1. Kev Tshawb Fawb Txog Cov Khoom Siv thiab Cov Txheej Txheem Zoo
1.1 Crystal Chemistry thiab Bonding yam ntxwv
(Silicon Carbide Crucibles)
Silicon carbide (SiC) yog covalent ceramic ua los ntawm silicon thiab carbon atoms teeb tsa hauv tetrahedral latticework, Feem ntau hauv hexagonal (4H, 6H) sau kub (3C) polytypes, txhua qhov qhia tau zoo kawg nkaus atomic bond toughness.
Si– C daim ntawv cog lus, nrog lub zog sib txuas ntawm ib puag ncig 318 kJ/mol, yog ib qhov loj tshaj nyob rau hauv architectural porcelains, muab tshwj xeeb thermal kev ruaj ntseg, kev ruaj khov, thiab tiv taus tshuaj lom neeg.
Qhov no covalent network muaj zog ua rau cov khoom siv nrog lub melting point mus dhau 2700 ° C(sublime), ua rau nws yog ib qho ntawm feem ntau refractory non-oxide ceramics nkag tau rau cov ntawv thov kub.
Tsis zoo li oxide porcelains xws li alumina, SiC khaws lub zog txhua yam thiab nkag mus rau qhov kub thiab txias 1400 ° C, qhov twg ntau cov hlau thiab cov pa ceramics pib soften los yog deteriorate.
Nws txo coefficient ntawm thermal loj hlob (~ 4.0 × 10 ⁻⁶ / K) integrated nrog high thermal conductivity (80– 120 W/(m · K)) enables ceev thermal cycling yam tsis muaj kev puas tsuaj loj, tus cwj pwm tseem ceeb rau kev ua haujlwm crucible.
Cov tuam tsev no yog los ntawm qhov zoo sib npaug electronegativity thiab zoo sib xws atomic qhov ntau thiab tsawg ntawm silicon thiab carbon., uas txhawb nqa qhov ruaj khov heev thiab ntim khoom siv lead ua ntau heev.
1.2 Microstructure thiab Mechanical Resilience
Silicon carbide crucibles feem ntau yog tsim los ntawm sintered los yog tshuaj tiv thaiv-bonded SiC hmoov, nrog microstructure ua si lub luag haujlwm tseem ceeb hauv kev ua haujlwm ntev thiab thermal shock tsis kam.
Sintered SiC crucibles yog tsim los ntawm solid-state los yog kua-theem sintering ntawm kub theem saum toj no 2000 ° C, feem ntau nrog boron los yog carbon additives los txhawb kom densification thiab grain txwv cohesion.
Cov txheej txheem no generates ib tug lig ntom, nplua-grained moj khaum nrog tsawg porosity (
Advanced Ceramics nrhiav tau rau lub Kaum Hlis 17, 2012, yog lub tuam txhab high-tech cog lus rau kev tshawb fawb thiab kev tsim kho, ntau lawm, ua, kev muag khoom thiab kev pabcuam ntawm cov khoom siv ceramic txheeb ze thiab cov khoom lag luam. Peb cov khoom suav nrog tab sis tsis txwv rau Boron Carbide Ceramic Cov Khoom, Boron Nitride Ceramic Khoom, Silicon Carbide Ceramic Khoom, Silicon Nitride Ceramic Khoom, Zirconium Dioxide Ceramic Khoom, lwm. Yog koj txaus siab, thov koj xav tiv tauj peb.
Cim npe: Silicon Carbide Crucibles, Silicon Carbide Ceramic, Silicon Carbide Ceramic Crucibles
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