Time filter

Source Type

Meng Y.,Chinese Academy of science | Meng Y.,University of Chinese Academy of Sciences | Gong G.,Chinese Academy of science | Wei D.,Chinese Academy of science | And 2 more authors.
Applied Clay Science | Year: 2016

The high strength aluminous porcelain insulator with a mineral composition of kaolinite, corundum, microcline, quartz, small amounts of albite and anatase was investigated by in situ high temperature XRD (HTXRD) from 25. °C to 1300. °C. The amount change and reaction of minerals contained in the porcelain insulator were presented vividly. The full process occurred in successive stages: 1) kaolinite decomposed into amorphous metakaolinite in the temperature range of 500-600. °C; 2) metakaolinite kept amorphous form up to about 1000. °C; 3) at about 1000. °C, amorphous metakaolinite generated primary mullite; 4) after bout 1200. °C, microcline began to melt, forming an alkaline liquid phase which facilitated the growth of primary mullite into secondary mullite; 5) the alkaline liquid phase could etch β-quartz, resulting in the reflection intensity of β-quartz decreasing; 6) corundum was very stable in the whole heating process. © 2016.

Meng Y.,University of Chinese Academy of Sciences | Meng Y.,Chinese Academy of science | Gong G.,Chinese Academy of science | Wu Z.,Bijie Highland Porcelain Insulator Ltd Liability Company | And 3 more authors.
Journal of the European Ceramic Society | Year: 2012

Insulators are essential components of power transmission network. With natural minerals such as bauxite and clay, we have fabricated ultra-high-strength porcelain insulator (UHSPI) of electromechanical failure load 420. kN determined by International Electrotechnical Commission (IEC), and have put it into production. Compared with other UHSPI fabricating methods, in which industrial alumina is used, our method is cost saving and rich in resources. The main objective of the study is to elucidate the relationship between microstructure (e.g. size, amounts and distribution of particles) and mechanical property of the sintered UHSPI and thereby to explore a way to further improve the mechanical property of UHSPI. The investigations of SEM, EDAX and XRD reveal that the strengthening mechanisms may be the combination of matrix reinforcement, mullite reinforcement and dispersion strengthening; high porosity (9.9%) and abnormal pores are more possible to be the main factor hindering electromechanical property improvement. © 2012 Elsevier Ltd.

Meng Y.,University of Chinese Academy of Sciences | Meng Y.,Chinese Academy of science | Gong G.,Chinese Academy of science | Wei D.,University of Chinese Academy of Sciences | And 3 more authors.
Ceramics International | Year: 2014

The property of insulators is closely related to microstructures. In order to study the difference and similarity of two kinds of insulators microstructure and thereby explore ways to improve the property of insulators further, a comparative study was carried out on three high strength porcelain insulators by XRD, SEM and ceramography. The results indicate that there exists a negative linear relationship between the porosity and the content of amorphous phase. Porosity is the main factor affecting the density of insulator body. Compared with alumina, the calcined bauxite used as raw material will cause the increase of porosity. Microcracks usually appear in vitrified area and area around quartz particle where mullite is rare, crack is obvious. Decreasing the amount of quartz in raw material and increasing the amount of mullite in vitrified area could improve the mechanical strength of porcelain insulators further. © 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

Discover hidden collaborations