Reaction sintered Fe–Sialon ceramic composite: Processing, characterization and high temperature erosion wear behavior

Abstract

a b s t r a c tFe-Sialon ceramic matrix composite has been newly developed from ferro-silicon alloy and commercialgrade industrial alumina powders by reaction sintering under a nitrogen atmosphere. The phase composition, mechanical properties and impact erosion wear behavior were investigated. The solid particle erosion tests have been conducted at elevated temperatures ranging from 25 • C to 1200 • C. Sharp SiC particles between 325 and 830 m in diameter were employed as impact abrasives. The results showed that Fe-Sialon ceramic consisted of ␤-Sialon and Fe 3 Si phases. The Z value of the as-formed ␤-Sialon varied from 0 to 3.2 with increasing the alumina content in the starting powders. The bending strength and Rockwell hardness gradually increased with raising the alumina addition. The erosion rate of Fe-Sialon ceramic is highly dependent on the testing temperature. The minor erosion took place at room temperature or 1200 • C, while the major erosion occurred at 600-1000 • C. Fe-Sialon composites showed better erosion wear resistance than the control material of alumina ceramic at 1200 • C, although having much lower density and slightly lower bending strength.

Effect of In Situ Mg-Sialon on the Oxidation Behavior of Low-Carbon MgO-C Refractories

“…Previous research has shown that the physical and chemical properties of the material are regulated due to the point defects and lattice distortion caused by ion substitution [27][28][29]. With the doping of metal ions and the replacement of Al 3+ , the Eu-doped α-sialon, Fe-doped α-sialon, and Mg-doped α-sialon showed other unique properties, such as better optical properties, mechanical properties, or corrosion resistance [30][31][32]. In particular, Mg-doped α-sialon (also called Mg-sialon) has superior high-temperature strength due to a reduction in the intergranular glass phase and the achievement of the desired microstructure [33,34].…”