Nyob rau hauv lub xyoo pua 21st, nrog rau kev txhim kho ntawm kev tshawb fawb thiab thev naus laus zis, cov ntaub ntawv, lub zog, cov ntaub ntawv, kev tsim kho biological tau dhau los ua plaub lub hauv paus ntawm kev txhim kho ntawm kev tsim khoom niaj hnub no, silicon carbide vim muaj cov khoom siv tshuaj lom neeg ruaj khov, kev ua haujlwm thermal siab, coefficient nthuav dav thermal ntawm me me, qhov ceev me me, kev hnav tsis kam zoo, kev nyuaj siab, lub zog kho tshuab siab, kev tiv thaiv tshuaj lom neeg corrosion thiab lwm yam ntxwv, kev loj hlob sai hauv thaj chaw ntawm cov ntaub ntawv, Siv dav hauv cov pob ceramic bearings, li qub, cov ntaub ntawv semiconductor, gyro, ntsuas ntsuas, aerospace thiab lwm yam teb.
Cov khoom siv ua los ntawm silicon carbide tau tsim tawm txij li xyoo 1960. Yav dhau los, silicon carbide feem ntau yog siv rau hauv cov khoom siv sib tsoo thiab cov khoom siv refractory. Cov teb chaws thoob plaws ntiaj teb muab qhov tseem ceeb rau kev lag luam ntawm cov khoom siv ceramic siab heev, thiab tam sim no nws tsis tsuas yog txaus siab rau kev npaj cov khoom siv silicon carbide ib txwm muaj, kev tsim cov khoom siv ceramic siab heev tau tsim kho sai dua, tshwj xeeb tshaj yog nyob rau hauv cov teb chaws tsim kho. Nyob rau hauv xyoo tas los no, ntau theem ceramics raws li SIC ceramics tau tshwm sim ib qho tom qab ib qho, txhim kho qhov tawv thiab lub zog ntawm cov ntaub ntawv monomer. Silicon carbide plaub qhov chaw tseem ceeb ntawm daim ntawv thov, uas yog, cov khoom siv ceramic ua haujlwm, cov khoom siv refractory siab heev, abrasives thiab cov khoom siv hlau.
Silicon carbide ceramics muaj kev tiv thaiv zoo heev
Cov khoom no tau raug kawm thiab txiav txim siab txog silicon carbide ceramics. Qhov kev tiv thaiv kev hnav ntawm cov khoom no yog sib npaug rau 266 zaug ntawm manganese hlau, sib npaug rau 1741 zaug ntawm cov hlau cam khwb cia chromium siab. Qhov kev tiv thaiv kev hnav zoo heev. Nws tseem tuaj yeem txuag peb ntau nyiaj. Silicon carbide ceramics tuaj yeem siv tas mus li ntau dua kaum xyoo.
Silicon carbide ceramics muaj lub zog siab, siab hardness thiab lub teeb yuag
Ua ib hom khoom tshiab, kev siv cov khoom siv silicon carbide ceramics no muaj zog heev, tawv heev, thiab qhov hnyav kuj sib dua, xws li silicon carbide ceramics siv, kev teeb tsa thiab hloov pauv ntawm cov saum toj no yuav yooj yim dua.
Phab ntsa sab hauv ntawm silicon carbide ceramic yog du thiab tsis thaiv hmoov
Cov khoom siv silicon carbide ceramics no raug hlawv tom qab kub siab, yog li cov qauv ntawm silicon carbide ceramics yog qhov ntom ntom, qhov saum npoo du, qhov zoo nkauj ntawm kev siv yuav zoo dua, yog li siv hauv tsev neeg, qhov zoo nkauj yuav zoo dua.
Tus nqi ntawm silicon carbide ceramics yog qis
Tus nqi ntawm kev tsim cov khoom siv silicon carbide ceramics nws tus kheej yog qhov tsawg dua, yog li peb tsis tas yuav yuav tus nqi ntawm silicon carbide ceramics kim heev, yog li rau peb tsev neeg, tab sis kuj tuaj yeem txuag tau nyiaj ntau.
Daim ntawv thov silicon carbide ceramic:
Pob zeb silicon carbide ceramic
Pob zeb silicon carbide ceramic muaj cov khoom siv zoo heev, tiv taus oxidation zoo heev, tiv taus kev sib txhuam siab thiab coefficient sib txhuam qis. Pob zeb silicon carbide ceramic muaj zog kub siab, cov khoom siv ceramic ib txwm muaj ntawm 1200 ~ 1400 degrees Celsius lub zog yuav raug txo qis heev, thiab silicon carbide ntawm 1400 degrees Celsius lub zog khoov tseem khaws cia ntawm qib siab dua ntawm 500 ~ 600MPa, yog li nws qhov kub ua haujlwm tuaj yeem ncav cuag 1600 ~ 1700 degrees Celsius.
Cov khoom siv sib xyaw ua ke silicon carbide
Cov khoom sib xyaw ua ke silicon carbide matrix (SiC-CMC) tau siv dav hauv kev lag luam aerospace rau lawv cov qauv kub kub vim lawv cov tawv siab, lub zog siab thiab kev tiv thaiv oxidation zoo heev. Cov txheej txheem npaj ntawm SiC-CMC suav nrog fiber preforming, kev kho kub siab, mesophase txheej, matrix densification thiab kev kho tom qab. Cov carbon fiber muaj zog siab muaj lub zog siab thiab lub zog zoo, thiab lub cev prefabricated ua nrog nws muaj cov khoom siv kho tshuab zoo.
Mesophase txheej (uas yog, interface technology) yog qhov tseem ceeb hauv kev npaj cov txheej txheem, kev npaj cov txheej txheem mesophase txheej suav nrog cov tshuaj vapor osmosis (CVI), cov tshuaj vapor deposition (CVD), sol-sol method (Sol-gcl), polymer impregnation cracking method (PLP), qhov tsim nyog tshaj plaws rau kev npaj cov silicon carbide matrix composites yog CVI method thiab PIP method.
Cov ntaub ntawv txheej interfacial muaj xws li pyrolytic carbon, boron nitride thiab boron carbide, ntawm cov uas boron carbide ua ib hom txheej interfacial tiv taus oxidation tau them ntau dua thiab ntau dua. SiC-CMC, uas feem ntau siv rau hauv cov xwm txheej oxidation ntev, kuj yuav tsum tau dhau los ntawm kev kho mob tiv taus oxidation, uas yog, ib txheej ntawm cov silicon carbide ntom ntom nrog tuab li 100μm tau tso rau ntawm qhov chaw ntawm cov khoom los ntawm CVD txheej txheem los txhim kho nws qhov kub siab tiv taus oxidation.
Lub sijhawm tshaj tawm: Lub Ob Hlis-14-2023