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What do you know about the bonding mechanism of refractory binders

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What do you know about the bonding mechanism of refractory binders

Date of release:2019-06-09 Author: Click:

The bonds commonly used in refractories have different chemical properties and binding mechanisms. There are six typical binding mechanisms. Generally speaking, a kind of binder has its specific binding mechanism, but sometimes several binding mechanisms exist at the same time, but there are only primary and secondary differences. This is very important for material design. Sometimes special requirements can be achieved through different binding mechanisms of various binders. Dry material

One: Hydration Combination


By means of the hydration reaction between the binder and water at room temperature, the hydration product is formed and the binding effect is produced. For example, all kinds of cement are bonded through hydration bonding mechanism and make the material produce strength.


II: Chemical Combination


The bond is formed by chemical reaction between binder and coagulant accelerator, or between binder and refractory at room temperature, or by chemical reaction when heated to form binding compounds. For example, when sodium silicate (sodium silicate) binder is added with sodium fluorosilicate coagulant, the reaction occurs to produce water solution Si O 2:nH 2, which is dehydrated to form a network structure of silicone (Si-O-Si), thus producing a strong binding effect.

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III: Polycondensation


By adding catalyst or crosslinking agent, the binder can be condensed to form a network structure and the bonding strength can be obtained. For example, linear phenolic resin and methyltetramine can produce polycondensation bonding through crosslinking reaction under heating conditions.


IV: Ceramic Bonding (Sintering Bonding)


Adding additives or metal powders to refractories to reduce sintering temperature can greatly reduce the temperature of liquid phase and promote solid-liquid reaction at low temperature to produce low and medium temperature sintering bonding.


Five: Adhesive (Adhesive) Binding


The binding is produced by the superposition of one or more of the following physical actions: one is adsorption, including physical adsorption and chemical aspiration, which depends on the interaction between molecules-van der Waals force; the other is diffusion, i.e., the binding agent and the molecule to be bound under the action of the thermal movement of the molecule of the substance. The interaction of diffusion occurs, forming a diffusion layer on the interface, thus forming a solid bond; the third is electrostatic interaction, that is, there is a double layer at the interface between the binder and the bonded material, which is formed by the electrostatic attraction of the double layer.


Sixth: cohesive bonding


The coagulation of particles (colloidal particles) occurs by adding coagulants. Colloidal binders and pastes prepared from ultrafine powders have this binding mechanism.


This is the common bonding mechanism of refractories. In the actual production of refractories, the bonding mechanism in the refractory green body is often not single, sometimes it is the superposition of several bonding mechanisms or different bonding mechanisms at different temperature stages.


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