Daawaha adag waa daawaha ugu horrayn ka kooban hal ama dhowr karbide refractory (sida tungsten carbide, titanium carbide, iwm.) oo qaab budo ah, oo leh budo bir ah (sida cobalt, nikkel) oo u adeegaya sida xiraha.Waxa lagu soo saaray habka birta budada ah....
Akhri wax dheeraad ah