Ceramics

The raw material mixtures used to form ceramic objects, composed primarily of clay minerals, fluxes, and fillers. The three main categories of clay bodies are earthenware, stoneware, and porcelain, each differing in composition, firing temperature, and final properties such as porosity and color.

The process of heating ceramic objects to high temperatures in a kiln to permanently harden them through sintering and vitrification. Different kiln types include electric, gas, wood, soda, and salt kilns, each imparting distinct characteristics to the finished work.

The application of a glassy coating to a ceramic surface that, when fired, melts and fuses to form a smooth, often decorative and waterproof layer. Glazes are composed of silica (glass former), alumina (stiffener), and flux (melting agent), with various metal oxides added for color.

A forming technique in which a lump of clay is centered and shaped on a rotating potter's wheel, allowing the creation of symmetrical hollow forms. The technique requires coordinated hand pressure and wheel speed to pull walls upward and shape profiles.

Methods of forming ceramic objects without a wheel, including pinch, coil, and slab construction. These techniques allow for asymmetrical, sculptural, and large-scale forms that are difficult or impossible to achieve on a wheel.

The first firing of unfired (greenware) clay, typically to a temperature between 900 and 1000 degrees Celsius. Bisque firing drives out all remaining water, burns off organic material, and converts the clay into a porous but hard state suitable for glazing.

Sintering is the process by which clay particles fuse together at high temperatures without fully melting, while vitrification is the formation of a glassy phase that fills pores and makes the body dense and waterproof. The degree of vitrification determines whether a ceramic is classified as earthenware, stoneware, or porcelain.

The science of understanding how different oxide components in clay bodies and glazes interact during firing. Ceramic chemists use unity molecular formulas and tools like glaze calculation software to predict melting behavior, color, surface texture, and fit between glaze and clay body.

A production technique in which liquid clay (slip) is poured into a plaster mold. The plaster absorbs water from the slip, forming a solid clay layer against the mold wall. After the desired thickness is reached, the excess slip is poured out, and the cast piece is removed after drying.

Engineered ceramic materials designed for specific high-performance applications. Unlike traditional ceramics made from natural clay, technical ceramics are made from purified synthetic compounds such as alumina, zirconia, silicon carbide, and boron nitride, and are processed under tightly controlled conditions.