Nickel-based Wear-Resistant Alloy

The main alloying elements are chromium, molybdenum, tungsten, and also contain a small amount of niobium, tantalum and indium. In addition to wear resistance, it also has good oxidation resistance, corrosion resistance and welding properties. It can be used to manufacture wear-resistant parts, and can also be used as a coating material, which can be coated on the surface of other base materials through surfacing and spraying processes.
Nickel-based alloy powders include self-fluxing alloy powders and non-self-fluxing alloy powders.
Non-self-fluxing nickel-based powders refer to nickel-based alloy powders that do not contain B, Si or have low B and Si content. This type of powder is widely used in plasma arc spray coatings, flame spray coatings and plasma surface strengthening. Mainly include: Ni-Cr alloy powder, Ni-Cr-Mo alloy powder, Ni-Cr-Fe alloy powder, Ni-Cu alloy powder, Ni-P and Ni-Cr-P alloy powder, Ni-Cr-Mo-Fe alloy powder, Ni-Cr-Mo-Si high wear-resistant alloy powder, Ni-Cr-Fe-Al alloy powder, Ni-Cr-Fe-Al-B-Si alloy powder, Ni-Cr-Si alloy powder, Ni-Cr-W based wear-resistant and corrosion-resistant alloy powder, etc.
Adding appropriate amount of B and Si to nickel alloy powder forms nickel-based self-fluxing alloy powder. The so-called self-fluxing alloy powder is also called low eutectic alloy, hard-facing alloy, which is a series of powder materials formed by adding alloying elements (mainly boron and silicon) that can form low melting point eutectic to nickel, cobalt and iron-based alloys. Commonly used nickel-based self-fluxing alloy powders include Ni-B-Si alloy powder, Ni-Cr-B-Si alloy powder, Ni-Cr-B-Si-Mo, Ni-Cr-B-Si-Mo-Cu, high-molybdenum nickel-based self-fluxing alloy powder, high-chromium-molybdenum nickel-based self-fluxing alloy powder, Ni-Cr-W-C-based self-fluxing alloy powder, high-copper self-fluxing alloy powder, tungsten carbide dispersion type nickel-based self-fluxing alloy powder, etc.
The role of various elements in the alloy:
● The role of boron and silicon: significantly reduce the melting point of the alloy, expand the solid-liquid phase temperature zone, and form a low-melting eutectic; deoxidation reduction and slag-making functions; hardening and strengthening of the coating; improve the operating process performance
● The role of copper: improve the corrosion resistance to non-oxidizing acids
● The role of chromium: solid solution strengthening and passivation; improve corrosion resistance and high-temperature oxidation resistance; excess chromium easily forms chromium carbide and chromium boride hard phases with carbon and boron to improve the hardness and wear resistance of the alloy
● The role of molybdenum: large atomic radius, large lattice distortion after solid solution, significantly strengthen the alloy matrix, improve the high-temperature strength and red hardness of the matrix; can cut and reduce the network structure in the coating; improve the ability to resist cavitation and erosion.