Ceramic and Glass Materials
2 Mullite 29 to 3:2 mullite, and x = 0.4 corresponds to 2:1 mullite. Diffusion studies [3] have shown that the following chemica ...
30 D.J. Duval et al. Al 2 O 3 content. Figure 1 depicts the mullite unit. Atom positions for an intermediate composition of mull ...
2 Mullite 31 Mullite-based ceramics have been widely used as refractories and in pottery for millennia. Although the technology ...
32 D.J. Duval et al. The 2:1 mullite appears to be only metastable at room temperature [28], and very high temperature use or cy ...
2 Mullite 33 approximate alumina-to-silica molar ratio of 3:2. The order of reaction proceeds as follows [30]: Al 2 Si 2 O 5 (OH ...
34 D.J. Duval et al. High-purity glass-free mullite monoliths have been obtained by at least three tradi- tional methods: Start ...
2 Mullite 35 a type II gel would be a mixture of boehmite with a TEOS or TMOS sol [22]. Type III diphasic gels contain precursor ...
36 D.J. Duval et al. gels at the interface between Si-rich and Al-rich microdomains. MacKenzie et al. attribute this Al signal t ...
2 Mullite 37 decreases with alumina content, and the anisotropy of thermal expansion is reduced simultaneously [51]. Given that ...
38 D.J. Duval et al. D.J. Cassidy, J.L. Woolfrey, and J.R. Bartlett, The effect of precursor chemistry on the crystallisation a ...
2 Mullite 39 R.G. Chandran and K.C. Patil, A Rapid combustion process for the preparation of crystalline mullite powders, Mater ...
J.F. Shackelford and R.H. Doremus (eds.), Ceramic and Glass Materials: 41 Structure, Properties and Processing. © Springer 2008 ...
42 R.C. Bradt TheP–T diagram of the three sillimanite minerals is presented in Fig. 1. This P–T diagram for the Al 2 SiO 5 compo ...
3 The Sillimanite Minerals: Andalusite, Kyanite, and Sillimanite 43 their most distinguishing feature is the systematic change o ...
44 R.C. Bradt the coordination of the Al3+ cations that characterizes the structural differences. In andalusite, which is also o ...
3 The Sillimanite Minerals: Andalusite, Kyanite, and Sillimanite 45 decomposition product is cristobalite, while for andalusite ...
46 R.C. Bradt are considered. Mullite, the major product, has a density of about 3.2 Mg m−3, similar to that of andalusite. Thus ...
3 The Sillimanite Minerals: Andalusite, Kyanite, and Sillimanite 47 beach sands of several locales. The Assam deposits in India ...
48 R.C. Bradt References L.L.Y. Chang, Sillimanite, Andalusite, and Kyanite, in Industrial Mineralogy, Prentice-Hall, Upper Sad ...
J.F. Shackelford and R.H. Doremus (eds.), Ceramic and Glass Materials: 49 Structure, Properties and Processing. © Springer 2008 ...
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