(Kovar rau Alumina PartTsim los ntawmWintrustek)
I. Txheej txheem cej luam ntawm Kovar
Kovar yog ib qho hlau-nickel-cobalt-raws li expansion alloy uas nws lub ntsiab feature yog hais tias nws thermal expansion coefficient matches ntawm ib co nyuaj tsom iav thiab ceramics (xws li alumina) nyob rau hauv ib tug tej yam kub kub. Qhov no feature ua rau nws yog ib qho tseem ceeb sealing khoom nyob rau hauv electronics ntim, aerospace, lasers, thiab lwm yam lag luam. Nws yog feem ntau siv los fabricate hlau Cheebtsam rau hermetic sealing nrog iav los yog ceramics.
Lub npe "4J" rau precision alloys nyob rau hauv Tuam Tshoj lub teb chaws tus qauv (GB) sawv cev rau alloys muaj expansion yam ntxwv "txog" (J) ib tug tej yam nqi.
II. Kev soj ntsuam ntxaws ntawm Peb Cov Qib Kovar
Commonality: Tag nrho peb yog raws li Fe-Ni-Co thiab muaj kev nthuav dav zoo ib yam li cov iav tawv thiab ceramics. Thermal expansion curves, Curie kub, thiab cov yam ntxwv ntawm cov khoom siv sib txawv heev vim muaj kev hloov pauv me ntsis.
1. 4J29 (the most classic and widely used Kovar)
Hom Composition:Fe-29Ni-17Co, nrog me me ntxiv ntawm deoxidizing ntsiab xws li manganese thiab silicon.
Expansion yam ntxwv: Nruab nrab linear expansion coefficient zoo sib xws nrog DM-308 molybdenum-pawg iav thiab 92-96% alumina ceramics thoob plaws 20-450 ° C ntau yam.
Key Parameters:
Curie kub: Kwv yees li 430 ° C (poob ferromagnetic zog saum toj no kub).
Cov khoom sib txuam: High-alumina ceramics, molybdenum-paj pawg iav.
Kev kho deg: Feem ntau yuav tsum tau npib tsib xee lossis kub plating los txhim kho brazability thiab corrosion kuj.
Cov Kev Siv Tseem Ceeb: Cov raj Microwave, lasers, integrated circuits vaj tse, high-reliability relays, aerospace kaw connectors.
2. 4J33 thiab 4J34 (Txhim Kho Kovar)
Cov alloys no yog cov sib txawv tsim los daws qhov tsis zoo ntawm 4J29 (xws li qhov siab qis-kub expansion coefficients), uas muaj qhov kub siab dua Curie.
Kev sib xyaw ua ke:
4J33: Fe-33Ni-14Co (reduced cobalt, increased nickel).
4J34: Fe-31Ni-15Co (composition intermediate between the two).
Expansion yam ntxwv:Nyob rau hauv chav tsev kub txog li 300 ° C, coefficient ntawm expansion yog me ntsis qis dua 4J29, muab zoo compatibility nrog tej yam tshwj xeeb tsom iav los yog ceramics.
Qhov Zoo Tshaj Plaws - High Curie Kub:
4J29: ~430°C
4J33: ~500°C
4J34: ~480°C
Qhov tseem ceeb:Qhov kub Curie ntau dua ua kom cov khoom tseem tsis sib nqus ntawm qhov kub siab ua haujlwm, tiv thaiv kev cuam tshuam sib nqus nrog cov khoom siv siab, siab precision.
Kev xaiv daim ntawv thov: Tsim nyog rau qhov kub thiab txias ib puag ncig lossis cov ntawv thov hlau nplaum, lossis xaiv raws li kev nthuav dav nkhaus sib piv nrog cov ntaub ntawv tshwj xeeb sealing.
III. Core Advantages ntawm Brazing Kovar nrog Alumina Ceramics
Gas-tight hermetic sealing ntawm Kovar thiab alumina ceramics ntawm brazing yog ib qho tseem ceeb ntawm cov khoom siv hluav taws xob niaj hnub, nrog rau cov txiaj ntsig tseem ceeb hauv qab no:
1. Zoo Tshaj Thermal Expansion Matching (Fundamental Advantage)
Thaum txias los ntawm brazing mus rau chav tsev kub, tib qhov kev sib cog lus ntawm ob cov ntaub ntawv zoo heev txo qhov seem thermal stress ntawm qhov sib koom ua ke. Qhov no ntse tshem tawm ceramic cracking thiab brazing seam fractures, uas ua rau muaj kev ntseeg siab tshaj plaws.
2. Ua kom muaj roj ntau nruj
Helium leak rate nyob rau hauv mature systems feem ntau poob qis dua 1 × 10⁻⁸ Pa·m³ / s rau cov khoom kaw, zoo cais tawm sab nraud thiab cov pa oxygen. Qhov no ua tau raws li qhov yuav tsum tau muaj kev vam khom hnyav rau aerospace, tub rog, thiab lwm yam kev thov siab.
3. Superior Mechanical Strength thiab Structural Integrity
Cov provides muaj zog txhua yam kev txhawb nqa thiab toughness, thaum alumina ceramics muab zoo heev rwb thaiv tsev thiab hardness. Brazing cov ntaub ntawv no ua rau muaj kev sib xyaw ua ke zoo nrog ob qho tib si tiv thaiv thiab ua haujlwm zoo.
4. Cov txheej txheem paub tab thiab muaj kev ntseeg siab
Cov txheej txheem zoo sib xws tau tsim, uas suav nrog ceramic metallization (molybdenum-manganese txheej txheem), nickel plating, sib dhos nrog Kovar Cheebtsam, thiab lub tshuab nqus tsev / tiv thaiv ib puag ncig brazing. Cov txheej txheem yog tswj tau zoo heev, tsim nyog rau kev tsim khoom loj, thiab ua kom muaj txiaj ntsig zoo nrog qhov zoo ib yam.
IV. Cov ntsiab lus sib piv thiab xaiv cov lus pom zoo
Yam ntxwv | 4J29 | 4J33 | 4J34 | Lub ntsiab zoo ntawm brazing nrog alumina ceramic |
Cov yam ntxwv tseem ceeb | Classic thiab ntau yam, muab qhov zoo tshaj plaws tus nqi-kev ua tau zoo piv | High Curie point, me ntsis qis qis-kub nthuav dav | Kev Ua Haujlwm Kev Lag Luam | 1. Precise thermal expansion txuam |
Kev sib piv zoo | 92-96% Al2O3 ceramics | Tshwj xeeb iav/ceramic, tsis haum rau magnetic teb | Tshwj xeeb iav/ceramic | 2. Tsis tshua muaj residual kev nyuaj siab |
Curie kub | ~430°C | ~500°C | ~480°C | 3. High airtightness ntsuas |
Cov lus pom zoo xaiv | Qhov kev xaiv zoo tshaj rau sealing feem ntau cov pa alumina ceramics | Kev khiav hauj lwm kub, sib nqus-rhiab heev, tshwj xeeb txuam yuav tsum | Tshwj xeeb thermal expansion txuam yuav tsum tau | 4. Superior mechanical zog thiab kev ntseeg siab |
Mature manufacturing txheej txheem | Siab tshaj | Siab | Siab | 5. Txheem txheej txheem txheej txheem |
Ⅴ. Xaus
Hauv tsev neeg Kovar, 4J29 yog tus qauv thiab cov khoom pom zoo rau brazing high-alumina ceramics, muab qhov sib npaug ntawm kev ua tau zoo, tus nqi, thiab kev cia siab. 4J33/34 yog kev txhim kho kev ua haujlwm rau cov ntawv thov tshwj xeeb uas xav tau kev ua haujlwm siab dua lossis cov yam ntxwv tsis sib xws.Lub brazing ntawm Kovar nrog alumina ceramics, uas tau txais kev txhawb nqa los ntawm lawv cov thermal expansion txuam, tau dhau los ua tus qauv kev lag luam rau kev ntim khoom ntawm cov khoom siv hluav taws xob thiab optoelectronic siab.
