Zirconium Carbide ZrC

Zirconium carbide (ZrC) is a refractory interstitial carbide with a high melting point. It is produced by CVD mostly on an experimental basis although it has some nuclear applications. Like TiC, cubic ZrC has a variable composition and forms solid solutions with oxygen and nitrogen over a wide range of composition. Its characteristics and properties are summarized in Table 9.10. 

Zirconium carbide (ZrC) is used for light bulb filaments, for cladding metals to protect them from corrosion, in making adhesives, and as a high-temperature lining for refractory furnaces. 

Zirconium Carbide, ZrC grey pdr, not attacked by w, NH or HCI even when heated. 

Zirconium Carbide, ZrC grey pdr, not attacked by w, NH or HC1 even when heated. It is harder than quartz but softer than ruby. Was first prepd by Moissan et al on heating a mixt of Zr oxide with carbon in an electric furnace... 

The interstitial or refractory carbides are the most important of the three classes these are formed by the transition metals, the most stable being the carbides of the metals in Groups IVa, Va, and Via. Such carbides may be made from the elements at high temperatures under pressure and resemble the metals themselves. They tend, however, to be much harder and higher melting than the parent metals. The melting points, (admittedly approximate) of tantalum carbide, TaC, (4200° C) and zirconium carbide, ZrC, (3800° C) may be compared with those of tungsten... 

Zirconium carbide, ZrC, and hafnium carbide, HfC, can be manufactured in a similar way to titanium carbide. They are not very important in cemented carbide technology. The recent strong reduction in the price of HfC has enabled its application as a substitute for the dearer tantalum carbide. 

The heats of formation have been measured for a range of non-stoicheiometric zirconium carbides ZrC, (x = 0.716—0.990). Differences in details of the bands in the X-ray emission spectra of the zirconium silicides Zr3Si, Zr5Si3, Zr3Si2, and ZrSi2 have been related to the type of crystal lattice of the solid silicide. ... 

Zirconium carbide, ZrC, is made by reacting Zr02 or zircon with graphite in an electric furnace. It has a very high melting point, 3420°C. It reacts with chlorine at SOO C to produce ZrCU. 

ZIRCONIUM CARBIDE (ZrC) (N/A) Finely divided material is spontaneously flammable in air. Reacts with strong oxidizers, bromine, chlorine, fluorine, iodine. Dusts of zirconium compounds ignite and explode in a carbon dioxide atmosphere. 

An adherent and continuous crystal of zirconium carbide, ZrC, has been grown on the surface of graphite at 1100 °C in the presence of zirconium, zirconium(iv) chloride, and hydrogen according to the equations ... 

Zirconium Carbide. ZrC m.p. 3530 C sp. gr. 6.7 thermal expansion (25-2000°C) 7.5 X 10-6. TTie face-centred cubic form is stable at least up to 2650°C. This special refractory material has been used in the manufacture of a flame deflector operating at very high temperatures. 

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