3303,441,553 silicon hlau additive rau txhuas alloy casting
Hauv kev lag luam, cov xim silicon feem ntau yog tsim los ntawm kev txo cov silica nrog cov pa roj carbon hauv lub cub hluav taws xob.
Cov qauv tshuaj lom neeg: SiO2 + 2C→Si + 2CO
Qhov purity ntawm silicon tau los ntawm txoj kev no yog 97 ~ 98%, uas yog hu ua hlau silicon. Tom qab ntawd nws yog yaj thiab recrystallized, thiab impurities raug tshem tawm nrog acid kom tau txais cov hlau silicon nrog purity ntawm 99.7 ~ 99.8%.
Cov khoom sib xyaw ntawm cov hlau silicon feem ntau yog silicon, yog li nws muaj cov khoom zoo sib xws rau silicon.
Silicon muaj ob lub allotropes:amorphous silicon thiab crystalline silicon.
Amorphous silicon yog ib qhohmoov grey-dubqhov ntawd yog qhov tseeb microcrystal.
Crystalline silicon muaj cov yam ntxwv ntawmcov qauv siv lead uathiabCov yam ntxwv ntawm semiconductor pob zeb diamond, tusQhov kub yaj yog 1410 ° C, lub ntsiab lus kub yog 2355 ° C, Moh qhov nyuaj yog 7, thiab nws yog brittle. Amorphous silicon yog chemically active thiab tuaj yeemhlawv hnyav heev hauv cov pa oxygenNws reacts nrog cov hlau tsis yog hlau xws li halogen, nitrogen thiab carbon ntawm qhov kub siab, thiab kuj tuaj yeem cuam tshuam nrog cov hlau xws li magnesium, calcium thiab hlau los tsim cov silicides. Amorphous silicon yuav luag tsis yaj hauv txhua yam inorganic thiab organic acids suav nrog hydrofluoric acid, tab sis yaj hauv cov kua qaub sib xyaw ntawm nitric acid thiab hydrofluoric acid. Cov kua sodium hydroxide concentrated tuaj yeem yaj amorphous silicon thiab tso hydrogen. Crystalline silicon tsis tshua muaj zog, nws tsis sib xyaw nrog oxygen txawm tias thaum kub siab, nws tsis yaj hauv cov kua inorganic thiab organic acid, tab sis nws yaj hauv cov kua qaub sib xyaw ntawm nitric acid thiab hydrofluoric acid thiab cov kua sodium hydroxide concentrated.
Muaj ntau cov silicon siv rau kev smelting rau hauv ferrosilicon alloy ua ib qho alloying hauv kev lag luam hlau thiab hlau, thiab ua tus neeg sawv cev txo qis hauv kev smelting ntawm ntau hom hlau. Silicon kuj yog ib qho khoom zoo hauv cov hlau txhuas, thiab feem ntau cov hlau txhuas cam khwb cia muaj silicon.
