Toughening txoj kev ntawm zirconia ceramics

Zirconia yog cov khoom siv tshwj xeeb. Txoj kev toughening feem ntau yog ua tiav los ntawm kev siv cov theem hloov ntawm zirconia! Ntshiab zirconia yog cov khoom dawb, thiab nws yuav tshwm grey los yog lub teeb daj thaum nws muaj impurities. Muaj ntau yam xim muaj tshwm sim. Qhov hnyav molecular ntawm ntshiab zirconia yog 123.22, theoretical ntom yog 5.89g / cm3, thiab lub melting point yog 2715 degree. Feem ntau muaj me me ntawm hafnium oxide, uas nyuaj rau kev sib cais, tab sis tsis muaj qhov cuam tshuam loj rau cov khoom ntawm zirconium oxide. Muaj peb hom siv lead ua zirconia: monoclinic, tetragonal, thiab cubic. Nyob rau hauv chav tsev kub, zirconia tsuas yog tshwm sim raws li ib tug monoclinic theem, thiab thaum rhuab mus txog 1100 degree, nws hloov mus rau hauv ib tug tetragonal theem, thiab thaum rhuab mus rau ib tug ntau dua kub, nws transforms mus rau hauv lub cubic theem. Txij li thaum lub ntim loj hloov tau tshwm sim thaum lub sijhawm monoclinic hloov mus rau theem tetragonal, thiab qhov hloov pauv loj tshwm sim nyob rau hauv qhov kev taw qhia thaum txias, nws yooj yim ua rau tawg ntawm cov khoom, uas txwv tsis pub siv cov ntshiab zirconia nyob rau hauv qhov kub thiab txias. . . Txawm li cas los xij, tom qab ntxiv cov stabilizer, tetragonal theem tuaj yeem ruaj khov ntawm chav tsev kub, yog li yuav tsis muaj qhov hloov pauv tam sim ntawd hauv ntim tom qab cua sov, uas nthuav dav ntau yam ntawm zirconia. Cov khoom siv raw siv los ua kom ruaj khov ntawm kev ua lag luam feem ntau yog yttrium oxide.