subject: Wei Tao Improved Glazing Technology Equipment Products - Fiber Optic Multiplexer [print this page] 1989 to 1994, Russia Yekaterinburg ceramics factory sanitation products, raw glaze composition changed greatly (see Table 1), their main weakness is glazed light loss. Period, the plant has tried to flux (pegmatite) increased from 36.4% to 43.3% of the way to eliminate this defect, but did not achieve the desired results. Loss of light issues are always there in a month and suddenly disappeared suddenly 1 to 2 times. Regular chemical analysis of the enamel found in the ground within 120 hours of zircon from the ball on the ground, a large amount of alumina. Result, the glaze over the total in calculating the amount of Al2O3 4% to 5%, resulting in loss of optical defects. For some reason every time the ball milling of zircon is low, there will be shiny glaze.
In view of this, to overcome the loss of optical defects, the researchers decided to change the glaze to reduce the content of Al2O3. First, they analyzed the Italian and German companies, the glaze (see Table 2). Then, this plant under the current material and test results, developed to overcome the loss of optical defects and obtain shiny glaze the glaze. Also, the whiteness of the system to take as much as Italy, pure white glaze glaze similar level. Because the brightness depends on the fine grinding of zircon, so the introduction of the Italian production of finely ground zircon (72% or 66% ZrO2). In order to achieve pure white under artificial light, in the glaze composition additionally introduced cobalt sulfate.
Final glaze recipe follows (wt%): 37.5 pegmatite, quartz sand 24.0, 17.0 sorting chalk, zinc white, 5.0, 11.0 zircon, 0.5 barium carbonate, 1 .0 ~ 2.0 clay, 3.0 selected kaolin, 0.015 cobalt sulfate, 0.05 peptapon52 (German "Zschimmer and Schwarz GmbH and Co" a rubber company, can promote the consolidation of the glaze on the products) .
The introduction of this glue in the glaze can enhance the glaze, but also to avoid the products in the transport and into the kiln when the damage, peptapon52 sodium carboxymethyl cellulose may be common alternative, but the sticky matter content to increase to 1.5%, or 30 times. Use glue should pay attention to, and can not be inserted inside the mill, and it should wet a night, then quickly stir cast into the glaze. Apart from this glue adhesion, but also has the electrolyte performance. If the glue enough, can be inserted in the glaze common electrolyte?? Water glass.
By 1997, this factory equipment on all health products are glazed with dipping method glaze, then re-use spray enamel fill enamel. When the density of the glaze dip 1.53g/cm3, make up the glaze when the density of 1.60 ~ 1.61g/cm3.
In this way large amount of glazing in the draft articles is difficult to dry, and the glaze thin green body was visible. Meanwhile, the product has a lot of drip enamel defects. So, when they rely on the proportion of the glaze will dip to 1.61g/cm3 density bottle method of reducing these defects. Complement the glaze, the proportion of bottle-density increased to 1.67 ~ 1.68g/cm3. And deprive the organization of production Sihao in the glaze drips defective product, you can not use the glaze dipping method, the method should be used to spray enamel, or enamel defects inevitable drips. Glaze with the glaze spray density of 1.75 ~ 1.80g/cm3, with a viscometer (100cm3, diameter 4mm) measured the density of 17 ~ 20s.
It should be noted that the glaze rheology (viscosity, fluidity, etc.) not only by glazing methods, but also by the different skills of the operator change. For example, workers with low skills has, glaze slurry viscosity should be larger.
Through these improvements, application of newly developed products, the appearance of the glaze to achieve a satisfactory result, even more than similar products in Italy.
