zirconium boride

zirconium boride

[‚zər′kō·nē·əm ′bȯr‚īd] (inorganic chemistry) ZrB2 A hard, toxic, gray powder that melts at 3000°C; used as an aerospace refractory, in cutting tools, and to protect thermocouple tubes. Also known as zirconium diboride.