I-porcelain ye-silicon carbide e-Reaction-sintered inamandla amahle okucindezela ekushiseni okumaphakathi, ukumelana nokushisa ekushiseni komoya, ukumelana nokuguguleka okuhle, ukumelana nokushisa okuhle, i-coefficient encane yokwanda okuqondile, i-coefficient ephezulu yokudlulisa ukushisa, ubulukhuni obuphezulu, ukumelana nokushisa nokubhubhisa, ukuvimbela umlilo kanye nezinye izici zekhwalithi ephezulu. Isetshenziswa kabanzi ezimotweni, ukuzenzekela kwemishini, ukuvikelwa kwemvelo kwemvelo, ubunjiniyela bezindiza, okuqukethwe kolwazi kumadivayisi kagesi, amandla kagesi kanye nezinye izinkambu, isibe yi-ceramics yesakhiwo engabizi futhi engenakuphindwa emikhakheni eminingi yezimboni.
Ukushisisa ngaphandle kokucindezela kwaziwa njengendlela ethembisayo yokubala i-SiC. Emishinini ehlukene yokuphonsa eqhubekayo, ukushisisa okungenakucindezela kungahlukaniswa kube ukubala kwesigaba esiqinile kanye nokubala kwesigaba soketshezi okusebenzayo okuphezulu. Ngokufaka i-B kanye ne-C efanele (okuqukethwe komoya-mpilo okungaphansi kuka-2%) ndawonye ku-Beta SiC powder enhle kakhulu, i-S. Proehazka ishisisa emzimbeni we-SIC calcined onobukhulu obungaphezu kuka-98% ngo-2020, kanye ne-Al2O3 kanye ne-Y2O3 njengezithasiselo. I-Calcined engu-0.5m-SiC ngaphansi kuka-1850-1950 (ubuso bezinhlayiya obune-SiO2 encane), isiphetho siwukuthi ubukhulu be-SiC porcelain budlula u-95% wobuningi obuyisisekelo bethiyori, usayizi wokusanhlamvu mncane, kanti usayizi ojwayelekile mkhulu, ongu-1.5μm.
I-reactive sintering silicon carbide ibhekisela kuyo yonke inqubo yokubonakalisa isakhiwo se-billet esinezimbobo ngesigaba soketshezi noma isigaba soketshezi esisebenza kahle kakhulu, ukuthuthukisa ikhwalithi ye-billet, ukunciphisa umgodi womoya, kanye nokufaka i-calcining umkhiqizo oqediwe ngamandla athile kanye nokunemba okulinganayo. I-Plutonium-sic powder kanye ne-graphite emsulwa kakhulu kuxutshwa ngesilinganiso esithile futhi kushiswe cishe ku-1650 ukuze kukhiqizwe umbungu wezinwele. Ngesikhathi esifanayo, ingena noma ingena ensimbini ngesigaba soketshezi i-Si, ibonakalisa ne-silicon carbide ukuze yakhe i-plutonium-sic, futhi ihlangana nezinhlayiya ze-plutonium-sic ezikhona. Ngemva kokungena kwe-Si, umzimba osinkiwe wokusabela one-density eningiliziwe kanye nosayizi ongakafakwa ungatholakala. Uma kuqhathaniswa nezinye izindlela zokusika, enkambisweni yokusabela okuphezulu kobukhulu bokusika ukuguqulwa kuncane kakhulu, kungadala usayizi ofanele wezimpahla, kodwa kune-SiC eningi emzimbeni osinkiwe, izici zokushisa eziphakeme ze-reaction sinkiwe i-SiC porcelain zizoba zimbi kakhulu. Izitsha ze-SiC ezifakwe i-calcium ezingenayo ingcindezi, izitsha ze-SiC ezifakwe i-calcium ezishisayo kanye nezitsha ze-SiC ezifakwe i-reaction sintered zinezici ezahlukene.
Abakhiqizi be-silicon carbide e-Reactive sintering: Isibonelo, i-SiC porcelain ezingeni lobuningi obuhlobene ne-calcined kanye namandla okugoba, i-hot pressing sintering kanye ne-hot isostatic pressing calcination ziningi, kanti i-reactive sintering SiC iphansi kakhulu. Ngesikhathi esifanayo, izakhiwo zomzimba ze-SiC porcelain ziyashintsha ngokushintsha kwe-calcination modifier. I-non-pressure sintering, i-hot pressing sintering kanye ne-reaction sintering ye-SiC porcelain inokumelana okuhle kwe-alkaline kanye nokumelana ne-asidi, kodwa i-reaction sintered SiC porcelain inokumelana okubuthakathaka ne-HF kanye nokunye ukugqwala kwe-asidi okunamandla kakhulu. Lapho izinga lokushisa elizungezile lingaphansi kuka-900, amandla okugoba eningi ye-SiC porcelain aphezulu kakhulu kunalawo e-high temperature sintered porcelain, futhi amandla okugoba e-reactive sintered SiC porcelain ehla kakhulu uma idlula u-1400. (Lokhu kubangelwa ukwehla okungazelelwe kwamandla okugoba kwenani elithile lengilazi e-laminated Si ngaphezu kokushisa okuthile emzimbeni we-calcined. Ukusebenza kokushisa okuphezulu kwe-SiC ceramics sintered ngaphandle kwe-pressure calcination kanye ne-hot constant static pressure kuthinteka kakhulu yizinhlobo zezithasiselo.
Isikhathi sokuthunyelwe: Novemba-07-2023