Bone porcelain blank 01

Billet is bone China after ingredients and processing raw materials, mixing of many components, is the basis of bone China production. And body formula after the raw material is depends on the interior and the exterior of bone China products, scientific quality, to the difficulty of the production control and production cost, etc. , determine success or failure of bone China products production. Bone China ( Bone China) Production has been 200 years of history, the bone porcelain body formula has been very mature, the general scope of ingredients: bone meal 40% ~ 60%, 8% ~ 15% feldspar, quartz 8% 2%, 25% ~ 45% of clay. Bone porcelain blank bone porcelain body formula is the premise and key production, usually on the basis of the test to determine the production formula. Bone porcelain blank characteristics and classification of bone China, Bone China) Blank due to a large number of join bone powder of low plasticity, a relatively small amount of clay, so the plasticity of the sludge is poor than general ceramic plastic. According to different forming methods, the bone China ( Bone China) Billet is usually divided into slurry injection ( Mud) , plastic clay materials, three categories of pressed powder, its water content is commonly: (1) slurry injection ( Mud) General moisture content 28% ~ 35% (2) plastic sludge moisture content 18% ~ 25%; (3) pressed powder is divided into half dry pressure and dry material, water is divided into 8% ~ 15% of the known as the semi-dry pressing materials, called dry pressing material containing moisture 3% ~ 7%. General bone China ( Bone China) Production enterprises, more use of grouting pressure forming, rolling, and plastic forming, dry forming method with less. The representation method of bone porcelain blank ingredients the representation method of bone porcelain blank generally have ingredients than representations representation, chemical composition, billet type notation, mineral composition representation and triangle representation, etc. Bone China ingredients than the number of raw materials used in the notation to use formula to represent the formula composition method, called proportioning notation, also known as the shoes fit method. This is a common method, is also in the production of bone China direct, practical method, this method is specific reflect bone porcelain the name and quantity of raw material, facilitate direct production or test, table 3 - 1 is expressed in proportioning ingredient formula. This method is intuitive, simple, easy to weigh and memory, and suitable for general factory. Because bone China raw material origin, different ingredients have bigger difference, so, this method generally have larger regional, bone China material after replacement, not directly use or control. Chemical chemical composition of representation is representation with bone China body in the chemical composition of the mass fraction to indicate the method, and the oxide quality score notation. Chemical composition representation is to compare the advantages of accurate chemical composition of bone porcelain body, can according to the content of its estimate formula firing temperature, colour and lustre and shrinkage, etc. For example, if the ignition loss formula is more, then bone porcelain body or other high temperature decomposition of the organic matter content is seen more and larger shrinkage or brown eye, defects such as bubbles, may be easy to crack. Bone China billet Fe2O3, TiO2 such as high in the body, the bone porcelain body color is gray or yellow, white degree is low. If P2O5 is higher, while KNaO lower sintering temperature is higher, the body is more difficult in sintering. But this does not know the composition of the ingredients, cannot be used directly, also hard to show the characteristics of mud or clay material performance, there are considerable limitations. Bone China billet type representation according to the chemical composition of bone porcelain body to calculate the quantity of various oxide material, according to the basic oxide, neutral oxides and list them in order of their acidic oxides number of molecules, this formula is called billet type or empirical formula. Ordinary ceramic billet and glaze are commonly used this approach said. — The bone plate to be continued. 。 。 。 。 。