1 under the bone porcelain glaze defects

1, bone China pigment variation meaning: also known as bone porcelain decorative pattern change color. Symptoms for painting work outlining, water and other operation method of constant and bone porcelain products after firing, flower color variation such as montmorillonite, light, short of the phenomenon such as reach ideal effect, defect classification of color deviation produced in bone porcelain porcelain material preparation, preparation and processing of bone porcelain glaze, glazing and firing process. The reason: 1) The composition of bone China porcelain material, high temperature performance of the color is not stable. ( 2) A temporary change of bone porcelain glaze composition. ( 3) Burning into the atmosphere. ( 4) Spray glaze or other glazing method, bone porcelain glaze layer thickness is differ with poor brightness of colour and lustre. To overcome the way: ( 1) Strict processing refined bone China blue color material. Bone China blue color material is the main agent in drill oxide, undressed ore pass, elutriation, calcining, crushing and grinding process can be applied. In drilling and soil mineral raw materials in addition to containing high cobalt, still contain different amounts of manganese, iron oxide, etc. The composition of bone China blue color has a great influence, whether the content of different composition adapted to determine the quality of color. Since the qing dynasty in yunnan huize, should be good and banyan peak ( Xuanwei) For the county of bead Ming, such as the good, bright colour and lustre is bone China standard color of blue and white. Its chemical composition. Compound bone China porcelain material is containing Co08 - the traditional method Soil cobalt ore (9% Such as yunnan called the cloud of ink. Zhejiang produce called wu must material, directly after calcining deployment of painting called bead Ming material and the soil is in jiangxi province & other; Throughout the pearl &; Etc. ) With some oxide ( Such as ZnO, A1203, etc. ) And bone porcelain glaze, such as, add water after full mixing grinding ( Through the low temperature calcination) Standby, water dyeing must also mixed. Tea juice. At present because of the lack of pigment, so to carry on the synthesis, its formula is: among them; Co203； MnO2； Fe2O3 molar ratio should be controlled at 0. 5-2. The 0-0. Between 3, this is good for color, painted with enamel porcelain, bone is green dark as beads, general drill cyan material formula. Simple oxidation drill in green color purple. Normal drilling and the composition of the oxide is not pure, often contain small amounts of impurities such as ferromanganese under the temperature of 1300 ℃ in reducing flame burning, these impurities into low oxide make hair color faded, blue is bright, the reduction in oxidizing flame if these oxide into high oxide a dark gray colour, or dark cyan, so the bone porcelain drill green material in reducing flame burning. Bone China porcelain material composition ratio of various materials in the component directly affect the effect of blue and white color. Bone China porcelain material drawing firing effect in qing cui, jade-like stone embellish is bright, avoid by all means is green, blue, or blue and purple. In order to improve the sintering temperature, chemical stability and thermal stability. But is unfavorable and exorbitant or not cooked, make the material color black. General control in 1230 & ndash; Burn into a range of 1280 ℃. Before metallurgical ceramics, Chinese Academy of Sciences, China ( Bone China) Research institute, was a bone China porcelain material with research, its composition and color changes after burn. Rough in the mass production of blue and white porcelain main oxidation drill color, so also called & other; Bone bowls green & throughout; , in general, the chemical composition of oxidation drill. ( 2) According to the bone China porcelain material optimum temperature, adjust the bone porcelain glaze formula, with lime glaze, especially bone China is lime base glaze for one by one. The bone porcelain glaze transparent and green hair color, bone porcelain glaze layer meng not easily also spend a bit thick. Effect of bone porcelain glaze glossiness good, transparency, high melting temperature, wide firing temperature crystallization, glair, the phenomenon such as flow glaze, bone porcelain glaze billet combined with strong performance and process performance is good. Also the commonly used green glaze formula. — Tangshan bone China cups to be continued. 。 。 。 。 。