Across
- 3. crushed brick
- 4. refers to the fired state of a piece of porcelain or stoneware. Vitrified ware has been fired high enough to make it very strong, hard and dense
- 5. made of four components - clays, fluxes,hardeners & openers
- 8. is the mineral form of silica powder used in ceramic glazes and clay bodies
- 9. Often used in clay bodies instead of grog or to augment grog
- 10. fluxes do not act alike but they have characteristics and properties alike and unalike
- 11. ceramics are brittle and many types will crack if subjected to sudden heating or cooling
- 12. clay particles draw together and shrinkage occurs
- 13. having the structure and form of a crystal; composed of crystals
- 15. sands are not suitable for ceramics because of the level of impurities they contain
- 16. that does not fire too vitreous, find themselves in a mix of clays and fluxes that provides an ideal environment for the conversion to cristobalite
- 18. The material that acts as a hardener in glass, glazes, clays and all ceramic
Down
- 1. is a crystalline form of silica. Silica normally exists in nature as quartz. But cristobalite is available as a powder
- 2. (often pronounced sin-nat) - melts at 2012 - 2192f
- 5. Melts at 2102 - 2372f
- 6. generally refers to cracking that occurs in ceramic ware as it is cooled in the kiln. The reasons for that cracking can be many
- 7. Not for stoneware! 5% - 50% of a earthenware clay body. Flint is a microcrystalline form of quartz and has a completely different physical appearance
- 12. up to 25% of a clay body. fuses at 2282f
- 14. used on kiln shelves from enabling ware from sticking
- 17. Alters the vitrification temperature of the clay.More specifically to ceramics flux lowers the amount of heat needed to melt silica