β-sialon结合刚玉复合材料的性能

PROPERTIES OF β-SIALON BONDED CORUNDUM COMPOSITES

研究了矾土基β-sialon结合刚玉复合材料在高温使用下的力学性能、抗热震性、抗氧化及抗K2CO3的侵蚀等性能,并和氧化铝基β-sialon结合刚玉复合材料的性能进行了对比。结果表明:矾土基β-sialon结合刚玉复合材料的高温抗折强度在相同条件下均高于氧化铝基β-sialon结合刚玉复合材料;相同条件下,矾土基β-sialon结合刚玉复合材料热震后的残余抗析强度均高于氧化铝基β-sialon结合刚玉复合材料;β-sialon结合刚玉复合材料的氧化过程呈保护型氧化,温度高于1250℃时,矾土基β-sialon结合刚玉复合材料的氧化速率比氧化铝基β-sialon结合刚玉复合材料的低;在1 300℃的K2CO3液中侵蚀6 h后,β-sialon结合刚玉复合材料的抗K2CO3侵蚀性能比刚玉砖和高铝砖好得多。

Mechanical properties, thermal shock resistance, anti-oxidation and K2 CO3 -erosion resistance of bauxite-based β- sialon bonded corundum were investigated and compared with those of alumina-based β- sialon bonded corundum. Results show that the high temperature strength of rupture for bauxite based β- sialon bonded corundum is higher than that of alumina-based β- sialon bonded corundum under the same conditions, and the bauxite-based β- sialon bonded corundum shows a higher residue rupture strength after thermal shock than that of alumina-based β- sialon bonded corundum in the same conditions. The oxidation process of β-sialon/Al2O3, composite is a protective oxidation. The oxidation resistance of bauxite based β- sialon bonded corundum is better than that of alumina-based β- sialon bonded corundum when the temperature is over 1 250 ℃. Compared with high alumina brick and corundum brick, β-sialon bonded corundum displays much better property of K2CO3 -erosion resistance at 1 300 ℃ for 6 h.