Erosion Wear Characteristics and Mechanism of Si3N4 Ceramics: Effect of Impact Angle
Erosion wearing regulation with different erosion angel for Si3N4 ceramics were systematically studied by liquid-solid dual phase erosion wearing test with rotation disk through comparing with Cr15Mo3 high chromium cast iron for pumps in industry. Besides the micro failure mechanism and the relationship between mechanical behavior and anti erosion wearing have been analyzed for the experimental materials. The experimental results were concluded as following: the erosion resistance of Si3N4 ceramic is about 20 times better than that of Cr15Mo3 high-Cr cast ion in erosion test angle, and the effect of erosion angel on the erosion wearing volume lose features as N-shaped curve with the biggest volume lose at 45° erosion angle while most erosion wearing volume at 90° angle, which indicates that it should avoid 45° or 90° erosion angle during materials designing. Obvious direction and erosion trace are revealed and volume lose mainly featured with tiny cutting, pear ditch and erosion hole, and micro crack and grain falling off at high angle erosion on the surface of Cr15Mo3 materials, besides smooth surface, high ductile, compact structure, fine grain and fine cylinder grain explaining main reason for excellent anti erosion wearing for Si3N4 ceramic.
Wei Pan and Jianghong Gong
C. G. Bao et al., "Erosion Wear Characteristics and Mechanism of Si3N4 Ceramics: Effect of Impact Angle", Key Engineering Materials, Vols. 336-338, pp. 2465-2467, 2007