Bone porcelain glaze 04

( 6) K2O K2O is one of the main flux in bone porcelain glaze, it can reduce the expansion coefficient of bone porcelain glaze, reduce the high temperature liquid, you can use the alternative Na2O K2O to improve the solubility in water and chemical resistance of clinker stability in clinker can be used in potassium nitrate, feldspar, such as introduction, general use of potassium feldspar in the bone porcelain glaze to introduce. Bone China ( 7) Na2O Na2O is one of the alkali metals in enamel frit bone, bone porcelain glaze of tensile strength and elasticity decreased with increasing sodium, excessive use of Na2O lowers the chemical stability of the clinker. Appropriately increase sodium oxide can increase the expansion coefficient and reduce the softening temperature of the glaze. Alkali powder frit in general use, borax etc, are generally used bone porcelain glaze albite. ( 8) Li2O lithium as flux, in the manufacture of bone porcelain glaze has been widely used. Use lithium instead lead to extensive use of alumina and silica, and can obtain better stability high strength bone porcelain glaze, increase bone porcelain glaze scratch resistant ability. Bone China in the manufacture of clinker, add a small amount of lithium compounds can reduce high temperature viscosity, fast and can reduce the expansion coefficient of the material. Bone China in bone porcelain production, mostly using lithium carbonate, slightly soluble in water, it is not hygroscopic, not agglomeration, easy to save, under normal conditions can be directly applied to the raw glaze, lithium mineral joins overmuch, easy to cause analysis, combined with lithium products more expensive, general addition amount shall not exceed 3% ( Li2CO3) , in order to reduce the height of the clinker, is generally used in joining the frit. Bone China ( 9) (SrO) SrO strontium lead is now recognized as a good alternative, strontium glaze not poisonous no harm to human body, oxidation can make the formation of the low temperature glaze, improve bone porcelain glaze gloss, make the bone porcelain glaze layer development, reduce bone porcelain glaze cracks. Strontium glaze have a good flatness, have higher scratch resistance than lead glaze. In the production of bone China, strontium carbonate is commonly used. No poison, slightly soluble in water and can be used for raw glaze. Add in clinker can decrease the high temperature viscosity, general addition amount does not exceed 10%. Due to the short development history of strontium compounds, less people know about its performance function, and the price is more expensive, is also not too widely used. Bone China ( 10) ZnO ZnO more used in high temperature ceramic glaze, a small amount of ZnO is important in high temperature phase flux, it can expand the bone porcelain glaze melting range, improve the modulus, reduce the expansion coefficient, reduce the cracking phenomenon. Zinc oxide is a good crystalline glaze materials, excessive zinc oxide easy crystallization phenomenon, general control within 10%. In the production of bone China, the zinc oxide into the frit. Directly using zinc oxide, calcined needed to reduce & caused because of excessive shrinkage rate and other Roll glaze & throughout; Phenomenon. Bone China ( 11) PbO lead is an important network adjustment, lead oxide has been applied very early, early molten lead glaze is characteristic of low surface tension, low viscosity, good piece of main flux of bone porcelain glaze glaze suitability and wettability, high gloss, high refractive index and wide firing range. But now because of the dangers of lead, countries have formulated stringent standards discourage the use of lead materials. In the past the use of red lead is introduced into general frit. Bone China ( 2) ZrO2 zirconium effects on bone porcelain glaze is similar to aluminium, can improve the mechanical strength of bone porcelain glaze and chemical stability, reduce the expansion coefficient of bone porcelain glaze, improve bone porcelain glaze cracking resistance. More to join ZrO2, can generate opacifying phenomenon. Introduced generally use zircon, zirconium oxide, etc. Bone China & ndash; Tangshan bone bowls to be continued. 。 。 。 。 。