Magnesium aluminium spinel (MgAl2O, MgO·Al2Oor MA) muaj qhov zoo tshaj qhov kub thiab txias txhua yam khoom, zoo heev tev thiab corrosion kuj. Nws yog qhov zoo tshaj plaws kub kub ceramic hauv Al2O-MgO system. Qhov zoo tshaj plaws kev loj hlob ntawm calcium hexaaluminate (CaAl12O19, CaO·6AlO lossis CA6) siv lead ua nplej raws lub dav hlau basal ua rau nws loj hlob mus rau hauv platelet lossis koob morphology, uas tuaj yeem txhim kho qhov tawv ntawm cov khoom. Calcium dialuminate (CaAlO lossis CaO·2Al203, CA2) muaj cov coefficient tsawg ntawm thermal expansion. Thaum CAz yog compounded nrog lwm cov ntaub ntawv uas muaj siab melting point thiab siab coefficient ntawm expansion, nws muaj peev xwm tiv taus kev puas tsuaj los ntawm thermal shock. Yog li ntawd, MA-CA composites tau txais kev saib xyuas dav dav raws li hom tshiab ntawm cov khoom siv kub kub kub hauv kev lag luam kub vim nws cov khoom zoo ntawm CA6 thiab MA.
Hauv daim ntawv no, MA ceramic, MA-CA2-CA ceramic composites thiab MA-CA ceramic composites tau npaj los ntawm kev kub siab kub-theem sintering, thiab kev cuam tshuam ntawm mineralizers ntawm cov khoom ntawm cov ntaub ntawv ceramic tau kawm. Cov txheej txheem ntxiv dag zog ntawm cov ntxhia pob zeb hauv kev ua haujlwm ntawm ceramics tau tham txog, thiab cov txiaj ntsig kev tshawb fawb hauv qab no tau txais:
(1) Cov txiaj ntsig tau pom tias qhov ntom ntom thiab Flexural zog ntawm Ma cov ntaub ntawv ceramic nce maj nrog qhov nce ntawm sintering kub. Tom qab sintering ntawm 1600 rau 2hthe sintering kev ua tau zoo ntawm MA ceramic yog pluag, nrog ib tug loj ceev ntawm 3. 17g / cm3 thiab ib tug flexural zog tus nqi ntawm 133. 31 MPa. Nrog rau qhov nce ntawm cov ntxhia pob zeb Fez03, qhov ntom ntom ntawm MA cov ntaub ntawv ceramic tau nce zuj zus, thiab lub zog flexural thawj zaug nce thiab tom qab ntawd txo qis. Thaum tus nqi ntxiv yog 3 wt. %, lub zog flexural mus txog qhov siab tshaj 209. 3MPa.
(2) Kev ua tau zoo thiab theem muaj pes tsawg leeg ntawm MA-CA6 ceramic muaj feem xyuam rau qhov loj me ntawm CaCO thiab a-AlO raw cov ntaub ntawv, purity ntawm a- Al2O3, qhov kub thiab txias ntawm synthesis thiab tuav lub sij hawm. Siv cov khoom me me me me CaCO thiab siab purity a-AlzO3 raws li cov khoom siv raw, tom qab sintering ntawm 1600 ℃ thiab tuav rau 2h, cov khoom siv hluavtaws MA-CA6 ceramic muaj zog flexural zoo. Qhov loj me me ntawm CaCO3 ua lub luag haujlwm tseem ceeb hauv kev tsim CA theem thiab kev loj hlob thiab kev loj hlob ntawm cov khoom siv lead ua hauv MA-CA6 cov ntaub ntawv ceramic. Thaum kub siab, lub impurity Si nyob rau hauv a-Alz0 yuav tsim ib ntus kua theem, uas ua rau lub morphology ntawm CA6 nplej evolve los ntawm platelet mus rau equiaxed.
(3) Cov nyhuv ntawm mineralizers ZnO thiab Mg (BO2)z ntawm cov khoom ntawm MA-CA composites thiab cov txheej txheem ntxiv dag zog tau tshawb xyuas. Nws tau pom tias (Mg-Zn) AI2O4 cov tshuaj tov thiab boron-muaj kua theem tsim los ntawm cov mineralizers ZnO thiab Mg (BO2)z ua rau cov nplej loj ntawm MA me thiab cov ntsiab lus ntawm MA nce. Cov theem ntom ntom no yog coated nrog microcrystalline ma hais los ua cov kev hloov pauv ceev, yog li txhawb cov ntaub ntawv ntawm Ma-Ce Ceramic thiab txhim kho nws lub zog ntawm Flexural.
(4) Los ntawm kev siv analytically ntshiab Al2Oinstead ntawm a-AlzO, MA-CA2-CA ceramic composites tau synthesized los ntawm analytically ntshiab raw cov ntaub ntawv. Cov teebmeem ntawm cov mineralizers SnO₂ thiab HBO ntawm lub cev thiab cov khoom siv kho tshuab, microstructure thiab theem ntawm cov khoom sib xyaw tau kawm.
Cov txiaj ntsig tau pom tias cov khoom siv tshuaj thiab cov boron-muaj cov kua dej hloov pauv tshwm sim hauv cov khoom siv ceramic tom qab ntxiv cov ntxhia pob zeb SnO2 thiab H2BO ; Feem ntau, nws ua rau CA2 theem hloov mus rau CA theem thiab ua kom lub cev muaj zog ntawm MA thiab CA6, yog li txhim kho cov haujlwm sintering ntawm cov khoom siv ceramic. Cov theem ntom ntom tsim los ntawm Ca ntau dhau ua rau kev sib cog lus ntawm MA thiab CA6 cov nplej nruj, uas txhim kho cov khoom siv ntawm cov khoom siv ceramic.
Post lub sij hawm: Aug-29-2023