Taw qhia:
Tabular aluminatau siv dav hauv kev ua haujlwm siab refractories rau steel, foundry, petrochemical thiab ceramics rau 40 xyoo. Tabular alumina yog cov tseem ceeb hluavtaws high-purity alumina aggregate vim nws siab refractoriness, zoo heev thermal shock tsis kam, creep kuj thiab hnav tsis kam. Txawm hais tias tag nrho cov khoom siv refractory tau poob qis, tshwj xeeb tshaj yog nyob rau hauv daim ntawv thov ntawm steel manufacturing, kev siv cov tabular alumina tsis tau tsuas yog nce kuj, tab sis nce kiag li. Qhov nce tsis tu ncua ntawm qhov kev faib ua feem ntawm monolithic refractories qhia nyob rau hauv nruam nruam casting thiab kev ua phem ntawm cov hlau zoo yog cov tsav tsheb rau kev txhim kho tabular alumina-raws li refractories.
Kev ua tau zoo:
Tabular corundum yog tuab, tag nrho shrunk, sintered -Al2O3 aggregate qauv muaj li ntawm 50-400 μm nplej. Tabular corundum tau txais nws lub npe los ntawm cov duab ntawm nws cov nplej zoo li slabs. Tabular alumina tau npaj los ntawm calcining ceev ceev ultrafine -Al2O3pellets ntawm qhov kub me ntsis qis dua qhov kub melting. Tom qab kev kho cua sov, zuaj lossis zom 18-20 hli pellets kom tau cov kab corundum ntawm ntau qhov ntau thiab tsawg.
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. Ultra-tsawg theem ntawm yaj hlau oxides, feem ntau tsawg dua 0.002 feem pua, yog ib qho tseem ceeb heev rau phosphate-bonded refractories. Sib piv sintered tabular alumina nrog rau lwm cov hluavtaws high-alumina aggregates, xws li fused dawb corundum, qhov sib txawv loj tshaj plaws yog pom tias muaj cov ntsiab lus tsis zoo. Qhov no tuaj yeem ua rau muaj kev sib txawv loj, tshwj xeeb tshaj yog kev ua haujlwm kub. Kev taw qhia txog cov ntsiab lus impurity siab dua hauv qhov loj me zoo heev txo qhov kub ntawm qhov ruaj khov thiab nkag mus. Muab piv cov porosity ntawm fused dawb corundum thiab tabular corundum, qhov sib txawv loj tuaj yeem pom. Txawm hais tias tag nrho cov porosity ntawm ob qhov sib xyaw ua ke yog tib yam, cov nplej porosity sib txawv heev.
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Qhov qhib porosity ntawm fused nplej yog 2-3 npaug ntawm sintered nplej. Feem ntau ntawm cov pores ntawm fused alumina yog tsim los ntawm loj qhib pores, thaum ntau tshaj li ib nrab ntawm cov pores ntawm tabular corundum yog kaw pores. Qhov feem ntau ntawm cov pores kaw yog tsim nyog rau siab thermal shock tsis kam, uas yog ib txwm ntawm tabular alumina.
Tabular alumina nthuav tawm cov thermal shock tsis kam thiab siab zog. Scanning electron microscope duab qhia tau hais tias qhov saum npoo ntawm tabular 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 thiab kev sib txuam nrog cov matrix kom muaj zog ntawm refractory.
Cov khoom tseem ceeb ntawm tabular corundum yog raws li hauv qab no:
1. High-purity Al2O3 concentration ntawm 99.4 feem pua;
2. High crystal hardness;
3. Tsawg qhib porosity thiab 2-3 zaus dua kaw porosity;
4. High particle packing ceev 3.55-3.6g/cm3;
5, siab melting point: 2000 degree;
6, tshuaj inertness;
7, zoo thermal shock kuj;
8, zoo heev ntim stability;
9, muaj microcracks;
10, siab ib grain zog.
Lub ntsiab daim ntawv thov teb ntawm tabular alumina:
Cov khoom ntawm tabular alumina muaj ntau daim ntawv thov hauv thaj chaw ntawm refractories. Lub ntsiab teb ntawm daim ntawv thov ntawm tabular alumina, tabular alumina yog haum rau ceramic, tshuaj thiab dej-bound matrices. Tabular alumina tuaj yeem siv ib leeg thiab hauv kev sib xyaw ua ke lossis nrog calcined thiab / lossis qhib alumina. Vim tias tabular corundum nthuav tawm cov purity siab heev txawm tias yog cov hmoov zoo, nws tuaj yeem siv los txhim kho cov khoom ntawm qis alumina aggregates. Piv txwv li, bauxite thiab fused xim av corundum, coarse hais ntawm cov aggregates thiab nruab nrab thiab zoo hmoov ntawm tabular corundum yog siv. Nws twb tau hais tias qhov nce hauv kev noj ntawm tabular alumina feem ntau yog los ntawm kev nruam nruam ntawm cov hlau. Tshwj xeeb tshaj yog rau skids, dip raj thiab nozzles, kev siv tabular alumina yog kev lag luam tus qauv yuav tsum tau muaj.
