Cov Raj Tiv Thaiv Nitride Bonded Silicon Carbide: Cov Ntawv Thov Tseem Ceeb rau Kev Lag Luam Kub Siab

Inyob rau hauv cov chaw ua lag luam hnyav heev—uas muaj qhov kub thiab txias siab, cov khoom siv corrosive, thiab cov hlau molten yaig—kev tiv thaiv cov khoom siv txhim khu kev qha yog qhov tseem ceeb rau kev tswj hwm kev ua haujlwm zoo thiab cov khoom zoo.Cov raj tiv thaiv Nitride bonded silicon carbide (NBSiC), cov khoom siv sib xyaw ua ke zoo uas muaj 70-80% silicon carbide (SiC) thiab 20-30% silicon nitride (Si₃N₄), sawv tawm nrog cov khoom tshwj xeeb: kev tiv taus kub siab txog li 1450 ℃ (1650-1750 ℃ ​​hauv cov huab cua tshwj xeeb), kev tiv taus corrosion / abrasion zoo dua, kev ruaj khov thermal shock zoo heev, thiab kev ua haujlwm thermal siab.Hauv qab no yog lawv cov ntawv thov tseem ceeb, qhia txog lawv daws cov teeb meem tseem ceeb rau cov tuam txhab tsim khoom thoob ntiaj teb li cas.

1. Kev Tiv Thaiv Thermocouple: Kev Saib Xyuas Kub Kom Tseeb Hauv Cov Xwm Txheej Hnyav

Kev tswj qhov kub thiab txias yog qhov tseem ceeb rau kev zoo thiab kev nyab xeeb hauv kev lag luam, thiab cov thermocouples yog cov cuab yeej tseem ceeb rau kev ntsuas qhov kub thiab txias. Txawm li cas los xij, hauv cov cub tawg kub, cov chaw ua hlau uas tsis yog hlau, thiab cov khoom siv kho cua sov, cov thermocouples uas tsis muaj kev tiv thaiv tau yooj yim puas tsuaj los ntawm kev ua kom sov, xeb, lossis kev yaig hlau uas yaj - ua rau kev nyeem tsis raug, lub sijhawm tsis tau npaj tseg, thiab cov nqi kho siab.Cov raj tiv thaiv NBSiC tau tsim los tiv thaiv cov thermocouples, ua rau lawv yog qhov kev xaiv zoo tshaj plaws rau cov xwm txheej saib xyuas qhov kub thiab txias heev.

Lawv cov coefficient thermal expansion qis (4.4 × 10⁻⁶ / ℃) thiab porosity qis (<1%) ua kom muaj kev ruaj khov ntawm qhov ntev thiab tiv thaiv kev xeb los ntawm cov pa roj acidic / alkaline thiab cov hlau molten. Nrog Mohs hardness ~ 9, lawv tiv taus kev hnav los ntawm cov khoom me me.Cov ntawv thov tseem ceeb suav nrog cov chaw ua kom sov steelmaking, cov chaw ua kom sov aluminium melting, thiab cov qhov cub ceramic, qhov twg cov raj NBSiC txuas ntxiv lub neej thermocouple los ntawm 3x lossis ntau dua piv rau cov kev xaiv ib txwm muaj.

2. Kev Smelting & Casting Hlau Uas Tsis Yog Hlau: Kev Tiv Thaiv Cov Txheej Txheem Tseem Ceeb

Cov kev lag luam smelting/casting txhuas, tooj liab, thiab zinc ntsib teeb meem loj: kev yaig hlau molten thiab kev pheej hmoo ntawm kev ua qias tuaj.Cov raj tiv thaiv NBSiC ua haujlwm ob lub luag haujlwm tseem ceeb ntawm no, xa cov kev daws teeb meem tshwj xeeb.

a. Cov Raj Uas Kaw Rau Kev Tiv Thaiv Cov Khoom Siv Cua Sov

Hauv cov cub tawg txhuas, cov khoom cua sov silicon carbide yog qhov tseem ceeb tab sis yooj yim rau kev puas tsuaj ntawm txhuas yaj.Cov raj NBSiC kaw ua haujlwm ua ib qho thaiv, cais cov khoom cua sov ntawm cov hlau molten kom ntev lawv lub neej thiab zam kev ua qias tuaj.Lawv cov thermal conductivity siab ua kom muaj kev hloov pauv cua sov zoo, txo kev siv hluav taws xob. Muaj peev xwm hloov kho tau raws li txoj kab uas hla (txog li 600mm) thiab ntev (txog li 3000mm), lawv hloov kho rau ntau hom cub tawg.

b. Cov Riser rau Aluminium Log Casting

Cov raj xa dej NBSiC qhib (cov raj nqa) pab txhawb kev ntws ntawm cov txhuas uas yaj los ntawm cov cub tawg mus rau cov pwm casting hauv kev tsim cov log txhuas. Nrog rau qhov txias modulus ntawm kev tawg >150MPa thiab kev tiv taus thermal shock zoo heev (nrog rau 100 lub voj voog ntawm 1000 ℃ -chav kub), lawv ua kom muaj kev ntws ruaj khov, txuas ntxiv mus - txo cov qhov tsis zoo ntawm casting (porosity, inclusions) thiab txhim kho cov txiaj ntsig. Tsis zoo li cov raj hlau cam khwb cia, NBSiC tsis ua rau cov txhuas yaj paug, khaws cov khoom huv.