Kev Muag Khoom Ntawm HUAO's Tabular Alumina Mus Ntxiv

Tabular Alumina yog ntom, shrinking, sintered -al2o3 nrog 50-400μm nplej ua aggregate qauv. Tabular corundum tau txais nws lub npe vim nws cov nplej zoo li daim hlau. Phaj-zoo li corundum tau npaj los ntawm calcination ceev ntawm ultrafine -al2o3 pellet ntawm me ntsis melting kub. Tom qab kev kho cua sov, lub pob 18-20 hli yog crushed los yog hauv av kom tau ntau qhov ntau thiab tsawg ntawm phaj corundum.

Cov ntsiab lus qis ntawm silicon oxide, hlau oxide thiab titanium oxide hauv corundum yog qhov tseem ceeb heev rau kev ua haujlwm kub zoo. Cov ntsiab lus ultra-low ntawm soluble ferric acid feem ntau tsawg dua 0.002 feem pua, uas yog ib qho tseem ceeb heev rau phosphate bonded refractories.

Qhov sib txawv ntawm sintered phaj corundum thiab lwm yam hluavtaws siab alumina aggregates, xws li fused dawb corundum, pom tias yog cov ntsiab lus impurity ntawm ib tug finer loj. Qhov no tuaj yeem ua rau muaj kev sib txawv loj heev, tshwj xeeb tshaj yog thaum kub kub. Cov ntsiab lus impurity siab dua thiab qhov loj me me yuav txo tau qhov ruaj khov thiab nkag siab ntawm qhov kub thiab txias.

Piv rau dawb fused corundum thiab tabular corundum porosity  tuaj yeem pom qhov sib txawv loj. Txawm hais tias tag nrho cov porosity ntawm ob qhov sib xyaw ua ke yog tib yam, cov nplej porosity sib txawv heev.

Lub porosity ntawm electromelted nplej yog 2-3 npaug ntawm sintered nplej. Feem ntau ntawm cov pores nyob rau hauv fused alumina yog tsim los ntawm loj qhib pores, thaum ntau tshaj ib nrab ntawm cov pores nyob rau hauv phaj corundum yog kaw pores. Qhov feem ntau ntawm kaw qhov pores rau siab thermal shock kuj yog ib yam ntawm cov phaj corundum.

Phaj-shaped corundum nthuav tawm cov thermal poob siab thiab siab zog. Kev soj ntsuam electron microscopy tau pom tias qhov saum npoo ntawm cov phaj corundum nplej tsis zoo li cov fused corundum nplej, tab sis ntxhib nrog ntiav hemispherical pores. Cov qauv saum npoo no txhawb nqa nws cov tshuaj tiv thaiv nrog lub substrate thiab mechanical interlocking li no txhim kho lub zog ntawm refractory.