Mawu Ogwiritsidwa Ntchito Kawirikawiri ndi Silicon Carbide Processing

Silicon Carbide yobwezeretsedwanso (RXSIC, ReSIC, RSIC, R-SIC). Zipangizo zoyambira ndi silicon carbide. Palibe zothandizira kukhuthala zomwe zimagwiritsidwa ntchito. Zipangizo zobiriwira zimatenthedwa kufika pa 2200ºC kuti ziphatikizidwe komaliza. Zipangizo zomwe zimatuluka zimakhala ndi 25% porosity, zomwe zimachepetsa mphamvu zake zamakaniko; komabe, zipangizozo zimatha kukhala zoyera kwambiri. Njirayi ndi yotsika mtengo kwambiri.
Reaction Bonded Silicon Carbide (RBSIC). Zipangizo zoyambira ndi silicon carbide kuphatikiza kaboni. Gawo lobiriwira limalowetsedwa ndi silicon yosungunuka pamwamba pa 1450ºC ndi reaction: SiC + C + Si -> SiC. Kapangidwe ka microstructure nthawi zambiri kamakhala ndi silicon yochulukirapo, yomwe imachepetsa mphamvu zake zotentha kwambiri komanso kukana dzimbiri. Kusintha pang'ono kwa mawonekedwe kumachitika panthawiyi; komabe, wosanjikiza wa silicon nthawi zambiri umakhala pamwamba pa gawo lomaliza. ZPC RBSiC zimagwiritsidwa ntchito ndi ukadaulo wapamwamba, womwe umapanga zingwe zotsutsana ndi kutayika, mbale, matailosi, zingwe zozungulira za cyclone, mabuloko, zigawo zosakhazikika, ndi nozzles za FGD zotsutsana ndi kutayika ndi dzimbiri, chosinthira kutentha, mapaipi, machubu, ndi zina zotero.

Nitride Bonded Silicon Carbide (NBSIC, NSIC). Zipangizo zoyambira ndi silicon carbide kuphatikiza ufa wa silicon. Chomera chobiriwira chimayatsidwa mumlengalenga wa nayitrogeni komwe kumachitika SiC + 3Si + 2N2 -> SiC + Si3N4. Zipangizo zomaliza sizisintha kwambiri pokonza. Zipangizozo zimakhala ndi mulingo wina wa porosity (nthawi zambiri pafupifupi 20%).

Direct Sintered Silicon Carbide (SSIC). Silicon carbide ndiye chinthu choyamba kupanga. Zothandizira kukhuthala ndi boron kuphatikiza kaboni, ndipo kukhuthala kumachitika ndi njira yochitira zinthu zolimba pamwamba pa 2200ºC. Mphamvu zake zotentha kwambiri komanso kukana dzimbiri ndizabwino chifukwa chosowa gawo lachiwiri looneka ngati galasi pamalire a tirigu.

Liquid Phase Sintered Silicon Carbide (LSSIC). Silicon carbide ndiye chinthu choyamba kupanga. Zothandizira kukhuthala ndi yttrium oxide kuphatikiza aluminiyamu oxide. Kukhuthala kumachitika pamwamba pa 2100ºC ndi madzi-gawo reaction ndipo kumabweretsa gawo lachiwiri looneka ngati galasi. Makhalidwe a makina nthawi zambiri amakhala abwino kuposa SSIC, koma makhalidwe ake otentha kwambiri komanso kukana dzimbiri sikwabwino.

Hot Pressed Silicon Carbide (HPSIC). Ufa wa silicon carbide umagwiritsidwa ntchito ngati zinthu zoyambira. Zinthu zothandizira kukhuthala nthawi zambiri zimakhala boron kuphatikiza kaboni kapena yttrium oxide kuphatikiza aluminiyamu oxide. Kukhuthala kumachitika pogwiritsa ntchito mphamvu ndi kutentha kwa makina mkati mwa graphite die cavity. Mawonekedwewo ndi mbale zosavuta. Zinthu zochepa zothandizira kutenthetsa zingagwiritsidwe ntchito. Zinthu zamagetsi zotenthetsa zimagwiritsidwa ntchito ngati maziko omwe njira zina zimayerekezeredwa. Zinthu zamagetsi zimatha kusinthidwa ndi kusintha kwa zinthu zothandizira kukhuthala.

CVD Silicon Carbide (CVDSIC). Zinthuzi zimapangidwa ndi njira yochotsera nthunzi ya mankhwala (CVD) yomwe imagwiritsa ntchito: CH3SiCl3 -> SiC + 3HCl. Kuyankhaku kumachitika pansi pa mlengalenga wa H2 pomwe SiC imayikidwa pa graphite substrate. Njirayi imapangitsa kuti pakhale chinthu choyera kwambiri; komabe, ma plate osavuta okha ndi omwe angapangidwe. Njirayi ndi yokwera mtengo kwambiri chifukwa cha nthawi yochepa yochitira zinthu.

Chemical Vapor Composite Silicon Carbide (CVCSiC). Njirayi imayamba ndi choyambira cha graphite chomwe chimapangidwa kukhala mawonekedwe a near-net mu graphite state. Njira yosinthira imapangitsa gawo la graphite kukhala ndi in situ vapor solid-state reaction kuti ipange polycrystalline, stoichiometrically correct SiC. Njirayi yolamulidwa bwino imalola mapangidwe ovuta kupangidwa mu gawo la SiC losinthidwa kwathunthu lomwe lili ndi mawonekedwe olekerera bwino komanso oyera kwambiri. Njira yosinthira imachepetsa nthawi yokhazikika yopangira ndikuchepetsa ndalama kuposa njira zina.* Gwero (kupatula pomwe lanenedwa): Ceradyne Inc., Costa Mesa, Calif.