The technological characteristics of bone china: 1. The second firing process is a typical representative of soft porcelain in the history of bone china, with high-temperature biscuit firing and low-temperature glaze firing as the most significant process features. The secondary firing process of bone china is different from the traditional low-temperature biscuit firing and high-temperature glaze firing processes, which can better solve the problems of high-temperature deformation and glaze gloss. The Japanese call unglazed green bodies at low temperatures (around 900°C), unglazed green bodies at high temperatures (around 1300°C), and glazes called Honyaki. 2. The forming process bone china uses 40%-50% non-plastic bone powder. The total amount of clay in the green body formulation is lower. Compared with ordinary ceramics, the plasticity is poor and the forming is more difficult. Generally, the following methods are used to improve plasticity or yield: ①Use high plasticity clay ②Use organic plasticizers such as CMC ③Increase particle fineness and practice mud for many times; ④Use hot roll forming machinery. 3. The firing process The use of imitation saggers is the most representative process in the bone china firing process. Because the firing range of bone china is narrow, the shrinkage is large, and it is easy to be deformed during firing. Processes such as bracing or burial firing can solve the deformation problem. 4. Kiln furniture materials The kiln furniture materials used in bone china have higher requirements than general ceramics. Most kiln furniture must match the product. Generally, each type of product has a matching kiln furniture. It is also a place where bone china production is more cumbersome than general ceramic production. The bone china production team has great demand for kiln furniture materials, and the requirements for the working surface of kiln furniture products are also quite high. 5. The mold material bone china has a high production cost and is generally suitable for making high-grade porcelain tableware. The carcass is thin and the mold requirements are stricter. It is necessary to use high-quality gypsum for fine processing and production, and to strictly control the number of times the mold is used, and the mold cannot be used for a long time. 6. Production management The material of bone china is white and delicate, small stains are particularly dazzling, the production of high-grade porcelain, strict and meticulous production management to ensure product quality.
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