Black corundum mankhwala katundu

Black corundum, wotchedwanso otsika alumina corundum, ali mu ng'anjo arc, ndi bauxite smelting ndipo anapanga mtundu wa α-Al2O3 ndi chitsulo spinel monga waukulu mchere gawo la imvi wakuda kristalo, amene yodziwika ndi otsika Al2O3 okhutira, ndi kuchuluka kwa Fe2O3 (10% kapena kulimba), kukana mkulu kutentha, khalidwe kutentha, kukana kutentha kwambiri. Amagwiritsidwa ntchito popera kwaulere, monga kugaya movutikira pamaso pa zinthu za electroplating, zomwe zimagwiritsidwa ntchito ngati chitsulo chosapanga dzimbiri, zinthu zachitsulo, magalasi owoneka bwino, nsungwi ndi zinthu zamatabwa kupukuta ndi kupukuta mchenga, ndikupanganso gudumu lopukutira utomoni, kudula zidutswa, nsalu za emery novel abrasive.