Classification of ceramic tableware by calcination temperature

Ceramic white porcelin dinnerware is classified according to the calcination temperature. Ceramic tableware can be divided into high temperature porcelain, medium temperature porcelain and low temperature porcelain from the forging temperature. High-temperature porcelain refers to porcelain sintered above 12000C. Because the higher the temperature, the greater the crystal density of the glaze, the higher the strength of the porcelain surface, the less likely to produce scratches, the color is 'white' and the white is not yellow, and it has the reputation of 'white as jade'. The firing temperature of medium-temperature porcelain is 1000-11500C; the firing temperature of low-temperature porcelain is 700-9000C. Most of the lead and cadmium in the high-temperature porcelain are volatilized, while the lead and cadmium in the medium and low-temperature porcelain are more serious. The easiest way to distinguish high-temperature porcelain from medium-temperature porcelain is to look at the color, see the thickness, and listen to the sound. First of all, by looking at the color, it can be judged that more than 60% of the medium temperature porcelains are. The glazed vitrified layer of medium temperature porcelain white porcelin dinnerware is relatively thin, with only a shallow layer of refraction, and even the color of the tire can be seen directly. The glaze and paint used for medium temperature painting are different from the high temperature in terms of formula, and the effect is Similar to gouache painting, the painting is generally rough, which is not only due to the craftsmanship, but also depends on the quality of the tire and the characteristics of the paint. Every city has the kind of cups sold on trolleys, all of which are medium temperature porcelain. Many peripheral products, including Starbucks mugs, are medium-temperature porcelain. This standard can be used to determine the feel of medium-temperature porcelain. The glaze of high-temperature porcelain is moist and has a clear feeling, which is close to the refractive index of high-quality glass (except for matte and matt porcelain). Generally speaking, good high-temperature ceramic tableware has a thinner matrix than medium-temperature porcelain, because medium-temperature porcelain has a low firing temperature, low sintering degree, and high-quality temperature porcelain is loose. In order to improve impact resistance, the matrix will be relatively thick; Flick the utensil with your hand, the sound of the high-temperature porcelain is clearer and closer to the metal sound, and there is a sense of denseness in the sound, while the sound of the medium-temperature porcelain is relatively dull, which is determined by the density.

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