suure kulumiskindlusega tehnokeraamika; kasutatakse Al2O3-, SiC-, Si3N4-, ZrO2- jne baasil kulumiskindlat keraamikat (vt tehnokeraamika), ceramic materials that are resistant to friction and wear; the most widely used are alumina (Al2O3)-, silicon carbide (SiC)-, silicon nitride ((Si3N4)- and zirconia (ZrO2)- based ceramics (see: engineering ceramics)