Cov txheej txheem hardness thiab brittleness ntawm alumina ceramics yog qhia

Alumina ceramics feem ntau muaj, thiab siv lead ua morphology, ntawm cov uas -Al203 siv lead ua morphology yog qhov ruaj khov, ntawm 1300 degree I3 thiab muaju yuav luag tag nrho hloov mus rau hauv cov muaju. Nyob rau hauv daim ntawv siv lead ua ntawm -Al203, cov atomic bonds tsim los ntawm txhuas ion thiab oxygen ion feem ntau covalent bonds, ionic bonds los yog lawv cov sib tov bonds, yog li cov interatomic binding zog yog siab heev thiab muaj zog directivity.

Raws li ib txwm muaj, lub microstructure ntawm alumina ceramics yog equiaxed nplej, uas yog polycrystalline cov qauv tsim los ntawm ionic bonds los yog covalent bonds. Yog li ntawd, lub pob txha toughness yog tsawg. Nyob rau hauv qhov kev txiav txim ntawm kev thauj khoom sab nraud, kev ntxhov siab yuav ua rau cov nplais ceramic tsim cov kab nrib pleb zoo.

Cov kab nrib pleb yuav nthuav dav sai sai thiab tshwm sim tawg tawg, yog li nyob rau hauv cov txheej txheem txiav ntawm alumina ceramics, feem ntau tshwm sim vau thiab meej tshwm sim, uas yog, muaj cov kab nrib pleb me me ntawm cov nplais ceramic.

Nws qhov kev ua tau zoo tshwj xeeb yog cov khoom siv tawv tawv, cov yas deformation yog me me, yooj yim rau tawg, nws cov hardness yog sib npaug rau cov hardness ntawm carbide hard alloy, ob peb zaug siab dua hlau.

Feem ntau, siab purity alumina ceramics ceev mus txog 3980 (kg-M4), tensile zog mus txog 260 (MPa), elastic modulus ntawm 350-400(Gpa), compressive zog ntawm 2930 (MPa), tshwj xeeb tshaj yog nws hardness mus txog 99HRA .