Hafnium nitride is primarily used in high-temperature and wear-resistant applications due to its exceptional thermal stability and hardness. It serves as a coating material in cutting tools and components exposed to extreme heat, such as in aerospace engines and gas turbines, where it helps prevent oxidation and mechanical degradation. Its high melting point and resistance to thermal shock make it suitable for use in refractory materials and ceramic composites. Additionally, hafnium nitride is explored in microelectronics as a conductive diffusion barrier in advanced semiconductor devices, particularly in gate electrodes for complementary metal-oxide-semiconductor (CMOS) technology. It also shows potential in nuclear reactor applications due to hafnium’s high neutron absorption capability, where the nitride form offers improved thermal performance over other compounds.