Terminology Nthawi zambiri Yogwirizana ndi Silicon Carbide Processing

Recrystallized Silicon Carbide (RXSIC, ReSIC, RSIC, R-SIC). Zoyambira zopangira ndi silicon carbide. Palibe zothandizira densification zomwe zimagwiritsidwa ntchito. Zomera zobiriwira zimatenthedwa kupitirira 2200ºC kuti ziphatikizidwe komaliza. Zomwe zimapangidwira zimakhala ndi 25% porosity, zomwe zimalepheretsa makina ake; komabe, zinthuzo zikhoza kukhala zoyera kwambiri. Njirayi ndiyopanda ndalama zambiri.
Reaction Bonded Silicon Carbide (RBSIC). Zopangira zoyambira ndi silicon carbide kuphatikiza kaboni. Chigawo chobiriwiracho chimalowetsedwa ndi silicon yosungunuka pamwamba pa 1450ºC ndi zomwe zimachitika: SiC + C + Si -> SiC. Microstructure nthawi zambiri imakhala ndi silicon yochulukirapo, yomwe imachepetsa kutentha kwake komanso kukana dzimbiri. Kusintha kwapang'ono pang'ono kumachitika panthawiyi; komabe, wosanjikiza wa silicon nthawi zambiri amakhala pamwamba pa gawo lomaliza. ZPC RBSiC amatengera luso patsogolo, kubala avale kukana akalowa, mbale, matailosi, akalowa chimphepo, midadada, mbali zosakhazikika, ndi kuvala & dzimbiri kukana FGD nozzles, exchanger kutentha, mipope, machubu, ndi zina zotero.

Nitride Bonded Silicon Carbide (NBSIC, NSIC). Zida zoyambira ndi silicon carbide kuphatikiza ufa wa silicon. Chomera chobiriwira chimawotchedwa mumlengalenga wa nitrogen komwe SiC + 3Si + 2N2 -> SiC + Si3N4 imachitika. Zinthu zomaliza zikuwonetsa kusintha pang'ono panthawi yokonza. Nkhaniyi ikuwonetsa mulingo wina wa porosity (nthawi zambiri pafupifupi 20%).

Direct Sintered Silicon Carbide (SSIC). Silicon carbide ndiye zoyambira zopangira. Thandizo la kachulukidwe ndi boron kuphatikiza kaboni, ndipo kachulukidwe kumachitika ndi njira yolimba yopitilira 2200ºC. Kutentha kwake kwapamwamba komanso kukana kwa dzimbiri ndizopambana chifukwa cha kusowa kwa gawo lachiwiri lagalasi pamalire a tirigu.

Liquid Phase Sintered Silicon Carbide (LSSIC). Silicon carbide ndiye zoyambira zopangira. Zothandizira kachulukidwe ndi yttrium oxide kuphatikiza aluminium oxide. Kuchulukana kumachitika pamwamba pa 2100ºC ndi kachitidwe kamadzimadzi ndipo kumabweretsa gawo lachiwiri lagalasi. Makina amakina nthawi zambiri amakhala apamwamba kuposa SSIC, koma kutentha kwambiri komanso kukana kwa dzimbiri sikwabwino.

Hot Pressed Silicon Carbide (HPSIC). Silicon carbide ufa imagwiritsidwa ntchito ngati zoyambira zopangira. Zothandizira kachulukidwe nthawi zambiri zimakhala boron kuphatikiza carbon kapena yttrium oxide kuphatikiza aluminiyamu okusayidi. Kachulukidwe kumachitika ndi ntchito imodzi ya makina kuthamanga ndi kutentha mkati graphite kufa patsekeke. Maonekedwe ndi mbale zosavuta. Zothandizira zochepa za sintering zitha kugwiritsidwa ntchito. Makina opangira zida zopanikizidwa ndi moto amagwiritsidwa ntchito ngati maziko omwe njira zina zimafananizidwa. Mphamvu zamagetsi zimatha kusinthidwa ndi kusintha kwa zida za densification.

CVD Silicon Carbide (CVDSIC). Izi zimapangidwa ndi ndondomeko ya vapor deposition (CVD) yokhudzana ndi zomwe zimachitika: CH3SiCl3 -> SiC + 3HCl. Zomwe zimachitikazi zimachitika pansi pa mlengalenga wa H2 pomwe SiC imayikidwa pagawo la graphite. Zotsatira zake zimakhala zoyera kwambiri; komabe, mbale zosavuta zokha zingapangidwe. Njirayi ndi yokwera mtengo kwambiri chifukwa cha nthawi yapang'onopang'ono.

Chemical Vapor Composite Silicon Carbide (CVCSiC). Izi zimayamba ndi kalambulabwalo wa graphite yemwe amapangidwa mozungulira pafupifupi mawonekedwe a graphite. Kutembenuka kumapangitsa gawo la graphite kukhala in situ vapor solid-state reaction kuti ipange polycrystalline, stoichiometrically yolondola SiC. Njira yoyendetsedwa bwinoyi imalola kuti mapangidwe ovuta apangidwe mu gawo la SiC lomwe lili ndi mawonekedwe olimba komanso kuyera kwambiri. Kusinthaku kumafupikitsa nthawi yopangira zinthu komanso kumachepetsa ndalama poyerekezera ndi njira zina.* Gwero (kupatulapo pomwe tanena): Ceradyne Inc., Costa Mesa, Calif.