Izinzuzo zezitini ze-magnesia carbon yilezi:ukumelana nokuguguleka kwe-slag kanye nokumelana okuhle nokushaqeka kokushisa. Esikhathini esidlule, ukungathandeki kwezitini ze-MgO-Cr2O3 kanye nezitini ze-dolomite kwakuwukuthi zazimunca izingxenye ze-slag, okwaholela ekuqhekekeni kwesakhiwo, okwaholela ekulimaleni kwangaphambi kwesikhathi. Ngokufaka i-graphite, izitini ze-magnesia carbon zaqeda lokhu kusilela. Isici sazo ukuthi i-slag ingena kuphela endaweni yokusebenza, ngakho-ke ungqimba lokusabela Luvalelwe endaweni yokusebenza, isakhiwo sinokuqhekeka okuncane kanye nokuphila isikhathi eside kwenkonzo.
Manje, ngaphezu kwezitini ze-magnesia carbon zendabuko eziboshwe nge-asphalt kanye ne-resin (kufaka phakathi izitini ze-magnesia ezifakwe uwoyela),izitini ze-magnesia carbon ezithengiswa emakethe zifaka phakathi:
(1) Izitini ze-Magnesia carbon ezenziwe nge-magnesia equkethe i-96%~97% MgO kanye ne-graphite 94%~95%C;
(2) Izitini ze-Magnesia carbon ezenziwe nge-magnesia equkethe u-97.5% ~ 98.5% MgO kanye ne-graphite 96% ~ 97% C;
(3) Izitini ze-Magnesia carbon ezenziwe nge-magnesia equkethe i-98.5% ~ 99% MgO kanye ne-98% ~ C graphite.
Ngokusho kokuqukethwe kwekhabhoni, izitini zekhabhoni ze-magnesia zihlukaniswe kanje:
(I) Izitini ze-magnesia ezifakwe uwoyela ovuthayo (okuqukethwe kwekhabhoni kungaphansi kuka-2%);
(2) Izitini ze-magnesia eziboshwe ngekhabhoni (okuqukethwe kwekhabhoni kungaphansi kuka-7%);
(3) Isitini se-carbon se-magnesia esiboshwe nge-resin (okuqukethwe kwe-carbon kungu-8% ~ 20%, kufika ku-25% ezimweni ezimbalwa). Ama-antioxidants avame ukungezwa ezitini ze-carbon ze-magnesia eziboshwe nge-asphalt/resin (okuqukethwe kwe-carbon kungu-8% kuya ku-20%).
Izitini ze-Magnesia carbon zikhiqizwa ngokuhlanganisa isihlabathi se-MgO esihlanzekile kakhulu ne-scaly graphite, i-carbon black, njll. Inqubo yokukhiqiza ifaka phakathi izinqubo ezilandelayo: ukuchoboza izinto zokusetshenziswa, ukuhluza, ukuhlela, ukuxuba ngokuya ngomklamo wefomula yezinto kanye nokusebenza kokusetha umkhiqizo, ngokuya ngenhlanganisela. Izinga lokushisa lohlobo lwe-ejenti liphakanyiswa lifinyelele ku-100 ~ 200℃, futhi lixovwa kanye ne-binder ukuze kutholakale udaka olubizwa ngokuthi i-MgO-C (ingxube yomzimba oluhlaza). Izinto zodaka ze-MgO-C ezisebenzisa i-resin yokwenziwa (ikakhulukazi i-phenolic resin) zibunjwa esimweni sokubanda; izinto zodaka ze-MgO-C ezihlanganiswe ne-asphalt (ezifudunyezwayo esimweni sokuba uketshezi) zibunjwa esimweni esishisayo (cishe ku-100°C) ukwakha. Ngokusho kosayizi we-batch kanye nezidingo zokusebenza kwemikhiqizo ye-MgO-C, imishini yokudlidliza ye-vacuum, imishini yokubumba yokucindezela, ama-extruder, imishini yokunyathelisa ye-isostatic, imishini yokunyathelisa eshisayo, imishini yokufudumeza, kanye nemishini yokumisa ingasetshenziswa ukucubungula izinto zodaka ze-MgO-C. zibe nesimo esifanele. Umzimba we-MgO-C owakhiwe ufakwa kuhhavini ku-700 ~ 1200°C ukuze kulungiswe ukushisa ukuguqula i-binding agent ibe yi-carbon (le nqubo ibizwa ngokuthi i-carbonization). Ukuze kwandiswe ubuningi bezitini ze-magnesia carbon futhi kuqiniswe i-bonding, ama-filler afana nama-binder angasetshenziswa futhi ukufaka izitini emanzini.
Namuhla, i-resin yokwenziwa (ikakhulukazi i-resin ye-phenolic) isetshenziswa kakhulu njenge-ejenti yokubopha izitini ze-magnesia carbon.Ukusetshenziswa kwezitini ze-carbon ze-magnesia eziboshwe nge-resin zokwenziwa kunezinzuzo ezilandelayo eziyisisekelo:
(1) Izici zemvelo zivumela ukucutshungulwa nokukhiqizwa kwale mikhiqizo;
(2) Inqubo yokukhiqiza imikhiqizo ngaphansi kwezimo zokuxuba ezibandayo igcina amandla;
(3) Umkhiqizo ungacutshungulwa ngaphansi kwezimo zokungapholi;
(4) Uma kuqhathaniswa ne-tar asphalt binder, ayikho ingxenye yepulasitiki;
(5) Okuqukethwe kwekhabhoni okwandisiwe (i-graphite noma amalahle amaningi e-bituminous) kungathuthukisa ukumelana nokuguguleka kanye nokumelana ne-slag.
Isikhathi sokuthunyelwe: Feb-23-2024
