Andalusite (Al2O3 · SiO2) yog lub ntuj ntxhia nrog cov thermal conductivity, lub ntim ruaj khov, lub zog ntawm lub zog loj, zoo heev nkag tsis kam thiab CO yaig tsis kam. Nws tuaj yeem siv ncaj qha los ua cov ntaub ntawv refractory tsis muaj calcination. Nws yog siv hauv metallurgy thiab lub tsev cov ntaub ntawv kev lag luam. Piv nrog siab alumina refractory raw cov ntaub ntawv xws li scorch gemstone, siab alumina bauxite, sintered mullite thiab xim av corundum, andalusite hloov mus rau hauv cov qauv sib txawv ntawm qhov kub: qhov zoo li mullite nrog poillary pores thiab puv Silica-nplua nuj iav theem. Nws muaj zoo heev slag tsis kam thiab thermal poob siab ua hauj. Cov kev tshawb fawb pom tias mullite cov tshuaj tiv thaiv ntawm andalusite raug cuam tshuam los ntawm lwm yam xws li tshuaj lom neeg muaj pes tsawg leeg, qhov kub thiab qhov loj me, uas loj txiav txim siab qhov ua tiav ntawm andalusite cov khoom lag luam. Tsab xov xwm no piav qhia txog qhov muaj pes tsawg leeg thiab qauv ntawm andalusite, cov kev hloov pauv hloov thaum lub sijhawm cua sov, thiab kev siv raug.
Kev Sau thiab txheej txheem ntawm andalusite
Andalusite feem ntau yog columnar muaju nrog ib tus ntoo khaub lig ze ze rau ib lub xwmfab. Cov ntsiab lus ntawm andalusite theem yog feem ntau 90% txog 95%, thiab cov cheebtsam tsis huv raug teem rau hauv cov khoom siv lead ua kom pom tseeb thiab zoo li tus qauv ntawm tus ntoo khaub lig. Nws yog hu ua hollow spar, feem ntau yog carbonaceous, hlau oxide, mica (sericite thiab dub Mica), ilmenite thiab quartz, qee qhov tsis muaj zog kuj pom nyob rau hauv cov siv lead ua ntxaij ntawm andalusite. Thoob Ntiaj Teb, andalusite yog cov nplua nuj hauv kev tseg, cov chaw ua khoom tseem ceeb yog South Africa thiab Fabkis, thiab cov ntsiab lus feem ntau yog 8% txog 25% (w). Qhov me me qhov loj me ntawm kev lag luam muaj nyob hauv andalusite yog li ntawm 2μm txog 8mm, thiab cov ntsiab lus ntawm Al2O3 yog nruab nrab ntawm 55% thiab 61% (w).
Cov qauv siv lead ua ntawm andalusite belongs rau cov txheej txheem orthorhombic, a = 0.778nm, b = 0.792nm, c = 0.557nm, z = 4. Al-O octahedrons txuas nrog rau kev sib txig sib luag thiab tau txuas rau hauv cov saw hlau raws tus c-axis kev coj. Cov saw hlau txuas nrog Al thiab Si-O tetrahedra nrog tus xov tooj ntawm kev sib koom tes ntawm 5. Tus anion muaj ob qho kev sib koom ua ke: ib qho yog koom nrog Si-O tetrahedron, uas txuas nrog 1 Si thiab 2 Al; lwm qhov yog tsis koom nrog Si-O tetrahedron, thiab tsuas yog sib txuas nrog 3 Al. Andalusite muaju yog rhombohedral txhua, uas yog xwm yeem nrog cov kev taw qhia ntxiv ntawm Al-O octahedral saw. Al3+ hauv Al-O octahedron hloov los ntawm Fe3+ thiab hloov xim liab, thiab nws tau hloov los ntawm Mn3+ thiab hloov ntsuab.
2. Cua sov hloov ntawm andalusite
Andalusite muaj kev pom tseeb anisotropy. M.Ghassemi li al. coj mus kuaj raws cov lus qhia sib txawv ntawm andalusite (saib Daim Duab 1), thiab ntsuas thiab piv nws cov cwj pwm nthuav dav qis dua 900 ° C. Lub sijhawm no, tus qauv tsis yauv hloov ib theem thiab tseem nyob rau hauv andalusite theem. Cov txiaj ntsig yog raws li hauv daim duab 2 qhia tau hais tias: lub thermal expansion coefficient nyob rau hauv a-axis kev coj yog qhov loj tshaj plaws, thiab cov thermal nthuav nyob rau hauv c-axis kev coj yog qhov tsawg tshaj plaws.
