Research On The Erosion Wear Of Reactive Sintering Silicon Carbide

The effects of impact angle, erosive particles sizes and SiC particles size on the erosion and wear behaviors and mechanisms of reaction-bonded silicon carbide (RB-SiC) were studied by self made jet erosion tester. The erosion wear behavior and mechanism were analyzed and discussed combining with the microstructure analysis, XRD analysis and worn surface SEM observation. At the same time, the erosion wear behavior of high chromium cast iron was contrasted to studied to provide a reference for application of SiC ceramic as erosion wear resistant material.The research results showed that the erosive wear rates of reaction-bonded silicon carbide and high-chromium cast iron reached the peak value when the impact angle is 60°. And the erosive wear rate of high-chromium cast iron was more than that of reaction-bonded silicon carbide at any erosion angle. When the impact angle was from 30°to 60°, the erosion wear rate of reaction-bonded silicon carbide would be increased. The erosion mechanism of reaction-bonded silicon carbide is dominated by micro-cutting of abrasive particles. When the abrasive particles impacted the surface of RB-SiC at 60°, the impact action of particles increased and the micro-cutting action of particles decreased so that the erosion wear rates of tested materials would reach the peak value at impact angle 60°. When the impact angle of particles was from 60°to 90°, the materials were subjected to the impact action of particles, therefore, the erosion wear rates of tested materials would be decreased with the increase of impact angle of particles.The erosion wear rates of RB-SiC eroded by coarse particles would be higher than that of eroded by fine particles. This indicated that the RB-SiC possess better erosion wear resistance to fine erosion particles. When the coarse particles impacted the surface of RB-SiC, RB-SiC was subjected to not only the micro-cutting of particles heavily, but also the impact action of particles largely. Thus the The erosion wear rates of RB-SiC would be increased when the coarse particles impact its surface.The erosion wear rates of RB-SiC would be affected by the original SiC particle sizes. It would be decreased with the increase of original SiC particle sizes, because the amount of free silicon would be increased, and the amount of free carbon and fracture strength would be decreased when the original SiC particle sizes were larger. The results showed that the erosion wear resistance of RB-SiC with 120 urn SiC particle size would be better than that of other particle sizes RB-SiC.