M'zaka za m'ma 21, ndi chitukuko cha sayansi ndi luso, zambiri, mphamvu, zipangizo, zamoyo zomangamanga wakhala mizati zinayi za chitukuko cha zokolola masiku ano, silicon carbide chifukwa khola mankhwala katundu, mkulu matenthedwe madutsidwe, matenthedwe kukulitsa koyefishienti wa yaying'ono, kachulukidwe kakang'ono, kukana kwabwino, kuuma kwakukulu, mphamvu zamakina apamwamba, kukana kwa dzimbiri kwa mankhwala ndi zinthu zina, kukula mwachangu m'munda wa zida, Zogwiritsidwa ntchito kwambiri mu ceramic. mayendedwe a mpira, ma valve, zida za semiconductor, gyro, chida choyezera, mlengalenga ndi zina.
Silicon carbide ceramics adapangidwa kuyambira 1960s. M'mbuyomu, silicon carbide inkagwiritsidwa ntchito kwambiri pogaya makina ndi ma refractories. Mayiko padziko lonse lapansi amagwirizana kwambiri ndi kukula kwa ziwiya zadothi zotsogola, ndipo tsopano sikungokhutitsidwa ndi kukonzekera ziwiya zadothi za silicon carbide, kupanga mabizinesi apamwamba kwambiri a ceramics akukula mwachangu, makamaka m'maiko otukuka. M'zaka zaposachedwa, zoumba zamitundu yambiri zozikidwa pa SIC ceramics zawoneka motsatizana, kupititsa patsogolo kulimba ndi kulimba kwa zida za monomer. Silicon carbide minda yayikulu yogwiritsira ntchito, ndiye kuti, zoumba zogwira ntchito, zida zapamwamba zokanira, ma abrasives ndi zitsulo zopangira zitsulo.
Silicon carbide ceramics ali ndi kukana kwabwino kovala
Silicon carbide ceramics mankhwalawa adawerengedwa ndikutsimikiziridwa. Kukana kwazitsulo za silicon carbide ceramics mankhwalawa ndi ofanana ndi 266 times of manganese zitsulo, zofanana ndi 1741 nthawi za high chromium cast iron. Kukaniza kuvala ndikwabwino kwambiri. Ikhoza kutipulumutsabe ndalama zambiri. Silicon carbide ceramics itha kugwiritsidwa ntchito mosalekeza kwa zaka zopitilira khumi.
Silicon carbide ceramics ali ndi mphamvu zambiri, kuuma kwakukulu komanso kulemera kopepuka
Monga mtundu watsopano wa zinthu, kugwiritsa ntchito silicon carbide ceramics mphamvu ya mankhwalawa ndi yokwera kwambiri, kuuma kwakukulu, kulemera kumakhalanso kopepuka, zoumba za silicon carbide zomwe zikugwiritsidwa ntchito, unsembe ndi m'malo mwa pamwambazi zidzakhala zosavuta.
Khoma lamkati la silicon carbide ceramic ndi losalala ndipo silimatsekereza ufa
Silicon carbide ceramics mankhwalawa amawotchedwa pambuyo pa kutentha kwakukulu, kotero mapangidwe a silicon carbide ceramics ndi wandiweyani, pamwamba pake ndi osalala, kukongola kwa kugwiritsidwa ntchito kudzakhala kwabwino kwambiri, komwe kumagwiritsidwa ntchito m'banja, kukongola kudzakhala kwabwino kwambiri.
Mtengo wa silicon carbide ceramics ndi wotsika
Mtengo wa kupanga silicon carbide ceramics palokha ndi wocheperako, kotero sitiyenera kugula mtengo wa silicon carbide ceramics ndalama zambiri, kotero kwa banja lathu, komanso kupulumutsa ndalama zambiri.
Silicon carbide ceramic ntchito:
Silicon carbide ceramic mpira
Mpira wa Silicon carbide ceramic uli ndi zida zabwino kwambiri zamakina, kukana kwa okosijeni kwabwino kwambiri, kukana kwa abrasion komanso kutsika kwamphamvu kwamphamvu. Silicon carbide ceramic mpira kutentha kwambiri mphamvu, wamba ceramic zinthu pa 1200 ~ 1400 madigiri Celsius mphamvu adzakhala kwambiri yafupika, ndi silicon carbide pa 1400 digiri Celsius mphamvu kupinda akadali anakhalabe pa mlingo wapamwamba wa 500 ~ 600MPa, kotero kutentha ntchito yake akhoza kufika. 1600 ~ 1700 digiri Celsius.
Silicon carbide composite zakuthupi
Silicon carbide matrix composites (SiC-CMC) yakhala ikugwiritsidwa ntchito kwambiri pazamlengalenga chifukwa cha kutentha kwambiri chifukwa cha kulimba kwawo, mphamvu yayikulu komanso kukana kwa okosijeni kwabwino kwambiri. Njira yokonzekera ya SiC-CMC imaphatikizapo kuwongolera kwa fiber, chithandizo cha kutentha kwambiri, zokutira za mesophase, kachulukidwe ka matrix ndi chithandizo chapambuyo. Mphamvu yapamwamba ya carbon fiber imakhala ndi mphamvu zambiri komanso kulimba kwabwino, ndipo thupi lopangidwa kale lomwe limapangidwa nalo limakhala ndi makina abwino.
Kupaka kwa Mesophase (ndiko kuti, ukadaulo waukadaulo) ndiye ukadaulo wofunikira pokonzekera, kukonzekera njira zopaka za mesophase kumaphatikizapo vapor osmosis (CVI), vapor deposition (CVD), sol-sol njira (Sol-gcl), polima. impregnation cracking njira (PLP), yoyenera kwambiri pokonza silicon carbide masanjidwewo composites ndi CVI njira ndi PIP njira.
Zida zokutira zophatikizika zimaphatikizira pyrolytic carbon, boron nitride ndi boron carbide, pomwe boron carbide ngati mtundu wa zokutira zolimbana ndi ma oxidation interface yaperekedwa chidwi kwambiri. SiC-CMC, yomwe nthawi zambiri imagwiritsidwa ntchito muzinthu zamakutidwe ndi okosijeni kwa nthawi yayitali, imayeneranso kuthandizidwa ndi makutidwe ndi okosijeni, ndiye kuti, wosanjikiza wa silicon carbide wokhala ndi makulidwe a 100μm wayikidwa pamwamba pa mankhwala ndi CVD. kuti apititse patsogolo kutentha kwake kwa okosijeni.
Nthawi yotumiza: Feb-14-2023