Microstructure and Electrical Properties of ZnO–Bi2O3-Based Varistor Ceramics by Different High-Energy Ball Milling Time

2012 ◽  
Vol 490-495 ◽  
pp. 3391-3395
Author(s):  
Cheng Hua Zhang ◽  
Ming Shuang Li ◽  
Dong Xu ◽  
Yong Fang Chen ◽  
Yuan Ling Liu ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Ball Milling ◽  
Leakage Current ◽  
Threshold Voltage ◽  
Nonlinear Coefficient ◽  
High Energy ◽  
Sem Analysis ◽  
High Energy Ball Milling ◽  
Electrical Measurements ◽  
Energy Ball

The microstructure and electrical properties of ZnO-Bi2O3-based varistor ceramics prepared by the high-energy ball milling were studied. The varistor ceramics samples were characterized by XRD and SEM analysis, as well as by dc electrical measurements, such as the nonlinearity coefficients, leakage current and threshold voltage. The best electrical characteristics were found in sample by the high-energy ball milling 1 h and sintered at 1000 °C for 2 h, which exhibited the threshold voltage was 457 V/mm, the nonlinear coefficient was 59.3 and the leakage current was 1.18 μA.

Electrical properties and microstructure of Y-doped BaTiO3 ceramics prepared by high-energy ball-milling

2008 ◽  
Vol 34 (7) ◽  
pp. 1573-1577 ◽  
Author(s):  
K. Park ◽  
J.-G. Kim ◽  
K.-J. Lee ◽  
W.S. Cho ◽  
W.S. Hwang
Keyword(s):  
Electrical Properties ◽  
Ball Milling ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Energy Ball

Al/Al2O3 Nanocomposite Produced by ECAP

2013 ◽  
Vol 762 ◽  
pp. 457-464 ◽  
Author(s):  
Riccardo Casati ◽  
Matteo Amadio ◽  
Carlo Alberto Biffi ◽  
David Dellasega ◽  
Ausonio Tuissi ◽  
...  
Keyword(s):  
Ball Milling ◽  
Metal Matrix ◽  
Numerical Models ◽  
High Energy ◽  
Sem Analysis ◽  
High Energy Ball Milling ◽  
Composite Powders ◽  
Metal Matrix Nanocomposites ◽  
Angular Pressing ◽  
Energy Ball

Metal matrix nanocomposites have been produced by powder metallurgy route. Al and nanoAl2O3powders were grinded through high energy ball milling. Then, the composite powders were sintered by Equal Channel Angular Pressing (ECAP). 12 ECAP passes were carried out in order to improve the dispersion of the hard particles. SEM analysis was performed to investigate the distribution of the ceramic nanoparticles within the matrix. Hardness tests were executed to evaluate the mechanical behavior of the nanocomposites. Finally, mechanical strength values obtained by numerical models were compared with those estimated from hardness measurements. High energy ball milling followed by ECAP process revealed to be a suitable route for the production of metal matrix composites reinforced with well dispersed nanoparticles.

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