Definition and Application of Refractory Plastic
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2024-04-19
Refractory plastic is an amorphous refractory material composed of powdery and granular materials combined with binders and plasticizers such as plastic clay, with a small amount of water added. After thorough mixing, it forms a hard mud paste and maintains high plasticity for a long time.
Granular and powdered materials are the main components of plastic, generally accounting for about 70% to 85% of the total weight. They can be made from various refractory materials and are often classified and named according to their materials. Due to the fact that this amorphous refractory material is mainly used in various heating furnaces that do not directly come into contact with molten materials, clay clinker and high alumina clinker are generally used. Lightweight granular materials can be used to manufacture lightweight plastic materials. Sometimes, for certain special requirements, silica, sintered and fused corundum, chromium, silicon carbide, zircon, and carbon materials can also be used.
Plastic clay is an important component of plastics. Although it only accounts for 10% to 25% of the total amount of plastic, it has a significant impact on the bonding strength between plastic and its hardened body, as well as the plasticity of plastic and the volume stability and fire resistance of its hardened body. In a certain sense, it can be considered that the properties and quantity of clay determine the properties of plastic.
Application of plastic
Plastic does not require special techniques during construction. When used to make furnace linings, the plastic is taken out of a sealed container and placed between hanging bricks or hooks. It is then compacted in layers (each layer is 50-70mm thick) using a wooden hammer or air hammer to create the desired shape. When the plastic has not yet hardened, use repair tools to cut off the extruded residue, trim the shape, and perform surface processing. After repair, in order to facilitate the drainage of moisture, air holes are opened at regular intervals. Finally, leave expansion and contraction joints according to the design. If used to make an integral furnace cover, it can be constructed on the bottom mold first, dried, and then lifted.
Plastic is particularly suitable for various heating furnaces, soaking furnaces, annealing furnaces, carburizing furnaces in the steel industry. Hot air furnaces, sintering furnaces, etc. can also be used for cement rotary kilns, furnace covers of small electric arc furnaces, burners of high-temperature furnaces, and other similar parts. The temperature of use mainly varies depending on the quality of the granular and powdered materials used. Ordinary clay materials can be used at temperatures ranging from 1300 to 1400 ℃; High quality materials can be dried at 1400~1500C; High aluminum materials can be used at temperatures ranging from 1600 to 1700 ℃ or even higher; Chromium material can be used at 1500-1600 ℃.
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