Alloy siri ike bụ ihe mejupụtara nke otu ma ọ bụ ọtụtụ carbide refractory (dị ka tungsten carbide, titanium carbide, wdg) n'ụdị ntụ ntụ, nwere ntụ ntụ (dị ka cobalt, nickel) na-eje ozi dị ka ihe nkedo.A na-arụ ya site na usoro nchara ntụ ntụ....
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