Silicon nitride, feem ntau hu uaSib 3N4, yog ib qho tseem ceeb tshaj plaws uas tsis yog - oxide ceramic cov ntaub ntawv siv nyob rau hauv kev lag luam siab heev. Nws lub koob npe nrov yog qhov siab -kev ua tau zoo ceramic yog tsim los ntawm kev ua tib zoo sib npaug ntawm cov khoom uas tso cai rau nws ua tau zoo dua ntau yam khoom siv hauv cov xwm txheej hnyav.
Ntau dua li ua tau zoo hauv ib cheeb tsam nkaus xwb, Si₃N₄ ua kemechanical zog, thermal stability, tshuaj tiv thaiv, thiab hnav ua haujlwmnyob rau hauv ib qho khoom siv system. Kev nkag siab txog cov khoom tseem ceeb ntawm Si₃N₄ yog qhov tseem ceeb rau cov kws tsim khoom, cov chaw tsim khoom, thiab cov neeg yuav khoom uas xav tau cov ntaub ntawv muaj peev xwm xa cov khoom siv tau ntev - kev ua tau zoo.
Mechanical zog thiab tawg toughness
Ib qho tseem ceeb tshaj plaws Si₃N₄ cov khoom yog nwssiab mechanical zog, uas tseem nyob ruaj khov txawm nyob rau qhov kub siab. Cheebtsam ua los ntawm silicon nitride tuaj yeem tiv taus cov khoom hnyav thiab rov ua dua txhua yam kev ntxhov siab yam tsis muaj deformation tseem ceeb.
Tsis zoo li ntau cov tsoos ceramics, Si₃N₄ kuj nthuav tawmzoo tawg toughness. Qhov no txo qhov kev pheej hmoo ntawm kev ua tsis tiav tam sim ntawd thiab ua rau nws tsim nyog rau kev siv cov qauv xws li cov kabmob, cov ntsaws ruaj ruaj, thiab cov khoom siv kho tshuab raug kev co thiab kev cuam tshuam.
Thermal stability thiab siab -kev ua haujlwm kub
Thermal stability yog cov cuab yeej cuab tam ntawm Si₃N₄. Silicon nitride tswj nws cov neeg kho tshuab kev ncaj ncees ntawm qhov kub thiab txias uas cov hlau yuav soften los yog poob zog.
Tsis tas li ntawd, Si₃N₄ muaj ibTsawg thermal expansion coefficient, cia nws tiv thaiv tawg thaum lub sij hawm kub hloov ceev. Qhov zoo tshaj plaws thermal shock kuj ua rau silicon nitride yog cov khoom siv rau cov khoom siv hluav taws xob, lub cav, thiab siab -kub kev lag luam.
Thermal conductivity thiab kev tswj cua sov
Si₃N₄ muabnruab nrab thermal conductivity, feem ntau siab dua ntau oxide ceramics tab sis qis dua hlau. Qhov kev coj tus cwj pwm zoo li no tso cai rau kev faib hluav taws xob zoo yam tsis muaj kev qhia txog kev ntxhov siab ntau dhau.
Cov cuab yeej no tseem ceeb tshwj xeeb tshaj yog nyob rau hauv cov ntawv thov uas yuav tsum tau tswj xyuas qhov kub thiab txias, xws li cov khoom siv hauv tsheb, metallurgy systems, thiab precision mechanical parts exposed to temperature gradients.
Hnav thiab abrasion kuj
Lwm qhov tseem ceeb Si₃N₄ cov cuab yeej yog nwszoo heev hnav thiab abrasion kuj. Silicon nitride ceramics ua tau zoo nyob rau hauv ib puag ncig uas muaj kev sib txhuam, zawv zawg sib cuag, thiab abrasive hais.
Qhov kev hnav tsis kam ua rau lub neej ua haujlwm ntev dua, txo qis txij nkawm, thiab txhim kho kev ua haujlwm zoo. Vim li ntawd, Si₃N₄ tau siv dav hauv cov kabmob, cov cuab yeej txiav, thiab hnav- cov khoom tiv thaiv.
Tshuaj thiab oxidation kuj
Si₃N₄ qhia tau tias muaj zogtshuaj stabilitynyob rau hauv ib puag ncig hnyav. Nws tiv taus corrosion los ntawm ntau cov hlau molten, slags, thiab txhoj puab heev industrial cua.
Silicon nitride kuj muaj qhov zoo oxidation tsis kam ntawm qhov kub thiab txias piv nrog ntau yam tsis yog -oxide ceramics. Cov tshuaj tiv thaiv kab mob no txhawb kev ua haujlwm ntev - lub sijhawm ua haujlwm hauv metallurgy, refractory, thiab siab -kev ua haujlwm kub.
Qhov ceev thiab lub zog-rau- hnyav kom zoo dua
Piv nrog rau ntau cov hlau, Si₃N₄ muaj ib tugkuj tsawg ceev, ua rau muaj zog zoo heev - rau - qhov hnyav piv. Cov cuab yeej no muaj txiaj ntsig tshwj xeeb hauv tsheb, lub zog, thiab siab - kev siv tshuab nrawm.
Txo cov khoom hnyav thaum tuav lub zog pab txhim kho lub zog ua haujlwm, txo qis inertia, thiab txhim kho kev ua haujlwm tag nrho.
Vim li cas Si₃N₄ cov khoom nyob ntawm cov hmoov zoo
Thaum silicon nitride paub txog nws cov khoom zoo,kev ua tau zoo tiag tiag nyob ntawm cov hmoov zoo thiab kev tswj xyuas kev ua haujlwm. Cov yam ntxwv xws li particle loj faib, theem muaj pes tsawg leeg (alpha/beta ratio), purity, thiab oxygen cov ntsiab lus tag nrho cov cuam tshuam tus cwj pwm zaum kawg ceramic.
Cov hmoov tsis zoo tuaj yeem ua rau txo qis zog, ua haujlwm thermal tsis zoo, lossis kev pabcuam lub neej tsis muaj kev cia siab. Qhov no yog vim li cas cov tuam txhab muaj kev paub txog qhov tseem ceeb ntawm kev muab cov khoom siab - zoo Si₃N₄ hmoov nrog cov lus qhia ruaj khov.
Peb qhov kev paub dhau los hauv kev muab cov hmoov zoo - Si₃N₄ zoo
Raws li tus kws tshaj lij ntawm cov khoom siv ceramic siab heev, peb tsom rau kev muabSi₃N₄ hmoov nrog cov khoom zoo ib yam thiab txhim khu kev qha.
Los ntawm kev tswj hwm ntau lawm thiab kev tswj xyuas nruj, peb ua kom ruaj khov tshuaj muaj pes tsawg leeg, tswj cov yam ntxwv ntawm cov khoom, thiab qib impurity tsawg. Peb cov hmoov silicon nitride tau ntim rau hauvnoo-tiv taus, kis kab mob- tiv thaiv ntimlos tiv thaiv cov khoom ncaj ncees thaum khaws cia thiab thauj.
Los ntawm kev txhawb nqa cov neeg siv khoom nrog cov ntaub ntawv tsim nyog es tsis yog cov khoom lag luam, peb pab txo cov kev pheej hmoo ntawm kev ua haujlwm thiab txhim kho lub sijhawm ntev - kev ntseeg siab ntau lawm.
Xaus
Si₃N₄ cov khoom- xws li cov neeg kho tshuab siab, zoo thermal stability, tswj thermal conductivity, hnav tsis kam, thiab tshuaj lom neeg muaj zog-ua silicon nitride yog ib qho tseem ceeb tshaj plaws -cov ntaub ntawv ceramic hauv kev lag luam niaj hnub no.
Kev nkag siab txog cov khoom no tso cai rau cov tuam txhab thiab cov neeg yuav khoom xaiv cov ntaub ntawv uas ua tau raws li qhov xav tau ntawm kev xav tau. Los ntawm kev ua haujlwm nrog cov neeg siv khoom paub txog uas ua kom cov hmoov zoo sib xws thiab kev txhawb nqa kev tshaj lij, cov neeg siv khoom lag luam tuaj yeem paub txog qhov zoo ntawm Si₃N₄ hauv huab thiab siab - daim ntawv thov kev ntseeg siab.tiv tauj peb]
