Magnesium aluminium spinel(MgAl2O, MgO · Al2Oor MA) e na le lisebelisoa tse phahameng ka ho fetisisa tsa mocheso o phahameng, ho hanyetsa ha letlalo le ho hanyetsa ho bola. Ke ceramic e tloaelehileng ea mocheso o phahameng ka ho fetisisa tsamaisong ea Al2O-MgO. Khōlo e khethehileng ea calcium hexaaluminate (CaAl12O19, CaO · 6AlO kapa CA6) lijo-thollo tsa kristale haufi le sefofane sa basal se etsa hore e hōle ho ba platelet kapa nale morphology, e ka ntlafatsang haholo ho tiea ha thepa. Calcium dialuminate(CaAlO kapa CaO·2Al203, CA2) e na le coefficient e tlase ea katoloso ea mocheso. Ha CAz e kopantsoe le lisebelisoa tse ling tse nang le ntlha e phahameng ea ho qhibiliha le coefficient e phahameng ea ho atolosoa, e ka hanela tšenyo e bakiloeng ke mocheso oa mocheso. Ka hona, lihlopha tsa MA-CA li fumane tlhokomelo e pharaletseng e le mofuta o mocha oa thepa ea ceramic ea mocheso o phahameng indastering ea mocheso o phahameng ka lebaka la thepa ea eona e pharaletseng ea CA6 le MA.
Ka pampiri ena, li-composite tsa MA-CA2-CA tsa ceramic le likarolo tsa MA-CA tsa ceramic li ne li lokiselitsoe ke mocheso o phahameng oa sintering, 'me ho ile ha ithutoa tšusumetso ea liminerale ka thepa ea lisebelisoa tsena tsa ceramic. Ho ile ha buisanoa ka mokhoa o matlafatsang oa liminerale tšebetsong ea lirafshoa, 'me ho ile ha fumanoa liphetho tse latelang tsa lipatlisiso:
(1) Liphello li bontšitse hore bongata bo bongata le matla a feto-fetohang a thepa ea ceramic ea MA e ile ea eketseha butle-butle ka ho eketseha ha mocheso oa sintering. Ka mor'a ho sintering ho 1600 bakeng sa ts'ebetso ea 2hthe sintering ea MA ceramic e ne e futsanehile, e nang le boima bo bongata ba 3. 17g / cm3 le matla a flexural a bohlokoa a133. 31MPa. Ka keketseho ea mineralizer Fez03, bongata bo bongata ba lisebelisoa tsa ceramic tsa MA bo ile ba eketseha butle-butle, 'me matla a flexural a qala ho eketseha ebe a fokotseha. Ha chelete ea tlatsetso e ne e le 3wt. %, matla a feto-fetohang a fihlile ho boholo ba 209. 3MPa.
(2) Ts'ebetso le sebopeho sa mohato oa MA-CA6 ceramic li amana le boholo ba likaroloana tsa CaCO le a-AlO lisebelisoa tse tala, bohloeki ba a-Al2O3, mocheso oa motsoako le nako ea ho ts'oara. E sebelisa boholo ba likaroloana tsa CaCO le bohloeki bo phahameng a-AlzO3 e le lisebelisoa tse tala, ka mor'a ho sintering ho 1600 ℃ le ho tšoara 2h, ceramic MA-CA6 e entsoeng e na le matla a maholo a ho feto-fetoha. Boholo ba likaroloana tsa CaCO3 bo phetha karolo ea bohlokoa ho thehoeng ha karolo ea CA le kholo le nts'etsopele ea lijo-thollo tsa kristale ka thepa ea ceramic ea MA-CA6. Ka mocheso o phahameng, litšila tsa Si ho a-Alz0 li tla theha mokelikeli oa nakoana, o etsang hore morphology ea lithollo tsa CA6 e fetohe ho tloha ho platelet ho ea ho equiaxed.
(3) Phello ea liminerale ZnO le Mg(BO2)z ho thepa ea metsoako ea MA-CA le mokhoa oa ho matlafatsa li ile tsa fuputsoa. Ho fumanoa hore (Mg-Zn) AI2O4 tharollo e tiileng le mohato oa mokelikeli o nang le boron o entsoeng ke liminerale ZnO le Mg (BO2) z li etsa hore boholo ba lijo-thollo tsa MA bo fokotsehe 'me litaba tsa MA li eketsehe. Mehato ena e teteaneng e koahetsoe ka likaroloana tsa microcrystalline MA ho theha 'mele e teteaneng ea libaka, e lebisang phetohong ea lijo-thollo tsa CA6 hore e be lijo-thollo tse lekanang, kahoo e khothalletsa ho teteka ha lisebelisoa tsa ceramic tsa MA-CA le ho ntlafatsa matla a eona a ho fetoha.
4 Liphello tsa mineralizers SnO₂ le HBO holim'a thepa ea 'mele le ea mechine, microstructure le karolo ea likarolo tsa lihlopha li ile tsa ithutoa.
Liphello li bontša hore tharollo e tiileng le karolo ea mokelikeli oa nakoana e nang le boron e hlaha ka har'a thepa ea ceramic ka mor'a ho eketsa mineralizers SnO2 le H2BO; ka ho latellana, e etsa hore karolo ea CA2 e fetohe ho ea karolong ea CA mme e potlakisa ho thehoa ha MA le CA6, kahoo e ntlafatsa mosebetsi oa sintering oa thepa ea ceramic. Karolo e teteaneng e entsoeng ke Ca e feteletseng e etsa hore maqhama pakeng tsa MA le CA6 a tiee, e leng ho ntlafatsang thepa ea mochine oa thepa ea ceramic.
Nako ea poso: Aug-29-2023