Effect of MoSi2 content on dielectric and mechanical properties of MoSi2/Al2O3 composite coatings

被引：15

作者：

Wu Zhi-hong ^{[1
]}

Zhou Wan-cheng ^{[1
]}

Luo Fa ^{[1
]}

Zhu Dong-mei ^{[1
]}

机构：

[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2012年 / 22卷 / 01期

基金：

中国国家自然科学基金;

关键词：

MoSi2/Al2O3 composite coating; atmospheric plasma spraying; mechanical properties; dielectric properties; ELECTROMAGNETIC SHIELDING PROPERTIES; CARBON; BEHAVIOR;

D O I：

10.1016/S1003-6326(11)61148-5

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Molybdenum disilicide (MoSi2) sheath and aluminum oxide (Al2O3) core blended powders were fabricated by spray drying. A derived coating material was produced for the application as microwave absorbers using the as prepared powders by atmospheric plasma spray (APS) technology. The effects of MoSi2/Al2O3 mass ratio on the dielectric and physical mechanical properties of the composite coatings were investigated. When the MoSi2 content of the composites increases from 0 to 45%, the flexure strength and fracture toughness improve from 198 to 324 MPa and 3.05 to 4.82 MPa.m(1/2) then decline to 310 MPa and 4.67 MPa.m(1/2), respectively. The dielectric loss tangent increases with increasing MoSi2 content, and the real part of permittivity decreases conversely over the frequency range of 8.2-12.4 GHz. These effects are due to the agglomeration of early molten MoSi2 particles and the increase of the electrical conductivity with increasing MoSi2 content.

引用

页码：111 / 116

页数：6

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