Tabular aluminatau siv los ua refractory aggregate txij thaum nruab nrab -1950s. Thaum lub sij hawm ntawd, high-purity calcium aluminate cement thiab phosphate binders tau tsim. Daim ntawv thov ntawm cov binders no tau txhim kho kev yaig tsis kam ntawm tabular alumina refractories. thiab abrasion tsis kam.
Cov khoom ntawm Tabular Alumina
Tsis zoo li cov sintered corundum zoo tib yam uas raug rho tawm haujlwm hauv lub qhov cub tawg lossis qhov, tabular corundum raug rho tawm haujlwm sai ntawm qhov kub siab tshaj 1900 degree thiab tom qab ntawd crystallized -Al2O3. Tsis zoo li qub corundum, accelerators xws li MgO thiab CaO ntxiv. Nws tsis muaj cov additives, yog li tabular alumina muaj cov yam ntxwv hauv qab no.
① Cov muaj pes tsawg leeg yog tsim tau zoo -Al2O3siv lead ua;
② Cov muaju ntawm -Al2O3yog ntxhib, qhov nruab nrab txoj kab uas hla yog 40-200μm, thiab ob-dimensional morphology ntawm cov muaju yog tiaj thiab interspersed nrog ib leeg;
③ Hauv-Al2O3siv lead ua, peb tuaj yeem pom ntau puag ncig kaw qhov pores ntawm 5-15μm, thiab cov ntsiab lus ntawm qhib qhov pores tsuas yog 2 feem pua -3 feem pua, uas yog me me;
④ Muaj -Al2O3nyob rau hauv lub grain ciam teb ntawm -Al2O3siv lead ua.
Vim yog cov yam ntxwv saum toj no ntawm tabular alumina, nws kuj muaj cov khoom hauv qab no:
① Muaj lub siab melting point txog 2040 degree;
② Muaj cov tawv tawv loj, Mohs hardness 9, Knoop hardness (Knoop) 2000;
③ Ntxiv nrog rau hydrofluoric acid thiab phosphoric acid, tabular alumina tsis ua haujlwm nrog feem ntau alkalis thiab ntxhia acids, thiab muaj tshuaj tiv thaiv corrosion zoo;
④ Nws muaj lub zog muaj zog, vim nws tsis muaj microcracks thiab loj hauv qhov hws; nws muaj qhov zoo thermal shock stability, thiab nws lub zog yuav tsis poob ntau thaum nws raug thermal shock;
⑤ High thermal conductivity thiab resistivity, zoo hluav taws xob ua haujlwm nyob rau hauv siab zaus thiab kub.
