I-Magnesium aluminiyam spinel(MgAl2O, MgO · Al2Oor MA) ineempawu eziphezulu zobushushu obuphezulu bomatshini, ukuxhathisa okugqwesileyo kunye nokuxhathisa ukubola.Yeyona ndawo iqhelekileyo yobushushu beceramic kwi-Al2O-MgO system.Ukukhula okukhethiweyo kwe-calcium hexaaluminate (CaAl12O19, CaO · 6AlO okanye CA6) iinkozo zekristale ecaleni kwendiza ye-basal yenza ukuba ikhule ibe yiplatelet okanye i-morphology yenaliti, enokuphucula kakhulu ukuqina kwezinto.I-Calcium dialuminate(CaAlO okanye i-CaO · 2Al203, CA2) ine-coefficient ephantsi yokwandiswa kwe-thermal.Xa i-CAz idityaniswe nezinye izinto ezinomgangatho ophezulu wokunyibilika kunye ne-coefficient ephezulu yokwandiswa, inokuxhathisa kakuhle umonakalo obangelwa kukutshatyalaliswa kwe-thermal.Ke ngoko, imidibaniso ye-MA-CA ifumene ingqwalasela ebanzi njengodidi olutsha lwemathiriyeli ye-ceramic yobushushu obuphezulu kwishishini lobushushu obuphezulu ngenxa yeepropathi zayo ezibanzi ze-CA6 kunye ne-MA.
Kweli phepha, i-MA-ceramics, i-MA-CA2-CA i-ceramic compotes kunye ne-MA-CA i-ceramic composites yalungiswa ngobushushu obuphezulu be-sintering ye-sintering, kunye nefuthe le-mineralizers kwiipropati zezi zinto ze-ceramic zafundwa.Kwaxoxwa ngendlela yokomeleza izimbiwa ekusebenzeni kweeseramikhi, kwaye ezi ziphumo zophando zilandelayo zafunyanwa:
(1) Iziphumo zibonise ukuba ubuninzi bobuninzi kunye namandla aguquguqukayo ezinto ze-ceramic ze-MA zanda ngokuthe ngcembe ngokunyuka kobushushu be-sintering.Emva kwe-sintering kwi-1600 ye-2hthe ukusebenza kwe-sintering ye-MA ye-ceramic yayimpofu, kunye nobuninzi be-3. 17g / cm3 kunye nexabiso le-flexural lamandla e-133.31MPaNgokunyuka kwe-mineralizer Fez03, ubuninzi bezinto ze-ceramic ze-MA zanda ngokuthe ngcembe, kwaye amandla e-flexural aqala ukwanda kwaye ayancipha.Xa imali eyongeziweyo yayiyi-3wt.%, amandla okuguquguquka afikelele kubuninzi be-209. 3MPa.
(2) Ukusebenza kunye nokubunjwa kwesigaba se-MA-CA6 i-ceramic ihambelana nobukhulu be-particle ye-CaCO kunye ne-a-AlO izinto eziluhlaza, ukucoceka kwe-a-Al2O3, ukushisa kwe-synthesis kunye nexesha lokubamba.Ukusebenzisa i-particle encinci ye-CaCO kunye nokucoceka okuphezulu kwe-a-AlzO3 njengezinto eziluhlaza, emva kokutshisa kwi-1600 ℃ kunye nokubamba i-2h, i-ceramic ye-MA-CA6 eyenziweyo inamandla amakhulu okuguquguquka.Ubungakanani be-particle ye-CaCO3 idlala indima ebalulekileyo ekubunjweni kwesigaba se-CA kunye nokukhula kunye nophuhliso lwe-crystal grains kwi-MA-CA6 izinto ze-ceramic.Kwiqondo lokushisa eliphezulu, ukungcola kwe-Si kwi-a-Alz0 kuya kwenza isigaba solwelo esidlulayo, esenza ukuba i-morphology yeenkozo ze-CA6 ziguquke ukusuka kwiplatelet ukuya kwi-equiaxed.
(3)Impembelelo yezimbiwa i-ZnO kunye ne-Mg(BO2)z kwiipropati ze-MA-CA composites kunye nendlela yokomeleza ziye zaphandwa.Kufunyenwe ukuba (i-Mg-Zn) i-AI2O4 isisombululo esiluqilima kunye nesigaba solwelo esine-boron esakhiwe yi-mineralizers i-ZnO kunye ne-Mg (BO2) z yenza ubungakanani beenkozo ze-MA zibe zincinci kunye nomxholo we-MA wanda.Ezi zigaba ezixineneyo zigqunywe ngamasuntswana e-MA microcrystalline ukwenza imizimba exineneyo yengingqi, ekhokelela ekuguqulweni kweenkozo ze-CA6 zibe ziinkozo ezilinganayo, ngaloo ndlela zikhuthaza ukuxinana kwezixhobo ze-ceramic ze-MA-CA kunye nokuphucula amandla ayo aguquguqukayo.
(4) Ngokusebenzisa uhlalutyo olusulungekileyo i-Al2Oinstead ye-a-AlzO, i-MA-CA2-CA imidibaniso ye-ceramic yadityaniswa ukusuka kuhlalutyo olusulungekileyo lwemathiriyeli ekrwada.Imiphumo ye-mineralizers SnO₂ kunye ne-HBO kwizinto eziphathekayo kunye nezixhobo, i-microstructure kunye nokwakhiwa kwesigaba se-composites yafundwa.
Iziphumo zibonisa ukuba isisombululo esiqinileyo kunye ne-boron-equkethe isigaba se-liquid edlulayo sibonakala kwi-ceramic material emva kokongeza i-mineralizers SnO2 kunye ne-H2BO;ngokulandelanayo, yenza ukuba isigaba se-CA2 sitshintshe kwisigaba se-CA kwaye sikhawuleze ukubunjwa kwe-MA kunye ne-CA6, ngaloo ndlela kuphuculwe umsebenzi we-sintering we-ceramic material.Isigaba esishinyeneyo esenziwe yi-Ca engaphezulu senza ukuba ikhonkco phakathi kwe-MA kunye ne-CA6 ibe nzima, ephucula iimpawu zomatshini wezinto ze-ceramic.
Ixesha lokuposa: Aug-29-2023