Cov khoom siv uas tsis yog xim hlau muaj xws li silicon thiab nitrogen, silicon nitride (Si3N4) kuj yog cov khoom siv ceramic zoo tshaj plaws nrog kev sib xyaw ua ke ntawm txhua yam, thermal, thiab hluav taws xob. Tsis tas li ntawd, piv rau lwm cov ceramics feem ntau, nws yog ib qho kev ua haujlwm siab ceramic nrog cov thermal expansion coefficient uas muaj cov thermal shock kuj zoo heev.
Nta
Vim nws tsis tshua muaj thermal expansion coefficient, cov khoom muaj ib tug heev thermal shock kuj thiab zoo puas toughness. Si3N4 workpieces tiv taus kev cuam tshuam thiab kev poob siab. Cov workpieces no tuaj yeem ua haujlwm ntev txog 1400 ° C thiab tiv taus cov tshuaj lom neeg, cov teebmeem corrosive, thiab cov hlau tshwj xeeb xws li txhuas, nrog rau cov kua qaub thiab cov tshuaj alkaline. Lwm qhov tshwj xeeb yog nws qhov ntom ntom. Nws muaj qhov ntom ntom ntom ntawm 3.2 txog 3.3 g / cm3, uas yog ze li lub teeb li txhuas (2.7 g / cm3), thiab nws muaj max dabtsi yog khoov zog ntawm ≥900 MPa.
Tsis tas li ntawd, Si3N4 yog tus cwj pwm los ntawm kev ua haujlwm siab hnav thiab tshaj qhov kub-kub ntawm cov hlau feem ntau, xws li qhov kub thiab txias zog thiab nkag mus. Nws muaj kev sib xyaw ua ke zoo tshaj plaws ntawm kev nkag siab thiab oxidation tsis kam thiab ua haujlwm zoo tshaj qhov muaj peev xwm kub ntawm feem ntau ntawm cov hlau. Ua tsaug rau nws cov thermal conductivity tsawg thiab muaj zog hnav tsis kam, nws tuaj yeem tiv taus qhov xwm txheej hnyav tshaj plaws hauv cov ntawv thov kev lag luam tshaj plaws. Ntxiv mus, silicon nitride yog ib qho kev xaiv zoo thaum yuav tsum muaj qhov kub thiab txias thiab siab load.
Cov khoom
● High puas toughness
● Zoo flexural zog
● Tsis tshua muaj ceev
● Zoo kawg li muaj zog thermal shock kuj
● Ua haujlwm kub hauv oxidizing cua
Txoj kev tsim khoom
Tsib txheej txheem ntau yam siv los ua silicon nitride-ua rau cov ntaub ntawv sib txawv me ntsis thiab kev siv.
SRBSN (cov tshuaj tiv thaiv-bonded silicon nitride)
GPSN (Gas siab sintered silicon nitride)
HPSN (kub-pressed silicon nitride)
HIP-SN (kub isostatically nias silicon nitride)
RBSN (reaction-bonded silicon nitride)
Ntawm cov tsib, GPSN yog txoj kev siv ntau tshaj plaws ntawm kev tsim khoom.
Piv txwv daim ntawv thov
Pob thiab Rolling Elements rau Lub Teeb
Vim lawv cov pob txha tawg zoo thiab cov khoom zoo tribological, silicon nitride ceramics yog qhov tsim nyog rau kev siv los ua cov pob thiab dov cov ntsiab lus rau lub teeb, tsis tshua muaj neeg bearings, hnyav-duty ceramic forming cov cuab yeej, thiab cov khoom siv tsheb loj heev. Tsis tas li ntawd, cov txheej txheem vuam siv cov ntaub ntawv muaj zog thermal shock resistance thiab high-temperature resistance.
Kev Siv Kub Kub
Tsis tas li ntawd, nws tau ntev tau ua hauj lwm nyob rau hauv high-temperature daim ntaub ntawv. Qhov tseeb tias nws yog ib qho ntawm ob peb cov ntaub ntawv monolithic ceramic uas tuaj yeem tiv taus huab cua kub thiab kub gradients tsim los ntawm hydrogen / oxygen foob pob hluav taws cav.
Automotive Kev Lag Luam
Tam sim no, cov khoom siv silicon nitride yog siv feem ntau hauv kev lag luam tsheb hauv kev siv rau lub cav qhov chaw thiab cov khoom siv cav, xws li turbochargers rau qis inertia thiab txo lub cav lag thiab emissions, glow plugs rau kev pib sai dua, tso pa roj tswj li qub kom nrawm dua, thiab rocker arm pads rau roj cav kom txo qis hnav.
Electronics Kev Lag Luam
Vim nws cov khoom siv hluav taws xob sib txawv, hauv kev siv microelectronics, silicon nitride tau nce siv los ua cov khoom siv hluav taws xob thiab tshuaj tiv thaiv hauv kev tsim cov kev sib xyaw ua ke rau kev ntim khoom zoo. Silicon nitride yog siv los ua ib txheej passivation nrog lub siab diffusion barrier tiv thaiv sodium ions thiab dej, uas yog ob qho tseem ceeb ua rau corrosion thiab instability nyob rau hauv microelectronics. Hauv cov khoom siv hluav taws xob rau cov khoom siv analog, cov khoom siv kuj tseem siv los ua hluav taws xob insulator ntawm polysilicon txheej.
Xaus
Silicon nitride ceramics yog cov khoom siv hluav taws xob. Txhua hom ntawm cov ceramic no muaj cov yam ntxwv tshwj xeeb uas ua rau nws muaj txiaj ntsig zoo hauv ntau qhov chaw. Nkag siab txog ntau yam ntawm silicon nitride ceramics ua rau nws yooj yim los xaiv qhov zoo tshaj plaws rau daim ntawv thov.
