Inkqubo yokuvelisa izitena ze-magnesia carbon refractory

impahla engekasilwa

Ezona zixhobo ziphambili zeMgO-C zezitena ziquka i-magnesia edibeneyo okanye i-sintered magnesia, i-flake graphite, i-organic binders kunye ne-antioxidants.

EMagnesia

I-Magnesia yeyona nto iphambili yokuvelisa izitena ze-MgO-C, ezinokuthi zihlulwe zibe yi-magnesia edibeneyo kunye ne-sintered magnesia. Xa kuthelekiswa ne-sintered magnesia, i-magnesia edityanisiweyo ineengenelo ze-coarse periclase crystal grains kunye ne-particle enkulu ye-volume density. Yeyona nto iphambili esetyenziswa ekuveliseni izitena zekhabhoni ze-magnesia. Imveliso ye-refractories ye-magnesia eqhelekileyo idinga amandla aphezulu okushisa kunye nokumelana nokubola kwezinto eziluhlaza ze-magnesia. Ngoko ke, ingqalelo ihlawulwe ekucocekeni kwe-magnesia kunye ne-C / S ratio kunye nomxholo we-B2O3 kwi-chemical composition. Ngophuhliso lweshishini le-metallurgical, iimeko zokunyibilikisa ziba nzima ngakumbi. Ukongeza kwimichiza yeekhemikhali, i-magnesia esetyenziswe kwizitena ze-MgO-C ezisetyenziselwa izixhobo ze-metallurgical (i-converter, isithando sombane, i-ladle, njl.) Idinga ubuninzi obuphezulu kunye ne-Great crystallization.

Umthombo wekhabhoni

Ingaba kwizitena zeMgO-C zemveli okanye izitena eziphantsi kwekhabhoni ye-MgO-C ezisetyenziswa ngobuninzi, i-flake graphite isetyenziswa kakhulu njengomthombo wayo wekhabhoni. Igraphite, njengeyona mathiriyeli ikrwada yokuveliswa kwezitena zeMgO-C, ixhamla ikakhulu kwiimpawu zayo ezibalaseleyo: ① ukungamanzisi kwi-slag. ②Ukuhanjiswa kwe-thermal ephezulu. ③Ukwandiswa kwe-thermal ephantsi. Ukongezelela, izinto zegraphite kunye ne-refractory musa i-eutectic kumaqondo aphezulu, kwaye zine-refractoriness ephezulu. Ukucoceka kwegraphite kunempembelelo enkulu ekusebenzeni kwezitena zeMgO-C. Ngokuqhelekileyo, igraphite enomxholo wekhabhoni engaphezu kwe-95%, kwaye ilungile kakhulu, ngaphezu kwe-98% kufuneka isetyenziswe.

Ukongeza kwigraphite, i-carbon black iphinda isetyenziswe ngokuqhelekileyo ekuveliseni izitena zekhabhoni ze-magnesia. Ikhabhoni emnyama yinto esasazwe kakhulu emnyama engumgubo wekhabhoni eveliswa kukubola kobushushu okanye ukutsha okungaphelelanga kweehydrocarbon hydrocarbons. Ikhabhoni emnyama inamasuntswana amahle (ngaphantsi kwe-1μm), indawo enkulu yendawo ethile, kunye neqhekeza elikhulu lekhabhoni lingama-90 ~ 99%, ubunyulu obuphezulu, ukuchaneka okuphezulu komgubo, ukuzinza okuphezulu kwe-thermal, ukuhanjiswa kwe-thermal ephantsi, kunzima ukwenza igraphitize carbon. . Ukongezwa kwekhabhoni emnyama kunokuphucula ukuchasana kwe-spalling yezitena ze-MgO-C, ukwandisa inani lekhabhoni eseleyo, kunye nokwandisa ubuninzi bezitena.

I-arhente ebophelelayo

Izibophelelo eziqhelekileyo ezisetyenziselwa ukuveliswa kwezitena ze-MgO-C ziquka i-tar yamalahle, i-tar yamalahle kunye ne-petroleum pitch, kunye ne-carbon resins ekhethekileyo, i-polyols, i-pitch-modified phenolic resins, i-synthetic resins, njl njl.

1) Izinto ze-asphalt. I-Tar pitch luhlobo lwemathiriyeli ye-thermoplastic. Ineempawu zobudlelwane obuphezulu kunye negraphite kunye ne-magnesium oxide, ireyithi ephezulu ye-carbon eseleyo emva kwe-carbonization, kunye neendleko eziphantsi. Isetyenziswe kakhulu kwixesha elidlulileyo; kodwa i-tar pitch iqulethe i-carcinogenic aromatics hydrocarbons, ngakumbi umxholo we-benzophthalone. Phezulu; ngenxa yokomelezwa kolwazi ngokusingqongileyo, ukusetyenziswa kwetela ngoku kuyehla.

2) Izinto ze-resin. I-synthetic resin yenziwa ngokusabela kwe-phenol kunye ne-formaldehyde. Inokudibanisa kakuhle kunye neengqungquthela eziphikisayo kwiqondo lokushisa. Emva kwe-carbonization, izinga le-carbon eseleyo liphezulu. Okwangoku iyona nto idibanisa ukuveliswa kwezitena zeMgO-C; kodwa yenziwa emva kwecarbonization. Isakhiwo senethiwekhi yeglasi ayifanelekanga ukuxhathisa ukothuka kwe-thermal kunye nokumelana ne-oxidation yezinto eziphikisayo.

3) Ngesiseko se-asphalt kunye ne-resin, into efunyenwe emva kokuguqulwa. Ukuba i-agent edibeneyo inokuthi ifakwe i-carbonized ukuze yenze i-inlaid structure kunye ne-carbon fiber material in situ, ke le arhente yokubambisana iya kuphucula ukusebenza kokushisa okuphezulu kwezinto eziphikisayo.

Antioxidants

Ukuze kuphuculwe ukuxhatshazwa kwe-oxidation yezitena ze-MgO-C, inani elincinci lezongezo lihlala lidityanisiwe. Izongezo eziqhelekileyo zezi Si, Al, Mg, Al-Si, Al-Mg, Al-Mg-Ca, Si-Mg-Ca, SiC, B4C, BN kwaye kutshanje kuxelwe iAl-BC kunye ne-Al-SiC-C izongezo [5 -7]. Umgaqo wesenzo sezongezo unokwahlulwa ngokurhabaxa ube yimiba emibini: Kwelinye icala, ngokwembono ye-thermodynamics, oko kukuthi, kwiqondo lobushushu lokusebenza, izongezo okanye izongezo zisabela ngekhabhoni ukuze zenze ezinye izinto, kwaye ukunxulumana kwazo neoksijini kukhulu. ngaphezu kwekhabhoni neoksijini. , Kuthatha indawo yokuqala ngaphezu kwekhabhoni ukuba ifakwe i-oxidized ukukhusela i-carbon; Ngakolunye uhlangothi, ukusuka kumbono we-kinetics, i-Chemical Density, i-block pores, ithintela ukusasazwa kwe-oksijini kunye neemveliso zokuphendula, njl.