What type of ramming material is used in industrial casting?

Ramming material is a commonly used production material in the production of foundry industry. For this type of material, non-industry people, or those who have just entered the industry, may not know his relevant information very well. Here, the editor will give you a specific introduction. Help everyone to know more about ladle casting materials and other materials.

The refractory ramming material is made of a high proportion of granular materials and a very low proportion of binders and other components, and even all of them are composed of granular and powdery materials. Because the ramming material is mainly used for the parts in direct contact with the molten material, it is required that the granular and powdery materials must have high volume stability, fineness and corrosion resistance, and those used in induction furnaces should also have insulation.

The selection of the binder for the ramming material should be appropriate, some do not need a binder, and some only add a small amount of flux. Acid ramming materials are commonly used as binders such as sodium silicate, ethyl silicate, silica gel, etc. Among them, dry ramming materials use boron. Alkaline ramming materials commonly used magnesium chloride salts and sulfates, etc.; also often use high carbon-containing organics and temporary binders that can form carbon bonds at high temperatures. Among them, dry ramming materials add Appropriate amount of iron-containing flux. Chromium ramming material is commonly used as a pin.

Compared with other unshaped refractories of the same raw material, the ramming material is in a dry or semi-dry loose state, and a dense structure is obtained by vigorous ramming. Only when it is heated to the sintering temperature, the combination will have strength. The ramming material is formed After that, according to the hardening characteristics of the mixture, different heating methods can be adopted to promote its hardening or sintering.

After the material is subjected to external force, it deforms without cracks. After the external force is removed, the deformed shape remains and does not return to its original state. The function is called plasticity. Plasticity is an important molding process index for combining clay. function, specific surface area and water absorption.