添加Nd2O3对白云石烧结性能的影响  

Effect of Nd2O3 addition on the sintering properties of dolomite

作　　者：张汪年[1] 邓宁[1] 王永 ZHANG Wang-nian;DENG Ning;WANG Yong(College of Mechanical and Materials Engineering,Jiujiang University,Jiujiang 332005,Chin)

机构地区：[1]九江学院机械与材料工程学院

出　　处：《粉末冶金工业》2018年第4期42-46,共5页Powder Metallurgy Industry

基　　金：江西省“十二五”重点学科(材料加工工程)建设项目;九江学院科学技术研究基金(8651809,8400209)

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.

关 键 词：ND2O3 镁钙材料 白云石 活化能 

分 类 号：TQ175.1[化学工程—硅酸盐工业]