Relationship between quality of aluminum foil wool and […]
Relationship between quality of aluminum foil wool and pinholes From the quality of internal aluminum foil wool, imported wool is generally a compound, mainly β and α phases of FeSiA, but domestic aluminum foil wool is mainly dominated by FeSiAa phase and FeAl3. Compound. The a phase of FeSiA is a relatively ideal compound, which is very easy to be broken. FeAl3 belongs to the coarse compound phase, which is the main factor leading to the number of pinholes.
Since it has a double-zero aluminum foil thickness of 6~7um, as long as it is a second direction larger than 5um. Pinholes will appear, but the smaller the crystal grains, the better. The grain size less than 1um will increase the work hardening rate, which will increase the deformation resistance and reduce the plastic deformation ability. Pinholes are very prone to occur, so it is necessary to appropriately control the size of the aluminum foil wool compound to be between 1 and 5 μm.
The effect of aluminum foil wool silicon and iron content on the number of pinholes in aluminum foil. If there is a relatively high silicon and iron content in the aluminum foil wool, it will increase the solid solution iron and silicon content, especially the relatively high solid solution. When the silicon content is increased, the degree of work hardening is increased, and the deformation and anti-stress are increased. When the aluminum foil is produced, if it is relatively thin, a certain number of pinholes is increased. Fully analyze the rolling property of the aluminum foil, it is more suitable to use the 1235-H14 type aluminum alloy, and the content of Fe is larger than Si, and the ratio of the two is between 2.0 and 3.5, and it is generally suitable to select the Si content of 0.08 to 0.15%.
The effect of hydrogen remaining in the crystal. When there is more hydrogen in the aluminum foil wool, a certain amount of sand holes or bubbles will be formed, which will affect the pinhole porosity and processing performance of the processed aluminum foil material to a certain extent. When the aluminum foil with a relatively large thickness is rolled, it will not appear. Pinholes, but when rolling double zero aluminum foil, hydrogen is formed to cause pinholes. Therefore, during the rolling process, the hydrogen content should be strictly controlled, and the suitable value is 0.08~0.12mL/100g.