Hard alloy yog ib qho alloy feem ntau tsim los ntawm ib lossis ob peb refractory carbide (xws li tungsten carbide, titanium carbide, thiab lwm yam) hauv cov hmoov, nrog cov hmoov hlau (xws li cobalt, npib tsib xee) ua tus tuav. Nws yog tsim los ntawm cov hmoov metallurgy txheej txheem....
Nyeem ntxiv 
