Ways to Prevent the Enamel Fish Scale
In general, the type of steel plate, the choice of enamel frit and the humidity of the production environment are the main factors affecting the fish scale explosion of enamel. To eliminate fish scales, we must work hard in the above three aspects. However, many factories consider the cost and other factors, or the processing of enamel products in the form of OEM. At this time, the choice of steel plate or enamel is subject to actual conditions. So is there any other way to control the enamel fish scale explosion? The practice has proved that by properly adjusting the firing and ball milling process in the enamel production process, and appropriately adjusting the mill additive composition of the enamel slip, it also has a certain effect on overcoming the enamel fish scale explosion.
1. Adjusting the enamel firing process
Because the solubility of the iron body to hydrogen increases exponentially with increasing temperature, it does not increase linearly. It has been tested that a hot-rolled plate with an extremely severe fish scale explosion is fired below 700 ° C, and it is found that there is no fish scale explosion at all. This shows that low-temperature long-burning has a certain effect on the production of fish scales from enamel.
2. Adjusting the ball milling process
This is because different particle sizes melt at different speeds and times at higher temperatures, thicker enamels have a longer melting time, and different particle ratios are advantageous for increasing the firing range and avoiding the "burning" of the enamel.
3. Adjust the composition of the mill additive
Appropriate adjustment of the proportion of the mill additive on the slip has three main functions: one is to grind refractory materials such as quartz, alumina, and zircon. Because these materials have a higher melting point, they will melt later than the enamel, thereby increasing the exhaust passage of the porcelain layer; the second is to increase the porosity of the porcelain layer and increase the hydrogen storage capacity of the enamel layer. These types of grinding materials include carbonates and nitrates; the third is to change the surface structure of the iron body, increase the hydrogen storage capacity of the iron body and the adhesion of the porcelain layer. These types of grinding materials include nickel oxide, anti-explosive agents, etc.
On the whole, the enamel frit manufacturer Nolifrit recommends that the enamel processing plant choose a more suitable steel plate for enamel to anti-fish scale, and the process adjustment can only control the fish scale explosion to a certain extent. Once encountering different steel plates and production environments, the enamel fish scale explosion is likely to reappear. At this time, it is necessary to make new adjustments to the process, which is not a small task for the factory.