Solder niam: eco-friendly lwm txoj kev? 

Koj hnov ​​cov niam txiv thiab tej zaum yuav pom ib qho kev muab tshuaj txhuam lossis cov tub ntxhais flux. Qhov tseeb yog, nws yog me ntsis ntawm kev lag luam slang uas tau txais fuzzy. Feem ntau, nws yog hais txog lub hauv paus ntawm solder alloy los yog lub hauv paus flux lub tsheb nyob rau hauv ib tug muab tshuaj txhuam - leej niam sib tov txhua yam yog tsim los ntawm. Qhov kev thawb tiag tiag tam sim no tsis yog hais txog cov hlau nws tus kheej, tab sis tag nrho cov kab ke: peb puas tuaj yeem tshem tawm cov khoom phem yam tsis tau tua kev ua haujlwm ntawm kab? Kuv tau pom ntau tus engineers caum daim ntawv ntsuab ntsuab tsuas yog tua los ntawm kev ntuav lossis tombstoneing tom qab.

Lub Alloy Puzzle: Tshaj Lead-dawb

Obviously, SAC305 (Sn96.5Ag3.0Cu0.5) tau los ua tus niam tsis muaj hlau lead. Tab sis hu nws eco-phooj ywg nres ntawm cov ntsiab lus txhuas. Cov nyiaj mining hneev taw yog kev lim hiam, thiab kev ua haujlwm siab (240-260 ° C raug) hlawv ntau lub zog. Peb tau sim qee qhov nyiaj qis thiab txawm tias tsis muaj nyiaj tsis muaj hlau zoo li Sn-Cu-Ni-Ge systems. Tus ntes? Wetting yog qeeb dua. Ntawm lub rooj tsavxwm ntom ntom nrog OSP tiav, koj yuav xav tau qhov hnyav dua los ua kom them nyiaj, uas tom qab ntawd ntsia hlau profile ntawm tag nrho cov khoom siv niam txiv. Nws yog kev sib npaug.

Ib qhov project nrog ib tus neeg siv khoom ua cov khoom lag luam tsom rau tag nrho halogen-dawb thiab tsis muaj nyiaj. Peb siv Sn-Cu-Bi alloy. Ua haujlwm zoo nyob rau hauv reflow, tab sis thaum xaiv soldering ntawm los ntawm-qhov connectors, lub laug niam alloy pom qhov tsis zoo-sau. Lub thermal huab hwm coj sib txawv nqus cua sov tam sim ntawd, ua rau peb cov pob qij txha txias. Peb yuav tsum tweak lub yoj lub lauj kaub kub thiab cov tshuaj tsuag flux, uas nce kev siv nitrogen. Zoo heev rau txo cov pa roj carbon hneev taw. Qhov takeaway? Lwm txoj kev alloy hloov lub nra ntawm ib puag ncig es tsis txhob tshem tawm nws.

Tom qab ntawd muaj tin whiskering. Nrog high-tin alloys, mitigation feem ntau txhais tau tias conformal coatings los yog underfills - ntau chemicals, ntau cov txheej txheem. Ib qho eco-phooj ywg laug niam yuav tsum tsis txhob cia li txav qhov teeb meem mus rau hauv qab. Kuv lean ntawm alloys nrog me me additives xws li npib tsib xee los yog manganese uas suppress whisker loj hlob intrinsically, txawm yog hais tias lawv ntxiv ib tug me me nqi. Nws yog ib lub voj voog ncig saib.

Flux: Qhov Ncauj Ncauj Ncauj ntawm Tsis Huv

Qhov no yog qhov uas eco-phooj ywg daim ntawv lo tau raug tsim txom ntau tshaj. Lub flux tsis huv tsuas yog tus phooj ywg yog tias nws tawm ntawm cov benign residues tiag tiag. Muaj ntau tseem muaj cov activators uas ua corrosive nrog cov av noo. Kuv tau rub cov laug cam tawm ntawm qhov chaw rov qab los nrog kev loj hlob dendritic vim tias cov dej ntsuab ntsuab tau nqus dej noo. Qhov kev hloov pauv tiag tiag yog mus rau bio-based lossis organic acid fluxes tau los ntawm cov khoom xws li pob kws lossis kua. Lawv decomposition byproducts tsis muaj tshuaj lom.

Tab sis kev ua yeeb yam yog huab tais. Cov kua txiv hmab txiv ntoo raws li peb tau sim tau zoo ntub dej ntawm ENIG pads tshiab. Txawm li cas los xij, ntawm cov laug cam nrog me ntsis oxidation lossis teeb meem cia, nws poob sib nrug. Lub qhov rais qhib tau nqaim dhau lawm. Peb xaus nrog nws nrog ib tug hluavtaws activator mus ntaus qhov zoo tshuav nyiaj li cas. Tsis zoo kawg nkaus ntuj, tab sis muaj kev ruaj ntseg ntau tshaj li qhov muaj zog synthetics. Qee lub sij hawm, qhov tsawg-phem kauj ruam rau pem hauv ntej tsuas yog qhov ua tau zoo xwb.

Kev tuav thiab khaws cia kuj hloov. Ib txhia ntawm cov organic fluxes rhiab heev rau UV teeb los yog muaj lub neej txee luv dua. Yog tias lub khw tsis raug qhuab ntuas, cov khoom pov tseg spikes. Kuv nco qab ib tug mid-sized assembler, ib yam dab tsi zoo li HANDAN ZITAI FREWER RAUG UA MOV., Ltd. nyob rau hauv qhov chaw tsim khoom loj, tej zaum yuav muaj qhov ntsuas los tswj cov khoom muag kom nruj. Tab sis rau lub khw me me, kev lwj tuaj yeem tua tau tus nqi-cov txiaj ntsig. Cov https://www.zitaifasteners.com qauv ntawm kev ua tau zoo logistics nyob rau hauv ib tug concentrated industrial puag qhia tau hais tias yuav ua li cas tseem ceeb cov khoom saw ruaj ruaj yog rau kev siv cov kev xaiv.

Pastes thiab Tsheb: Rheology yog txhua yam

Lub tsheb tuav cov hmoov solder thiab flux dictates printability. Ntau cov tshuaj ntsuab ntsuab pauv tawm cov kuab tshuaj raws li cov tsheb rau cov dej-soluble. Suab zoo heev. Tab sis dej evaporates sai dua, hloov lub paste viscosity thaum lub sij hawm luam ntawv ntev. Koj tau txais stencil clogging los yog tsis zoo tso tawm. Peb kawm siv kaw-cartridge systems thiab tswj cov av noo ntawm kab, uas dua, ntxiv zog nyiaj siv ua haujlwm.

Particle loj faib nyob rau hauv cov hmoov solder tseem ceeb heev. Rau kev luam ntawv zoo, koj xav tau Hom 4 lossis 5 hmoov (spheres me dua). Kev tsim cov hmoov nrog lwm cov alloys feem ntau siv cov roj atomization sib txawv. Nitrogen muaj ntau, tab sis qee tus tab tom tshawb nrhiav argon rov ua dua los txo cov khib nyiab. Nws yog cov txheej txheem nthuav dav feem ntau tsis pom, tab sis nws ntxiv rau hauv daim ntawv teev npe ib puag ncig ntawm qhov kawg laug niam muab tshuaj txhuam.

Ib qho kev sim ua tsis tau tiav los rau hauv siab. Peb sim muab tshuaj txhuam nrog lub tsheb tshiab cellulose. Nws luam tawm zoo li npau suav thiab dhau tag nrho cov kev xeem IPC. Tab sis nyob rau hauv reflow, outgassing yog unpredictable. Ntawm cov laug cam uas muaj qhov sib txawv ntawm cov thermal loj, peb tau txais cov voids loj hauv QFNs. Lub tsheb tsis tuaj yeem tso cov volatiles smoothly hla qhov profile. Rov qab mus rau lub lab. Nws qhia tau hais tias kev ua raws li cov rheology ntawm cov ntaub ntawv pov thawj nrog cov ntaub ntawv tshiab yog qhov nyuaj heev.

Cov Txheej Txheem Ua Haujlwm: Tus Nqi Nkaum Zog

Cov khoom siv hauv eco-friendly solder tsis raug ntsuas hauv lub thawv. Nws raug ntsuas nyob rau hauv cov txheej txheem uas tej zaum yuav xav tau ntau dua kub, ntev profiles, los yog inert cua. Yog tias koj tus tshiab halogen-dawb, bio-flux muab tshuaj txhuam yuav tsum muaj 10 ° C siab dua lub ncov lossis lub qhov dej nitrogen-reflow los tiv thaiv oxidation, koj tsuas yog nce lub rooj sib dhos lub zog noj ntau heev. Qhov kev sib pauv ntawd tsis tshua muaj xam nyob rau hauv daim ntawv thov ntsuab.

Peb tau kuaj xyuas tus neeg siv khoom. Hloov mus rau qhov hwm eco-paste txo lawv cov VOC emissions thiab cov nqi kho cov khib nyiab. Txawm li cas los xij, lawv cov nitrogen noj tau nce 30% los tswj cov txiaj ntsig, thiab lawv qhov cub siv zog tau nce li 8%. Cov txiaj ntsig zoo ib puag ncig tseem yog qhov zoo, tab sis slimmer dua li kev lag luam pom zoo. Qhov tiag laug niam ntawm qhov teeb meem yog tag nrho cov txheej txheem kev koom ua ke.

Kev rov ua dua thiab kho dua tshiab kuj tau ua kom yuam kev. Qee qhov lwm cov fluxes tawm cov seem uas nyuaj dua tshem tawm rau kev kho vaj tse. Yog tias koj xav tau cov kuab tshuaj muaj zog los ntxuav lawv, koj rov qab mus rau ib qho square. Tam sim no peb pom zoo kom ua ib qho kev sib txuas tshwj xeeb nrog cov khoom siv sib xws, tsis tshua muaj kev ua haujlwm rov ua dua tshiab los ntawm qhov pib-ib txoj hauv kev.

Sourcing thiab Real-World Viability

Thaum kawg, nws yog hais txog cov khoom siv. Ib tug zoo meej lab-scale laug niam lwm txoj kev tsis muaj txiaj ntsig yog tias koj tsis tuaj yeem tau txais 10,000kg ntawm nws tsis tu ncua. Ntau cov ntaub ntawv tshiab yog los ntawm cov kws tshuaj me me uas tsis tuaj yeem ntsuas lossis ua kom cov khoom sib xws. Rau cov chaw tsim khoom lag luam siab, kev ntseeg siab yog tsis sib tham.

Tias yog vim li cas cov pawg tsim khoom tseem ceeb. Ua nyob rau hauv ib qho chaw zoo li Yongnian District, Handan, uas nyob ib sab ntawm txoj kev thauj loj xws li Beijing-Guangzhou Railway thiab kev nthuav dav, tsis yog hais txog kev xa khoom ceev xwb. Rau ib lub tuam txhab xws li HANDAN ZITAI FREWER RAUG UA MOV., Ltd., nws yog hais txog kev muab tso rau hauv ib lub network ntawm cov neeg muab khoom siv thiab kev thauj khoom uas tuaj yeem txhawb nqa zoo ib yam, loj-loj siv cov khoom tshiab. Yog tias koj tus neeg muag khoom muag nyob ib hnub deb ntawm txoj kev, koj tuaj yeem khiav cov khoom lag luam leaner thiab teb sai dua rau cov txheej txheem tweaks.

Kev txav mus rau kev hloov pauv ntsuab tsis yog kev sib pauv yooj yim. Nws yog ib qho kev rov ua dua tshiab ntawm cov niam txiv lub tswv yim - alloy, flux, tsheb, hmoov, thiab cov txheej txheem uas lawv nyob hauv. Nws yog nkig, tag nrho ntawm kev tsis sib haum xeeb, thiab yuav tsum tau saib tag nrho lub rooj tsavxwm, tsis yog lub thawv ntim khoom. Lub hom phiaj tsis yog purity; nws yog qhov cuam tshuam qis tiag tiag yam tsis muaj kev cuam tshuam qhov kev ntseeg siab uas ua rau txhua yam los ntawm lub fastener mus rau lub server motherboard ua haujlwm.