Why does glaze make the surface of a ceramic cup smooth?

Why does glaze make the surface of a ceramic cup smooth? The glaze in Chinese characters means oily luster, so the word '油' is used to express the luster on the surface of the porcelain tableware, but because the word '油' represents food, it was modified by later generations to express the brilliance of 'Cai'. The word 'you' in the oiled word is synthesized into the word 'glaze'. Glaze is a continuous glassy layer attached to the surface of the ceramic body, or a mixed layer of glass and crystals. The glaze may be produced by the calcium-containing stone and charcoal ash used in ancient stone cooking, or it may be inspired by the beautiful texture of the surface of the shell, and it may be made by consciously using shell powder as the raw material. In fact, as early as the Shang Dynasty more than 3,000 years ago, our ancestors learned to use rocks and mud to make glazes to decorate chinaware ceramic. According to industry experts engaged in mug customization, in the Han Dynasty, paper warm lead glaze using lead as a solvent was invented. Later, ceramic artists used the phenomenon that kiln dust naturally landed on the green body to synthesize the glaze, and then used plant ash as A raw material for making glazes. The glaze used in the production of modern daily ceramics is divided into lime glaze and long ancient glaze. Lime glaze is made of glaze fruit (a kind of natural mineral raw material similar to porcelain tableware stone) and gray glaze (main ingredient calcium oxide). Feldspar glaze is mainly composed of quartz, feldspar, marble, kaolin, etc. Adding metal oxides to lime glaze and Changgu glaze, or infiltrating other chemical components, will result in a variety of glaze colors. Generally, the thickness of the glaze is only 1%-3% of the thickness of the green body, but after kiln fire roasting, it adheres tightly to the porcelain white porcelin dinnerware body, making the porcelain compact, soft in luster, impervious to water and air, and it is bright as a mirror. feel. At the same time, it can improve the intensity of use, prevent pollution and facilitate cleaning. There are many types of glaze. According to the body, there are porcelain glaze, pottery glaze and flint glaze; according to the firing temperature, the glaze fired below 1100°C is called low-temperature glaze, and it is fired between 1100°C and 1250°C. The resulting glaze is a medium temperature glaze, and the glaze fired above 1250°C is a high-temperature glaze; according to the characteristics of the glaze, the white glaze is probably because of people’s love for silverware, and the color glaze is popular with people because of its colorfulness and crystallization. The patterns of the glaze are changing and beautiful. The kiln glaze is full of dazzling and beautiful. The cracked glaze is clear and simple, elegant and unique. In addition to the above, there are matte glazes, opacified glazes, salt glazes and so on.

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