浸渗掺杂技术在制备半透明氧化铝陶瓷中的应用

doi:10.3724/SP.J.1077.2013.12255

摘要/Abstract

摘要：

实验证实了可以使用液相前驱体浸渗技术来均匀引入添加剂和制备半透明氧化铝陶瓷。首先在不同的浸渗条件下使用硝酸钇的水溶液浸渗了预烧的氧化铝坯体。通过线扫描表征了沿坯体厚度方向上的钇元素分布情况, 发现当试样厚度更小, 溶液浓度更低时, 钇元素分布更加均匀, 而且引入量的调控也更为精确。通过假设气孔被溶液完全填充, 提出了预测浸渗引入理论量的公式。最后使用浸渗方法制备了透明氧化铝陶瓷, 发现与球磨制备的样品相比, 浸渗制备的材料显微组织更为均匀, 透光性能也更好。

关键词: 浸渗, 半透明氧化铝, 光学性能, 掺杂, 均匀性

Abstract:

The feasibility to homogeneously incorporate additives and fabricate translucent alumina ceramics via liquid precursor infiltration technique was substantiated. Pre-sintered alumina compacts with various thickness values were infiltrated with aqueous yttrium nitrate solutions of different concentrations under various conditions. Line-scanning result of yttrium along the sample depth direction was investigated to characterize the doping homogeneity. It is found that better distribution homogeneity and more stringent control of a desired amount of dopants can be realized as the sample thickness and the solution concentration are decreased. By assuming all pores are open and completely saturated, the theoretical model is proposed to predict the amount of incorporated species by infiltration. Finally, translucent alumina ceramics were fabricated. Compared with ball-milling prepared counterparts, samples with improved microstructure and enhanced optical properties are achieved by infiltration.

Key words: infiltration, translucent alumina ceramics, optical properties, doping, homogeneity

中图分类号:

TQ174

刘冠伟, 谢志鹏, 吴音. 浸渗掺杂技术在制备半透明氧化铝陶瓷中的应用[J]. 无机材料学报, 2013, 28(4): 375-380.

LIU Guan-Wei, XIE Zhi-Peng, WU Yin. Application of Doping Ceramics via Infiltration on Translucent Alumina Ceramics[J]. Journal of Inorganic Materials, 2013, 28(4): 375-380.

图/表 10

图1 使用不同浓度的Y(NO3)3浸渗处理坯体后的实际增重与理论值对比

Fig. 1 Exprimental and theoretical weight increase of green bodies infiltrated by Y(NO3)3 solutions with different concentrations

图2 不同浓度的Y(NO3)3溶液的流变行为

Fig. 2 Rheology of Y(NO3)3 solutions with different concentrations

图3 Q1~Q4样品中从表面到内部的Y元素分布情况(线扫描)

Fig.3 Y element distribution profile of samples Q1-Q4

图4 浸渗过程中孔隙填充程度随坯体厚度的变化

Fig. 4 Degree of pore saturation during infiltration for samples with different green body thickness values

图5 坯体厚度为1.20 mm的样品在2.0 mol/L Y(NO3)3溶液中浸渗24 h并最终烧结后Y元素的分布情况

Fig. 5 Line-scanning result of Y element in sample (green body thickness 1.20 mm) infiltrated with 2.0 mol/L Y(NO3)3 solution

图6 浸渗制备的样品: 5M(左)和5M5Y(右)

Fig. 6 Samples prepared by infiltration: 5M (left), 5M5Y (right)

图7 3M、5M、10M和5M-C的显微组织

Fig. 7 Microstructure images of the specimens 3M(a), 5M(b), 10M(c) and 5M-C(d)

图8 3M、5M、10M和5M-C的直线透光率

Fig. 8 In-line transmission of the specimens 3M, 5M, 10M and 5M-C

图9 3M3Y、5M5Y、10M10Y和5M5Y-C的显微组织

Fig. 9 Microstructure of the specimens 3M3Y(a), 5M5Y(b), 10M10Y(c) and 5M5Y-C(d)

图10 3M3Y、5M5Y、10M10Y和5M5Y-C的直线透光率

Fig. 10 In-line transmission of the specimens 3M3Y, 5M5Y, 10M10Y and 5M5Y-C

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