3303,441,553 silicon hlau additive rau aluminium alloy casting

Industrially, hlau silicon feem ntau yog tsim los ntawm kev txo silica nrog cov pa roj carbon nyob rau hauv lub cub hluav taws xob.

Kev sib npaug tshuaj tiv thaiv: SiO2 + 2C→Si + 2CO

Lub purity ntawm silicon tau nyob rau hauv no txoj kev yog 97 ~ 98%, uas yog hu ua hlau silicon.Tom qab ntawd nws yog melted thiab recrystallized, thiab impurities raug tshem tawm nrog cov kua qaub kom tau nws cov hlau silicon nrog purity ntawm 99.7 ~ 99.8%.

Qhov 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 ibgrey-dub hmoovuas yog qhov tseeb microcrystal.

Crystalline silicon muajsiv lead ua qauvthiabsemiconductor khoom ntawm pob zeb diamond, covmelting point yog 1410 ° C, lub boiling point yog 2355 ° C, lub Moh lub hardness hardness yog 7, thiab nws yog nkig.Amorphous silicon yog tshuaj lom neeg thiab ua taukub hnyiab hauv oxygen.Nws reacts nrog cov hlau tsis muaj hlau xws li halogen, nitrogen thiab carbon ntawm qhov kub thiab txias, thiab tuaj yeem cuam tshuam nrog cov hlau xws li magnesium, calcium thiab hlau los tsim silicides.Amorphous silicon yuav luag insoluble nyob rau hauv tag nrho cov inorganic thiab organic acids nrog rau hydrofluoric acid, tab sis yog soluble nyob rau hauv sib xyaw acids ntawm nitric acid thiab hydrofluoric acid.Concentrated sodium hydroxide tov tuaj yeem yaj amorphous silicon thiab tso tawm hydrogen.Crystalline silicon yog qhov tsis ua haujlwm, nws tsis ua ke nrog oxygen txawm tias nyob rau hauv qhov kub thiab txias, nws yog insoluble nyob rau hauv tej inorganic acid thiab organic acid, tab sis nws yog soluble nyob rau hauv sib xyaw acids ntawm nitric acid thiab hydrofluoric acid thiab concentrated sodium hydroxide tov.

Ib tug loj npaum li cas ntawm silicon yog siv rau smelting rau hauv ferrosilicon alloy raws li ib tug alloying caij nyob rau hauv cov hlau thiab steel kev lag luam, thiab raws li ib tug txo tus neeg sawv cev nyob rau hauv lub smelting ntawm ntau yam hlau.Silicon kuj yog ib qho zoo tivthaiv hauv txhuas alloys, thiab feem ntau cam khwb cia txhuas alloys muaj silicon