The effects of mechanical activation on the sintering of mullite produced from kaolin and aluminum powder

被引:44
|
作者
Sahraoui, T. [1 ,2 ]
Belhouchet, H. [1 ,3 ]
Heraiz, M. [3 ]
Brihi, N. [2 ]
Guermat, A. [4 ]
机构
[1] Univ Ferhat Abbas Setif 1, Inst Opt & Precis Mech, Non Metall Mat Lab, Setif 19000, Algeria
[2] Jijel Univ, Dept Phys, Lab Mat Study, Fac Sci, BP 98, Ouled Aissa 18000, Jijel, Algeria
[3] Univ Mohamed Boudiaf Msila, Dept Phys, Fac Sci, Msila 280004, Algeria
[4] Univ Ferhat Abbas Setif 1, Inst Opt & Precis Mech, Appl Opt Lab, Setif 19000, Algeria
关键词
Kaolin (DD3); Mechanical activation; Aluminum oxidation; Reaction-sintering; Mullite; PHASE-TRANSFORMATION SEQUENCE; NEUTRON-DIFFRACTION; BEHAVIOR; CERAMICS; KINETICS; MIXTURES; SUPPORTS; LIME; CLAY; XRD;
D O I
10.1016/j.ceramint.2016.04.157
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
In this work, the effects of mechanical activation on the sintering of mullite produced from kaolin and aluminum metal powder was investigated. Because of the higher content of silica in kaolin it is necessary to add alumina or aluminum oxide in order to obtain the stoichiometric mullite composition. After mechanical treatment for different milling time, the reactions and phase transformations between kaolin and aluminum metal powder were studied using thermal techniques (DTA/TG), X-ray diffraction (XRD) and infrared spectroscopy (FT-IR). The heated samples at different temperatures were studied by XRD, apparent density, open porosity measurements and SEM analysis. The results showed the formation of silicon, quartz and small amount of nacrite after 40 h of milling at room temperature. All mixture powders milled for different time showed the formation of several alumina transitions during heat treatment. The formation of alumina transitions, a-alumina, cristobalite crystallization of and mullite (primary and secondary) formation was affected by ball milling time. The mixture of kaolin and aluminum milled for 40 h show the formation of kyanite (Al2SiO5) at 1300 degrees C. The mechanical treatment enhances the formation and sintering of mullite. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
引用
收藏
页码:12185 / 12193
页数:9
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