Silicon Carbide Ceramic yog dab tsi thiab nws cov yam ntxwv

Silicon carbide ceramics yog cov tebchaw tsim los ntawm cov pa roj carbon thiab silicon dioxide (SiO ₂) nyob rau hauv qhov kub thiab txias. Silicon carbide (SiC) yog ib qho kev sib xyaw nrog cov khoom siv muaj zog, nrog rau ionic Si-C daim ntawv cog lus tsuas yog kwv yees li 12%. Yog li ntawd, nws muaj siab hardness, thermal stability, corrosion kuj, zoo heev oxidation kuj, hnav tsis kam, thiab tsis tshua muaj kev sib txhuam coefficient.
Silicon carbide ceramics tsis tsuas yog muaj cov cuab yeej zoo heev ntawm chav tsev kub, xws li siab khoov lub zog thiab zoo corrosion kuj, tab sis kuj muaj qhov zoo tshaj plaws kub-kub txhua yam khoom (xws li lub zog, creep resistance, thiab lwm yam) ntawm cov ntaub ntawv ceramic paub. Lub zog kub ntawm cov ntaub ntawv sintered los ntawm kub nias, pressureless sintering, thiab kub isostatic nias tuaj yeem khaws cia txog li 1600, ua rau lawv cov khoom siv kub kub zoo tshaj plaws ntawm cov ntaub ntawv ceramic. Tsis tas li ntawd, cov thermal conductivity ntawm silicon carbide ceramics kuj tseem siab, thib ob tsuas yog beryllium oxide ceramics hauv ceramics.
Kev npaj cov txheej txheem ntawm silicon carbide ceramics feem ntau suav nrog cov tshuaj tiv thaiv sintering, txhim kho sintering, txau txoj kev, thiab kub nias txoj kev. Cov txheej txheem txheej txheem no muaj lawv tus yam ntxwv, thiab cov txheej txheem npaj tsim nyog tuaj yeem raug xaiv raws li qhov xav tau sib txawv thiab daim ntawv thov scenarios.
Cov yam ntxwv tseem ceeb ntawm silicon carbide ceramics muaj xws li:
1. Kev ruaj ntseg ntawm qhov kub thiab txias: Nws tuaj yeem tswj tau zoo txhua yam muaj zog thiab tshuaj lom neeg ruaj khov nyob rau hauv qhov kub thiab txias ib puag ncig, thiab tuaj yeem ua haujlwm ntawm qhov kub txog li 1600 lossis siab dua (siab tshaj 1400 hauv cov xwm txheej tshwj xeeb), ua rau nws yog qhov kev xaiv zoo tshaj plaws rau cov khoom siv hluav taws xob kub. .
2. Siab zog thiab hardness: Nws muaj lub zog compressive siab, tensile lub zog, thiab hardness, nrog ib tug Mohs hardness ze rau qib 9, thib ob tsuas yog pob zeb diamond, thiab zoo heev hnav tsis kam.
3. Kev ua haujlwm zoo thermal: siab thermal conductivity thiab qis coefficient ntawm thermal expansion, uas txhais tau hais tias nws muaj qhov zoo ntawm qhov ruaj khov nyob rau hauv qhov kub thiab txias thiab tsis yooj yim deformed vim thermal expansion thiab contraction.
4. Corrosion kuj thiab oxidation tsis kam: Nws muaj kev tiv thaiv zoo rau feem ntau acidic thiab alkaline xov xwm thiab ntau oxidizing cua.
5. Kev ua tau zoo ntawm hluav taws xob: Silicon carbide yog cov khoom siv semiconductor nrog cov khoom siv hluav taws xob tshwj xeeb, uas tuaj yeem siv los ua cov rwb thaiv tsev lossis cov khoom siv hluav taws xob hauv cov khoom siv hluav taws xob hluav taws xob thiab qhov chaw kub kub.
6. Cov qauv pore: Silicon carbide ntxeem tau ceramics tuaj yeem npaj rau hauv cov qauv nrog cov porosity siab, uas tuaj yeem siv rau ntau yam kev siv xws li pom, suab rwb thaiv tsev, thiab thermal rwb thaiv tsev.
Silicon carbide ceramics yog dav siv nyob rau hauv high-temperature bearings, bulletproof plates, nozzles, aviation engine Cheebtsam, automotive kev kho tshuab, hnav-resistant Cheebtsam (xws li twj thiab li qub, pipelines), high-temperature furnace Cheebtsam, electronics Cheebtsam (xws li. raws li high-temperature semiconductor pab kiag li lawm), high-temperature corrosion-resistant Cheebtsam, thiab cov khoom siv hluav taws xob nyob rau hauv high-temperature thiab high-frequency range vim lawv cov khoom tshwj xeeb. Hauv kev lag luam chemical thiab metallurgical, cov ntaub ntawv silicon carbide feem ntau yog siv los ua cov kab hluav taws xob lossis cov crucibles los tiv thaiv kev yaig ntawm cov hlau molten, slag, thiab alkali hlau. Tsis tas li ntawd, silicon carbide ceramics kuj muaj cov ntawv thov tseem ceeb hauv lub zog, kev tiv thaiv ib puag ncig, thiab kev lag luam kiln.
Hauv cov ntsiab lus, silicon carbide ceramics yog cov khoom siv ceramic uas muaj kev ua haujlwm siab nrog rau kev thov dav dav, thiab xav tias yuav siv rau ntau qhov chaw yav tom ntej.