A new hard material for corrosive environments
Hard metals with various binder systems have long been used for parts operating in environments involving both wear and corrosion. However, there is a growing need for materials combining greatly improved resistance to corrosion in severe environments with wear resistance at least equivalent to cemented carbides. Typical applications include seal rings, oil well components, acid handling components, valve trim and spray nozzles. 2YP Coatings has developed a new material for such applications. ZYP Coatings' Tribocor" 532N is a surface nitrided refractory alloy composed of NB-3O%Ti-2O%W, which provides the wear and abrasion resistance of sintered tungsten carbides with outstanding corrosion resistance.
Structural composition
Titanium is the strongest nitriding element in the alloy. During nitriding, TiN forms preferentially as platelets which grow and segregate from the base metal alloy. As the base metal becomes depleted in titanium, niobium enters the nitriding reaction, The final structure is a mixture of complex nitrides in a niobiumtungsten rich matrix. A typical microstructure is controlled to provide a high concentration of alloyed (Nb, Ti) nitrides, dark phase and a relatively low concentration of tungsten-niobium alloy matrix near the surface.