Dab tsi yog qhov cuam tshuam ntawm aluminium-silicon ratio thiab impurity muaj pes tsawg leeg hauv kev tsim cov electromelt mullite?
Raws li Al? O? -SiO? Binary theem daim duab ntawm lub system, mullite muaj pes tsawg leeg hauv Al? O? 79%, SiO% 21% los yog li ntawd yog qhov tsim nyog, tab sis xav txog qhov muaj qee yam ntawm impurities hauv cov khoom siv raw, lawv yuav raug txo kom sov. O? Thiab SiO? Cov tshuaj tiv thaiv, hloov pauv hauv Al? O? /SiO2 piv, yog li qhov tseeb Al? O? /SiO? Qhov piv yuav qis me ntsis.
Yog TiO? , CaO, MgO, R? O thiab lwm yam impurities, tsuas yog ib qho me me ntawm titanium tuaj yeem nkag mus rau hauv cov kua mullite thiab muaj nyob rau hauv lub khob theem, tus so tsis tuaj yeem txo kom tshem tawm. Yog li ntawd, qhov nce ntawm impurities yuav ua rau kom cov ntsiab lus ntawm vitreous thiab corundum, thiab ua rau mullite tsim ib coarse siv lead ua qauv, uas yuav ua rau kom cov porosity cov ntsiab lus ntawm siv lead ua, txo cov thermal shock stability thiab yaig kuj, thiab nws yuav ua rau tawg.
Zircon ntau yam
Txhawm rau txhawm rau txhim kho cov tshuaj tua kab mob, thermal poob siab tsis kam thiab txo qhov coefficient ntawm kev nthuav dav ntawm mullite, nws tuaj yeem siv hauv Al? O? -SiO? Qhia ZrO rau hauv qhov system? Yuav kom ua tiav lub hom phiaj ntawm kev txhim kho cov qauv ntawm mullite, mullite uas muaj zirconium dioxide yog zirconium mullite. Zircon mullite feem ntau yog npaj los ntawm electromelting.
ZrO? Muaj ob lub luag haujlwm ntawm kev nkag mus rau hauv mullite: 1. Kev tsim cov kua dej khov, ua kom lub lattice thiab ua kom muaj qhov tsis txaus; Nws tuaj yeem txhawb sintering; siv ZrO? Cov theem hloov pauv toughening mechanism txhim kho qhov kub thiab txias zog thaum ZrO? Thaum cov feem ntau yog nyob nruab nrab ntawm 15% thiab 30%, qhov kev nyuaj siab-induced theem transformation yog lub ntsiab toughening txoj kev. ZrO? Thaum tus nqi ntau dua 30%, lub ntsiab toughening txoj kev yog micro-crack.
Zirconium mullite feem ntau yog siv rau hauv hom tshiab ntawm casting steel swb phaj, nruam casting ladle thiab lub qhov ncauj ntev dej thiab qhov tseem ceeb ntawm iav kiln.
