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以柠檬酸镁和氧化铝为原料,采用埋碳烧结法合成纳米碳/镁铝尖晶石复合粉,并代替铝碳耐火材料中的部分石墨,通过X射线衍射仪、场发射扫描电子显微镜以及能谱分析仪表征纳米碳/镁铝尖晶石复合粉,研究了加入不同量的复合粉对铝碳耐火材料物理性能、抗氧化性、抗渣侵蚀性以及抗热震性的影响。结果表明:纳米碳/镁铝尖晶石复合粉中碳分布均匀,分散在尖晶石晶粒表面或者夹杂在晶粒之间,使得复合粉在铝碳耐火材料抗侵蚀性和抗热震性等方面有显著作用。与空白样品相比,加入4.5%(质量分数)纳米碳/镁铝尖晶石复合粉的样品抗渣侵蚀性能提高71.3%;且抗热震性能有所改善,残余强度保持率提高43.2%。表明纳米碳/镁铝尖晶石复合粉能提高低碳铝碳耐火材料的性能。
Abstract：A nano-carbon/MgAl_2O4 spinel composite powder was prepared with magnesia citrate and alumina via buried carbon-bed sintering. The nano-carbon/MgAl_2O4 spinel composite powder was investigated by X-ray diffraction, field emission scanning electron microscopy and energy dispersive spectroscopy. The effect of composite powder amount on the physical properties, oxidation resistance, slag corrosion resistance and thermal shock resistance for low-carbon Al_2O3–C refractories was investigated. The results show that carbon in the nano-carbon/MgAl_2O4 spinel composite powder is equally distributed, and attached onto the spinel grain surface or mixed between the grains, leading to the composite powder having the corrosion resistance and thermal shock resistance for the low-carbon Al_2O3–C refractories. Compared to the blank sample, the corrosion resistance of the sample with nano-carbon/MgAl_2O4 spinel composite powder of 4.5%(in mass fraction) is increased by 71.3%, the thermal shock resistance is improved, and the residual strength retention rate is increased by 43.2%, thus indicating that the nano-carbon/MgAl_2O4 spinel composite powder can improve the properties of low-carbon Al_2O3–C refractories.
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基本信息:
DOI：10.14062/j.issn.0454-5648.20200921
中图分类号:TQ175.1
引用信息:
[1]李国丹,丁冬海,肖国庆,等.纳米碳/镁铝尖晶石复合粉对低碳铝碳耐火材料性能的影响[J].硅酸盐学报,2021,49(09):2036-2044.DOI:10.14062/j.issn.0454-5648.20200921.
基金信息:
陕西省重点研发项目(2018ZDXM-GY-128); 国家自然科学基金(NO.51572212,51772236); 陕西省教育厅协同创新项目(Z20200170)
2021-07-25
2021-07-25
2021-07-25