Nitride ceramic powders commonly used in thermal spraying

       Other transition metal nitrides include zirconium nitride (ZrN), hafnium nitride (HfN), and tantalum nitride (TaN), as well as aluminum nitride (AlN), a compound of metal aluminum and nitrogen.



      Zirconium nitride powder is yellowish brown and has high hardness. The use of vacuum plasma spraying technology to spray ZrN coating on the pre-spark gap electrode on the spark plug socket is one of its applications in engineering technology.

     Hafnium nitride powder is golden yellow, its melting point is the highest among nitrides, and its hardness is high, but it is easy to oxidize and is rarely used.

     Tantalum nitride is the nitride with the highest density and hardness.

     Aluminum nitride powder is yellow, has high temperature resistance and oxidation resistance, high hardness, and has the smallest thermal expansion coefficient among several nitrides, so it has excellent high temperature wear resistance.

     The combination of aluminum nitride and titanium carbide or titanium nitride can form composite carbonitride or composite nitride, and improve the lubricating ability of Co, Ni, Fe metal melts. And has good high temperature wear resistance.

     The above nitride ceramic powder should be sprayed by vacuum plasma spraying process to keep the nitrogen content and phase composition of the nitride coating unchanged.