Effects of chromium doping on the insulator properties in vacuum of alumina

Xiang Long Liu; Xiao Yun Li; Jian Yang; Tai Qiu

Effects of chromium doping on the insulator properties in vacuum of alumina

Xiang Long Liu, Xiao Yun Li, Jian Yang, Tai Qiu

College of Materials Science and Engineering

Nanjing Tech University

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

Surface flashover phenomena greatly restricts the application of insulating materials under high-voltage in vacuum. Ceramic insulators were prepared with 95wt% alumina powders, doping content of Cr₂O₃ ranging from 0 to 1.5wt%. The effects of Cr₂O₃ content on the sintering and insulation properties were investigated. The results show that chromium doping significantly reduced the porosity and the sintering temperature, and improved the property of sintering, therefore Cr-doping alumina ceramic obtained fine-grained microstructure. As the Cr₂O₃ doping content is 0.5wt%, the ceramic surface flashover voltage in vacuum reached 65 kV/cm, mainly because Cr-doping decreased the porosity and secondary electron emission coefficient of samples. Over-doping of Cr₂O₃ caused more defects of crystal structure, which reduced the withstand voltage of the ceramic insulator in vacuum instead.

Original language	English
Pages (from-to)	857-861
Number of pages	5
Journal	Rengong Jingti Xuebao/Journal of Synthetic Crystals
Volume	43
Issue number	4
State	Published - Apr 2014

Keywords

Alumina ceramic
Chromium oxide
Surface flashover

Cite this

@article{45a38013c41241789264810cd13aa337,

title = "Effects of chromium doping on the insulator properties in vacuum of alumina",

abstract = "Surface flashover phenomena greatly restricts the application of insulating materials under high-voltage in vacuum. Ceramic insulators were prepared with 95wt% alumina powders, doping content of Cr2O3 ranging from 0 to 1.5wt%. The effects of Cr2O3 content on the sintering and insulation properties were investigated. The results show that chromium doping significantly reduced the porosity and the sintering temperature, and improved the property of sintering, therefore Cr-doping alumina ceramic obtained fine-grained microstructure. As the Cr2O3 doping content is 0.5wt%, the ceramic surface flashover voltage in vacuum reached 65 kV/cm, mainly because Cr-doping decreased the porosity and secondary electron emission coefficient of samples. Over-doping of Cr2O3 caused more defects of crystal structure, which reduced the withstand voltage of the ceramic insulator in vacuum instead.",

keywords = "Alumina ceramic, Chromium oxide, Surface flashover",

author = "Liu, {Xiang Long} and Li, {Xiao Yun} and Jian Yang and Tai Qiu",

year = "2014",

month = apr,

language = "英语",

volume = "43",

pages = "857--861",

journal = "Rengong Jingti Xuebao/Journal of Synthetic Crystals",

issn = "1000-985X",

publisher = "Chinese Ceramic Society",

number = "4",

}

TY - JOUR

T1 - Effects of chromium doping on the insulator properties in vacuum of alumina

AU - Liu, Xiang Long

AU - Li, Xiao Yun

AU - Yang, Jian

AU - Qiu, Tai

PY - 2014/4

Y1 - 2014/4

N2 - Surface flashover phenomena greatly restricts the application of insulating materials under high-voltage in vacuum. Ceramic insulators were prepared with 95wt% alumina powders, doping content of Cr2O3 ranging from 0 to 1.5wt%. The effects of Cr2O3 content on the sintering and insulation properties were investigated. The results show that chromium doping significantly reduced the porosity and the sintering temperature, and improved the property of sintering, therefore Cr-doping alumina ceramic obtained fine-grained microstructure. As the Cr2O3 doping content is 0.5wt%, the ceramic surface flashover voltage in vacuum reached 65 kV/cm, mainly because Cr-doping decreased the porosity and secondary electron emission coefficient of samples. Over-doping of Cr2O3 caused more defects of crystal structure, which reduced the withstand voltage of the ceramic insulator in vacuum instead.

AB - Surface flashover phenomena greatly restricts the application of insulating materials under high-voltage in vacuum. Ceramic insulators were prepared with 95wt% alumina powders, doping content of Cr2O3 ranging from 0 to 1.5wt%. The effects of Cr2O3 content on the sintering and insulation properties were investigated. The results show that chromium doping significantly reduced the porosity and the sintering temperature, and improved the property of sintering, therefore Cr-doping alumina ceramic obtained fine-grained microstructure. As the Cr2O3 doping content is 0.5wt%, the ceramic surface flashover voltage in vacuum reached 65 kV/cm, mainly because Cr-doping decreased the porosity and secondary electron emission coefficient of samples. Over-doping of Cr2O3 caused more defects of crystal structure, which reduced the withstand voltage of the ceramic insulator in vacuum instead.

KW - Alumina ceramic

KW - Chromium oxide

KW - Surface flashover

UR - http://www.scopus.com/inward/record.url?scp=84901598148&partnerID=8YFLogxK

M3 - 文章

AN - SCOPUS:84901598148

SN - 1000-985X

VL - 43

SP - 857

EP - 861

JO - Rengong Jingti Xuebao/Journal of Synthetic Crystals

JF - Rengong Jingti Xuebao/Journal of Synthetic Crystals

IS - 4

ER -

Effects of chromium doping on the insulator properties in vacuum of alumina

Abstract

Keywords

Other files and links

Fingerprint

Cite this