Zhong Tang (Dalian) Materials Co., Ltd
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Refractory binder, with the binder of different chemical properties, the bonding mechanism is also different. There are six typical combinations of mechanisms. In general, a binding agent has its specific binding mechanism, but sometimes there are several binding mechanisms exist at the same time, but there are primary and secondary points. This is very important for material design, and sometimes it is possible to meet special requirements through a combination of primary and secondary bonding mechanisms.
(1) hydration combined
With the binder at room temperature by hydration reaction with water to produce hydration products and produce binding. Such as all types of cement are through the combination of hydration mechanism and the material to produce strength.
(2) chemical combination
Binding occurs by virtue of the binding agent and the coagulant, or the chemical reaction between the binding agent and the refractory at room temperature, or the chemical reaction upon heating to produce a compound having a binding effect. Such as sodium silicate (sodium silicate) binder plus sodium fluoride coagulant, the reaction occurs to generate aqueous solution of SiO2: nH2O, dehydration to form a siloxane (Si-O-Si) network structure, resulting in a strong Combined action.
(3) condensation polymerization
With the addition of a catalyst or a crosslinking agent, the binding agent undergoes polycondensation to form a network-like structure to generate a bonding strength. Such as novolac plus methyltetramine in the heating conditions through the crosslinking reaction and condensation polymerization.
(4) Ceramic Bonding (Sintering Bonding)
In the refractory material can be added to reduce the sintering temperature of additives or metal powder to greatly reduce the temperature of the liquid phase to promote solid-liquid reaction at low temperatures to produce low, medium temperature sintering combination.
(5) Adhesion (adhesion) bonding
By means of the combination of one or more of the following several physical effects, binding occurs: one of its adsorption, including physisorption and chemisorption, relies on the intermolecular force of van der Waals interactions and the second is diffusion That is, under the action of the thermal movement of the material molecules, the mutual binding between the binding agent and the molecules to be bound occurs to form a diffusion layer on the interface to form a strong bond; and the third is the electrostatic interaction, that is, There are two layers of electrical interface at the junction of the objects, resulting from the electrostatic attraction of the electrical double layer.
By adding coagulant particles (colloidal particles) aggregation occurs to produce binding.
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