Alumina ceramic uas tsis yooj yim hnavyog ib yam khoom siv ceramic industrial uas muaj cov alumina ntshiab (Al₂O₃). Nws tau dhau los ua cov khoom siv tseem ceeb rau kev daws teeb meem kev hnav hnyav, kev xeb, thiab kub siab vim nws qhov nyuaj tshwj xeeb, kev tiv taus kev hnav, thiab kev ruaj khov tshuaj lom neeg. Piv rau cov khoom siv hlau ib txwm muaj, nws ua rau lub neej ua haujlwm ntev dua thiab txo qhov zaus txij nkawm thiab cov nqi ntawm ntau qhov kev lag luam, ua haujlwm ua qhov kev daws teeb meem tseem ceeb rau kev lag luam xws li lub zog thiab metallurgy mus rau kev tsim khoom siab.
Nws qhov kev ua tau zoo tshaj plaws yog raws li cov ntaub ntawv tseeb ntawm lub cev thiab tshuaj lom neeg. Lub zog Rockwell (HRA) ntawm alumina ceramic tuaj yeem ncav cuag 80-90, nrog rau lub zog compressive tshaj 850 MPa. Kev ntsuam xyuas kev tshaj lij qhia tias nws qhov kev tiv thaiv hnav yog 266 npaug ntawm cov hlau manganese thiab 171.5 npaug ntawm cov hlau cam khwb cia siab chromium. Hais txog kev tiv thaiv kub, nws qhov kub thiab txias mus sij hawm ntev tuaj yeem ncav cuag 300 ° C, thiab nws tuaj yeem tiv taus acid thiab alkali corrosion hauv pH ntau ntawm 3 txog 12. Cov khoom no ua rau nws ua haujlwm ruaj khov hauv qhov cuam tshuam siab, hnav siab, thiab corrosive ib puag ncig, piv txwv li, txuas lub neej kev pabcuam ntawm cov hmoov thee thauj cov kav dej ntau dua 10 npaug.
Kev ua tau zoo ntawm alumina ceramic uas tsis yooj yim hnav tau txiaj ntsig los ntawm kev tswj hwm qhov tseeb ntawm tag nrho cov txheej txheem los ntawm cov khoom siv raw mus rau sintering. Ua ntej, cov hmoov alumina nyoos raug sib tsoo zoo heev, nrog rau qhov loj me ntawm cov khoom me me feem ntau tswj tau hauv qab 1 micron, ua kom muaj kev ntshiab siab thiab kev faib tawm ntawm cov khoom me me. Cov txheej txheem tsim thawj zaug suav nrog kev nias qhuav thiab kev nias isostatic, qhov tom kawg muab cov khoom sib npaug ntau dua rau lub cev ntsuab. Thaum kawg, lub cev ntsuab raug sintered ntawm kwv yees li 1700 ° C, tsim cov qauv microcrystalline ntom ntom, nrog rau cov khoom siv ntom ntom ncav cuag ntau dua 95%. Cov qauv sib xyaw, xws li ntxiv zirconia (ZrO₂), tuaj yeem txhim kho nws qhov kev cuam tshuam thiab kev tawv.
Cov khoom siv no siv dav hauv ntau qhov kev lag luam. Hauv kev lag luam hluav taws xob thiab kev tiv thaiv ib puag ncig, nws siv rau hauv cov kav dej hmoov thee ntawm cov chaw tsim hluav taws xob thermal, thiab hauv cov classifiers thiab cyclone cones ntawm cov chaw tsim cement, ua rau lub neej ua haujlwm ntawm cov khoom siv ntev dua 3 txog 5 zaug. Hauv kev lag luam metallurgy thiab mining, cov ceramic liners ntsia rau hauv cov kav dej txhaj tshuaj thee thiab cov kav dej tshem tawm plua plav zoo tiv taus cov khoom siv abrasive xws li hmoov hlau ore, txo cov nqi txij nkawm txhua xyoo txog li 60%. Ntxiv mus, ultra-high purity (piv txwv li, 99.7%) alumina ceramics kuj siv rau hauv cov teb tsim khoom siab xws li semiconductor wafer polishing.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-19-2025