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Only rutile titanium dioxide has a melting point and boiling point, rutile titanium dioxide, a melting point of 1850â, the melting point in oxygen-rich is 1879â. The melting point of titanium dioxide is related to the purity of the titanium dioxide.
Tungsten's melting point of 3422 Â°C is the highest of all metals and second only to carbon (3550 Â°C) among the elements. This is why tungsten is used in rocket nozzles and reactor linings. There are refractory ceramics and alloys that have higher melting points, notably $\ce{Ta4HfC5}$ with a melting point of 4215 Â°C, hafnium carbide at 3900 Â°C and tantalum carbide at 3800 Â°C. Carbon cannot be used to hold molten tungsten because they will react to form tungsten carbide.