关键词: 尖晶石-碳耐火材料, 应力缓释相, 线膨胀系数, 抗热震性

Abstract: To improve their thermal shock resistance,low carbon spinel-carbon refractories were prepared with MgAl₂O₄ and graphite as the main raw materials,and environmentally friendly asphalt Carbores P (CP),sodium tripolyphosphate and boron glass powder as the additives,insulating at 900 ℃ for 3 h in a carbon embedded atmosphere.The influence of additive types on the properties of the refractories was studied.The results show that:(1) the additives have little effect on the apparent porosity and bulk density of the samples;(2) compared to sodium tripolyphosphate,the addition of CP or boron glass powder significantly improves the cold modulus of rupture of the samples;while the addition of CP increases the hot modulus of rupture of the samples;(3) the introduction of sodium tripolyphosphate significantly reduces the thermal expansion coefficient and effectively improves the thermal shock resistance of the samples;(4) low carbon spinel-carbon refractories with high strength and good thermal shock resistance can be prepared by adding sodium tripolyphosphate.

Key words: spinel-carbon refractories, stress release phases, thermal expansion coefficient, thermal shock resistance