Qhov twg yog qhov nyuaj ntawm kev siv tshuab ua haujlwm ntawm alumina ceramics cuam tshuam

99 alumina ceramics hais txog engineering ceramics nrog cov ntsiab lus alumina siab dua 99%. Raws li tus qauv, 99 alumina ceramic khoom muaj siab hardness, lub zog, tsis tshua muaj expansion coefficient, rwb thaiv tsev, hnav tsis kam, thiab corrosion kuj. Nws muaj ntau yam kev siv hauv kev tsim khoom, aerospace, precision instruments, petrochemicals, thiab lwm yam.
Aluminium oxide ceramic feem ntau yog tsim los ntawm kub nias sintering. Vim lub deformation thiab shrinkage tshwm sim los ntawm sintering, ntxiv precision machining yog feem ntau yuav tsum tau los xyuas kom meej qhov seem thiab cov duab raug ntawm qhov chaw. Txawm li cas los xij, cov ntaub ntawv alumina ceramic feem ntau muaj cov qauv elastic, siab hardness, siab brittleness, thiab muaj zog tawg rhiab heev. Yog li ntawd, lawv cov neeg kho tshuab ua nyuaj feem ntau manifests nyob rau hauv ua hardness thiab brittleness.
AL203 feem ntau muaj peb hom siv lead ua: alpha, beta, thiab gamma. Ntawm lawv, alpha AL203 siv lead ua daim ntawv yog ruaj khov, thiab ntawm 1300 degree, I3 thiab gamma crystals yuav luag tag nrho hloov mus rau alpha muaju. Nyob rau hauv daim ntawv crystalline ntawm - AL203, cov atomic bonds tsim ntawm txhuas ions thiab oxygen ions feem ntau covalent, ionic, los yog sib tov bonds. Yog li ntawd, lub zog khi ntawm atoms yog siab thiab muaj zog directionality, uas yog manifested raws li cov khoom siab brittleness, me me yas deformation, thiab yooj yim tawg.
Nws hardness yog sib npaug ntawm cov carbide nyuaj alloys, ob peb zaug siab dua cov hlau. Feem ntau, high-purity alumina ceramics muaj qhov ntom ntawm 3980 (Kg-m4), lub zog tensile ntawm 260 (MPa), elastic modulus ntawm 350-400 (GPa), lub zog compressive ntawm 2930 (MPa), thiab hardness ntawm 99HRA. Lub zog thiab hardness ntawm 99 alumina ceramics tau txo qis, thiab raws li peb cov kev ntsuas ntawm cov qauv kev sim, lawv hardness ntawm chav tsev kub kuj tau mus txog 70HRA.
Nyob rau hauv ib txwm muaj xwm txheej, lub microstructure ntawm alumina ceramics yog equiaxed nplej, uas yog polycrystalline lug tsim los ntawm ionic los yog covalent bonds. Yog li ntawd, lub pob txha toughness yog tsawg. Nyob rau hauv cov khoom siv sab nraud, kev ntxhov siab tuaj yeem ua rau cov kab nrib pleb zoo ntawm cov nplais ceramic, uas tuaj yeem nthuav tawm sai thiab ua rau tawg tawg. Yog li ntawd, thaum lub sij hawm txiav cov txheej txheem ntawm alumina ceramics, qhov tshwm sim ntawm lub cev qhuav dej feem ntau tshwm sim, uas yog, cov kab nrib pleb me me tshwm sim ntawm qhov chaw ceramic.