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Ceramics1

Second Quiz

QuestionAnswer
What is joining? while pieces of wet clay can be combined simply by pinching and compressing them together, leather hard clay requires use of the slip and score method, in which parts are bonded together using slip made from the same clay body.
Hand building methods used to assemble or create a piece primarily by hand (rather than shape it entirely on the wheel or in a mold); the following categories isolate techniques that can be used alone, however in practice they overlap.
Pinching method of hand building, this is a form created from one single chunk of wet clay which is pinched and pressed into shape.
coil building method of hand building where coils of wet clay are layered in succession, sometimes with slip in between,until a form is achieved.
slab building method of hand building where slabs of clay, usually leatherhard, are joined together with slip where the edges meet; the slabs themselves can be rolled out, sliced from a large chunk of clay, or created from forms that have been thrown on the wheel.
sprigging method of hand building where small decorative clay forms are attached to the surface of a pot with slip; sometimes these forms are made with press molds.
what is extrusion? clay is squeezed through a hole that has a particular shape, depending on their shape and whether they are made hollow, extrusions can be used as handles, pots, knobs, cups, etc.
What is throwing? making forms with the use of a potters wheel.
what are bats? they are flat disks of wood, plaster, or plastic which can be attached to a wheel head so that when a pot is thrown on its surface it can be easily removed.
What is casting mold? made by taking a plaster casting in two or more parts from an original shape and have two uses in ceramics; press molding and slip casting.
what is press molding? clay is pressed into each part of the mold, slip is applied to the edges of the clay where they will meet, and the mold is put together, forming a copy of the original.
what is slip casting? a special prep of liquid clay (casting slip)is poured into a mold which is tightly bound together to avoid leakage;as the plaster absorbs the water in the clay,a layer of clay gradually builds up on the inner surface of mold until rest of slip poured out.
What is glaze? a fluid suspension of finely ground minerals applied to bisqueware and fired to its melting point to form a glassy surface; it has three main components.
what are the three main components of glaze? silica glass), clay ( a stabilizer), and flux (usually derived from felspar).
what is flux? any ceramic material which lowers the melting point of other materials in the firing process.
What is glaze is application? glaze that is applied by dipping the pot in the glaze,pouring the glaze onto the pot;generally desirable to have a coat of even thickness, covering all but the area that will touch the kiln shelf.
How does ideal thickness vary in glaze application? it varies greatly depending on glaze formula, firing temperature, and the desired surface quality.
What is flow? The degree which a glaze melts and moves downward on the pot; this is a function of several factors, the glaze formula, thickness of the glaze application, shape of pot in relation to gravity, highest temp achieved in given firing and rate temp achieved.
shrinkage clay shrinks in tow completely different ways; before firing it shrinks as it dries, and in the firing it shrinks because the particles partially melt and fuse together.
vitrification maturation; the process that happens when the temperature is high enough for the particles in a clay body to begin to fuse together and become nonporous; the furthest stage to which a body can be taken without slumping.
wax resist material applied to keep glaze or slip from adhering to the surface of a form; this technique is used in two ways;decorate the surface of a pot, and to make sure the foot of the pot remains unglazed so it will not fuse to the kiln shelf.
burnishing rubbing the surface of a pot with a stone, spoon or plastic bag until it develops a sheen; the surface quality, which varies from waxy to glossy,depends on the timing of the burnish, which can be done on greenware at any stage from leatherhard to bone dry
sgraffito drawing or scratching through and applied layer of slip to the contrasting colored clay beneath.
Created by: jphoto