采用大气等离子喷涂技术在铜基体上沉积了Al2O3涂层.采用XRD和SEM对涂层微观结构进行了表征.通过探讨孔隙率和吸潮行为对绝缘性能的影响,分析了等离子喷涂Al2O3涂层结构与电绝缘失效机理的关系.结果表明:等离子喷涂Al2O3涂层较致密,界面结合较好.随涂层厚度不同其孔隙率在5％～7％范围变化.等离子喷涂Al2O3涂层结构中的孔洞是电绝缘失效的主要部位且呈典型电晕击穿形貌.电晕击穿诱发的裂纹沿击穿方向扩展形成击穿隧道.击穿方向与电极极性无关而由击穿孔洞位置决定.涂层厚度与涂层击穿强度呈现倒数关系.吸潮会诱发导电通路形成降低Al2O3涂层抗击穿能力.
参考文献
| [1] | AHMED A S I;KABSY J;ZARBOUT K et al.Microstructural origin of the dielectric breakdown strength in alumina:A study by positron lifetime spectroscopy[J].Journal of the European Ceramic Society,2005,25:2813-2816. |
| [2] | L. Haddour;N. Mesrati;D. Goeuriot .Relationships between microstructure, mechanical and dielectric properties of different alumina materials[J].Journal of the European Ceramic Society,2009(13):2747-2756. |
| [3] | David Malec;Vincent Bley;Fatiha Talbi;Fadila Lalam .Contribution to the understanding of the relationship between mechanical and dielectric strengths of Alumina[J].Journal of the European Ceramic Society,2010(15):3117-3123. |
| [4] | M. Touzin;D. Goeuriot;C. Guerret-Piecourt .Alumina based ceramics for high-voltage insulation[J].Journal of the European Ceramic Society,2010(4):805-817. |
| [5] | J. Liebault;J. Vallayer;D. Goeuriot .How the trapping of charges can explain the dielectric breakdown performance of alumina ceramics[J].Journal of the European Ceramic Society,2001(3):389-397. |
| [6] | Schneider, G.A. .A Griffith type energy release rate model for dielectric breakdown under space charge limited conductivity[J].Journal of the Mechanics and Physics of Solids,2013(1):78-90. |
| [7] | CTIBOR P;SEDLZCEK J;NEUFUSS K .Influence of chemical composition on dielectric properties of Al2O3 and ZrO2 plasma deposits[J].Ceramics International,2003,29:527-532. |
| [8] | Filofteia-Laura Toma;Stefan Scheitz;Lutz-Michael Berger;Viktar Sauchuk;Mihails Kusnezoff;Sven Thiele .Comparative Study of the Electrical Properties and Characteristics of Thermally Sprayed Alumina and Spinel Coatings[J].Journal of Thermal Spray Technology,2011(1/2):195-204. |
| [9] | R. Venkataraman;G. Das;S. R. Singh;L. C. Pathak;R. N. Ghosh;B. Venkataraman;R. Krishnamurthy .Study on influence of porosity, pore size, spatial and topological distribution of pores on microhardness of as plasma sprayed ceramic coatings[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2007(1/2):269-274. |
| [10] | Zhijian Yin;Shunyan Tao;Xiaming Zhou .Effect of the thickness on properties of Al_2O_3 coatings deposited by plasma spraying[J].Materials Characterization,2011(1):90-93. |
| [11] | Carl Christoph Stahr;Sabine Saaro;Lutz-Michael Berger;Jiri Dubsky;Karel Neufuss;Mathias Herrmann .Dependence of the Stabilization of α-Alumina on the Spray Process[J].Journal of Thermal Spray Technology,2007(5/6):822-830. |
| [12] | 许金泉.材料强度学[M].上海:上海交通大学出版社,2009:36-40. |
| [13] | YOSHIMU R;BOWEN H .Electrical breakdown strength of alumina at high temperature[J].Journal of the American Ceramic Society,1981,64(07):404-410. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%