16 display bone China defects

9, dry bone porcelain glaze and meaning: the flow and the bone porcelain products sintering temperature is higher than the melting temperature of the glaze abnormal flows in the bone porcelain glaze, base bone China products sticky phenomenon called flow glaze. But need to normal flow such as lang kiln red glaze, fishing flow glaze enhance brightness, such as red kiln, colorful variable means of bone porcelain glaze does not belong to the case of the defect. If bone porcelain glaze and the melting temperature is too low, under the condition of high sintering temperature, viscosity and too small, easy to be absorbed by bone porcelain body, bone China products surface by dry left a thin, this phenomenon is called mummification. The reason: 1) Bone porcelain glaze composition, fusible materials content too much, In addition to the color must flow) Appropriate to improve bone porcelain glaze composition, melting temperature ( 2) Bone porcelain glaze layer thickness for flow glaze and drying are decided. Thick glaze is easy to flow, is easy to dry, thin thickness uneven may appear shunt glaze and part of drying. To overcome the way: ( 1) Ceramic glaze formulation adjustment, improve the melting temperature and high temperature viscosity. ( 2) Control of sintering temperature and bone porcelain glaze layer thickness ( Main glaze grain fineness, bone porcelain glaze layer thickness and firing temperature see table 1) 10, bone porcelain axial plane cloudy meaning: form a layer on the surface of bone porcelain body shell and other means in the form of material; Eggshell appearance & throughout; , if it after burn and get the smooth of normal bone porcelain glaze. The so-called eggshell appearance, is when there is a lot of 20 - 30 meters, the size of the bubbles caused by bubbles of light reflection, bone porcelain glaze present fine moire phenomenon. The defects of appear at the bottom of the temperature rise is slow, and bone China products owe when burned more. The reason: 1) Bone porcelain glaze with the refractory material, such as clay mixed in glaze or glaze proportion or trapped glaze is different, the kinds of the amount of defects is different, the order is: talc glaze & lt; Lime glaze & lt; Dolomite glaze ( 2) Outfit billet of kiln, took the impurities to the bone China body surface, also can make the bone porcelain glaze opacity ( 3) Ceramic glaze firing process, composition of carbonate decomposition and decompose and produce carbon dioxide clay moisture. The powder in the glaze composition have all kinds of gas absorption, Fe2O3 oxygen, nitrogen of feldspar and so on, these gases at high temperature from the eduction in body, has been vitrified right now, so can't walk, especially when the glaze contains pyrolysis oxide, glaze turbid phenomenon produces more. Under the melting point to extend the time of heat preservation, bone porcelain glaze in alkaline substances ( Flux) Volatile, also easy to produce bone porcelain glaze opacity. Sintering temperature enough glaze owe to burn without melting. On the surface of the billet surface shell material appeared in the form of more. Celadon firing reducing flame atmosphere is very weak, the oxidation still have when part can't reduction into ferrous oxide, and to the bone porcelain glaze to green in yellow color. When sulfate in bone porcelain glaze billet, sometimes there are free of SiO2, this also makes the bone porcelain glaze opacity. Used a strong reducing flame, burning methane content in the gas at high temperatures and a variety of hydrocarbon can be disaggregated into carbon and carbon composure in bone porcelain body surface phenomenon, surrounded by the glaze of melt and burn out, make the bone porcelain body with yellow, glaze smoking. — Tangshan bone porcelain gifts wholesale to be continued. 。 。 。 。 。