoo heev.
Disadvantages: Cov kev cia siab siab, yooj yim rau paug. Vuam lub zog yog qhov ua rau muaj teeb meem (qhov teeb meem micro-cavity). Nws yog ib qho yooj yim kom muaj qhov tshwm sim ntawm electromigration thiab Javani tom phenomenon ntawm tooj liab nyob rau hauv vuam kuj zaj duab xis. Kev ntsuas hluav taws xob kuj yog ib qho teeb meem
7, tshuaj lom neeg nickel palladium
Piv nrog rau nag lossis daus ntawm kub, muaj ib txheej ntxiv ntawm palladium ntawm npib tsib xee thiab kub, thiab palladium tuaj yeem tiv thaiv qhov tshwm sim corrosion tshwm sim los ntawm kev hloov cov tshuaj tiv thaiv thiab ua kom tag nrho kev npaj rau nag lossis daus kub. Kub yog zoo coated nrog palladium, muab ib tug zoo kev sib cuag nto.
Qhov zoo: Haum rau kev vuam tsis muaj hlau lead. Qhov chaw tiaj tiaj, haum rau SMT. Los ntawm qhov tuaj yeem ua npib tsib xee kub. Lub sijhawm khaws cia ntev, cov xwm txheej khaws cia tsis hnyav. Haum rau kev kuaj hluav taws xob. Haum rau kev hloov kev sib cuag tsim. Haum rau txhuas hlau khi, haum rau cov phaj tuab, muaj zog tiv thaiv ib puag ncig.
8. Electroplating nyuaj kub
Txhawm rau txhim kho qhov hnav tsis kam ntawm cov khoom, ua kom cov khoom ntxig thiab tshem tawm thiab electroplating nyuaj kub.
PCB txheej txheem kev kho deg kev hloov pauv tsis loj heev, nws zoo li yog qhov nyob deb, tab sis nws yuav tsum tau muab sau tseg tias kev hloov pauv qeeb yuav ua rau muaj kev hloov pauv loj. Nyob rau hauv rooj plaub ntawm kev hu xov tooj rau kev tiv thaiv ib puag ncig, cov txheej txheem kho saum npoo ntawm PCB yuav twv yuav raug hloov pauv mus rau yav tom ntej.
Post lub sij hawm: Jul-05-2023
