Alumina ceramic yog ib yam khoom siv ua haujlwm siab uas paub zoo txog nws qhov Mohs hardness ntawm 9. Cov yam ntxwv no ua rau nws yog qhov kev xaiv zoo tshaj plaws rau cov ntawv thov uas nyuaj, tshwj xeeb tshaj yog nyob rau hauv cov xwm txheej ntawm kev puas tsuaj, xeb, thiab kub siab. Tsab xov xwm no tshawb nrhiav keeb kwm ntawm nws qhov kev nyuaj siab thiab qhov ua tau zoo tshwj xeeb.
Qhov nyuaj siab ntawm alumina ceramic los ntawm nws cov qauv siv lead ua tshwj xeeb thiab kev sib txuas tshuaj lom neeg. Nws cov khoom tseem ceeb, α-alumina (α-Al₂O₃), siv cov qauv corundum uas muaj cov pa oxygen thiab txhuas ions sib txuas los ntawm kev sib cuam tshuam ionic thiab covalent muaj zog. Qhov kev sib txuas no muab lub zog lattice siab, ua rau cov khoom siv tiv taus kev hloov pauv yas thiab tawg hauv qab kev ntxhov siab sab nraud. Ntxiv mus, cov khoom siv raw khoom huv si thiab cov txheej txheem sintering siab heev tshem tawm cov teeb meem me me, txhim kho qhov ceev thiab qhov nyuaj.
Qhov nyuaj siab ncaj qha txhais tau tias muaj kev ua tau zoo heev. Nws qhov kev tiv thaiv kev hnav zoo ua rau nws siv tau dav hauv cov tshuab tuav thee hauv cov chaw tsim hluav taws xob thermal, cov khoom siv sintering thiab cov khoom siv tshem tawm plua plav hauv cov chaw tsim hlau, cov kav dej thauj hlau hauv kev tsuas, cov hmoov nplej nyoos thiab cov tshuab sib tsoo clinker hauv cov chaw tsim cement, thiab cov khoom siv thauj hmoov hauv kev lag luam tshuaj lom neeg, ua tau zoo dua li cov hlau ib txwm muaj hauv kev siv lub neej. Tsis tas li ntawd, cov khoom siv no ua rau muaj kev tiv thaiv kev xeb tshuaj zoo heev, tiv taus cov kua qaub, alkalis, thiab cov kuab tshuaj organic. Thaum kub siab, alumina ceramic tswj tau cov khoom siv kho tshuab thiab tshuaj lom neeg ruaj khov, ua haujlwm tau zoo tshaj 1600 ° C. Tsis tas li ntawd, qhov nyuaj siab pab txhawb rau kev rwb thaiv hluav taws xob zoo heev thiab kev ua haujlwm thermal qis, ua rau nws tsim nyog rau cov khoom siv hluav taws xob thiab cov khoom siv tswj thermal.
Hauv kev xaus,alumina ceramics, nrog nws qhov Mohs hardness ntawm 9, ua lub luag haujlwm tseem ceeb hauv kev lag luam thiab kev siv tshuab. Nws qhov kev tiv thaiv kev hnav thiab kev xeb zoo dua, kev ruaj khov kub siab, thiab cov khoom rwb thaiv hluav taws xob ua rau nws yog cov khoom siv tseem ceeb rau kev tsim khoom siab heev thiab cov thev naus laus zis tshiab. Raws li cov txheej txheem ua khoom txuas ntxiv mus, cov kev cia siab ntawm daim ntawv thov ntawm alumina ceramic yuav nthuav dav ntxiv.
Lub sijhawm tshaj tawm: Lub Kaum Hli-28-2025