High-temperature sliding wear resistant Cr₁₃Ni₅Si₂/γ-Ni ternary metal silicide composite

A wear resistant metal silicide composite consisting of Cr₁₃Ni₅Si₂ ternary metal silicide dendrites and the nickel-base solid solution (γ) matrix (Cr₁₃Ni₅Si₂/γ) was designed and fabricated by the laser melting/continuous deposition process. High-temperature sliding wear resistance as a function of wear test temperature and high-temperature sliding wear mechanisms of the Cr₁₃Ni₅Si₂/γ composite were studied. The results indicate that the Cr₁₃Ni₃Si₂/γ composite has excellent wear resistance, low temperature-sensitivity of wear and anomalous wear-temperature dependence under high-temperature sliding wear test conditions due to the strong atomic binding forces and anomalous hardness-temperature dependence of Cr₁₃Ni₅Si₂, good toughness and strength of the Cr₁₃Ni₅Si₂/γ composite and the transferred cover-layer on the worn surface of the Cr₁₃Ni₅Si₂/γ composite during the high-temperature sliding wear process. The wear resistance of the Cr₁₃Ni₅Si₂ ternary metal silicide at 600°C was improved to 4 times by adding a ductile γ-Ni matrix.