Thermal decomposition and crystallization behavior of Yb/Y co-doped SrZrO3 precursor used in the suspension plasma spray process

Gao, Yuanming ¹Bai, Yu ¹Zhang, Peng ¹Liang, Weicheng ¹Liu, Qi ¹Yan, Shufang ¹Huang, Jiao ¹Dong, Hongying ¹Wang, Ruigang ²Ma, Wen¹

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作者信息

1. Inner Mongolia Univ Technol
2. Univ Alabama
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Abstract

A double rare-earth (Yb/Y) co-doped SrZrO3 [Sr-1.0(Zr0.9Yb0.05Y0.05)O-2.95] thermal barrier coating was prepared via suspension plasma spraying (SPS). The rare-earth nitrates [Zr(NO3)4 center dot 5H(2)O, Sr(NO3)(2), Yb(NO3)(3)center dot 6H(2)O, Y (NO3)(3)center dot 6H(2)O] and NH4(C2O4)(2)center dot H2O were used to prepare the precursor suspension by co-precipitation. The thermal decomposition and crystallization of the precursor suspension powders calcined at 1200 degrees C were characterized with X-ray diffraction and a synchronous thermal analyzer coupled with quadrupole mass spec-trometry. Zr-2(C2O4)(2)(OH)(4) decomposed into Zr(C2O4)(2), ZrO2, and H2O initially, followed by the decomposition of Zr(CO3)(2) into ZrO2. The SrC2O4 precursor decomposed into SrCO3 and SrO consecutively. The ZrO2 reacted with SrO (Yb2O3, Y2O3) to generate the Yb/Y co-doped SrZrO3. And the Yb/Y co-doped SrZrO3 coating with a columnar crystal structure was prepared by SPS, which was analyzed with scanning electron microscopy, an inductively coupled plasma atomic emission spectrometer, and a laser flash analyzer. The thermal conductivity of the as-prepared coating was 1.77 W.m- 1.K-1 at 1000 ?C, which was more than 19% lower than that of the SPS SrZrO3 coating.

Key words

Suspension plasma spray/SrZrO3/Rare earth nitrates/STA/QMS/STRONTIUM ZIRCONATE/BARRIER COATINGS/PARAMETERS/YB2O3/INJECTION/Y2O3

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出版年

2022

Surface & Coatings Technology

ISTP

ISSN：0257-8972

被引量1

参考文献量55

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