(La1-xMgx)2Ce2O7-x的合成与热物理性能

doi:10.15541/jim20140144

摘要/Abstract

摘要：

Mg对La₂Ce₂O₇的掺杂可提高其热膨胀系数、降低其热导率, 从而改善其作为热障涂层材料的性能。采用溶胶-凝胶法制备了(La_1-_xMg_x)₂Ce₂O_7-_x系列组成样品。X射线测试表明: 当 0≤x≤0.4时, 所有(La_1-_xMg_x)₂Ce₂O_7-_x 样品均与La₂Ce₂O₇具有相同的缺陷萤石结构, 且晶胞参数随x的增大而递减; 当x?0.4时, 样品中出现MgO的峰。在组成相同的情况下, 样品(La_1-_xMg_x)₂Ce₂O_7-_x (0≤x≤0.4)的热膨胀系数随温度升高而增大, 而热导率随温度升高而降低。在相同温度下, 不同组成样品(La_1-_xMg_x)₂Ce₂O_7-_x (0≤x≤0.4)的热膨胀系数随x的增大而增大; 而样品的热导率则随Mg掺杂量的增加呈先增大后减小的趋势。在此基础上, 探讨了Mg掺杂对La₂Ce₂O₇的物相、晶胞参数、热膨胀系数以及热导率的影响机理。

关键词: 铈酸镧, 镁掺杂, 热膨胀系数, 热导率, 热障涂层陶瓷

Abstract:

Doping magnesium into La₂Ce₂O₇ can increase its thermal expansion coefficient (TEC) and decrease its thermal conductivity (TC), thus improve its performance for thermal barrier coating (TBC). (La_1-_xMg_x)₂Ce₂O_7-_x ceramics were prepared by Sol-Gel method. Powder X-Ray diffraction results revealed that (La_1-_xMg_x)₂Ce₂O_7-_x showed the identical structure as La₂Ce₂O₇ (defect-fluorite type), and the crystal parameter decrease with increasing x value in the range of 0≤x≤0.4, and MgO occurred in the product when x?0.4. The TEC of (La_1-_xMg_x)₂Ce₂O_7-_x sample (0≤x≤0.4) with the same composition increases with the increasing temperature, whereas the TC presents the opposite trend. At the same temperature, the TEC of the (La_1-_xMg_x)₂Ce₂O_7-_x sample (0≤x≤0.4) with different composition increases with increasing x value whereas the TC increases firstly and then decreases with the increasing of x value, where x=0.2 nearby as turning point. In addition, possible mechanisms of the influence of Mg doping on the structure, crystal parameter, TEC and TC of La₂Ce₂O₇ are discussed.

Key words: La2Ce2O7, magnesium-doped, thermal expansion coefficient, thermal conductivity, thermal barrier coating ceramic

中图分类号:

O641

杨斌, 李林艳, 范闽光, 李斌, 徐盛明, 王建龙, 林旭平. (La_1-_xMg_x)₂Ce₂O_7-_x的合成与热物理性能[J]. 无机材料学报, 2014, 29(12): 1301-1305.

YANG Bin, LI Lin-Yan, FAN Min-Guang, LI Bin, XU Sheng-Ming, WANG Jian-Long, LIN Xu-Ping. Synthesis and Thermophysical Properties of (La_1-_xMg_x)₂Ce₂O_7-_x[J]. Journal of Inorganic Materials, 2014, 29(12): 1301-1305.

图/表 8

图 1 溶胶-凝胶法合成Mg掺杂La2Ce2O7样品((La1-xMgx)2Ce2O7-x)的XRD图谱

Fig. 1 XRD patterns of the Mg2+-doped La2Ce2O7 products ((La1-xMgx)2Ce2O7-x) synthesized by Sol-Gel method

图 2 (La1-xMgx)2Ce2O7-x的晶格常数随Mg掺杂量的变化

Fig. 2 Mg2+-doping dependence of the crystal parameter (a) of (La1-xMgx)2Ce2O7-x

图 3 (La1-xMgx)2Ce2O7-x样品的热膨胀系数随温度的变化曲线

Fig. 3 Change of the thermal expansion coefficient (TEC) of (La1-xMgx)2Ce2O7-x with temperature

表 1 (La1-xMgx)2Ce2O7-x样品的实测密度和理论密度

Table 1 Measured and theoretical density of (La1-xMgx)2Ce2O7-x

x	0	0.1	0.2	0.3	0.4
ρ/(g·cm^-3)	5.79	6.05	6.02	5.76	5.44
ρ₀/(g·cm^-3)	6.43	6.23	6.02	5.82	5.60

图 4 (La1-xMgx)2Ce2O7-x样品的比热随温度的变化曲线

Fig. 4 Change of the specific heat capacity of (La1-xMgx)2Ce2O7-x with temperature

图 5 (La1-xMgx)2Ce2O7-x样品的扩散系数随温度的变化曲线

Fig. 5 Change of the thermal diffusivities of (La1-xMgx)2Ce2O7-x with temperature

图 6 (La1-xMgx)2Ce2O7-x样品的热导率随温度的变化曲线

Fig. 6 Change of the thermal conductivity of (La1-xMgx)2Ce2O7-x with temperature

图 7 1000℃下, (La1-xMgx)2Ce2O7-x样品的热导率随镁掺杂量的变化曲线

Fig. 7 Composition dependence of the thermal conductivity for (La1-xMgx)2Ce2O7-x at 1000oC

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(La_1-_xMg_x)₂Ce₂O_7-_x的合成与热物理性能

Synthesis and Thermophysical Properties of (La_1-_xMg_x)₂Ce₂O_7-_x

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