Cov yam ntxwv thiab kev siv ntau yam ntawm cov khoom siv graphite

Cov ntaub ntawv carbon yog inorganic non-metallic cov ntaub ntawv tsuas yog tsim los ntawm cov ntsiab lus carbon. Cov khoom siv carbon yog tsim los ntawm cov tsis muaj graphitic carbon, thaum cov ntaub ntawv graphite feem ntau yog tsim los ntawm graphitic carbon. Graphite tuaj yeem muab faib ua ntuj graphite thiab dag graphite.
Cov khoom siv graphite feem ntau yog tsim los ntawm polycrystalline graphite. Graphite yog txheej txheej siv lead ua nrog lub dav hlau hexagonal ntawm cov pa roj carbon atoms. Txawm hais tias graphite yog cov khoom siv tsis muaj hlau tsis muaj hlau, nws yog hu ua semi hlau vim nws cov thermal conductivity zoo. Graphite muaj cov thermal conductivity ntau dua li qee cov hlau, thiab tseem muaj qhov sib txawv ntawm thermal expansion coefficient ntau dua li cov hlau thiab cov tshuaj lom neeg muaj zog, uas ua rau nws muaj txiaj ntsig zoo hauv kev siv engineering. Graphite yog chemically inert nyob rau hauv tsis oxidizing media thiab muaj corrosion kuj zoo. Tsuas yog cov kua qaub muaj zog thiab muaj zog oxidizing xov xwm, graphite tsis raug corrosion ntawm lwm cov acids, alkalis thiab ntsev thiab tsis sib xws nrog cov organic tebchaw.
Cov khoom siv graphite kuj yog ib yam khoom siv kub resistant. Graphite yuav tsis yaj ntawm qhov kub thiab txias. Gasification kub yog siab heev, tab sis 3350 18 pib sublimate rau hauv roj nyob rau hauv ib txwm siab. Feem ntau, lub zog ntawm cov ntaub ntawv txo qis ntawm qhov kub thiab txias, thaum lub zog ntawm graphite nce nrog qhov kub thiab txias thaum nws nyob hauv 2500 'C. Thaum nws siab tshaj 2000 degree, nws lub zog yog ob zaug ntawm qhov kub thiab txias. Graphite cov ntaub ntawv kuj muaj cov thermal shock kuj zoo heev, yog li cov ntaub ntawv graphite muaj qhov tshwj xeeb zoo li cov ntaub ntawv kub.
Cov khoom siv graphite tau dhau los ua cov khoom siv tsis tseem ceeb, cov khoom siv kub, cov khoom siv hluav taws xob, cov khoom siv tiv taus thiab cov khoom siv ua haujlwm hauv kev loj hlob ntawm kev lag luam hauv lub teb chaws vim nws qhov kub thiab txias zog, conductive tshav kub hloov, thermal shock kuj, corrosion kuj, lubrication zoo. thiab lwm yam zoo. Tam sim no, cov ntaub ntawv graphite tau siv dav hauv metallurgy, tshuaj lom neeg kev lag luam, hluav taws xob, khoom siv hluav taws xob, tshuab, hluav taws xob nuclear, kev lag luam aerospace thiab lwm yam, thiab tuaj yeem siv los ua electrodes, electrolytic anodes, pwm thiab kub-kub bearings; Nto txheej siv los ua cov khoom siv neutron deceleration thiab roj nuclear hauv nuclear reactor; Hauv thaj chaw aerospace, cov ntaub ntawv graphite tuaj yeem siv rau cov kav hlau txais xov satellite, qhov chaw shuttle casings, foob pob ua ntxaij tshuab hluav taws xob nozzle caj pas thiab lwm yam khoom.