What is the Application of Sericite Mica in the Electrode Industry?

As a Mica Factory, share with you. E4303 and E4313 welding electrodes are the leading products in China's welding materials, accounting for about 80% of the total electrode production. In recent years, the electrode industry is looking for ways to use titanium dioxide or reduce the use of rutile and other high-quality raw materials to reduce production costs. Sepiolite, white mud, pyrophyllite and other non-metallic aluminosilicates are used in The E4303 and E4313 electrodes have achieved certain results, but they do not have good slip and plasticity. The overall performance of Sericite Mica is much better, which helps to improve the quality of E4303 and E4313 welding electrodes.

Sericite Mica

1. Sericite is a layered sheet aluminum potassium silicate with the structural formula of KAl2 [Si3AlO10] (OH, F). The chemical composition of sericite suitable for the electrode industry is as follows:

Chemical composition SiO2 AI2O3 K2O H2O S P

Content (%) 50-60 25-30 7-11 ≤5 ≤0.03 ≤0.03

2. Sericite application functions and features:

Compared with sepiolite, white mud, pyrophyllite, sericite has higher K2O content (pyrophyllite, 7.41%; sericite, 7.5-11%; white mud, sepiolite does not contain K2O), so it has The low ionization potential helps to provide conductive ions during the arc combustion process and stabilize the arc combustion.

Sericite's low S and P impurity content (S content 0.015-0.018%) is beneficial to reduce S and P in deposited metal, reduce its cracking tendency, and improve crack resistance.

Low water swelling rate (pyrophyllite, 70.5%; sepiolite, 5.2%; titanium dioxide, 32.6%; sericite, 4.3%), which is beneficial for reducing electrode coating cracks.

Low adsorption water content (after baking at 110 ℃ × 2h, the water content is: pyrophyllite, 1.8%; white clay, 5.2%; sepiolite, 5.8%; titanium dioxide, 2.4%; sericite, 2.5%), It can improve its moisture resistance, reduce the diffusible hydrogen content in the deposited metal, reduce the porosity sensitivity, and improve the level of X-ray scratching the negative.

Because it is in the form of fine scales, it has a certain elasticity and plasticity, which can increase the slip of the electrode coating and the fluidity in the powder cylinder and improve its pressure coating performance.

The sericite has a uniform particle size distribution, does not contain large particles of foreign impurities, and does not cause blasting when the arc is burned, thus reducing splashes and reducing the sound of combustion.

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