Research on the Wear-Resisting Material Produced by Vacuum Evaporation Pattern Casting

Abstract

Vacuum Evaporation Pattern Casting (V-EPC) is one kind of Manufacturing for selectivity strengthened metal-based compound materials. The research was done on producing the steel base wear-resisting compound materials strengthened by Sic, analyzing microstructure characteristic with metallography microscope, testing the wear-resisting performance and dynamic mechanical propertie of the compound materials. The following conclusions were drown from the experiments.(1) In the process of composite preparation, the pouring temperature was 1600°C, the vacuum degree was 0.045MPa, the pouring was guided by the slow-fast-slow principle, and the pouring system was bottom-return pattern. (2) SiC particles distributed uniformly, retaining approximately quondam granular form in the composite layer and retaining good bonding strength with matrix. The microhardness testing of composite showed that the microhardness of composite layer were higher than matrix. (3) The best components of wear-resistant coating were SiC of 80 dimension and 40% volume fraction, Cr powder of 1.5% volume fraction, the rest of EPS particles. The grain wear testing showed the wear-resistant capability of composite was better than that of matrix, and the wear-resistant modulus of composite was 2.980 times than that of matrix. (4) The dynamic mechanical properties of vacuum Evaporation pattern casting steel matrix composites were tested on Φ14.5 split Hopkinson pressure bar. The stress-strain curves of the steel matrix composites and the matrix at the strain rate of 800/s were drown. The stress-strain curves showed that the vacuum Evaporation pattern casting steel matrix composites had better dynamic mechanical properties than the matrix.