کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10625126 | 989615 | 2014 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Low thermal conductivity in La2Zr2O7 pyrochlore with A-site partially substituted with equimolar Yb2O3 and Er2O3
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
(La1â2xYbxErx)2Zr2O7 ceramics were synthesized using the solid state reaction method and their thermophysical properties were investigated. All (La1â2xYbxErx)2Zr2O7 ceramics were composed of the pure pyrochlore phase. The average thermal expansion coefficients of the (La1â2xYbxErx)2Zr2O7 ceramics ranged from 9.54 to 9.78Ã10â6 Kâ1. The substitution of Yb3+ and Er3+ for La3+ substantially reduced the thermal conductivity of La2Zr2O7. The thermal conductivity decreased from 2.12 W mâ1 Kâ1 for the composition with x=0 to 1.27 W mâ1 Kâ1 for which with x=0.05 at 26 °C. In addition, the thermal conductivity for the composition with x= 0.05 was less sensitive to temperature variation, which ranged from 1.22 to 1.32 W mâ1 Kâ1 in the measuring temperature range. These results suggested promising potential applications of the (La1â2xYbxErx)2Zr2O7 ceramics for high temperature thermal barrier coatings.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 40, Issue 7, Part A, August 2014, Pages 9151-9157
Journal: Ceramics International - Volume 40, Issue 7, Part A, August 2014, Pages 9151-9157
نویسندگان
Yonghe Zhang, Min Xie, Fen Zhou, Xiangzhong Cui, Xingeng Lei, Xiwen Song, Shengli An,