Umehluko phakathi kwe-silicon carbide graphite crucible ne-graphite crucible

Kunomehluko omkhulu phakathii-silicon carbide cruciblesnama-graphite crucibles ezicini eziningi ezifana nezinto, izinqubo, ukusebenza, namanani. Lo mehluko awuthinti kuphela inqubo yayo yokukhiqiza, kodwa futhi unquma ukusebenza kwayo kanye nezimo zohlelo lokusebenza.

umehluko omkhulu
I-graphite crucibles yenziwe ngokuyinhloko nge-graphite ye-flake yemvelo futhi isebenzisa ubumba njenge-binder. Le nhlanganisela inika i-graphite crucible conductivity enhle kakhulu yokushisa kanye nokumelana nokushisa okuphezulu, okuyenza ifanelekele ukusetshenziswa ezinqubweni zokuncibilika kwezinga lokushisa eliphezulu. Isakhiwo esiyingqayizivele kanye ne-thermal conductivity ephezulu ye-flake yemvelo ye-graphite yenza ama-graphite crucibles adume kakhulu ezimbonini ze-metallurgical kanye ne-Foundry.

I-silicon carbide crucible isekelwe ku-graphite ye-flake yemvelo, ne-silicon carbide njengengxenye eyinhloko kanye ne-high-temperature resin njenge-binder. Njengento eqinile kakhulu, i-silicon carbide inokumelana nokugqokwa okuphezulu kakhulu kanye nokuzinza kokushisa, okuvumela i-silicon carbide crucibles ukuthi isetshenziswe ezindaweni ezinokhahlo. Ukusetshenziswa kwe-high-temperature resin nakho kuthuthukisa amandla ewonke we-crucible nokuqina.

Umehluko wenqubo
Inqubo yokukhiqiza i-graphite crucible incike kakhulu ekucindezeleni okwenziwa ngesandla nokomshini. Ama-graphite crucibles amancane ngokuvamile akhiwa ngokucindezela ngomshini, bese efakwa kuhhavini ekushiseni okuphezulu kwama-degree angu-1,000, futhi ekugcineni ambozwe nge-anti-corrosion glaze noma ngopende ovikela umswakama ukuze kwandiswe ukuqina nokumelana nokugqwala. Le nqubo yendabuko, nakuba ingabizi kakhulu, inemikhawulo mayelana nokusebenza kahle kokukhiqiza kanye nokuvumelana kwekhwalithi.

Inqubo yokukhiqiza ye-silicon carbide crucible isithuthuke kakhulu, kusetshenziswa imishini yokucindezela ye-isostatic kanye nefomula yesayensi. Ubuchwepheshe bokucindezela be-Isostatic busebenzisa ukucindezela okufanayo (kufika ku-150 MPa), okuholela ekumineni okuphezulu nokuvumelana ku-crucible. Le nqubo ayigcini nje ngokuthuthukisa amandla emishini ye-crucible, kodwa futhi ithuthukisa kakhulu ukumelana kwayo nokushaqeka okushisayo nokugqwala.

Umehluko wokusebenza
Mayelana nokusebenza, kunomehluko omkhulu phakathi kwe-graphite crucibles ne-silicon carbide crucibles. I-graphite crucibles inokuminyana okungu-13 kA/cm², kuyilapho izikhilimu ze-silicon carbide zinesisindo esingu-1.7 ukuya ku-26 kA/mm². Ukuphila kwesevisi ye-graphite crucibles kuvame izikhathi ezingu-3-5 kune-silicon carbide crucibles, okubangelwa ikakhulukazi amandla ezinto ezibonakalayo aphezulu kanye nokumelana nokugqwala kwe-silicon carbide crucibles.

Ngaphezu kwalokho, umehluko wokushisa phakathi kwangaphakathi nangaphandle kwe-graphite crucible cishe ama-degrees angu-35, kanti umehluko wokushisa we-silicon carbide crucible ungama-degree angu-2-5 kuphela, okwenza i-silicon carbide crucible ibe phezulu kakhulu ngokulawulwa kokushisa nokushisa. ukuzinza. Ukumelana ne-asidi ne-alkali kanye nokumelana nokugqwala kwe-silicon carbide crucibles nakho kuphakeme kakhulu kunaleyo ye-graphite crucibles, ethuthukisa kakhulu ukusebenza kahle kwamandla futhi yonga amandla angaba ngu-50% kune-graphite crucibles.

umehluko ngentengo
Ngenxa yokuhluka kwezinto zokwakha kanye nezinqubo zokukhiqiza, ama-graphite crucibles nama-silicon carbide crucibles nawo anomehluko omkhulu wamanani. Ngokuvamile, izinsimbi ze-silicon carbide crucibles zibiza ngokuphindwe kathathu kune-graphite crucibles. Lo mehluko wamanani ubonisa izinzuzo ezibalulekile ze-silicon carbide crucibles mayelana nezindleko zempahla, inkimbinkimbi yenqubo yokukhiqiza nokusebenza.

Kafushane, nakuba iziphambano ze-silicon carbide zibiza kakhulu, ukuqina kwazo okuphakeme, ukumelana nokugqwala, nokusebenza kahle kwamandla kuzenza zibe ukukhetha okubiza izindleko eziningi ezisetshenziswayo. I-graphite crucibles isasetshenziswa kabanzi ezinhlelweni eziningi zendabuko ngenxa yezindleko eziphansi kanye nezakhiwo ezinhle eziyisisekelo. Izinzuzo nezinkinga ezilandelanayo zalezi ziphambano ezimbili zinquma ukuthi zifanele izimo zohlelo lokusebenza ezihlukene.