Kev kub siab ua haujlwm hnav tsis kam siab hardness silicon carbide sib tsoo nruas tuaj yeem kho

(1) Kev kub siab ua haujlwm, me me coefficient ntawm thermal expansion
Silicon carbide yog tsim los ntawm qhov kub thiab txias.Hauv qee qhov chaw kub kub, cov khoom siv yuav tsum muaj lub zog ua haujlwm, thiab ua tau raws li kev ua tiav, thiab silicon carbide ceramics tuaj yeem ua tiav ob lub ntsiab lus.Kev siv siab tshaj plaws ntawm silicon carbide yog li 800 ℃, thiab cov kabmob kub ntawm cov hlau tsuas yog 250 ℃.Los ntawm kev suav ntxhib, qhov nruab nrab thermal expansion coefficient ntawm SIC yog 4.4 × 10-6 / C nyob rau hauv thaj tsam ntawm 25 ~ 1400 ℃.Lub thermal expansion coefficient ntawm SIC yog tsawg dua li ntawm lwm yam abrasives thiab cov ntaub ntawv kub.Piv txwv li, cov coefficient ntawm thermal expansion ntawm corundum yuav siab li (7 ~ 8) × 10-6 / ℃.

(2) High thermal conductivity
Lub siab thermal conductivity ntawm SIC yog lwm yam tseem ceeb ntawm nws lub cev.Lub thermal conductivity ntawm silicon carbide ntau dua li ntawm lwm cov ntaub ntawv refractory thiab abrasives, txog 4 npaug ntawm corundum.Silicon carbide thermal expansion coefficient yog tsawg, siab thermal conductivity, ua rau nws cov khoom nyob rau hauv cov txheej txheem ntawm cua sov thiab txias nyob rau hauv tsawg thermal stress, uas kuj yog silicon carbide khoom thermal shock kuj yog tshwj xeeb yog vim li cas.

(3) Corrosion kuj
Silicon carbide vim nws qhov melting point (decomposition kub), tshuaj inertia thiab thermal shock kuj yog siab, tuaj yeem siv rau ntau yam khoom siv silicon carbide ceramic, xws li cov khoom siv hluav taws xob sib tsoo, qab nthab phaj thiab sagger, zinc smelting muaj ntsug. Lub tog raj kheej distillation rauv nrog silicon carbide cib, aluminium electrolytic cell hauv ob sab phlu, crucible, me me rauv khoom.