Porcelain is made of vitreous ceramic products, which are produced from kaolin, quartz, feldspar and white clay clay blend, which do not spill, translucent, generally white.
The first is the soft (low-grade) ceramics called Persian strong> in the 8th and 13th centuries in Southeast Asia. baked) and spread from North Africa to the Iberian Peninsula and then to Italy and Europe.
The other is a hard (high-grade baked) pottery, developed in China during the Tang and Sung (8th and 13th centuries) To Japan, and then to Europe. This hard-baked pottery is named as porcelain in Europe. strong> The raw material is a stone containing feldspar, quartz and fine-grained mica called chinese tun and petuntse and paingo, pai-tu or ngo-tu they used a white plastic soil. The dough is rested for a long time so that it can reach the desired plasticity. It is stated that a raporda dough is kept for 10 years. The glaze was applied as a few layers in varying transparency.
Soft Proselen h2>
Porcelain glazed and slim finish porcelain in white or ivory color. Kaolin, plastic clay, quartz and feldispattan are made. It is obtained by double cooking. The first biscuit firing occurs at 840-930 ° C. If the glaze is baked, it is done at 1250-1325 ° C. The soft porcelain composition contains 35% kaolin, 25% quartz and 40% feldspar. Hard porcelain
Hard porcelain h2>
A porcelain with a high strength, hard, transparent, white and fully reinforced. Biscuit firing at 800-900 ° C, glaze firing at 1400-1450 ° C. Pure quartz (25%), feldspar (25%) and high quality washed kaolin (50%) are produced. Famous Chinese, Japanese and French porcelains are hard porcelain types. Primitive materials are made into very fine powder under water. After the fluent and homogenous dough obtained in this way is partially dried, it is allowed to mature and finally shaped either by turning or molding. In this last case, a dough made of porous dough mixed with water is introduced and a part of the water is absorbed and the shape of the remaining sludge mold is taken. This portion is removed after drying and cooked. Since this crude product is still porous, after the feldspar is immersed in the soda, it is glazed with baking at 1450 ° C. The decoration of the product is provided with cobalt, chromium, titanium oxides based on 1450 °, or some other colors heated after the second baking, eg at 800 ° C.
Today, porcelain wax has a very wide structure . After understanding the technical features such as porcelain, strength, refractoriness, electrical insulation, these properties have been improved and special structures used for chemical, industrial, electrical and kitchenware purposes have been introduced. In this respect, the main purpose of today’s porcelain manufacturing is taken into account and properties such as brightness, whiteness and translucency can be neglected. Share Information