Zhao Hui Huang

Erosive Wear Behavior of Reaction Sintered Si3N4-SiCp Composite Ceramic in Liquid-Solid Flow

Si3N4-SiCp composites were prepared using fine Si powders as the starting materials for Si3N4, and SiCp as the aggregates. The erosive wear behavior of reaction sintered Si3N4-SiCp composite ceramic was investigated in liquid-solid flow. The results display that the composite ceramic hold a better capability of erosive wear resistance than 92 Al2O3 ceramics. The SEM pictures of the worn surface indicate that the main erosive wear mechanism of the composite ceramic is coexistence of micro-cutting and chisel-cutting.

Preparation of Wear-Resistant Ceramics with Tangshan Ironstone-Tailings

Wear-resistant ceramics were prepared successfully with Tangshan Ironstone-tailings. The effects of additives and sintering temperature on their mechanical property were studied. The erosive wear performance of ceramics was evaluated in liquid-solid flow. The erosive wear mechanism was also analyzed. The results showed that the wear-resistant ceramic prepared at 1200°C using 50wt% Tangshan Ironstone-tailings 10wt%, mild-clay and 40wt% high aluminum fly ash as the starting materials had high strength and good erosive wear resistance. The erosive wear mechanisms were washout particles’ micro-cutting and liquid washing.

Corrosion Behavior of BF Slag to SiAlON Bonded Corundum Refractories

The corrosion behavior of BF slag to sialon bonded corundum refractories using reaction nitriding technology at 1500°C was investigated by crucible test method. The results show that the reaction products of slag corrosion are anorthite, magnalium-spinel and glass phases. The corundum grains can react with MgO in the slag to produce magnalium-spinel, accompanying by expansion and liquating stepwise by slag. Erosion mechanism is oxidation-erosion-dissolving. This study is very necessary and useful to improve the property of BF slag resistance and to yield better overall properties of sialon bonded corundum refractories.