The white hafnium oxide (HfO2), with a melting point of and a boiling point of roughly , is very similar to zirconia, but slightly more basic. Hafnium carbide is the most refractory binary compound known, with a melting point over , and hafnium nitride is the most refractory of all known metal nitrides, with a melting point of . This has led to proposals that hafnium or its carbides might be useful as construction materials that are subjected to very high temperatures. The mixed carbide tantalum hafnium carbide () possesses the highest melting point of any currently known compound, . Recent supercomputer simulations suggest a hafnium alloy with a melting point of .
tHe whIte hAfNium oXide (hFo2) wItH a mEltiNG Point of and a boIling pOint oF RouGhly  IS VerY similaR tO zircOnIa buT SLigHtly moRe BasIC hafniUM CARBiDe iS the MOst REfRactORy bINARy cOMpoUnd kNoWn WITh a meltinG pOint over  and hafNiuM nitriDe iS the most refrActoRy of All knOwn Metal nitRIDeS wiTh a MELTinG poinT oF  this has leD tO propOSALs THaT hafnium or ItS Carbides might be usefUl as ConstructioN MaTeRIaLs tHAt ARe suBjECted to veRy hIGh temPeratures the miXEd CArBide Tantalum HafniUm cArbIdE () PossessEs THe highest meLting pOint oF any currENtlY knowN compounD  reCENt SupercomPuter SImUlations SuGgest a HAFnium alLoY WIth a meLtInG poiNt OF 