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How long will it take to convert 50% to mullite at 1400°C and at 1500%C? How will you determine that 50% has indeed been converted?
What orientation will you choose to produce the fast reaction when you heat these to 1400°C for 1 hour?
You react two samples of alumina and magnesia at 1400°C for 1 hour. This time the MgO is a perfect single crystal but the alumina is 100-nm grain
Describe how cords and stones could be removed. How much glass in your area is recycled as cullet?
Why is tin used in the float glass process? We process the glass to remove bubbles and thus avoid stresses in the glass.
Why has the art of glass produced so much new interest? Is it new? Discuss.
What would be the usual amounts (in wt%) of each of the ingredients in a typical tape cast formulation?
Explain why shrinkage of a cast tape occurs during drying and firing. Which of the ingredients in the above formulation
In glass formulations used in thick-film inks alkali metal constituents are avoided. Why?
Why do you think these constituents are added to the alumina and what effect, if any
Explain the reasoning for your answer. Who are the major vendors for thick-film materials?
Explain briefly the differences between jet milling, vibratory milling, and agitated ball milling.
What is the difference between a particulate gel and a polymeric gel? What would be appropriate starting chemicals for producing YBa2Cu3O7 films by sol-gel?
Explain why 29Si NMR can be used to study the amorphous-to-crystalline transition in a silica gel.
Compare the raw materials costs of preparing PZT powders by conventional solid-state reactions and sol-gel processing.
Compare this process to that occurring during sol-gel processing of ceramics using metal alkoxides.
Briefly describe the differences between hot pressing and cold pressing.
Why are graphite dies widely used for hot pressing? Under what conditions would the use of graphite not be appropriate?
Which method would you choose to form each of the following shapes; briefly justify your choice.
If the experiment were repeated at 1600°C, how would these results change?
What are the different forms of commercially available fiber that contain mainly alumina and silica?
Determining the relative amount of whiskers in the composite and also the composition of the whiskers and matrix phases?
Compare the material costs involved in making a BN-reinforced Al2O3 CMC composite by (a) combining the individual constituents
Compare the use of scattering of visible light and that of X-rays to determine particle size distributions.