Andalusite yog cov kob zoo li cov dej tsis muaj dej silicate, ib qho ntawm cov zaub mov ntawm pawg andalusite. Cov pab pawg neeg ntawm cov zaub mov no muaj tib cov tshuaj muaj pes tsawg leeg Al2SiO5, tab sis muaj cov qauv siv lead ua sib txawv, yog li lub cev muaj zog sib txawv me ntsis. Kev hais lus theoretical, pawg ntawm cov zaub mov no muaj 362.9 feem pua Al2O. Yog li, pawg ntawm cov zaub mov no yog nruab nrab ntawm kaolin refractories muaj 337 feem pua Al2O thiab bauxite refractories muaj 380 ~ 90 feem pua Al2O. Nws belongs rau aluminosilicic acid nrog nruab nrab aluminium ntsiab lus. Ntau yam ntawm ntsev refractories. Al hauv andalusite tuaj yeem hloov tau los ntawm Fe3 ntxiv ( Tsawg dua lossis sib npaug li 9.6 feem pua ) thiab Mn ( Tsawg dua lossis sib npaug li 7.7 feem pua ).
Andalusite feem ntau yog cov ntxhia ntawm metamorphic keeb kwm. Nyob rau hauv cheeb tsam metamorphism, nws yog tsim nyob rau hauv cov kev mob uas tsis tshua muaj metamorphic kub thiab siab, feem ntau pom nyob rau hauv txhuas-nplua nuj argillaceous schist; feem ntau nrog cordierite, quartz, muscovite, garnet, staurolite, biotite thiab lwm yam nplua nuj Cov ntxhia symbiosis ntawm txhuas. Nws kuj tseem pom nyob rau hauv thaj chaw sib cuag ntawm cov pob zeb argillaceous thiab cov pob zeb intrusive, thiab yog ib qho kev sib cuag thermal metamorphic ntxhia.
Txheej txheem yam ntxwv ntawm andalusite
Kev siv ntawm nws yog tsuas yog raws li nws qhov kub thiab txias kuj yam ntxwv. Tom qab nws tau rhuab mus rau 1350 degree nyob rau hauv ib txwm siab, nws pib hloov mus rau hauv acicular mullite thaum uas tig mus rau thawj siv lead ua. Mullite lub cev yog tib daim ntawv ruaj khov ntawm aluminosilicate nyob rau hauv qhov kev txiav txim ntawm qhov kub thiab txias, thiab nws qhov kev hloov pauv theoretical yog 87.64 feem pua.
Nyob rau hauv cov txheej txheem ntawm cua sov thiab hloov mus rau mullite, andalusite tuaj yeem tsim ib qho zoo mullite network nrog lub ntim nthuav dav li ntawm 4 feem pua. Qhov no yog ib qho irreversible crystal transformation. Thaum hloov pauv, nws muaj kev tiv thaiv hluav taws ntau dua. Lub refractoriness tuaj yeem ncav cuag siab tshaj 1800 degree, thiab nws tiv taus txias txias thiab kub, muaj zog txhua yam, muaj zog thermal poob siab, thiab muaj zog slag kuj. Lub load hloov dua siab tshiab taw tes yog siab, thiab nws muaj tshuaj lom neeg ruaj khov heev (txawm tias insoluble hauv hydrofluoric acid) thiab muaj zog tshuaj tiv thaiv.
Kev siv ntawm andalusite
Nws tuaj yeem siv los tsim cov khoom siv refractory siab heev. Nws yog ib qho ntawm cov tam sim no paub cov ntaub ntawv zoo refractory. Nws tseem tuaj yeem siv los ua cov khoom siv raw rau radomes. Nws tuaj yeem siv rau hauv kev lag luam ceramic los ua kom cov neeg kho tshuab muaj zog thiab ua kom kub ceev ntawm cov khoom. Nws tuaj yeem smelted nrog siab zog thiab lightness. High-zoo silicon-aluminium alloy, siv rau zus tau tej cov hlau fibers thiab cov kev taw qhia ntawm supersonic aircraft thiab spacecraft. Lub pob zeb uas tsim cov pob zeb chrysanthemum tuaj yeem siv los ua cov pob zeb zoo nkauj. Zoo xim thiab pob tshab, coarse siv lead ua nplej tuaj yeem siv los ua cov khoom siv pob zeb diamond. Hollow spar tuaj yeem siv los ua pob zeb zoo nkauj. Nws thaj chaw thov tseem tab tom nthuav dav.
