Aluminium carbide

Aluminium carbide yog ib qho kev ua qauv hauv binary binary uas muaj txhuas. Nws cov mis nyuj tov yog sau raws li Al4C3, nws zoo li daj ntseg daj los yog xim av siv daj uas muaj txoj hauv kev tawv ntoo. Nws muaj peev xwm tiv taus kub sawv ntsug txog 1400 ° C ntawm qhov kub ntawm 2.36 g / cm³. Raws li ib feem ntawm nws cov lattice, carbon atoms yog tam sim no raws li discrete carbon anions. Qhov no compound yog npaj los ntawm lub direct cov tshuaj tiv thaiv ntawm cov pa roj carbon nrog txhuas nyob rau hauv lub arc cub tawg, nws kuj yog ib tug me npaum li cas ntawm impurities tam sim no nyob rau hauv lub poov hlau carbide kev keeb kwm.

Carbide txhuas: Yam ntxwv thiab daim ntawv thov

Electrolytic aluminium ntau lawm implies tus cais ntawm no compound li corrosive khoom hauv graphite electrodes. Nyob rau hauv rooj plaub twg txhuas qhov carbide reacts nrog dej los yog ib qho dilute acid, methane yog tsim. Tsis tas li ntawd, cov tshooj tshuaj reacts nrog oxygen thiab hydrogen, thiab thaum muaj cov dej tshuaj thiab cov tshuaj sodium hydroxide concentrate, ib txoj kab ntsev tsim ua hu ua tetrahydroxoaluminate ntawm methane thiab sodium. Lawm, lub compound muaj ib lub zog, nws yog hais txog lub refractive indices muaj feem xyuam rau cov sodium D-line, thiab nce mus txog 20 ° C. Nyob rau tib lub sij hawm coj mus rau hauv tus account lub txheem Gibbs zog thiab txheem entropy ntawm tsim, cov ntsuas 196 thiab mus txog 88,95Dzh / mol / K. Kev npaj ntawm cov dej no yog ua tau raws li ib yam khoom tsis raug cai hauv kev tshuaj lom neeg txoj sia.

Hauv particular, cov hlau matrix txuas raws li ib qho txhuas cov zauv thiab muaj zog nrog cov xim hlau carbides, xws li boron carbide thiab silicon carbide, tuaj yeem ua rau kom muaj tshwm ntawm aluminium carbide ua ib qho uas tsis muaj leej twg ua. Ib qho teeb meem zoo li no yog ua tau rau hauv cov roj carbonaceous, uas yog raws li cov tshuaj tiv thaiv nrog ib qho txhauv hauv qhov kub thiab txias tshaj li ntawm 50 ° C kuj tau tso rau hauv cov lus nug. Thaum lub sij hawm cov zaj ntawm cov tshuaj cov tshuaj tiv thaiv ntawm txhuas thiab cam khwb cia pob zeb ntais carbide txheej tej zaum yuav ua tau ib tug carbide ntawm txhuas, nws yuav them rau cov pob zeb ntais carbide particle thiab txo cov ntaub ntawv uas lub zog.

Txawm li cas los xij, cov nyhuv no tuaj yeem txo los ntawm cov txheej txheem silicon nrog cov oxide uas haum los yog ua ntej oxidizing lawv tsim ib lub tsho loj. Tshawb xyuas seb qhov tritium ntau npaum li cas hauv cov dej, qhov compound yog hydrolyzed, ua rau aluminium carbide methane. Hauv qhov no, lub compound siv los ua tshuaj lom neeg tshuaj, ib tritium thiab methane compound yog ua los ntawm cov tshuaj tiv thaiv nrog tshem tawm dej. Aluminium carbide, ua li khiav los ntawm ib qho txhuas hauv daim duab, pab tswj kom ceev cov khoom, tshwj xeeb tshaj yog hais tias nws muaj kev sib xyaw nrog cov xim silicon carbide.

Composite ntaub ntawv ntawm txhuas carbide yuav tau los ntawm cov neeg kho tshuab alloys raws li txhuas hmoov thiab graphite hais. Ua ke nrog qhov no, lub compound siv los ua ib qho kev txiav rau cov cuab yeej high-speed, uas yog muab lawv cov hardness ntawm topaz. Lwm qhov chaw ntawm daim ntawv thov ntawm lub compound yog pyrotechnics, ntawm no nws tso cai rau koj tau txais ib tug firefly siv, uas yog qhia nyob rau hauv lub tshaj plaws tsos ntawm sparks. Nco ntsoov tias nyob rau ntau lub sijhawm hauv pyrotechnics, nws yeej ib txwm siv nrog qhov sib xws siv. Nyob rau hauv dav dav, no compound yog dav siv nyob rau hauv lub tshuaj ua lag luam thiab kev tsim. Qhov no yog vim muaj cov yeeb yam tshuaj lom neeg ntawm cov txhuas muaj hlau, muab nws cov khoom tshwj xeeb, tsis yog yam ntxwv ntawm lwm hom kev sib txuas ntawm pawg carbide.