不同碳材料对铝碳浇注料性能的影响

含碳浇注料因碳材料的水润湿性差及高温氧化引起的材料性能差等问题一直备受关注。分别以热氧化石墨、ZrC包覆改性石墨和水热碳化生物质碳材料为碳源制备铝碳浇注料,研究不同碳材料对铝碳浇注料显气孔率、物理性能、物相组成,以及抗氧化性和抗渣侵蚀性能的影响。结果表明:引入热氧化石墨的浇注料具有最高的加水量,残留孔隙破坏了材料内部结构,浇注料机械性能较差;添加ZrC表面改性石墨可以降低浇注料的加水量,抗氧化性能较好,但对力学性能的提升无显著影响;以生物质碳材料为碳源可以显著提高浇注料的物理性能,相比于添加石墨的试样,生物质碳材料并未显著提升试样的抗渣侵蚀性能。

Influences of Different Carbon Materials on Properties of Alumina-Carbon Castables

Carbon containing castables have always attracted attention due to the poor water wettability of carbon materials and poor material properties caused by high-temperature oxidation. Thermal oxidized graphite, ZrC coated graphite and biomass carbon materials were added as carbon sources to alumina-carbon castables, and their influences on the apparent porosity, physical properties, phase composition, oxidation resistance and slag corrosion resistance were studied. The results show that the castable with thermal oxide graphite has the highest water addition, its residual pores impart the internal structure of the castable, leading to low mechanical properties. Adding ZrC coated graphite reduces the water addition of the castable, then gets better oxidation resistance and effects slightly the improvement of mechanical properties. Using biomass carbon material as carbon source significantly improves the physical properties of the castable, and compared to the sample with thermal oxidized graphite added, the biomass carbon material does not significantly improve the slag corrosion resistance of the sample.