Thaum tham txog kev ua haujlwm thermal ntawm silicon nitride (Si₃N₄), feem ntau cov xim yog muab rau cov qauv siv lead ua lossis sintering. Txawm li cas los xij,cov ntsiab lus oxygenyog ib qho tseem ceeb tshaj plaws uas tsis tshua muaj kev kwv yees tsis zoo cuam tshuam rau silicon nitride thermal zog.
Txawm tias me me hloov pauv hauv qib oxygen tuaj yeem cuam tshuam cov thermal conductivity, thermal stability, thiab thermal shock resistance. Rau cov engineers, ceramic manufacturers, thiab buyers, to taub yuav ua li cas oxygen cov ntsiab lus cuam tshuam rau silicon nitride yog ib qho tseem ceeb rau xaiv cov hmoov zoo thiab ua kom ntseeg tau zoo ib yam nyob rau hauv siab - kub daim ntawv thov.
Qhov twg oxygen tuaj ntawm silicon nitride?
Oxygen hauv silicon nitride feem ntau yog qhiatsis txhob txwmthaum lub sij hawm hmoov ntau lawm thiab ua. Cov peev txheej muaj xws li:
- Residual oxygen nyob rau hauv raw cov ntaub ntawv
- Nto oxidation ntawm silicon nitride hais
- Oxygen tau qhia thaum lub sijhawm sib txuas lossis xa tawm - ua tiav
- Tshem tawm cov huab cua thiab noo noo thaum tuav thiab khaws cia
Nyob rau hauv silicon nitride hmoov, oxygen yog feem ntau tam sim nosilica nto (SiO₂)los yog yaj cov pa oxygen ntawm cov ciam teb. Txawm hais tias me me tsis tuaj yeem zam tau, cov ntsiab lus oxygen ntau dhau tuaj yeem cuam tshuam tsis zoo rau cov khoom siv.
Yuav ua li cas cov ntsiab lus oxygen cuam tshuam rau thermal conductivity
Thermal conductivity nyob rau hauv silicon nitride nyob ntawmphonon thaujlos ntawm kev siv lead ua lattice. High -purity silicon nitride nrog cov pa oxygen tsawg tso cai rau cov cua sov kom txav tau zoo dua los ntawm cov qauv siv lead ua txuas ntxiv.
Thaum cov ntsiab lus oxygen nce ntxiv, cov pa oxygen- cov theem nplua nuj zoo li tsim ntawm cov ciam teb nplej. Cov theem no cuam tshuam phonon txoj hauv kev thiab tawg cov cua sov, ua rautxo thermal conductivity.
Raws li qhov tshwm sim:
- Tsawg-cov pa oxygen silicon nitride ceramics muaj ntau dua thiab ruaj khov thermal conductivity
- High - cov ntaub ntawv oxygen qhia tau hais tias kev hloov pauv cua sov qis dua thiab qis dua qhov kev coj tus cwj pwm thermal
- Rau cov ntawv thov uas yuav tsum tau tswj cov cua kub dissipation, cov ntsiab lus oxygen dhau los ua qhov tseem ceeb.
Kev cuam tshuam ntawm oxygen rau thermal stability thiab siab -tus cwj pwm kub
Cov ntsiab lus oxygen kuj cuam tshuamthermal stabilityntawm qhov kub thiab txias. Oxygen-nplua nuj lis ciam teb theem tuaj yeem muag los yog hnov mob ntawm qhov kub thiab txias, txo cov qauv kev ncaj ncees.
Nyob rau hauv ntev - lub sij hawm siab - qhov kub thiab txias, cov pa ntau dhau tuaj yeem ua kom nrawm:
- Grain ciam teb degradation
- Creep cwj pwm
- Microstructural tsis ruaj khov
Tsawg-oxygen silicon nitride tuav cov ciam teb muaj zog thiab ruaj khov microstructures, txhawb kev txhim kho kev ua tau zoo nyob rau hauv ntev - qhov kub thiab txias ib puag ncig xws li rauv, cav, thiab metallurgical systems.
Cov ntsiab lus oxygen thiab thermal shock kuj
Thermal shock resistance yog ib qho ntawm silicon nitride cov khoom muaj nqis tshaj plaws. Nws nyob ntawm qhov sib npaug ntawm thermal conductivity, thermal expansion, thiab mechanical zog.
Cov ntsiab lus oxygen ntau dhau ua rau cov ciam teb tsis muaj zog, uas tuaj yeem txo qhov kev hloov pauv kub sai. Cov kab nrib pleb feem ntau yuav pib thiab nthuav tawm raws cov pa oxygen- nplua nuj cuam tshuam thaum cua sov lossis txias.
Los ntawm qhov sib txawv, silicon nitride nrog tswj cov pa oxygen tswj hwm kev sib raug zoo ntawm kev sib raug zoo, tso cai rau nws kom nqus tau cov thermal kev nyuab siab zoo dua thiab tiv thaiv kev tawg hauv cov cua sov.
Kev sib raug zoo ntawm cov ntsiab lus oxygen thiab microstructure
Cov ntsiab lus oxygen ncaj qha cuam tshuam raumicrostructurentawm silicon nitride ceramics. Cov pa oxygen siab txhawb kev tsim cov iav lossis amorphous theem ntawm cov ciam teb.
Thaum qee lub sij hawm ciam teb yog qhov tsim nyog rau sintering, cov pa ntau dhau ua rau:
- Nce grain ciam thickness
- Txo cov nplej- rau- cov qoob loo
- Tsawg mechanical thiab thermal kev ua haujlwm
Kev tswj cov pa oxygen tso cai rau cov tuam txhab lag luam kom ua tiav cov txheej txheem microstructure uas sib npaug densification nrog ntev -lub sij hawm thermal ntseeg.
Yog vim li cas oxygen tswj pib nrog hmoov zoo
Lub thermal kev ua tau zoo ntawm tiav silicon nitride ceramics yog txuas nrog rau covzoo ntawm cov hmoov pib. Thaum cov pa oxygen nkag mus rau hauv cov hmoov, nws yog qhov nyuaj rau tshem tawm thaum lub sijhawm ua haujlwm tom qab.
Qhov no yog vim li cas tej manufacturers tsom rau:
- High -cov ntaub ntawv purity
- Tswj synthesis ib puag ncig
- Kev tuav kom zoo kom txo qis oxidation
- Cov dej noo- tiv taus cia thiab ntim khoom
Rau cov neeg yuav khoom, cov ntsiab lus ntawm cov pa oxygen yuav tsum tau txiav txim siab nrog rau purity, particle loj, thiab theem muaj pes tsawg leeg thaum ntsuas silicon nitride hmoov.
Peb txoj hauv kev los tswj cov ntsiab lus oxygen hauv silicon nitride hmoov
Raws li tus kws tshaj lij ntawm cov khoom siv ceramic siab heev, peb muab qhov tseem ceeb rautswj cov pa oxygenthoob plaws hauv silicon nitride hmoov ntau lawm thiab muab khoom.
Peb tswj cov txheej txheem synthesis thiab tshaj tawm - cov kauj ruam ua kom txwv cov oxidation ntawm qhov chaw thiab impurity qhia. Peb cov hmoov yog kuaj rau cov tshuaj muaj pes tsawg leeg thiab ua haujlwm sivkaw ntom nti, ya raws -cov khoom ntimtxhawm rau tiv thaiv cov pa oxygen thiab noo noo tuaj thaum khaws cia thiab thauj mus los.
Los ntawm kev muab cov hmoov silicon nitride nrog ruaj khov thiab tswj cov pa oxygen, peb pab cov neeg siv khoom ua tau zoo thermal conductivity, txhim kho thermal stability, thiab txhim khu kev qha ntev -kev ua tau zoo nyob rau hauv kev thov.
Xaus
Oxygen ntsiab lus plays lub luag hauj lwm txiav txim siab thermal zog ntawm silicon nitride. Cov pa oxygen ntau dhau cuam tshuam rau kev hloov pauv hauv tshav kub, ua kom tsis muaj zog thermal stability, thiab txo qis kev tiv thaiv thermal poob siab, thaum tswj cov pa oxygen txhawb kev txhim khu kev qha thiab kev ua tau zoo.
Kev nkag siab tias cov ntsiab lus ntawm cov pa oxygen cuam tshuam li cas ntawm silicon nitride thermal zog ua rau cov tuam txhab thiab cov neeg yuav khoom xaiv cov khoom zoo dua. Los ntawm kev ua haujlwm nrog cov neeg muag khoom paub txog uas tswj cov pa oxygen ntawm qib hmoov, cov neeg siv khoom lag luam tuaj yeem paub txog cov thermal thiab mechanical zoo ntawm silicon nitride hauv siab - kub thiab siab - daim ntawv thov kev ntseeg siab.
