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humorist-workshop
ceramics
in ceramics in school, were designing pots. i was thinking of things i could put on my pot, and i asked my teacher if its ok to put pieces of mirror on my pot, because its going in the kiln. she said that it might melt, but i could try glass beads.
so, my question is, would mirror pieces melt in the kiln? and if so, why would mirror melt, but glass beads wouldnt? goesnt blass melt in house fires and things like that? and arent mirrors made from glass?
thanks!
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Okay glass does melt in the molten stage. While materials such as "vaseline" glass are also glass-ceramics, the term mainly refers to a mix of lithium-, silicon-, and aluminium-oxides which yields an array of materials with interesting thermomechanical properties. The most commercially important of these have the distinction of being impervious to thermal shock. Originally developed for use in the mirrors and mirror mounts of astronomical telescopes, these materials have become known and entered the domestic market through its use in glass-ceramic cooktops, as well as cookware and bakeware.The crystalline component of thermal glass-ceramics, beta spodumene, has a negative coefficient of thermal expansion, which contrasts with the positive coefficient of the glass. Adjusting the proportion of these two materials offers a wide range of possible coefficients in the finished composite.Glass-ceramic is a mechanically very strong material and can sustain repeated and quick temperature changes up to 800 - 1000°C. At the same time, it has a very low heat conduction coefficient and can be made nearly transparent (15-20% loss in a typical cooktop) for radiation in the infrared wavelengths.
Hope that helps!!!
--natalie
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