以电熔镁砂及鳞片石墨为主要原料,热塑性酚醛树脂为结合剂,研究了α-Al_2O_3微粉对低碳MgO-C材料性能的影响.结果表明:(1)Al_2O_3微粉的加入提高了低碳MgO-C材料的体积密度,降低了显气孔率,提高了强度,显著改善了MgO-C砖的抗氧化性;(2)高温下Al_2O_3微粉与MgO原位反应生成连续的尖晶石相,改善了材料基质的显微结构,增强了陶瓷结合,将MgO颗粒与鳞片石墨紧密地结合起来,提高了组织结构的整体性,从而提高了材料的致密度和强度;(3)高温下原位反应生成连续的尖晶石相堵塞脱碳层中的部分气孔,降低了氧的扩散速度,同时提高了MgO的沉积速度,使加入Al_2O_3微粉的低碳MgO-C材料抗氧化性能得以提高.
Effects of α-Al_2O_3 micro-powder on properties of low carbon MgO-C refractories were investigated with fused magnesia and flake graphite as starting materials, and Novolak phenolic resin as binder. The results show that: (1) with Al_2O_3 micro-powder addition, apparent porosity of MgO-C refractories decreases, both bulk density and MOR increase, and especially oxidation resistance improves noticeably. (2) The reaction of Al_2O_3 micro-powder in the matrix of MgO-C improves the textual integrity of MgO-C refractories and ceramic bonding, due to formation of an continuous in-situ spinel matrix. (3) The inward diffusion velocity of oxygen through the porous decarburized layer is slowed down by the formation of MgO dense layer and continuous in-situ spinel matrix, which results in the improvement of oxidation resistance.
参考文献
| [1] | 朱伯铨,张文杰.低碳镁碳砖的研究现状与发展[J].武汉科技大学学报(自然科学版),2008(03):233-237. |
| [2] | A.S. Gokce;C. Gurcan;S. Ozgen .The effect of antioxidants on the oxidation behaviour of magnesia-carbon refractory bricks[J].CERAMICS INTERNATIONAL,2008(2):323-330. |
| [3] | 覃显鹏,李远兵,洪学勤,吴勇来,李亚伟.碳氮化钛的加入量对低碳镁碳砖性能的影响[J].武汉科技大学学报（自然科学版）,2008(02):189-192,197. |
| [4] | 李友胜,张唐文,鲍家兴,李楠,朱万政.加入Si粉对低碳铝镁碳材料性能的影响[J].耐火材料,2007(04):245-248. |
| [5] | 华旭军,朱伯铨,李雪冬,方斌祥,范正赟.TiC-C复合粉体的制备及其对低碳镁碳砖抗氧化性能的影响[J].武汉科技大学学报（自然科学版）,2007(02):145-148. |
| [6] | 贺智勇,彭小艳,李林,刘开琪.ZrB2对低碳镁碳材料抗氧化性能的影响[J].耐火材料,2006(04):280-282. |
| [7] | Takanaga S;Ochiai T;Tamura S.Nano-Tech.Refractories-2:The application of the nano Structural matrix to MgO-cbricks[A].Japan,2003:521-524. |
| [8] | 朱强,孙勇,于景坤,马北越.SiC-Al2O3复合粉体的合成以及在低碳镁碳砖中的应用[J].材料与冶金学报,2008(02):118-121. |
| [9] | Ganesh I;Bhattacharjee S;Saha B P et al.An efficient MgAl_2O_4 spinel additive for improved slag erosion and penetration resistance of high-Al_2O_3 and MgO-C refractories[J].Ceramics International,2002,28(03):245-253. |
| [10] | A. Banerjee;S. Das;S. Misra .Structural analysis on spinel (MgAl_2O_4) for application in spinel-bonded castables[J].CERAMICS INTERNATIONAL,2009(1):381-390. |
| [11] | M. Bavand-Vandchali;F. Golestani-Fard;H. Sarpoolaky .The influence of in situ spinel formation on microstructure and phase evolution of MgO-C refractories[J].Journal of the European Ceramic Society,2008(3):563-569. |
| [12] | Lee W E;Zhang S;Li N.Microstructural characterization of in situ matrix phase formation in refractories[A].Orlando,United States,2006:326-329. |
| [13] | Zhang S;Marriott N J;Lee W E .Thermochemistry and microstructures of MgO-C refractories containing various antioxidants[J].Journal of the European Ceramic Society,2001,21(08):1037-1047. |
| [14] | Faghihi-Sani M A;Yamaguchi A .Oxidation kinetics of MgO-C refractory bricks[J].Ceramics International,2002,28(08):835-839. |
| [15] | Li XM.;Palco S.;Rigaud M. .OXIDATION KINETICS OF GRAPHITE PHASE IN MAGNESIA-CARBON REFRACTORIES[J].Journal of the American Ceramic Society,1995(4):965-971. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%