Chap 13 Solns-6E - boundaries become tangent this...

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CHAPTER 13 APPLICATIONS AND PROCESSING OF CERAMICS PROBLEM SOLUTIONS 13.5 (a) From Figure 12.25, the maximum temperature without a liquid phase corresponds to the temperature at the MgO(ss)-[MgO(ss) + Liquid] boundary at this composition, which is approximately 2240 ° C (4060 ° F). (b) This maximum temperature lies at the phase boundary between MgAl 2 O 4 (ss)-(MgAl 2 O 4 + Liquid) phase fields (just slightly to the right of the congruent melting point at which the two phase
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Unformatted text preview: boundaries become tangent); this temperature is approximately 2090 ° C (3790 ° F). 13.14 The annealing point is that temperature at which the viscosity of the glass is 10 12 Pa-s (10 13 P). From Figure 13.6, these temperatures for the several glasses are as follows: Glass Annealing Temperature Soda-lime 500 ° C (930 ° F) Borosilicate 570 ° C (1060 ° F) 96% Silica 930 ° C (1705 ° F) Fused Silica 1170 ° C (2140 ° F) 98...
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