Aluminium oxide (Al2O3), feem ntau hu ua alumina, yog ntau yam khoom siv ceramic nrog ntau yam khoom uas ua rau nws haum rau ntau yam kev lag luam. Nws nthuav tawm cov yam ntxwv tshwj xeeb uas ua rau nws siv dav hauv ntau hom. Ntawm no qhia txog cov neeg kho tshuab, thermal, hluav taws xob, thiab cov yam ntxwv kho qhov muag ntawm Al2O3 ceramic.
1. Mechanical Properties
- Hardness
Aluminium oxide muaj npe nrov rau nws qhov tshwj xeeb hardness, qeb duas ntawm pob zeb diamond ntawm Mohs nplai. Cov cuab yeej no ua rau nws tiv taus kev puas tsuaj, yog ib qho tseem ceeb rau cov ntawv thov raug hnav thiab kev sib txhuam. Hauv cov chaw tsim khoom, cov ntaub ntawv raug siv los ua abrasive, xws li cov cuab yeej txiav thiab kev sib tsoo, tau txais txiaj ntsig los ntawm hardness ntawm Al2O3.
Lub zog thiab nruj
Alumina yog tus cwj pwm los ntawm lub zog siab thiab nruj, ua rau nws tsim nyog rau kev siv cov qauv. Nws lub peev xwm los tiv thaiv kev ntxhov siab ua rau nws yog qhov kev xaiv zoo tshaj plaws hauv cov xwm txheej uas cov ntaub ntawv xav tau los tswj lawv cov duab thiab kev ncaj ncees hauv kev thauj khoom.
Fracture Toughness
Thaum alumina feem ntau yog cov khoom siv tawv tawv, nws muaj qhov tsim nyog tawg toughness, qhia txog qee theem ntawm kev tiv thaiv kom tawg tawm. Cov kws tsim khoom thiab cov kws tshawb fawb txog cov khoom siv feem ntau xav txog kev puas ntsoog toughness thaum tsim cov khoom kom ntseeg tau zoo dua thiab kav ntev.
2. Cov khoom cua sov
Siab Melting Point
Ib qho ntawm cov khoom siv thermal zoo ntawm aluminium oxide yog nws qhov siab melting point, tshaj 2, 000 degrees Celsius (3,632 degrees Fahrenheit). Cov yam ntxwv no ua rau nws yog cov khoom siv zoo tshaj plaws rau cov ntawv thov uas muaj qhov kub thiab txias ib puag ncig, xws li kev tsim cov khoom siv refractory siv nyob rau hauv kilns thiab furnaces.
Tsawg Thermal Expansion
Al2O3 nthuav tawm qhov coefficient qis ntawm thermal expansion, txhais tau tias nws nthuav thiab cog lus tsawg dua nrog kev hloov pauv hauv qhov kub thiab txias. Cov cuab yeej no yog qhov tseem ceeb hauv cov ntawv thov uas qhov kev ruaj ntseg yog qhov tseem ceeb, tiv thaiv cov teeb meem xws li warping lossis deformation vim thermal cycling.
High Thermal conductivity
Txawm hais tias tsis yog qhov siab tshaj plaws ntawm cov ceramics, aluminium oxide muaj cov thermal conductivity zoo. Cov cuab yeej no yog qhov tseem ceeb hauv cov ntawv thov uas ua kom muaj cua sov zoo yog qhov tseem ceeb, xws li hauv qee yam khoom siv hluav taws xob thiab cov thermal insulators.
3. Cov khoom siv hluav taws xob
Hluav taws xob rwb thaiv tsev
Alumina yog ib qho zoo heev hluav taws xob insulator, tiv thaiv kev khiav ntawm hluav taws xob tam sim no. Cov cuab yeej no ua rau nws muaj txiaj ntsig zoo hauv kev siv hluav taws xob, qhov kev rwb thaiv tsev yog qhov tseem ceeb rau kev ua haujlwm kom zoo thiab kev nyab xeeb ntawm cov khoom siv hluav taws xob.
4. Cov khoom siv tshuaj
Tshuaj Inertness
Al2O3 yog chemically inert, ua kom pom kev tiv thaiv rau ntau yam tshuaj. Qhov xwm txheej tsis zoo no ua rau nws tsim nyog rau kev siv hauv ib puag ncig corrosive, qhov twg cov ntaub ntawv xav tau los tiv thaiv cov acids, bases, thiab lwm yam corrosive.
5. Optical Properties
Pob tshab
Hauv nws daim ntawv pob tshab, aluminium oxide yog siv rau hauv qee qhov kev siv kho qhov muag. Transparent alumina nthuav tawm qhov pom kev pom zoo, ua rau nws tsim nyog rau cov qhov rais hauv cov cuab yeej thiab cov cuab yeej siv qhov pom kev thiab lub teeb kis tau tus mob yog qhov tseem ceeb.
Lwm yam khoom
Biocompatibility
Alumina yog biocompatible, txhais tau hais tias nws tau txais txiaj ntsig zoo los ntawm cov ntaub so ntswg nyob. Cov cuab yeej no ua rau nws tsim nyog siv rau hauv kev kho mob cog thiab prosthetics, qhov twg cov ntaub ntawv yuav tsum muaj kev cuam tshuam zoo rau tib neeg lub cev.
Hauv kev xaus, aluminium oxide (Al2O3) sawv tawm raws li cov khoom siv ceramic nrog kev sib xyaw zoo kawg nkaus ntawm kev siv tshuab, thermal, hluav taws xob, thiab cov khoom siv kho qhov muag, ua rau nws xaiv rau ntau hom kev lag luam, txawm tias nyob rau hauv kev lag luam chaw, khoom siv hluav taws xob, kev cog lus kho mob, lossis cov cuab yeej kho qhov muag.
