Thermodynamic modeling of composition and propereties of self-fluxing materials based on the nickel

Abstract

Self-fluxing nickel or cobalt-based alloys that use boron, phosphorus or silicon, as melting point depressants and fluxing agents are thermodynamic simulation of self-fluxing materials Ni-0.5C-15Cr-3.2Si-2B (PGSR-2) and Ni-1C-17Cr-4.1Si-3.6B (PGSR-4) was performed. As the software for simulation of phase and chemical equilibrium the TERRA software package was used. The simulation was carried out in the temperature range 300–3000 K at a total pressure P = 105 Pa in an argon atmosphere. The temperature dependences of the equilibrium composition and thermodynamic characteristics (enthalpy, entropy, and Gibbs energy) of the alloys of the investigated systems were calculated. It is shown that Ni, Cr, C, Ni3B, Ni2B, NiB, Ni2Si, NiSi, CrB, CrSi can be formed in the condensed phase under equilibrium heating of PGSR-2. When PGSR-4 is heated in the condensed phase, along with the above components, Cr5B3, CrB2 and Cr3C2 compounds can be formed. The temperature dependences of the thermodynamic characteristics of the systems studied have kinks that can be explained by phase transformations.

Thermodynamic Modeling of Ni-Si-Cr-B-C System in Air and Propane Atmosphere

“…This method provides high performance and versatility, as well as a wide range of coatings properties. Powder self-fluxing materials are widely used for the restoration of worn surfaces by sputtering and sputtering with reflow [6,[9][10][11][12][13][14]. The most common of them are self-fluxing alloys of the Ni-Cr-Si-B system.…”