ZTA/high Ni–Cr alloy steel composites prepared by liquid phase sintering

Abstract

The interfacial bonding, wear resistance, corrosion resistance and high temperature oxidation resistance of ZTA/high Ni–Cr alloy steel composites prepared by liquid phase sintering were investigated. The results showed that the ZTA particles bonded well with high Ni–Cr alloy steel matrix and produced transition new phases, including (Al, Cr)2O3, Al60Mn11Ni4, Mn2SiO4, MnCr2O4, (Mn, Fe)2SiO4 and MnSiO3. With the addition of ZTA particles, the wear resistance of the composites was reduced substantially. When the ZTA content is 40 vol%, the wear resistance is two times of the matrix, which is better than that of the Cr16 material. The small content of ZTA particles added can enhance the corrosion resistance of the composites. When ZTA was in small amounts, there was passivation of the samples and the corrosion resistance increased. When the content of ZTA reaches 30 vol%, the passivation phenomenon disappears. The corrosion resistance of the composites is much higher than that of the Cr16 material. The composites have good resistance to high temperature oxidation at temperatures below 700 °C. Industrial testing of plate hammers was carried out on a corrosive slag machine at a high temperature of 700 °C. The results show that the ZTA/high Ni–Cr alloy steel composite has twice the service life of the Cr26 material.