摘要
为改善含铝MgO-C砖的抗水化性能,通过热力学计算选定添加K2CO3,研究了K2CO3对材料基质物相的影响。在此基础上,研究了单独外加硅粉和K2CO3(以K2O计)分别为0.5、1(wt%)与硅粉复合时对MgO-C砖抗水化性的影响。结果表明:单独添加Si粉对MgO-C砖抗水化性没有明显改善;Si粉与K2CO3复合添加时,能促使试样致密化,有效地提高试样的抗水化性能;其机理在于:K2CO3在加热过程中分解释放出O2,促进了Al粉的氧化,抑制了易水化产物Al4C3、AlN的生成。
In order to improve the hydration resistance of MgO-Al-C bricks, K2CO3 was chosen as an additive according to thermodynamic calculations. MgO-Al-C refractories were prepared by using Si, K2CO3 or both as additives. The effects of additives on the hydration resistance of specimens were investigated. XRD was conducted to determine the phase composition. The results showed that the hydration resistance of MgO-Al-C bricks would not be bettered with addition of only Si. However, it was helpful when K2CO3 was added along with Si due to the densification of the structure. The mechanism is that K2CO3 could decompose to give off oxygen during heating, which could promote the oxidation of A1 powder and inhibit the formation of Al4C3 and AlN.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2013年第3期482-485,共4页
Bulletin of the Chinese Ceramic Society
