Bone China, named Bone China in English, was invented by British people who love porcelain. It is a kind of porcelain which is made of animal bone charcoal, clay, feldspar and quartz as the basic raw materials through high-temperature plain firing and low-temperature glaze firing. It is recognized as a high-grade porcelain in the world. Its light and transparent texture has been widely welcomed for hundreds of years.
The main raw materials of Chinese porcelain are kaolin, porcelain stone and a small amount of lime. Bone china materials generally contain 30-45% bone powder, so it can have better light transmittance and can be made thinner. Therefore, Bone China looks crystal clear, with good hand and appearance.
Why is bone china the aristocrat of porcelain? This paper summarizes the following, mainly from the following aspects:
raw material
Bone china is made of animal bone charcoal, clay, feldspar and quartz. Commonly used are the bones of cattle, sheep, pigs and other animals. According to the British, 2-4-year-old calf bone is better for Bone China, sheep bone has better plasticity and easy formation, but its whiteness is not as good as bovine bone. Bovine bone is a better raw material, followed by sheep bone and pig bone.
Qiao wood bone porcelain all choose cow bone powder as the raw material, and the content is more than 30%, its color is bright, warm as jade.
Skillful wood bone china tableware of lotus in the sunshine
technology
With good raw materials, we need better technology, otherwise we will be exposed to natural disasters.
When the bone meal content reaches a certain proportion, the quality of porcelain will be greatly improved, which is mainly reflected in the glossiness and moistening degree of utensils. However, if the content exceeds a certain proportion, the composition of the clay will be relatively reduced, and the porcelain will become excessively soft, and the more likely it will be cracked in the production process. Higher technology is required in the forming process, which increases the difficulty of firing, so it is more precious.
Firing:
(1) After forming, Bone China is fired at 1250 ℃. Due to the high shrinkage rate of Bone China, the finished product will shrink by 20% (the general porcelain shrinkage is 7%). Therefore, the shape is easy to deform. The plates and bowls must be placed on the special bowl for a long time.
(2) after checking the shape and size of the surface, spray the glazing agent on the surface and spray the glaze at 1150 degrees.
Coloring:
The general coloring method is to paste transfer paper on the white finished product and burn it at 820 ℃.
Skillful wood Bone China is hand colored, the texture of the picture is more lifelike. Health and environmental protection
Bone China not only has a gorgeous and exquisite appearance, but also is conducive to people's health compared with ordinary porcelain.
Porcelain products in daily use will inevitably be corroded by acid and alkali, and there will be trace metal spillover, which will affect human health over time. The bone porcelain does not contain lead and cadmium. The in glaze color and underglaze color bone porcelain is not only free of lead and cadmium spillage, but also not easy to wear and fall off. In addition to being used as general tableware, it is also suitable for microwave oven. It is worthy of green health ceramics.
Bone china is expensive because of its raw materials and technology. We must be careful in the selection of Bone China, the following small series teach you a few ways to identify bone porcelain~~