scholarly journals Investigation on the piezo-ceramic discoloration during the DC electrical degradation process

AIP Advances ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 065121
Author(s):  
Yi Zhang ◽  
De Yi Zheng ◽  
Chong Zhang ◽  
Shun Luo
Keyword(s):  
Degradation Process ◽  
Electrical Degradation

Electrical Degradation Induced Formations of Current Transients in Lead Zirconate Titanate

2012 ◽  
Vol 549 ◽  
pp. 707-710 ◽  
Author(s):  
De Yi Zheng ◽  
Jonathan Swingler ◽  
Paul Weaver ◽  
Qi Bin Liu
Keyword(s):  
Lead Zirconate Titanate ◽  
Electrical Breakdown ◽  
Piezoelectric Materials ◽  
Degradation Process ◽  
Lead Zirconate ◽  
Time Duration ◽  
Electrical Degradation ◽  
Burn Out ◽  
Resistance Decrease ◽  
Current Transients

Nowadays, the piezoelectric materials are widely used in many areas. The piezoelectric materials will undergo an electrical degradation process during working causes the piezoelectricity and resistance of the piezoelectric materials degrade. The existence of the electrical degradation phenomenon severely limits the applications of the piezoelectric products. During the electrical degradation process, electrical breakdown often occurs and this electrical breakdown has been proposed [1, 2] induces the resistance decrease and local phase changing. In this paper, the electrical breakdown induced current transients are detailed investigated. Three types of current transients are presented and the time durations of current transients are suggested not constant and corresponding to the time duration of the local burn-out process, which is caused by the heat released from the electrical breakdown process.

Self-Recovery and Re-Degradation Phenomena for PZT Ceramic

2013 ◽  
Vol 712-715 ◽  
pp. 131-134
Author(s):  
Min Luo ◽  
De Yi Zheng ◽  
Fei Huang
Keyword(s):  
Lead Zirconate Titanate ◽  
Piezoelectric Properties ◽  
Degradation Process ◽  
Lead Zirconate ◽  
The Self ◽  
Electrical Degradation ◽  
Ceramic Samples ◽  
Zirconate Titanate ◽  
Black Spots ◽  
Pzt Ceramic

Lead zirconate titanate (PZT) ceramic as a kind of widely used piezoelectric material is developing very fast for these years because of its high piezoelectric properties. Therefore, various theories have been developed for describing the mechanism of the degradation process of the PZT ceramic [1-4]. However, there are still many contentions in these reported theories. In this paper, experiments on commercially available lead zirconate titanate (PZT) ceramic samples have been designed. Through this work, it has been found that the leakage current is increasing with the electrical degradation process of the PZT ceramic. Self-recovery and re-degradation phenomena and formation of black spots have also been observed. It has suggested that the duration of the re-degradation process depends on the duration of the self-recovery and the re-degradation process would not produce any black spots and the black spots are only formed during electrical degradation process.

Stability of ZnO-Pr6O11-Cr2O3 Varistor Ceramics against Electrical Degradation

2016 ◽  
Vol 846 ◽  
pp. 115-125 ◽  
Author(s):  
Wan Rafizah Wan Abdullah ◽  
Azmi Zakaria ◽  
Mansor Hashim ◽  
Md Mahmudur Rahman ◽  
Mohd Sabri Mohd Ghazali
Keyword(s):  
Thermal Stresses ◽  
Nonlinear Coefficient ◽  
Degradation Process ◽  
Breakdown Field ◽  
Direct Response ◽  
Initial Value ◽  
Electrical Field ◽  
Nonlinear Properties ◽  
Electrical Degradation ◽  
The Stability

The vulnerability of varistor ceramics to electrical degradation during operation not only affects their nonlinear properties but also leads to shortening of device’s lifetime by increasing the risk of failures including melting, fire or even explosions. In this study, ZnO-Pr6O11-Cr2O3 varistor ceramics were prepared through modified citrate gel method and solid state-sintering at 1250 °C for 1 hour. The stability of their nonlinear properties under prolonged application of DC electrical field in high temperature ambient was investigated. Degradation process was accelerated by applying direct current (DC) electrical field of 15 % below the breakdown field point of ceramics for 54 hours consecutively at temperature of 30 to 125 °C. The findings indicate that ZnO-Pr6O11-Cr2O3 ceramics exhibited its susceptibility to electrical degradation after prolonged electrical and thermal stresses application. Its nonlinear coefficient has reduced by 4.4 % reduction, the breakdown field has reduced by 9.9 % and the leakage current density increased by 13.7 % in comparison to its initial value. Degradation process in varistor ceramics of ZnO-Pr6O11-Cr2O3 was a direct response to collapsed Double Schottky Barrier at ZnO grain boundary.

The Influence of Electrode Materials on the Electrical Degradation Process of Lead Zirconate Titanate under Harsh Operating Environment

2012 ◽  
Vol 535-537 ◽  
pp. 1507-1511 ◽  
Author(s):  
De Yi Zheng ◽  
Jonathan Swingler ◽  
Paul M. Weaver
Keyword(s):  
Lead Zirconate Titanate ◽  
Electrode Materials ◽  
Piezoelectric Materials ◽  
Life Time ◽  
Electrical Energy ◽  
Degradation Process ◽  
Lead Zirconate ◽  
Migration Ability ◽  
Electrical Degradation ◽  
Zirconate Titanate

Piezoelectric materials because their special ability to convert bwteen kinetic energy and electrical energy. Therefore, they are widely applicated in the areas such as sensors, resonators etc. However, the electrical degradation phenomenon of piezoelectric materials will cause the degradation of their performance. The electrode materails has been reported can severely influence the electrical degradation of piezoelectric materials. In this paper, the life time of the lead zirconate titanate capacitors with nickel, gold or silver electrodes are investigated. It is suggested that, the poor migration ability of the electrode elements gives the PZT capacitors a longer lifetime. The reason of no observation of the electrode materials in the capacitor material is also discussed.

Techniques For The Preparation of Tissue Samples Containing Injectable Polymer Microcapsules

1985 ◽  
Vol 43 ◽  
pp. 710-711
Author(s):  
G.E. Visscher ◽  
R. L. Robison ◽  
G. J. Argentieri
Keyword(s):  
Drug Delivery ◽  
Drug Delivery Systems ◽  
Gastrocnemius Muscle ◽  
Degradation Process ◽  
Delivery Systems ◽  
Tissue Reaction ◽  
Electron Microscopic ◽  
Tissue Samples ◽  
Injectable Polymer ◽  
Microscopic Techniques

The use of various bioerodable polymers as drug delivery systems has gained considerable interest in recent years. Among some of the shapes used as delivery systems are films, rods and microcapsules. The work presented here will deal with the techniques we have utilized for the analysis of the tissue reaction to and actual biodegradation of injectable microcapsules. This work has utilized light microscopic (LM), transmission (TEM) and scanning (SEM) electron microscopic techniques. The design of our studies has utilized methodology that would; 1. best characterize the actual degradation process without artifacts introduced by fixation procedures and 2. allow for reproducible results.In our studies, the gastrocnemius muscle of the rat was chosen as the injection site. Prior to the injection of microcapsules the skin above the sites was shaved and tattooed for later recognition and recovery. 1.0 cc syringes were loaded with the desired quantity of microcapsules and the vehicle (0.5% hydroxypropylmethycellulose) drawn up. The syringes were agitated to suspend the microcapsules in the injection vehicle.

Electrical Degradation and Breakdown in Polymers

IEE Review ◽  
1992 ◽  
Vol 38 (11-12) ◽  
pp. 404 ◽  
Author(s):  
W.G. Chadband
Keyword(s):  
Electrical Degradation

Effects of Sb, Zr, or Y addition on Electrical Degradation Characteristics of ZnO Varistors

2011 ◽  
Vol 131 (3) ◽  
pp. 219-224
Author(s):  
Takayuki Watanabe ◽  
Ai Fukumori ◽  
Yuji Akiyama ◽  
Masayuki Takada ◽  
Yuuki Sato ◽  
...  
Keyword(s):  
Electrical Degradation ◽  
Zno Varistors

Effects of Zr and Y Addition on the Electrical Degradation Characteristics of ZnO Varistors

2010 ◽  
Vol 130 (4) ◽  
pp. 394-402 ◽  
Author(s):  
Yuji Akiyama ◽  
Masayuki Takada ◽  
Ai Fukumori ◽  
Yuuki Sato ◽  
Shinzo Yoshikado
Keyword(s):  
Electrical Degradation ◽  
Zno Varistors
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