Transcript Slide 1
Ceramics The art and process of making objects from clay Clay – Decomposed Rock Basically, clay is mud Clay Mine Prepared & processed clay Powder & plastic Clay drying Different types of clay bodies Earthenware Terra Cotta Stoneware Porcelain Stages of Clay • • • • • • Powdered Slip Slurry Plastic Leatherhard Greenware Ceramic Process 1. Wedging ~ the process of mixing the clay by hand by rotating and pressing a clay ball on a surface. The purpose is to thoroughly homogenize the clay and to remove all air bubbles. 2. Construction ~ handbuilding or throwing Pinch pot Coil Construction Slab construction Carving & Modeling can be done with any construction method The ceramic process (continued) 3. Leatherhard ~ Clay that is partially dry to be slightly stiff. Some slab construction and carving is best done in this stage. 4. Greenware ~ unfired pottery that is bone dry. In this stage, the clay is most fragile 5. Bisque Fire ~ The process of firing unglazed greenware in order to harden the clay 6. Bisqueware Unglazed pottery that has been fired to a low temperature in order to harden the clay and make it more durable for glazing. 7. Glaze ~ a mixture of chemicals in a liquid state that when fired to high temperatures fuses to a ceramic surface and creates a glassy coating. The process of applying glaze to a clay surface. 8. Glaze fire ~ The kiln reaches temperatures over 2200F during glaze firing. This causes the powdered glaze to transform into a strong, glassy coating.