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Xu N.,Wuhan University of Science and Technology | Li S.,Wuhan University of Science and Technology | Li S.,Anhui Ruital New Material Technology Co. | Li Y.,Wuhan University of Science and Technology | And 4 more authors.
Ceramics International | Year: 2015

In this paper, porous ceramic aggregates were prepared by electrical insulators waste (EIW). Effects of sintering temperature and content of EIW on the aggregates' properties such as bulk density, and apparent porosity, total porosity, and cold crushing strength were investigated. With increasing sintering temperature and content of EIW, bulk density and cold crushing strength of the aggregates increased, apparent porosity and total porosity decreased. Based on these results, total porosity of specimens in group B sintered at 1200 °C is 62.0%, cold crushing strength is 35.3 N, and thermal conductivity is 0.165 W/(m K) at 300 °C. Comprehensive properties of specimens can be optimized by adjusting sintering temperature. Meanwhile, strength variation resulted from the combined effects of phase transformation and matrix densification under different sintering temperatures. © 2015 Elsevier Ltd and Techna Group S.r.l. Source


Xu N.N.,Wuhan University of Science and Technology | Li S.J.,Wuhan University of Science and Technology | Li S.J.,Anhui Ruital New Material Technology Co. | Li Y.B.,Wuhan University of Science and Technology | And 4 more authors.
Advances in Applied Ceramics | Year: 2015

High voltage insulator waste (HVIW) eliminated from high voltage transmission lines was used in the preparation of porous mullite ceramics. The fabrication and characterisation of porous mullite ceramics are described. The relationship between phase transitions, sintering temperature and physicochemical properties of the porous mullite ceramics are analysed and compared. The results show that the complex properties are the best when the mass ratio of HVIW/clay is 4 : 1, the amount of pore former is 500 mL kg-1 and the sintering temperature is 1500°C, the cold crushing strength reaches 4·8 MPa. Increasing the sintering temperature could strengthen the specimens. The average pore diameter of the specimens enlarged with the increasing sintering temperature. Meanwhile, the crystalline and morphology of mullite grains advanced and the maximum grain diameter reached to 1·5 μm. This improvement was attributed to the fact that complex properties of specimens could be optimised by new formation of new mullite phase. © 2015 Institute of Materials, Minerals and Mining Source

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