Effect of Sodium Hexametaphosphate Addition Amount on Properties ofAl2O3-SiC-C Castable for Iron Runner
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摘要: 以棕刚玉为骨料，碳化硅、白刚玉粉、氧化铝微粉、六偏磷酸钠等为辅料制备Al2O3-SiC-C质铁沟浇注料，研究了六偏磷酸钠掺入量（0.05%~0.20%，质量分数）对浇注料致密性、力学性能和热力学性能的影响。结果表明：在110 ℃干燥及1 450 ℃烧成条件下，随着六偏磷酸钠掺入量的增加，浇注料试样的体积密度、耐压强度和抗折强度先增大后减小，显气孔率则先减小后增加；掺入0.10%六偏磷酸钠试样的线膨胀系数大于掺入0.15%六偏磷酸钠试样的；在低于1 150 ℃测试温度下，试样的导热系数随六偏磷酸钠掺入量的增加先增大后减小。综合考虑各项因素，六偏磷酸钠最佳掺入量为0.10%~0.15%。
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关键词:
- Al2O3-SiC-C质铁沟浇注料 /
- 六偏磷酸钠 /
- 致密性能 /
- 力学性能
Abstract: Al2O3-SiC-C castables for iron runner were prepared with brown corundum as aggregates and with silicon carbide, white corundum powder, alumina micropowder, sodium hexametaphosphate, etc., as auxiliary materials. Effect of sodium hexametaphosphate addition amount (0.05%-0.20%, mass fraction) on the compactness, mechanical properties and thermodynamic properties of the castables was investigated. The results show that after drying at 110 ℃ and firing at 1 450 ℃, the bulk density, compressive strength and flexural strength of the castable samples increased first and then decreased with increasing addition of sodium hexametaphosphate, while the apparent porosity decreased first and then increased. The linear expansion coefficient of the sample with 0.10% sodium hexametaphosphate was larger than that of the sample with 0.15wt% sodium hexametaphosphate. When the testing temperature was lower than 1 150 ℃, the thermal conductivity of the sample increased first and then decreased with increasing addition of sodium hexametaphosphate. Considering various factors, the optimal addition amount of sodium hexametaphosphate was 0.10%-0.15%. -
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