添加Nd_2O_3对白云石烧结性能的影响
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摘要
添加不同比例Nd_2O_3到天然白云石中,采用二步煅烧法制备镁钙材料,研究了Nd_2O_3对白云石烧结性能的影响。结果表明,1 600℃烧结3 h条件下,没有添加Nd_2O_3的试样的体积密度为3.25 g/cm~3,显气孔率为3.8%,MgO晶粒尺寸为3.82μm;添加0.75%(质量分数)Nd_2O_3时,由于Nd_2O_3和MgO、CaO发生固溶反应,降低了其晶粒生长活化能,试样的体积密度提高为3.33 g/cm~3,显气孔率下降为2.8%,MgO晶粒尺寸增大至4.53μm。
Adding various contents of Nd_2O_3 into natural dolomite,magnesium-calcium materials were prepared by two-step calcination method,and the influence of Nd_2O_3 on sintering properties of dolomite was studied. The results show that the bulk density of samples without Nd_2O_3 is 3.25 g/cm~3,the apparent porosity is 3.8%,and the MgO grain size is 3.82 μm when sintered at 1 600 ℃ for 3 h. When 0.75%(mass percent)of Nd_2O_3 is added,the activation energy of grain growth is decreased due to the solid solution reaction of Nd_2O_3 with MgO and CaO. The bulk density of the sample increases to 3.33 g/cm~3,the apparent porosity decreases to 2.8%,and the MgO grain size increases to 4.53 μm.
Adding various contents of Nd_2O_3 into natural dolomite,magnesium-calcium materials were prepared by two-step calcination method,and the influence of Nd_2O_3 on sintering properties of dolomite was studied. The results show that the bulk density of samples without Nd_2O_3 is 3.25 g/cm~3,the apparent porosity is 3.8%,and the MgO grain size is 3.82 μm when sintered at 1 600 ℃ for 3 h. When 0.75%(mass percent)of Nd_2O_3 is added,the activation energy of grain growth is decreased due to the solid solution reaction of Nd_2O_3 with MgO and CaO. The bulk density of the sample increases to 3.33 g/cm~3,the apparent porosity decreases to 2.8%,and the MgO grain size increases to 4.53 μm.
引文
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[10]于燕文,杨正方.稀土金属氧化物对Mg O晶粒生长动力学影响研究[J].世界钢铁,2010,54(4):62.
[2]Suvorov S A,Nazmiev M I,Baranov A P,et al.A high-density water-resistant magnesia-lime material based on dolomite[J].Refractories&Industrial Ceramics,2005,46(3):217.
[3]顾华志,洪彦若.镁钙材料抗水化性能的研究发展[J].炼钢,2002,4(8):31.
[4]Ghosh A,Bhattacharya T K,Mukherjee B,et al.The effect of Cu O addition on the sintering of lime[J].Ceramics International,2001,27(4):2014.
[5]Ghosha A,Bhattacharya T K,Maitib S.Densification and properties of lime with V2O5additions[J].Ceramics International,2004,30(5):21170.
[6]Aygul Yeprem H.Effect of iron oxide addition on the hydration resistance and bulk density of doloma[J].Journal of the European Ceramic Society,2007,27(4):1651.
[7]袁聪,赵惠忠.铁红对白云石熟料烧结性和抗水化性的影响[J].耐火材料,2011,45(4):265.
[8]张汪年,邓宁.Cu O对白云石烧结性能的影响[J].粉末冶金技术,2016,34(3):277.
[9]游杰刚,张国栋.二氧化硅对锆酸钙材料结构及性能的影响[J].人工晶体学报,2014,43(5):1280.
[10]于燕文,杨正方.稀土金属氧化物对Mg O晶粒生长动力学影响研究[J].世界钢铁,2010,54(4):62.