Tabular aluminayog ib tug ntom, tag nrho shrunk, sintered -Al2O3aggregate qauv muaj xws li 50-400μm nplej. Tabular corundum yog lub npe rau nws cov phaj zoo li cov nplej. Tabular alumina yog npaj los ntawm calcination ceev ntawm ultrafine -Al2O3pellets ntawm me ntsis hauv qab lub melting kub. Tom qab kev kho cua sov, cov 18-20 hli pellets raug crushed los yog hauv av kom tau cov kab corundum ntawm ntau qhov ntau thiab tsawg.
Rau cov khoom kub zoo heev, qib qis ntawm silicon oxide, hlau oxide thiab titanium oxide hauv corundum yog qhov tseem ceeb heev. Cov ntsiab lus ultra-low ntawm soluble hlau feem ntau tsawg dua 0.002% rau phosphate bonded refractories. Thaum muab piv sintered tabular alumina nrog rau lwm cov hluavtaws siab alumina aggregates, xws li fused dawb corundum, qhov sib txawv loj tshaj yog cov ntsiab lus impurity nrog finer loj. Qhov no tuaj yeem ua rau muaj kev sib txawv loj, tshwj xeeb tshaj yog kev ua haujlwm kub. Cov ntsiab lus impurity siab dua qhia hauv qhov loj me zoo heev txo qhov kub ntim ruaj khov thiab nkag siab tsis kam. Qhov sib txawv loj tuaj yeem pom thaum muab piv cov porosity ntawm fused dawb corundum thiab tabular corundum. Txawm hais tias tag nrho cov porosity ntawm ob qhov sib xyaw ua ke yog tib yam, muaj qhov sib txawv tseem ceeb hauv cov nplej pores.
Qhov qhib porosity ntawm cov nplej fused yog 2-3 npaug ntawm cov nplej sintered. Feem ntau ntawm cov pores ntawm fused alumina yog tsim los ntawm loj qhib pores, thaum ntau tshaj ib nrab ntawm cov pores ntawm tabular alumina yog kaw pores. Qhov feem ntau ntawm cov pores kaw yog tsim nyog rau siab thermal poob siab tsis kam, uas yog ib qho tseem ceeb feature ntawm tabular corundum.
Tabular alumina nthuav tawm cov thermal shock tsis kam thiab siab zog. Scanning electron micrographs qhia tau hais tias saum npoo ntawm tabular corundum nplej tsis zoo li cov fused alumina nplej, tab sis yog rougher nrog ntiav hemispherical pores. Cov qauv saum npoo no txhawb nqa nws cov tshuaj tiv thaiv thiab kev sib txuam nrog cov matrix, yog li txhim kho lub zog ntawm refractory.
Cov khoom tseem ceeb ntawm tabular alumina yog raws li nram no:
1. High-purity Al2O3concentration ntawm 99.4%;
2. Siab hardness ntawm cov siv lead ua;
3. Tsawg qhib porosity thiab 2-3 zaus dua kaw porosity;
4. High particle packing ceev ntawm 3.55-3.6g/cm3;
5. High melting point: 2000 degree;
6. Tshuaj inertness;
7. Zoo thermal poob siab tsis kam;
8. Zoo heev ntim stability;
9. Lub xub ntiag ntawm microcracks;
10. High ib leeg grain lub zog.