Middle-low temperature sintered fine bone china and production method thereof

Abstract

The invention relates to a middle-low temperature sintered fine bone china and a production method thereof. The china comprises the following chemical components in percentage by weight: 52 to 60 percent of SiO2, 28 to 37 percent of Al2O3, 1 to 4 percent of K2O, 1 to 2 percent of Na2O, 3 to 8 percent of CaO, 1 to 3 percent of MgO and 1 to 3 percent of P2O5; a used formula comprises the following raw materials in percentage by weight: 3 to 8 percent of bone ash, 32 to 45 percent of kaolin, 10 to 20 percent of aluminum oxide and 35 to 50 percent of fusion cake; the sintering temperature is between 1,170 and 1,250 DEG C; and not only a double-firing process of 'high-temperature biscuit firing and low-temperature glazed firing' or 'low-temperature biscuit firing and high-temperature glazed firing' can be adopted, but also a high-temperature single firing process can be applied. The fine bone china has an appearance effect of the conventional bone china, has physical and chemical properties superior to those of the bone china, has the significant advantages of low bone coal consumption and low sintering temperature, and is favorable for reducing the production cost and the energy consumption.

Description

technical field [0001] The invention belongs to the technical field of manufacturing ceramics for daily use, and in particular relates to a medium-low temperature sintered refined bone china and a production method thereof. Background technique [0002] Bone china is a kind of soft porcelain invented by the British in the 18th century. It is mainly made of bone carbon, and some mineral materials such as clay, feldspar, and quartz are added. (1100 ℃ ~ 1150 ℃) secondary firing process firing. Bone China has outstanding advantages such as high whiteness, good light transmittance, fine porcelain quality, etc. It is recognized as a high-grade fine porcelain for daily use all over the world. my country researched and developed some bone china products in the 1970s. After the 1980s, my country's Tangshan, Zibo, Jingdezhen and Chaozhou and other regions successively carried out mass production. [0003] However, bone china also has the following inherent disadvantages: 1) poor the...

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Problems solved by technology

[0003] However, bone china also has the following inherent disadvantages: 1) poor thermal stability, the national standard for bone china thermal stability is 140 ℃ ~ 20 ℃ heat exchange without cracking, far lower than daily fine porcelain 180 ℃ ~ The standard of heat exchange at 20°C without cracking once, this is due to the high thermal expansion coefficient of the main crystal phase calcium phosphate and anorthite of bone china; 2) The firing range is narrow, the reason is that the composition of bone china is located in Near the ternary minimum eutectic point (1290°C) of tricalcium phosphate, anorthite and quartz, when the temperature is lower than the minimum eutectic point, the amount of liquid in the ceramic body is very small, and the product cannot be sintered, and the temperature reaches or exceeds the minimum eutectic point At the same time, a large amount of liquid phase is produced at the same time, resulting in the product being easily softened and deformed. Therefore, the firing is difficult to control. This is why bone china usually must adopt a secondary firing process (high-temperature plain firing and low-temperature glaze firing through imitation saggers) 3) The hardness of the glaze surface is low, which is rooted in the use of frit glaze suitable for low-temperature glaze firing; 4) The cost of the blank is high, and the amount of bone carbon in the traditional bone china blank is generally 40-60%. The high price of bone carbon leads to the high cost of bone china billets

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