等离子喷涂ZrO2涂层显微结构表征和热导率分析

doi:10.3724/SP.J.1077.2012.11743

无机材料学报 ›› 2012, Vol. 27 ›› Issue (5): 550-554.DOI: 10.3724/SP.J.1077.2012.11743 CSTR: 32189.14.SP.J.1077.2012.11743

等离子喷涂ZrO₂涂层显微结构表征和热导率分析

王墉哲¹, 吴伟¹, 华佳捷¹, 曾毅¹, 郑学斌², 周莹³, 王虎³

(1. 中国科学院上海硅酸盐研究所, 高性能陶瓷和超微结构国家重点实验室, 上海 200050; 2. 中国科学院上海硅酸盐研究所, 特种无机涂层重点实验室, 上海 200050; 3. 上海市计量测试研究院, 上海 201203)

收稿日期:2011-12-02 出版日期:2012-05-10 网络出版日期:2012-03-31
作者简介:WANG Yong-Zhe(1985-), male, candidate of master degree. E-mail: yongzhew@student.sic.ac.cn

Microstructure Characterization and Thermal Conductivity Analysis of Plasma Sprayed ZrO₂ Coatings

WANG Yong-Zhe¹, WU Wei¹, HUA Jia-Jie¹, ZENG Yi¹, ZHENG Xue-Bin², ZHOU Ying³, WANG Hu³

(1. The State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; 2. Key Laboratory of Inorganic Coating Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; 3. Shanghai Institute of Measurement and Testing Technology, Shanghai 201203, China)

Received:2011-12-02 Published:2012-05-10 Online:2012-03-31
About author:WANG Yong-Zhe(1985-), male, candidate of master degree. E-mail: yongzhew@student.sic.ac.cn
Supported by:
Foundation item: Science and Technology Innovation Project of Shanghai Institute of Ceramics(Y17ZC5150G);Research Fund for Nanomaterials of Shanghai (11nm0506900)

摘要/Abstract

摘要：

利用大气等离子喷涂制备了ZrO₂涂层, 采用扫描电子显微镜结合图像分析的方法对涂层的显微结构特征(总气孔率和大气率)进行了量化表征. 同时利用扫描电子显微镜附带X射线扫描成像对涂层内部的微裂纹和大的分隔裂纹的三维分布进行了表征. 据此建立了ZrO₂涂层显微结构与热导率之间的关系. 室温下, 涂层N2的热导率较N1的低, 因为涂层N2内气孔和微裂纹数较多; 在1000℃, 由于微裂纹的烧结作用导致热导率增大, 所以涂层N2的热导率较N1反而高. 高温下, 涂层内由微裂纹汇聚而形成的大的分隔裂纹的存在则可以有效地抑制烧结, 降低涂层的热导率.

关键词: ZrO₂涂层, 显微结构, 热导率, X射线显微术

Abstract:

Yttria stabilized zirconia coatings were deposited using two different sets of parameters (N1, N2 coating). The microstructure features, such as total porosity and large porosity, were quantified by means of scanning electron microscope and image analysis. The three-dimensional distribution of microcracks and segmentation cracks was successfully revealed by the X-ray microscopy in the scanning electron microscope with three-dimensional microtomography capability. So the relationship between microstructure and thermal conductivity was found. At room temperature, thermal conductivity of N2 was lower than that of N1 due to larger pores and microcracks. At 1000℃ thermal conductivity of N1 was lower for the sintering of microcracks. The segmentation cracks formed by the propagation of microcracks could effectively reduce the thermal conductivity at high temperature.

Key words: ZrO₂ coatings, microstructure, thermal conductivity, X-ray microscopy

中图分类号:

TQ174

王墉哲, 吴伟, 华佳捷, 曾毅, 郑学斌, 周莹, 王虎. 等离子喷涂ZrO₂涂层显微结构表征和热导率分析[J]. 无机材料学报, 2012, 27(5): 550-554.

WANG Yong-Zhe, WU Wei, HUA Jia-Jie, ZENG Yi, ZHENG Xue-Bin, ZHOU Ying, WANG Hu. Microstructure Characterization and Thermal Conductivity Analysis of Plasma Sprayed ZrO₂ Coatings[J]. Journal of Inorganic Materials, 2012, 27(5): 550-554.

图/表 7

Table1 Parameters of plasma spray gun

Sample	Current/A	Ar/(L?min^-1)	H₂/(L?min^-1)	Spray distance/mm	Temperature/℃	Velocity/(m?s^-1)
N1	650	35	12	120	3277	201
N2	550	35	12	120	3174	182

Fig. 1 SEM images of cross section of polished coatings

Fig. 2 Volume fractions of pores in N1 and N2 coatings

Fig. 3 X-ray microscopy images of N1 coating

Fig. 4 X-ray microscopy images of N2 coating

Fig. 5 Reconstructed cross section of N1 coating

Fig. 6 Thermal conductivity of N1 and N2 coatings

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等离子喷涂ZrO₂涂层显微结构表征和热导率分析

Microstructure Characterization and Thermal Conductivity Analysis of Plasma Sprayed ZrO₂ Coatings

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