Cov Pob Zeb Alumina Uas Tiv Thaiv Tau Kev Hnav: Tsim Los Rau Kev Tiv Thaiv Kev Sib Txhuam Zoo Kawg Nkaus

Cov khoom siv alumina ceramic uas tiv taus kev hnavyog tsim los ntawm kev ua kom huv siab los ntawm cov txhuas oxide uas muaj cov khoom siv siab (Al₂O₃ cov ntsiab lus ≥ 92–99%) los ntawm kev nias qhuav thiab sintering kub siab ntawm 1,500–1,700 ° C. Cov txheej txheem tsim khoom siab heev no ua rau cov khoom siv ceramic nrog qhov nyuaj tshwj xeeb - ntsuas 9 ntawm Mohs nplai thiab HRA 80–90 ntawm Rockwell nplai, thib ob tsuas yog pob zeb diamond. Nrog rau qhov ntim ntim ntawm 3.60–3.85 g / cm³, cov blocks no hnyav kwv yees li ib nrab ntawm cov hlau, txo cov khoom siv thauj khoom thaum xa cov kev tiv thaiv kev hnav zoo dua. Cov khoom siv qhia txog kev nqus dej qis qis dua 0.01%, ua kom muaj kev ua haujlwm ruaj khov txawm tias nyob rau hauv ib puag ncig uas muaj dej noo.

Qhov kev tiv thaiv kev hnav zoo dua ntawm alumina ceramic blocks txhais tau tias ncaj qha mus rau lub neej ntev ntawm cov khoom siv thiab txo cov nqi txij nkawm. Kev sim ywj pheej qhia tau tias lawv qhov kev tiv thaiv kev hnav yog kwv yees li 260–266 npaug ntawm manganese hlau thiab 170–171.5 npaug ntawm cov hlau cam khwb cia siab chromium. Nrog lub zog compressive ncav cuag ≥2,000 MPa thiab lub zog flexural ntawm 255–300 MPa, cov blocks no tiv taus cov khoom hnyav yam tsis muaj kev tawg. Lawv qhov kev tawg toughness (KIC) ntawm ≥4.8 MPa·m¹/² ntxiv kom ntseeg tau tias muaj kev ruaj khov nyob rau hauv cov xwm txheej kev ntxhov siab cyclic. Cov yam ntxwv kev ua tau zoo no ua rau alumina ceramic blocks yog qhov kev daws teeb meem zoo tshaj plaws rau cov ntawv thov hnav siab xws li chutes, hoppers, cyclones, thiab cov txheej txheem tuav khoom.

Txij li kev khawb av thiab kev ua cov khoom siv hauv av mus rau kev tsim cov cement, kev tsim hlau, kev tsim hluav taws xob thermal, thiab kev ua cov tshuaj lom neeg, cov alumina ceramic blocks uas tsis yooj yim hnav tau ua pov thawj lawv qhov txiaj ntsig thoob plaws hauv kev lag luam uas qhov kev puas tsuaj ntawm cov khoom siv yog qhov txhawj xeeb tseem ceeb. Muaj nyob rau hauv Al₂O₃ qib purity ntawm 92%, 95%, thiab 99%, cov blocks no tuaj yeem hloov kho kom tau raws li cov kev xav tau tshwj xeeb, nrog rau kev huv siab dua uas ua rau muaj kev tiv thaiv kev hnav thiab kev xeb zoo dua. Los ntawm kev koom ua ke alumina ceramic blocks rau hauv cov cheeb tsam hnav tseem ceeb, cov neeg ua haujlwm hauv cov nroj tsuag tuaj yeem txo qhov tsis tau npaj tseg, txo cov khoom seem hloov pauv, thiab ua tiav tus nqi tag nrho ntawm kev muaj tswv cuab thoob plaws lub neej ntawm cov khoom siv.