等离子喷涂纳米Al2O3-13wt% TiO2涂层组织与性能的双态分布特性研究

doi:10.3724/SP.J.1077.2011.11135

无机材料学报 ›› 2011, Vol. 26 ›› Issue (9): 1003-1008.DOI: 10.3724/SP.J.1077.2011.11135

• 研究快报 • 上一篇

等离子喷涂纳米Al₂O₃-13wt% TiO₂涂层组织与性能的双态分布特性研究

路学成^1,2, 阎殿然¹, 杨勇¹, 何继宁¹, 张建新¹, 董艳春¹

(1. 河北工业大学河北省新型功能材料实验室, 天津 300130; 2. 军事交通学院装运机械系, 天津 300161)

收稿日期:2011-03-07 修回日期:2011-04-18 出版日期:2011-09-20 网络出版日期:2011-08-19
作者简介:LU Xue-Cheng (1978-), male, candidate of PhD. E-mail: luxuechengpla@yahoo.com.cn
基金资助:
National Natural Science Foundation of China (51072045); Key Lab for New Type of Functional Materials in Hebei Province

Bimodal Distribution of Microstructure and Mechanical Properties of Plasma Sprayed Nanostructured Al₂O₃-13wt% TiO₂ Coatings

LU Xue-Cheng^1,2, YAN Dian-Ran¹, YANG Yong¹, HE Ji-Ning¹, ZHANG Jian-Xin¹, DONG Yan-Chun¹

(1. Key Lab for new type of functional materials in Hebei Province, Hebei University of Technolgy, Tianjin 300130, China; 2. Handing Equipment Mechanical Department, Military Transportation University, Tianjing 300161, China)

Received:2011-03-07 Revised:2011-04-18 Published:2011-09-20 Online:2011-08-19
About author:LU Xue-Cheng (1978-), male, candidate of PhD. E-mail: luxuechengpla@yahoo.com.cn
Supported by:
National Natural Science Foundation of China (51072045); Key Lab for New Type of Functional Materials in Hebei Province

摘要/Abstract

摘要： 采用由喷雾造粒制备的纳米团聚粉末并通过等离子喷涂制备出纳米Al₂O₃-13wt% TiO₂涂层. 研究分析了涂层的相组成、显微结构、硬度及断裂韧性, 结果发现, 该纳米涂层呈现出由两部分不同区域组成的双态分布结构: 一部分为完全熔化后凝固形成的层状结构; 另一部分则为部分熔化的粒状结构, 其内保留来源于喷涂喂料的纳米或亚微米粒子. 涂层中与未熔纳米α-Al₂O₃粒子含量成比例的部分熔化区百分数可以通过调整关键喷涂工艺参数(CPSP)来控制. 纳米涂层所具有的这种混合结构特性, 可以被其力学性能的双态分布特征所证实。Weibull统计分析表明, 涂层的显微硬度和断裂韧性均呈现出双态分布, 部分熔化区的显微硬度及其分散性均比完全熔化区低, 而其断裂韧性及其分散性则均比完全熔化区高.

关键词: 等离子喷涂, 纳米涂层, 组织结构, 力学性能, 双态分布

Abstract: Nanostructured Al₂O₃-13wt% TiO₂ coatings were prepared by plasma spraying agglomerated nanocrystalline powders formed via spray drying method. The phase composition, microstructure, microhardness and fracture toughness of the coatings were investigated. It is found that the nanostructured coatings exhibited a unique bimodal microstructure consisting of two distinct regions: one of the regions is Fully Melted (FM) and solidified as lamellar structure, and the other is Partially Melted (PM) particulate microstructure with embedded nano or sub-micron particles retained from the starting powders. Furthermore, the percentage of PM region, which is proportional to unmelted α-Al₂O₃nanoparticles, in the coatings can be controlled by the critical plasma spray parameter. Such a characteristic of blended microstructure of the coatings is clearly confirmed from a bimodal distribution of their mechanical properties. The Weibull statistical analysis shows that the microhardness and fracture toughness of the coatings present a bimodal distribution, the mean value and the dispersity of microhardness of PM region are lower than those of FM region, but the mean value and the dispersity of fracture toughness of PM region are both higher than those of FM region.

Key words: plasma spraying, nanostructure coatings, microstructure, mechanical properties, bimodal distribution

中图分类号:

TB383
TG174

路学成, 阎殿然, 杨勇, 何继宁, 张建新, 董艳春. 等离子喷涂纳米Al₂O₃-13wt% TiO₂涂层组织与性能的双态分布特性研究[J]. 无机材料学报, 2011, 26(9): 1003-1008.

LU Xue-Cheng, YAN Dian-Ran, YANG Yong, HE Ji-Ning, ZHANG Jian-Xin, DONG Yan-Chun. Bimodal Distribution of Microstructure and Mechanical Properties of Plasma Sprayed Nanostructured Al₂O₃-13wt% TiO₂ Coatings[J]. Journal of Inorganic Materials, 2011, 26(9): 1003-1008.

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等离子喷涂纳米Al₂O₃-13wt% TiO₂涂层组织与性能的双态分布特性研究

Bimodal Distribution of Microstructure and Mechanical Properties of Plasma Sprayed Nanostructured Al₂O₃-13wt% TiO₂ Coatings

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