INLub teeb-emitting diode (LED) technologiesKev siv hluav taws xob zoo yog qhov tseem ceeb: overheating txo cov teeb pom kev zoo, ua kom phosphor degradation thiab ua kom lub neej ua haujlwm luv. Ib txoj hauv kev los txhim kho thermal conductivity - kev taw qhiasilicon carbide (SiC)nyob rau hauv tshav kub kis, substrates los yog composites (piv txwv li, Al-SiC, Cu-SiC). Thaum sib pivSiC nrog D50 10 µm ntawm 88% thiab 90% purityqhov sib txawv ntawm 2% impurities cuam tshuam loj heevhloov kub, txij li nws txiav txim siab theem ntawm phonon tawg thiab muaj cov theem thermally tsis ruaj khov.
Tuam txhabZhenAn, muaj30 xyoo ntawm kev paubKev muab khoom ntawm SiC rau thermal composites thiab ntawv pov thawj raws liISO / SGS, piav qhia meej txog qhov muaj pes tsawg leeg muabzoo dua tshav kub dissipation nyob rau hauv LEDs.
1. Vim li cas SiC Thermal Conductivity tseem ceeb rau LEDs
LEDs ua kom muaj cua sov hauv thaj chaw ua haujlwm (p-n hluav taws xob). Yog hais tias kub tsis dissipated sai:
Qhov kev hloov pauv kub nce → cov hluav taws xob ua haujlwm txo qis.
Lub degradation ntawm phosphor thiab sealing compound yog nrawm.
Cov peev txheej ua haujlwm raug txo qis.
SiC muaj cov thermal conductivity siab (nyob ntawm kev hloov kho - txog 120–200 W / (m K)), tab sis nyob rau hauv cov khoom sib xyaw thiab ceramics tus nqi no nyob ntawm:
Purity ntawm crystal lattice.
Particle loj thiab kev faib tawm.
Lub xub ntiag ntawm impurities thiab grain ciam teb uas tawg phonons (tshav kub cab kuj nyob rau hauv ceramics).
2. D50 10 µm SiC - fine filler
D50 10 µm - nruab nrab particle txoj kab uas hla yog 10 µm, uas ua kom zoo packing nyob rau hauv cov hlau los yog ceramic matrices.
Cov khoom me me txo cov thermal tsis kam ntawm qhov sib txuas yog tias muaj kev nyab xeeb zoo thiab huv si.
Thaum kho D50Lub purity ntawm SiC txiav txim siab ntau npaum li cas SiC lattice tswj cov thermal conductivity thiab tsis tsim cov teeb meem ntxiv.
3. Kev cuam tshuam ntawm purity: 88% vs 90%
SiC 88%: ~ 12% impurities (SiO₂, dawb C, oxides ntawm Fe, Al, thiab lwm yam).
SiC 90%: ~ 10% impurities - ntau dua li cov ntshiab silicon carbide hauv ntau.
Yuav ua li cas impurities impair tshav kub hloov
Phonon tawgcov
Thaum tshav kub kub hloov hauv SiC yog ua los ntawm phonons (kev vibrations ntawm cov siv lead ua lattice). Cov impurities thiab qhov tsis xws luag cuam tshuam qhov tsis tu ncua ntawm cov lattice, txo txoj kev tsis pub dawb ntawm phonons →thermal conductivity txo.
Tsim cov theem ntawm tshav kub-resistant nrog tsawg conductivitycov
Piv txwv li, SiO₂ thiab qee cov hlau oxides muaj thermal conductivity 5-10 npaug qis dua SiC. Lawv ua raws li thermal barriers ntawm grain ciam teb.
Nce hauv thermal kuj ntawm matrix interfacecov
Cov impurities hloov lub zog saum npoo ntawm cov khoom, impairing wettability thiab tsim kom muaj zog thermal bond nrog hlau (Al, Cu).
Thermal instabilitycov
Thaum lub sijhawm ua haujlwm ntev ntawm qhov kub thiab txias, impurities tuaj yeem oxidize lossis hnov mob, deteriorating tus qauv thiab nce thermal kuj.
Qhov zoo ntawm SiC 90%
Tsawg phonon tawg - lub lattice huv si muab thermal conductivity ze rau theoretical.
Tsawg thermal barriers - cov ntsiab lus uas tsis muaj impurity txo cov ciam teb uas tsis muaj conductivity.
Kev sib txuas zoo dua nrog cov matrix - Cov nplej ntshiab yog zoo dua wetted, ua kom nruj thermal contact.
Kev ruaj ntseg thaum ua haujlwm - tsawg degradation ntawm thermal conductivity nyob rau lub sij hawm.
4. Kev sib piv ntawm kev hloov hluav taws xob hauv LED- cov khoom
|
Parameter |
SiC 88% |
SiC 90% |
|---|---|---|
|
Cov ntsiab lus impurity |
~ 12% |
~ 10% |
|
Phonon tawg |
Siab dua |
Hauv qab nocov |
|
Thermal conductivity (composite) |
Hauv qab no |
Siab duacov |
|
Thermal tsis kam ntawm ciam teb |
Siab dua |
Hauv qab nocov |
|
Стабильность при T >100 degree |
Nruab nrab |
Siabcov |
|
Kev tshem tawm cua sov los ntawm p-n hlwb |
Tsawg dua |
Ua haujlwm ntau duacov |
|
LED kev pab cuam lub neej |
Tsawg dua |
Ntev duacov |
Xaus:SiC 90% ntawm D50 10 µm yog zoo dua ntawm dissipating tshav kub hauv LEDs, raws li nws muab tsawg phonon scattering, tsawg thermal teeb meem thiab ruaj khov thermal conductivity nyob rau hauv kev khiav hauj lwm tej yam kev mob.
5. Cov lus pom zoo
Rausiab zog LED (lub teeb lub tsheb, txoj kev teeb pom kev zoo, projectors) - xaiv SiC 90% kom txo qis cua sov thiab tswj qhov ci.
INhlau-ceramic substrate(AlSiC, CuSiC) ntshiab muab tub lim tsub kom cov cua sov tshem tawm efficiency thiab txo thermal stress.
Ntawmminiaturization(LEDs rau cov lus qhia, cov khoom siv txawb) zoo dua thermal conductivity ua rau nws muaj peev xwm txo qhov loj ntawm radiators.
Txawm tias me me nce hauv purity txo qhov kev pheej hmoo ntawm cov cua sov hauv zos thiab txuas ntxiv lub neej ntawm LEDs.
6. Case Study
Ib lub chaw tsim khoom ntawm cov hluav taws xob hluav taws xob rau tsheb LED teeb lub taub hau hloov SiC 88% nrog SiC 90% (D50 10 µm) hauv AlSiC-composite:
Lub thermal conductivity ntawm cov khoom sib xyaw tau nce los ntawm15%.
Lub p-n hluav taws kub txo los ntawm 8 degrees hauv lub rooj zaum xeem.
Lub taub hau kev pabcuam lub neej tau nce 20% raws li cov ntaub ntawv kev laus sai.
7. Vim li cas xaiv ZhenAn
30 xyoo ntawm kev paubHauv kev tsim cov SiC rau thermal composites.
Kev tswj kom raug ntawm D50 (± 0.5 µm) thiab purity (88%, 90%, mus txog 99%).
Daim ntawv pov thawjISO / SGS - ruaj khov muaj pes tsawg leeg, tsawg impurities.
Ib tug batch rau AlSiC, CuSiC thiab ceramic substrates.
Cov khoom siv thoob ntiaj teb rau kev lag luam LED, nws pib hluav taws xob thiab hluav taws xob hluav taws xob.
Xaus
NtawmD50 10 µmcovSilicon carbide yog 90% zoo dua ntawm dissipating tshav kub hauv LEDstshaj SiC 88% vim muaj tsawg dua phonon tawg, tsawg thermal thaiv thiab ruaj khov ntawm qhov kub thiab txias. Qhov no tso cai rau koj kom txo tau qhov sib txuas qhov kub thiab txias, ua kom luminous efficiency thiab ntev kev pab cuam lub neej ntawm LED khoom.
Txhawm rau xaiv SiC nrog cov thermal conductivity, hu rau ZhenAn cov kws tshaj lij:
Cov lus nug nquag nug (FAQ)
Q1: Vim li cas cov impurities cuam tshuam cov cua sov hloov hauv SiC?cov
A: Lawv cuam tshuam cov iav siv lead ua, ua rau phonon tawg thiab tsim ib thaj tsam nrog cov thermal conductivity tsawg.
Q2: Puas yog 88% SiC siv tau rau hauv lub zog qis LED?cov
A: Yog, yog tias thermal loads tsawg, tab sis 90% SiC yuav muab kev ruaj ntseg zoo dua thiab kev pab cuam lub neej.
Q3: Puas yog qhov loj me me tseem ceeb tshaj qhov purity rau thermal conductivity?cov
A: Qhov loj me cuam tshuam rau kev ntim khoom thiab kev sib cuag tuag, tab sis purity txiav txim siab SiC lub thermal conductivity thiab thermal barriers.
Q4: Puas yog ZhenAn muab D50 10 um SiC 90%?cov
A: Yog lawm, peb tsim SiC 90% nrog D50 10 µm thiab ntawv pov thawj muaj pes tsawg leeg.
Q5: Kev huv huv cuam tshuam li cas LED lub neej ntev?cov
A: Lub tshuab nqus tsev ntxhua khaub ncaws khaws cov thermal conductivity ntev dua, txo cov thermal degradation.
Vim li cas thiaj xaiv ZhenAn
ruaj khov zoo- Kev tswj hwm nruj ntawm cov khoom siv raw thiab cov txheej txheem tsim khoom, txhawb nqa nrog daim ntawv pov thawj thiab cov ntawv xeem rau txhua pawg.
Tag nrho cov khoom siv metallurgical- silicon carbide, ferroalloys, silicon, hmoov, hlau, manganese thiab lwm yam khoom siv rau metallurgy thiab foundry ntau lawm.
Kev xa khoom raws li kev qhia tshwj xeeb- muaj peev xwm xaiv cov hom, tshuaj muaj pes tsawg leeg, feem thiab hom ntim rau cov txheej txheem thev naus laus zis tshwj xeeb.
International export kev- kev tshaj lij ua haujlwm nrog cov ntawv cog lus, tshuaj xyuas, xa tawm cov ntaub ntawv thiab kev xa khoom.
Kev ntseeg tau ntawm kev muab khoom- Kev tsim cov saw hlau ruaj khov thiab kev npaj khoom xa tuaj rau cov neeg siv khoom mus sij hawm ntev.
Kev sib txuas lus sai- Kev suav cov nqi nrawm, cov lus qhia meej meej thiab cov lus qhia txuj ci rau cov neeg yuav khoom thiab cov kws tshaj lij.
rational kev yuav khoom economics- hais txog qhov ua tau zoo ntawm kev tsim khoom tiag tiag thiab qhov zoo ntawm tus nqi-kev ua tau zoo.
