Nyob rau hauv lub xyoo pua 21st, nrog rau kev loj hlob ntawm science thiab technology, cov ntaub ntawv, lub zog, cov ntaub ntawv, biological engineering tau dhau los ua plaub tug ncej ntawm txoj kev loj hlob ntawm niaj hnub kev sib raug zoo tsim, silicon carbide vim ruaj khov khoom, thermal conductivity, thermal expansion coefficient ntawm me me, me me ceev, zoo hnav tsis kam, siab hardness, siab mechanical zog, tshuaj corrosion kuj thiab lwm yam ntxwv, kev loj hlob sai nyob rau hauv lub teb ntawm cov ntaub ntawv, Dav siv nyob rau hauv ceramic pob bearings, li qub, semiconductor cov ntaub ntawv, gyro, ntsuas ntsuas, aerospace thiab lwm teb.
Silicon carbide ceramics tau tsim txij li xyoo 1960s. Yav dhau los, silicon carbide feem ntau yog siv hauv cov khoom sib tsoo thiab cov khoom siv hluav taws xob. Lub teb chaws thoob plaws ntiaj teb muab qhov tseem ceeb rau kev lag luam ntawm cov ceramics siab heev, thiab tam sim no nws tsis yog tsuas yog txaus siab rau kev npaj cov tsoos silicon carbide ceramics, zus tau tej cov high-tech ceramics tuam txhab tsim sai, tshwj xeeb tshaj yog nyob rau hauv lub teb chaws tsim. Nyob rau hauv xyoo tas los no, ntau theem ceramics raws li SIC ceramics tau tshwm sim ib qho tom qab, txhim kho cov tawv thiab lub zog ntawm cov khoom siv monomer. Silicon carbide lub ntsiab plaub ntawm daim ntawv thov, uas yog, kev ua haujlwm ceramics, cov khoom siv refractory siab heev, abrasives thiab metallurgical raw khoom.
Silicon carbide ceramics muaj kev hnav zoo heev
Silicon carbide ceramics cov khoom no tau kawm thiab txiav txim siab. Qhov hnav tsis kam ntawm silicon carbide ceramics cov khoom no yog sib npaug rau 266 zaug ntawm manganese hlau, sib npaug rau 1741 zaug ntawm cov chromium cam khwb cia hlau. Qhov hnav tsis kam yog qhov zoo heev. Nws tseem tuaj yeem txuag tau nyiaj ntau rau peb. Silicon carbide ceramics tuaj yeem siv tsis tu ncua rau ntau tshaj kaum xyoo.
Silicon carbide ceramics muaj lub zog siab, siab hardness thiab lub teeb yuag
Raws li cov khoom siv tshiab, kev siv cov silicon carbide ceramics cov khoom no muaj zog heev, siab hardness, hnyav kuj yog lub teeb heev, xws li silicon carbide ceramics siv, installation thiab hloov cov saum toj no yuav yooj yim dua.
Sab hauv phab ntsa ntawm silicon carbide ceramic yog du thiab tsis thaiv hmoov
Silicon carbide ceramics cov khoom no raug rho tawm haujlwm tom qab qhov kub thiab txias, yog li cov qauv ntawm silicon carbide ceramics yog qhov ntom ntom, qhov saum npoo yog du, kev zoo nkauj ntawm kev siv yuav zoo dua, yog li siv hauv tsev neeg, kev zoo nkauj yuav zoo dua.
Tus nqi ntawm silicon carbide ceramics yog tsawg
Tus nqi ntawm kev tsim cov silicon carbide ceramics nws tus kheej kuj tsawg, yog li peb tsis tas yuav yuav tus nqi ntawm silicon carbide ceramics raug nqi ntau dhau, yog li rau peb tsev neeg, tab sis kuj tuaj yeem txuag tau nyiaj ntau.
Silicon carbide ceramic daim ntawv thov:
Silicon carbide ceramic pob
Silicon carbide ceramic pob muaj cov khoom siv zoo heev, zoo heev oxidation tsis kam, siab abrasion tsis kam thiab tsis tshua muaj kev sib txhuam coefficient. Silicon carbide ceramic pob kub kub lub zog, cov khoom siv ceramic zoo tib yam ntawm 1200 ~ 1400 degrees Celsius lub zog yuav raug txo kom tsawg, thiab silicon carbide ntawm 1400 degrees Celsius dabtsi yog khoov lub zog tseem khaws cia nyob rau theem siab dua ntawm 500 ~ 600MPa, yog li nws ua haujlwm kub tuaj yeem ncav cuag. 1600 ~ 1700 degrees Celsius.
Silicon carbide composite khoom
Silicon carbide matrix composites (SiC-CMC) tau dav siv nyob rau hauv lub tshav pob ntawm aerospace rau lawv cov kub kub thermal lug vim lawv siab toughness, siab zog thiab zoo heev oxidation kuj. Cov txheej txheem kev npaj ntawm SiC-CMC suav nrog fiber ntau preforming, kev kho kub kub, mesophase txheej, matrix densification thiab tom qab kev kho mob. Lub zog muaj zog carbon fiber ntau muaj lub zog siab thiab zoo toughness, thiab lub cev prefabricated ua nrog nws muaj cov khoom siv zoo.
Mesophase txheej (uas yog, interface thev naus laus zis) yog cov thev naus laus zis tseem ceeb hauv cov txheej txheem kev npaj, kev npaj cov txheej txheem mesophase muaj xws li tshuaj vapor osmosis (CVI), tshuaj vapor deposition (CVD), sol-sol method (Sol-gcl), polymer impregnation cracking method (PLP), qhov zoo tshaj plaws rau kev npaj ntawm silicon carbide matrix composites yog CVI txoj kev thiab PIP txoj kev.
Interfacial txheej cov ntaub ntawv suav nrog pyrolytic carbon, boron nitride thiab boron carbide, ntawm cov uas boron carbide ua ib hom oxidation kuj interfacial txheej tau them ntau thiab ntau xim. SiC-CMC, uas feem ntau yog siv nyob rau hauv oxidation tej yam kev mob rau lub sij hawm ntev, kuj yuav tsum tau mus rau oxidation tsis kam kho, uas yog, ib txheej ntawm tuab silicon carbide nrog ib tug tuab ntawm txog 100μm yog tso rau saum npoo ntawm cov khoom los ntawm CVD txheej txheem. los txhim kho nws qhov kub thiab txias oxidation tsis kam.
Post lub sij hawm: Feb-14-2023