③Kayan yumbu da aka fi amfani da shi tun daga karni na 21, yumburan harsashi sun bunkasa cikin sauri, kuma akwai nau'o'in iri da yawa, wadanda suka hada da alumina, silicon carbide, boron carbide, silicon nitride, titanium boride, da sauransu, daga cikinsu akwai alumina ceramics (Al₂O₃), silica carbide cera...
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