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ceramic branding mugs cup How to use glaze cracks

Ceramic Mug    From:Xinxiang Ceramic Mug Manufacturers    
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custom sublimation ceramic mug branding cup

Balanced force between the glaze layer and the body is to ensure that the glaze has a key blank and a good combination of high strength condition. During firing, the glaze melts and gradually penetrate into the surface of the blank, between the intermediate body and the glaze layer. In accordance with the composition of the glaze, the middle layer and the body and glaze are not the same, but have some common characteristics glaze and blanks. Passing a finished product, the expansion between the glaze which is almost equal. If the glaze such as sodium, potassium, such a class tend to cause high levels of expansion of the flux is large, then a large expansion of the glaze phenomenon occurs when molten, and when cool the glaze layer so that the flux ratio of the green body shrink even more intense. This excessive tensile stress can make fine hair appear glazed as cracks, and this crack will extend rapidly expand in the pottery surface. This is not good for vitrified pottery extent, it is a very serious flaw. Because the water is sucked into the body along the crack, families with such pottery is unsanitary. The way to overcome is to improve the unglazed temperature, thereby reducing the porosity of the product. Crack glazed stoneware from the health point of view, though not seem so important, however, to note that these cracks can severely affect the strength of stoneware. Take plywood for comparison, the case where the two layers together is significantly larger than the strength of a layer. If there is a layer of cracked or broken, another layer of strength will be severely reduced. Pottery frequently used operations more frequently, cracking even more is a defect.

But on some used to decorate the vase, it made good use of this defect. The famous Chinese potters pattern piece glaze is a pioneering use of crack defects. Depending on the different positions of the glaze and the blanks in the furnace, and can obtain different effects of cracks. If the coat coloring oxides in the glaze, crackle glaze effects appear to be more clear. For connoisseurs, it is important to the appearance of cracks in the porcelain. When the flow of a defect as a crack, it is necessary to increase the consistency of the glaze to prevent the melted glaze. Materials may be appropriate to increase the low expansion coefficient for a corresponding factor instead of having a high coefficient of expansion of the basic flux. A low coefficient of expansion material magnesium oxide, lithium oxide, and quartz. Especially meaningful is to add a small amount of talc in the glaze.

In addition, you can try to burn at different temperatures, a little bit lower or higher. People can also add the right amount of boron in the glaze, such as boric acid and calcium, all help to overcome cracking defects.
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