I-Magnesium aluminium spinel(MgAl2O, MgO·Al2Oor MA) inezici zomshini ezisezingeni eliphezulu lokushisa eliphezulu, ukumelana okuhle kakhulu nokuxebuka kanye nokumelana nokugqwala.Kuyi-ceramic ejwayelekile yokushisa ephezulu ohlelweni lwe-Al2O-MgO.Ukukhula okukhethekile kwe-calcium hexaaluminate (CaAl12O19, CaO·6AlO noma CA6) izinhlamvu zekristalu eduze kwendiza ye-basal kuyenza ikhule ibe i-platelet noma i-morphology yenaliti, engathuthukisa kakhulu ukuqina kwento.I-Calcium dialuminate(CaAlO noma i-CaO·2Al203, CA2)ine-coefficient ephansi yokunwetshwa kwe-thermal.Lapho i-CAz ihlanganiswa nezinye izinto ezinezinga eliphezulu lokuncibilika kanye ne-coefficient ephezulu yokwandisa, ingamelana nomonakalo obangelwa ukushaqeka okushisayo.Ngakho-ke, izinhlanganisela ze-MA-CA zithole ukunakwa okubanzi njengohlobo olusha lwempahla ye-ceramic yokushisa okuphezulu embonini yokushisa okuphezulu ngenxa yezakhiwo zayo ezibanzi ze-CA6 ne-MA.
Kuleli phepha, izinhlanganisela ze-ceramic ze-MA, i-MA-CA2-CA kanye nezinhlanganisela ze-ceramic ze-MA-CA zalungiswa ngokushisa okuphezulu kwe-solid-phase sintering, futhi ithonya lama-mineralizers ezindaweni zalezi zinto zobumba zafundwa.Kwaxoxwa ngendlela yokuqinisa ama-mineralizers ekusebenzeni kwezitsha zobumba, futhi kwatholakala imiphumela yocwaningo elandelayo:
(1) Imiphumela yabonisa ukuthi ukuminyana ngobuningi namandla okuguquguquka kwezinto ze-ceramic ye-MA kwanda kancane kancane ngokwanda kwezinga lokushisa le-sintering.Ngemva kokushisa ku-1600 ku-2hthe ukusebenza kwe-sintering ye-MA yobumba bekungekuhle, nokuminyana kwenqwaba okungu-3. 17g/cm3 kanye nevelu yamandla eguquguqukayo engu-133.31MPa.Ngokukhula kwe-mineralizer Fez03, ukuminyana kwenqwaba yezinto ze-ceramic ye-MA kukhula kancane kancane, futhi amandla okuguquguquka aqale akhuphuka bese ehla.Lapho inani elingeziwe lalingu-3wt.%, amandla okuguquguquka afinyelele ku-209. 3MPa.
(2)Ukusebenza nokwakheka kwesigaba se-MA-CA6 ceramic kuhlobene nosayizi wezinhlayiyana ze-CaCO kanye ne-a-AlO izinto zokusetshenziswa, ubumsulwa be-a- Al2O3, izinga lokushisa lokuhlanganiswa kanye nesikhathi sokubamba.Isebenzisa usayizi wezinhlayiyana ezincane i-CaCO kanye nokuhlanzeka okuphezulu kwe-a-AlzO3 njengezinto zokusetshenziswa, ngemva kokucwiliswa ku-1600 ℃ nokubamba i-2h, i-ceramic ye-MA-CA6 ehlanganisiwe inamandla amakhulu okuguquguquka.Usayizi wezinhlayiyana ze-CaCO3 udlala indima ebalulekile ekwakhekeni kwesigaba se-CA kanye nokukhula nokuthuthukiswa kwezinhlamvu zekristalu kuzinto zobumba ze-MA-CA6.Emazingeni okushisa aphezulu, ukungcola kuka-Si ku-a-Alz0 kuzokwakha isigaba soketshezi esidlulayo, okwenza i-morphology yezinhlamvu ze-CA6 ziguquke ukusuka ku-platelet kuye ku-equiaxed.
(3)Umphumela wabadidiyeli bamaminerali i-ZnO ne-Mg(BO2)z ezakhiweni zezinhlanganisela ze-MA-CA kanye nendlela yokuqinisa yaphenywa.Kutholakala ukuthi(Mg-Zn)AI2O4 isixazululo esiqinile kanye nesigaba soketshezi esiqukethe i-boron esakhiwe amaminerali i-ZnO kanye ne-Mg(BO2)z yenza usayizi wokusanhlamvu we-MA ube mncane futhi okuqukethwe kwe-MA kukhuphuke.Lezi zigaba eziminyene zimbozwe ngezinhlayiya ze-microcrystalline MA ukuze zakhe imizimba eminyene yesifunda ehlakazekile, okuholela ekuguqulweni kwezinhlamvu ze-CA6 zibe izinhlamvu ezilinganayo, ngaleyo ndlela kuthuthukiswe ukuminyana kwezinto zobumba ze-MA-CA futhi kuthuthukise amandla ayo okuguquguquka.
(4)Ngokusebenzisa i-Al2Oinstead of a-AlzO, izinhlanganisela ze-ceramic ze-MA-CA2-CA zahlanganiswa kusuka ezintweni ezingasetshenzisiwe ezingahlanzekile.Imiphumela ye-mineralizers i-SnO₂ ne-HBO ezintweni ezibonakalayo nezomshini, i-microstructure kanye nokwakheka kwesigaba sezinhlanganisela kwafundwa.
Imiphumela ibonisa ukuthi isixazululo esiqinile kanye nesigaba soketshezi lwesikhashana esiqukethe i-boron sivela ezintweni ze-ceramic ngemva kokwengeza ama-mineralizers SnO2 kanye ne-H2BO;ngokulandelana, kwenza isigaba se-CA2 siguqukele kusigaba se-CA futhi sisheshise ukwakheka kwe-MA ne-CA6, ngaleyo ndlela sithuthukise umsebenzi we-sintering wezinto zobumba.Isigaba esiminyene esakhiwe yi-Ca eyeqile senza isibopho phakathi kwezinhlamvu ze-MA ne-CA6 ziqine, okuthuthukisa izakhiwo zemishini zezinto zobumba.
Isikhathi sokuthumela: Aug-29-2023