轴向送粉等离子喷涂Ni/Al2O3涂层的力学及微波介电性能

doi:10.3724/SP.J.1077.2011.01063

无机材料学报 ›› 2011, Vol. 26 ›› Issue (10): 1063-1067.DOI: 10.3724/SP.J.1077.2011.01063

轴向送粉等离子喷涂Ni/Al₂O₃涂层的力学及微波介电性能

武志红, 周万城, 罗发, 朱冬梅

(西北工业大学凝固技术国家重点实验室, 西安 710072)

收稿日期:2010-12-08 修回日期:2011-02-22 出版日期:2011-10-20 网络出版日期:2011-09-20
作者简介:武志红(1974-), 男, 博士研究生. E-mail: wuzhihong@msn.com
基金资助:
国家自然科学基金(51072165); 凝固技术国家重点实验室(西北工业大学)自主研究项目( KP200901)

Mechanical and Dielectric Properties of Ni/Al₂O₃ Composite Coatings Prepared by the Axial Plasma Spraying

WU Zhi-Hong, ZHOU Wan-Cheng, LUO Fa, ZHU Dong-Mei

(State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China)

Received:2010-12-08 Revised:2011-02-22 Published:2011-10-20 Online:2011-09-20
Supported by:
National Natural Science Foundation of China (51072165); Fund of the State Key Laboratory of Solidification Processing in NWPU (KP200901)

摘要/Abstract

摘要： 以轴向送粉等离子喷涂法制备了Ni/Al₂O₃陶瓷涂层, 分析了Ni含量变化对涂层材料的显微结构、力学性能及微波介电性能的影响. 结果表明, 随着Ni含量增加, 涂层中Ni粒子的分布逐渐由孤立向部分桥连方式转变; 陶瓷涂层的相对密度、抗弯强度呈下降趋势, 这主要是由于在陶瓷涂层中Ni与Al₂O₃不润湿, Ni与Al₂O₃热膨胀系数不匹配从而形成空隙引起的. 涂层断裂韧性随Ni含量的增加而升高, 则是由于材料中Ni粒子发生了延展变形和引起裂纹转向. 复介电常数性能测试结果表明, 在8.2~12.4GHz 微波频率范围内, 陶瓷涂层复介电常数的实部值随Ni粒子含量的增加先逐渐上升后逐渐下降, 复介电常数的虚部上升. 这与Ni粒子形成的桥连结构有关.

关键词: Ni/Al₂O₃涂层, 等离子喷涂, 介电性能, 力学性能

Abstract: The nickel-alumina composite coatings were fabricated by the axial plasma spraying method. The effects of the different content of Ni on the microscopic structure, mechanical and dielectric properties of the composite coatings were investigated. The results indicate that with the increase of nickel content, the distribution of Ni particles changes from separated to large but finite interconnected clusters. The relative density and the bending strength decrease gradually, which is attributed to thermal expansion mismatch and non-wettability between alumina and nickel. The increase in the fracture toughness is caused by the Ni particles’ extension and deflection of the crack. The complex dielectric constant measurements indicate that the real part shows an increase and then decline trend with the Ni content in the frequency of 8.2-12.4GHz, while the imaginary part continues increasing. This is ascribed to the bridge structure of Ni particles.

Key words: coatings of Ni/Al₂O₃, axial plasma spraying, mechanical properties, dielectric properties

中图分类号:

TB333

武志红, 周万城, 罗发, 朱冬梅. 轴向送粉等离子喷涂Ni/Al₂O₃涂层的力学及微波介电性能[J]. 无机材料学报, 2011, 26(10): 1063-1067.

WU Zhi-Hong, ZHOU Wan-Cheng, LUO Fa, ZHU Dong-Mei. Mechanical and Dielectric Properties of Ni/Al₂O₃ Composite Coatings Prepared by the Axial Plasma Spraying[J]. Journal of Inorganic Materials, 2011, 26(10): 1063-1067.

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轴向送粉等离子喷涂Ni/Al₂O₃涂层的力学及微波介电性能

Mechanical and Dielectric Properties of Ni/Al₂O₃ Composite Coatings Prepared by the Axial Plasma Spraying

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