scholarly journals Construction of microgrooves on the surface of alumina ceramic insulator to enhance its flashover strength

AIP Advances ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 045009 ◽  
Author(s):  
Wenyuan Liu ◽  
Yuewen Guo ◽  
Yankun Huo ◽  
Changfeng Ke ◽  
Jun Cheng ◽  
...  
Keyword(s):  
Alumina Ceramic ◽  
Ceramic Insulator

Molecule self-assembly on alumina ceramic insulator to enhance its vacuum surface voltage withstand strength

2020 ◽  
Vol 127 (24) ◽  
pp. 243304
Author(s):  
Yankun Huo ◽  
Wenyuan Liu ◽  
Yuewen Guo ◽  
Changfeng Ke ◽  
Jun Cheng ◽  
...  
Keyword(s):  
Self Assembly ◽  
Alumina Ceramic ◽  
Ceramic Insulator

Effect of platinum metallization in cofired platinum / alumina microsystems for implantable medical applications

2013 ◽  
Vol 2013 (CICMT) ◽  
pp. 000177-000182
Author(s):  
Ali Karbasi ◽  
Ali Hadjikhani ◽  
W. Kinzy Jones
Keyword(s):  
Implantable Devices ◽  
Alumina Ceramic ◽  
Ceramic Technology ◽  
Medical Applications ◽  
Densification Rate ◽  
Material Combination ◽  
Final Assembly ◽  
Ceramic Insulator ◽  
Multilayer Ceramic ◽  
Neural Stimulator

Typically, hermetic feedthroughs for implantable devices, such as pacemakers, use an alumina ceramic insulator brazed to a platinum wire pin. This material combination has a long history in implantable devices and is the desired structure due to the acceptance by the FDA for implantable hermetic feedthroughs. The growing demand for increased input/output (I/O) hermetic feedthroughs for implantable neural stimulator applications can be addresses by developing a new, co-fired platinum/alumina multilayer ceramic technology in a configuration that supports 300 plus I/Os, which is not commercially available. Different densification rate of platinum and alumina is the major issue in developing a high-density feedthrough. This difference in densification rate could create delamination and crack in feedthrough structure and decrease the reliability and degree of the hermeticty of the final assembly. In this paper different metallization were evaluated to minimize this difference. Additionaly the firing atmosphere and the firing profiles were evaluated to minimize this difference. FIB nano-machining and SEM with EDS were used for the analysis of these conditions.

Porous Alumina Ceramic Prepared by HEMA-TBA Gelcasting System

2017 ◽  
Vol 32 (7) ◽  
pp. 731 ◽  
Author(s):  
XIE Yu-Zhou ◽  
PENG Chao-Qun ◽  
WANG Xiao-Feng ◽  
WANG Ri-Chu ◽  
LUO Feng
Keyword(s):  
Porous Alumina ◽  
Alumina Ceramic

Damage of aluminum samples with alumina ceramic coating under pulsed energy flows of various nature

2018 ◽  
pp. 15-27 ◽  
Author(s):  
V. A. Gribkov ◽  
◽  
A. S. Demin ◽  
N. A. Epifanov ◽  
E. E. Kazilin ◽  
...  
Keyword(s):  
Ceramic Coating ◽  
Alumina Ceramic ◽  
Energy Flows

scholarly journals Effects of Flash Sintering Parameters on Performance of Ceramic Insulator

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1157
Author(s):  
Yong Liu ◽  
Xingwang Huang
Keyword(s):  
Grain Size ◽  
Electric Field ◽  
Field Intensity ◽  
Current Density ◽  
Electric Field Intensity ◽  
Unit Cell ◽  
Uniform Structure ◽  
Ceramic Insulator ◽  
Flash Sintering ◽  
Ceramic Insulators

Ceramic outdoor insulators play an important role in electrical insulation and mechanical support because of good chemical and thermal stability, which have been widely used in power systems. However, the brittleness and surface discharge of ceramic material greatly limit the application of ceramic insulators. From the perspective of sintering technology, flash sintering technology is used to improve the performance of ceramic insulators. In this paper, the simulation model of producing the ceramic insulator by the flash sintering technology was set up. Material Studio was used to study the influence of electric field intensity and temperature on the alumina unit cell. COMSOL was used to study the influence of electric field intensity and current density on sintering speed, density and grain size. Obtained results showed that under high temperature and high voltage, the volume of the unit cell becomes smaller and the atoms are arranged more closely. The increase of current density can result in higher ceramic density and larger grain size. With the electric field intensity increasing, incubation time shows a decreasing tendency and energy consumption is reduced. Ceramic insulators with a higher uniform structure and a smaller grain size can show better dielectric performance and higher flashover voltage.

High‐Quality Translucent Alumina Ceramic Through Digital Light Processing Stereolithography Method

2021 ◽  
pp. 2001475
Author(s):  
Ying Sun ◽  
Ming Li ◽  
Yanlin Jiang ◽  
Bohang Xing ◽  
Minhao Shen ◽  
...  
Keyword(s):  
Alumina Ceramic ◽  
High Quality ◽  
Digital Light Processing

scholarly journals Development of a New Finishing Process Combining a Fixed Abrasive Polishing with Magnetic Abrasive Finishing Process

Machines ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 81
Author(s):  
Yanhua Zou ◽  
Ryunosuke Satou ◽  
Ozora Yamazaki ◽  
Huijun Xie
Keyword(s):  
Alumina Ceramic ◽  
Ceramic Plate ◽  
Polishing Process ◽  
High Quality ◽  
Influence Of Process Parameters ◽  
Magnetic Abrasive Finishing ◽  
Nano Scale ◽  
Finishing Process ◽  
Abrasive Finishing ◽  
Fixed Abrasive

High quality, highly efficient finishing processes are required for finishing difficult-to-machine materials. Magnetic abrasive finishing (MAF) process is a finishing method that can obtain a high accuracy surface using fine magnetic particles and abrasive particles, but has poor finishing efficiency. On the contrary, fixed abrasive polishing (FAP) is a polishing process can obtain high material removal efficiency but often cannot provide a high-quality surface at the nano-scale. Therefore, this work proposes a new finishing process, which combines the magnetic abrasive finishing process and the fixed abrasive polishing process (MAF-FAP). To verify the proposed methodology, a finishing device was developed and finishing experiments on alumina ceramic plates were performed. Furthermore, the mechanism of the MAF-FAP process was investigated. In addition, the influence of process parameters on finishing characteristics is discussed. According to the experimental results, this process can achieve high-efficiency finishing of brittle hard materials (alumina ceramics) and can obtain nano-scale surfaces. The surface roughness of the alumina ceramic plate is improved from 202.11 nm Ra to 3.67 nm Ra within 30 min.

scholarly journals Performance of oxalic acid-chitosan/alumina ceramic biocomposite for the adsorption of a reactive anionic azo dye

2021 ◽  
Author(s):  
John Pérez-Calderón ◽  
Alberto Scian ◽  
Martin Ducos ◽  
Victoria Santos ◽  
Noemí Zaritzky
Keyword(s):  
Oxalic Acid ◽  
Azo Dye ◽  
Alumina Ceramic
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