Niobium carbide (NbC and Nb2C) is an extremely hard refractory ceramic material, commercially used in tool bits for cutting tools. It is usually processed by sintering and is a frequent additive in cemented carbides. It has the appearance of a brown-gray metallic powder with purple lustre. It is highly corrosion resistant.
Niobium carbide is a frequent intentional product in microalloyed steels due to its extremely low solubility product in austenite, the lowest of all the refractory metal carbides. This means that micrometre-sized precipitates of NbC are virtually insoluble in steels at all processing temperatures and their location at grain boundaries helps prevent excessive grain growth in these steels. This is of enormous benefit, and the cornerstone of microalloyed steels, because it is their uniform, very fine grain size that ensures both toughness and strength. The only commonly occurring compound with a lower solubility and hence, greater potential for restricting the grain growth of steels is titanium nitride.
►Niobium carbide powder application:
As the hard alloy chemical additive, it is three Yuan, four Yuan carbide melting component, like WC-NbC-C ternary system and so on. May also make the purple artificial jewel. With the tungsten carbide, the carbonized molybdenum coordination, use in the hot forging die, the cutting tool, the jet engine turbine blade, the valve, the tail skirt and the rocket spray nozzle coating. Applies in domains and so on spray coating material, ultra hard membranous material, welding material.
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