Yiziphi izithako izitini mullite?

Izithako zinganqunywa ngokusho kokuqukethwe kwe-Al2O3 kunqunywa izimo zokusetshenziswa. Njengamanje, izindlela ezijwayelekile zesithako yilezi:

①I-mullite yokwenziwa (i-sintered noma ihlanganisiwe) iyimpushana ehlanganisiwe + yokwenziwa ye-mullite;

②I-mullite yokwenziwa (i-sintered noma ihlanganisiwe) iyi-aggregate + i-mullite yokwenziwa impushana + i-Al2O3 impushana ecolekile + impushana yobumba ehlanzekile;

③I-mullite yokwenziwa (i-sintered noma ehlanganisiwe) ne-corundum ehlanganisiwe emhlophe iyingxube + yokwenziwa ye-mullite powder emihle + i-Al2O3 powder ecolekileyo + impushana yobumba emsulwa. Isilinganiso sosayizi wezinhlayiyana kufanele silungiselelwe ngokuvumelana nesimiso sesithako esithi “enkulu emikhawulweni yomibili futhi encane phakathi”. Sebenzisa i-sulfite pulp waste liquid noma i-polyaluminium chloride noma i-polyphosphate njenge-agent ebophayo. Ngemva kokuxutshwa ngokulinganayo, kwakhiwa ngaphansi kwengcindezi ephezulu futhi kushiswe kuhhavini lokushisa eliphezulu. Izinga lokushisa lokudubula linqunywa okuqukethwe kwe-Al2O3 esitini esiphikisayo. Phakathi kuka-1600 ~ 1700℃.

Izitini ze-Zirconium mullite ziyimikhiqizo ephikisayo ehlanganisiwe eyenziwe nge-mullite ne-zirconia. I-Zirconium mullite ehlanganisiwe ye-cast cast inesakhiwo sekristalu esiminyene, izinga lokushisa eliphakeme lokuthambisa ngaphansi komthwalo, ukuzinza okuhle kokushisa, amandla aphezulu emishini ekamelweni lokushisa kanye nokushisa okuphezulu, ukumelana okuhle kokugqoka, ukuqhutshwa okuhle kwe-thermal, nokumelana okuhle kakhulu nokuguguleka.

I-Fe2O3 inokunyibilika okuthile okuqinile ku-mullite ne-corundum ezingeni lokushisa eliphezulu, okwenza isixazululo esiqinile esinomkhawulo. I-solubility yayo eqinile ku-corundum iphakeme kunaleyo ye-mullite, futhi i-crystal lattice ye-mullite ne-corundum ikhula ngenxa yokwakhiwa kwesisombululo esiqinile. Izinga lokushisa lokuqala lokuncibilika le-Fe2O3 lezinto ze-Al2O3-SiO2 lihlobene nokuqukethwe kwe-Al2O3 ohlelweni noma isilinganiso se-Al2O3/SiO2. Uma i-Al2O3/SiO2<2.55, izinga lokushisa lokuqala lokuncibilika lingu-1380℃. Uma i-Al2O3/SiO2>2.55, izinga lokushisa lokuqala lokuncibilika lingu-1380℃. Izinga lokushisa elincibilikayo lenyuka laya ku-1460℃, futhi kancane kancane liyakhula ngokukhula kokuqukethwe kwayo kwe-Al2O3. Emkhathini wokunciphisa, i-Fe2O3 yehliselwa ku-FeO futhi ihlakazeka esigabeni sengilazi, futhi izinga lokushisa elincibilikayo lesistimu lehla liye ku-1240 ° C no-1380 ° C, ngokulandelana.

Ngokukhula kokuqukethwe kwe-Al2O3 ezitini ze-mullite, ukusebenza kwayo kokushisa okuphezulu kuyathuthuka; kuyilapho inani le-solvent likhuphuka, ukusebenza kokushisa okuphezulu kuncipha. Ngokuvumelana nalokho, ukulawula ngokuqinile okuqukethwe kwama-oxide angcolile, ikakhulukazi okuqukethwe kwe-K2O, Na2O kanye ne-Fe2O3, kuyisilinganiso esibalulekile sokuthola izitini ze-mullite ezisebenza kahle nezihlanzekile kakhulu. Isetshenziswa endaweni ye-slag noma yegesi equkethe izingxenye ze-alkali, inomthelela ombi kakhulu ezitini eziphikisayo ze-mullite.