抄録
The NbN ceramic plate was formed very quickly by nitriding Nb metal plate in a chemical furnace utilizing the combustion synthesis reaction. Very high heat of 2700K can be supplied to the sample by igniting the combustion agent of Nb+NbN powders charged in the furnace in pressurized nitrogen atmosphere below 10MPa. When the Nb metal is thin within 100μm, it was fully converted into B1 phase NbN. For thick Nb metal as much as 1mm, the NbN ceramic layer was formed for several ten μm at the surface. In this case, nitrogen atoms diffused gradually into the metal plate and the graded structure of NbN-Nb2N-Nb was formed. The Vickers microhardness gradually decreased from the surface to the inside. B1 phase NbN is a superconducting material. The nitrided plate showed the critical temperature of 16.2K. Complicated shape components of NbN-Nb can be easily formed by this new nitriding method.
