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Bone china production
Bone china production
The formation of bone china mainly depends on silica, alumina and calcium oxide. The higher the content of calcium oxide, the better the color. In nature, there are not many sources of calcium oxide, so bone powder of animals is selected as a source of calcium oxide.
In fact, the so-called bone china is a bone china product made from herbivore ashes (mainly Ca3(PO4)2), mixed with high-quality kaolin, quartz and other accessories, and glazed at 1280 °C. In general, the addition of 25% bone powder to the raw material can be called bone china, but the world's most recognized bone china is 45%-51% bone powder content, and bovine bone is preferred.
The production process goes through the process of grouting, die-pressing embryo, gypsum mold dehydration, and calcination, glazing, decal paper baking, etc., and is fired at a high temperature to become a porcelain with high whiteness, high transparency and fine porcelain. In the process of firing, bone china is extremely demanding on its physical and chemical indexes such as regularity, whiteness, transparency and thermal stability, and thus the rejection rate is very high. Due to the sophisticated materials, fine production and strict standards, the value is higher than other porcelains.
The unique firing process and the addition of bone carbon eliminate the impurities in the porcelain clay. The bone china is whiter, finer, more transparent, lighter, less flawed, and thinner than ordinary porcelain. There is a special kind of visual cleaning. The sense of intensity is higher than that of ordinary porcelain, which is twice that of daily-use porcelain. The higher the content of bone meal, the lower the composition of the clay, the easier it is to crack during the manufacturing process, the higher the technology required for forming, and the more difficult it is to burn, so it is more precious.
Someone has done such an experiment, putting 4 bone china cups under a Rolls Royce wheel, these 4 crystal cups can be qualified to support the weight of the RV!
High-grade porcelain also has porcelain and pearl porcelain similar to bone china. Because the cost is too high and there is almost no industrial production, bone china is recognized as the most high-grade porcelain in the world.
(Emperor Court) is now the master of domineering, enjoy the glory of the emperor, even in the dark can not stop its noble light
Play and collect:
1. The British royal family, the American middle and upper class drink tea, and use the bone china cup. When you meet the bone china, the aristocratic temperament in her bones is inadvertently revealed...
2. Ceramic originated in China, but bone china was founded in the United Kingdom. It has long been a special porcelain for the British royal family. Just now, bone china is also a symbol of the status and status of the owner.
3. A person who collects bone china once said that it should communicate with bone china with touch, sight and hearing. If you don't understand, you should hold the bone china in your hand, observe the transparency of the bone china against the light, feel the delicate and hard porcelain by hand, and then use your index finger and thumb to gently play, you can hear the bone china. Hey, it’s a crack.
(驿路花开) When eating is not just a full meal, when dining becomes a lifestyle, then what is eaten is no longer the subject of our concern, but where it is eaten becomes a self-evident judgement. A taste, an atmosphere, a kind of enjoyment and an identity...
The British royal family, the American middle and upper class people drink tea, and use the bone china cup. For more than two hundred years, they have been favored by the British royal family. Queen Elizabeth, Prince Charles and Princess Diana are all distinguished guests.
When you meet the bone china, the aristocratic temperament contained in her bones is inadvertently elegant. Since the Enlightenment of the 18th century, the bone china has been splendid in the royal family of Europe and has become a delicate bone on the table of the nobility. The bone china was used by the royal family for nearly 250 years. The Queen of Russia is also a loyal supporter of bone china. She once had 952 bone china. From the dinner of the White House in Roosevelt in 1902, to the first luxury cruise ship of Queen Mary in 1935. Hang, until the coronation ceremony of Queen Elizabeth in 1953, in the feast of the annals, the bone china tableware is always proudly listed in a delicate figure. In the ordinary people who pay attention to the quality of life in Europe, it is easy to see the elegant hostess, brewing tea with bone china. The gentle golden rims sculpt the details of a perfect life. A lot of bone china was cast by the royal family. When you hold the bone china cup and watch the light penetrate the soft milk white, you may wish to integrate the meticulousness of life into the stunner in your hand, and the achievement is a story that has been circulating for centuries.
Definition of a bone china: Bone china is the abbreviated name of bone china. It is a porcelain made of bone charcoal, clay, feldspar and quartz as the basic raw materials. It is fired twice by high temperature and low temperature glaze. .
Two bone china features:
1 Appearance: Porcelain is fine and transparent, the shape is beautiful and elegant, the color surface is moist like jade, and the flower surface is colorful.
2 High grade: Produced in the UK, it has long been a special porcelain for the royal family and the nobility. It is the only high-grade porcelain that is recognized in the world. It has both the dual value of use and art. It is a symbol of rights and status and is known as the king of porcelain.
3 Health products: The bone china is mainly made of bone, and the bone china decoration and glaze fusion are integrated into one body. It does not contain lead and cadmium harmful to the human body. It can be called a real “green porcelain”. Long-term use is good for human health.
4 Process fine: secondary firing, complex process, only the United Kingdom, China, Japan, Germany, Russia, Thailand have production. The bone china is light, fine and hard (twice as much as daily-use porcelain), is not easy to wear and rupture, and does not crack at 180 ° C and 20 ° C water, and the water absorption rate is less than 0.003%.
Bone china (cultural art)