Alumina thiab zirconia yog ob cov ntaub ntawv ceramic uas pom kev siv dav hauv ntau qhov kev lag luam vim lawv cov khoom tshwj xeeb. Ob qho khoom siv muaj cov yam ntxwv sib txawv uas ua rau lawv haum rau cov hom phiaj sib txawv, thiab kev sib piv ntawm alumina thiab zirconia tuaj yeem pab nkag siab txog lawv lub zog thiab kev txwv.
Cov khoom ntawm Alumina Ceramic
Alumina, tseem hu ua aluminium oxide (Al2O3), yog cov khoom siv dav siv hauv ceramic nrog ntau yam kev siv. Nws yog lub npe hu rau nws zoo heev mechanical thiab thermal zog. Alumina yog qhov hnav-tiv taus, ua rau nws zoo tagnrho rau cov ntawv thov uas yog qhov tseem ceeb heev, xws li hauv kev tsim cov khoom hnav-tiv taus, cov cuab yeej txiav, thiab kev sib tsoo xov xwm. Nws cov thermal conductivity siab kuj ua rau nws haum rau siv nyob rau hauv high-temperature ib puag ncig. Tsis tas li ntawd, alumina muaj cov khoom siv hluav taws xob zoo, ua rau nws muaj txiaj ntsig hauv kev tsim cov khoom siv hluav taws xob.
Cov khoom ntawm Zirconia Ceramic
Ntawm qhov tod tes, zirconia, lossis zirconium dioxide (ZrO2), yog lwm cov khoom siv ceramic uas sawv tawm rau nws cov khoom sib xyaw ua ke ntawm cov khoom siv thiab thermal. Zirconia nthuav tawm lub zog siab, toughness, thiab hardness, ua rau nws tsim nyog rau cov ntawv thov uas cov khoom no tseem ceeb, xws li hauv kev tsim cov hniav cog hniav, pob bearings, thiab cov cuab yeej txiav. Zirconia kuj tseem muaj kev tiv thaiv zoo rau thermal poob siab, tso cai rau nws tiv taus qhov kub thiab txias hloov pauv yam tsis muaj tawg. Tsis tas li ntawd, zirconia muaj cov thermal conductivity tsawg, uas tuaj yeem ua tau zoo dua hauv qee qhov kev siv insulating.
Qhov txawv tseem ceeb
Ib qho tseem ceeb sib txawv ntawm alumina thiab zirconia nyob hauv lawv cov kev hloov pauv hauv kev ntxhov siab. Zirconia ua rau muaj kev hloov pauv theem (tetragonal rau monoclinic) thaum raug kev nyuaj siab, ua rau muaj qhov tshwm sim hu ua transformation toughening. Qhov no transformation toughening mechanism imparts ntxiv toughness rau zirconia, ua rau nws ntau resistant rau tawg propagation piv rau alumina. Yog li ntawd, zirconia feem ntau nyiam nyob rau hauv cov ntawv thov uas tsis kam tiv thaiv kev puas tsuaj yog qhov tseem ceeb.
Hauv cov ntsiab lus, thaum ob qho tib si alumina thiab zirconia yog cov khoom siv ceramic muaj txiaj ntsig nrog cov khoom zoo, kev xaiv ntawm lawv yog nyob ntawm cov kev cai tshwj xeeb ntawm daim ntawv thov. Alumina nyiam rau nws cov hnav tsis kam, thermal conductivity, thiab hluav taws xob insulating zog, thaum zirconia excels nyob rau hauv cov ntaub ntawv uas siab zog, toughness, thiab tsis kam mus tawg yog ib qho tseem ceeb heev. Qhov kev txiav txim siab ntawm alumina thiab zirconia thaum kawg hinges ntawm kev npaj siv thiab cov kev xav tau tshwj xeeb ntawm ib puag ncig uas cov ntaub ntawv no yuav ua haujlwm.
