Full-throw Glaze With Black Gold Color Material Common Problems And Analysis
In recent years, the prevalence of all-to-glaze for glaze black color materials (especially for black gold flower products) the demand for color and color quality and hair purity have higher requirements. Ceramic manufacturers in the daily use process will find that different ceramic glaze enterprises to provide black pigments there are great differences, and the universal existence of pinhole quality problems. Such problems are mainly determined by the formulation of color and the production process.
Ceramic glaze is divided from the structure with black color material and should belong to the spinel series. Because of the different elements, different spinel can have different colors, such as magnesium spinel between red, blue, green, brown or colorless, zinc spinel dark green, iron spinel black, etc.
Ceramic black color material should belong to the composite spinel combination hair color. The spinel structure is a hard glass-shaped octagon or particles and blocks, natural spinel in nature appears in igneous rock, granite and metamorphic limestone, some transparent and beautifully colored spinel can be used as a gem, and some as a magnetic material containing iron. More than 200 spinel varieties can have been created by artificial methods. As a ceramic color material of the spinel structure, the high temperature stability and chemical stability are very prominent and obvious, we commonly used brown and grass green belong to this kind of structure. However, in different base glazes in the ceramic color formula in the composition of the dissolution rate is a certain difference, for example, in the base glaze containing zirconium oxide components there is a tantalum component of yellowing, ferro-red and other products of the hair color will be significantly better than other color products without tantalum. Similarly, in the base glaze containing high zinc, the gold and dark brown products of the iron series will be relatively better.
For the ceramic black and cobalt black series, the base glaze in zinc oxide and zirconium oxide and other common ingredients are not conducive to black hair color. The properties of zinc oxide and zirconium oxide are both emulsion effects and promote crystallization. Therefore, in the production, if the glaze burning temperature is high or the composition of the zirconium is high, the glaze with black products may appear glaze or hair color significantly reduced. The common problem in production is that cobalt blue product glaze in the zirconium glaze and the appearance of cobalt blue color points, especially in the use of cobalt black products, cobalt oxide and glaze in the higher the content of zirconia, glaze crystal cobalt blue color dot sits will be more. In addition, high-temperature glaze containing zinc oxide or zirconium oxide, black products tend to brown the trend, with the increase of the temperature of the glaze burned, the trend of red-brown tone will be more obvious.
There have been ceramic enterprise technical personnel to the author reflected that Foshan ceramic glaze enterprises produce glazed black products with high temperature, especially in daily porcelain calcination temperature of more than 1250 degrees C after the situation of glaze analysis. Generally speaking, the situation of black products is more common, from the formula of black products can also be seen, the cooling effect of manganese oxide is very obvious, the color formula of manganese oxide content directly related to the high temperature stability of black in the glaze. In the whole glaze products, the content of manganese oxide is too high and the appearance of pinholes has a direct relationship. In addition, cobalt oxide in black inkjet coloring material has a direct relationship between intolerant foaming and increased conductivity.
The use of a shopping mall in the old saying "one penny, one cent of goods", color products in the performance indicators of the main raw materials are directly related to the final quality of the product. Perhaps the use of poor raw materials can be under certain conditions to achieve normal performance indicators (e.g. the use of recycled cobalt oxide instead of industrial grade cobalt oxide production of black color materials), although the significant cost reduction, but under more stringent testing conditions, non-conforming raw materials and high-quality raw materials can still be distinguished. Especially to do brand enterprises, we must ensure the quality of raw materials.
