Plasticity of refractory clay
The material deforms but does not rupture after being subjected to external force. When the external force applied to deform it is removed, the deformed shape remains and does not return to its original state. This property is called the plasticity of the material. Plasticity is an important property of the refractory clay mass that can be controlled to form the desired shape.
When refractory clay and water are mixed to form plastic clay, there is an appropriate amount of water added to make it the best plasticity, which is called the maximum plastic water, which is equivalent to the percentage of reconciled water in the critical state of stickiness and non-stickiness. .
The strength of plasticity is generally measured by the moisture content (ie, plastic moisture) when the plasticity reaches the maximum value. The plasticity level is also represented by the plasticity index. The plasticity index is expressed by the product of the deformation force and the diameter of the mud ball before the test and the height difference after the test (to the beginning of the first crack).
The plasticity of refractory clay depends on the mineral composition of the clay, the fineness and number of particles, and the properties of the liquid phase. With kaolinite as the main mineral and fine-grained adhesion, its plasticity is good. Blending with glycerol or its aqueous solution can make the clay more plastic than when blending with water, on the contrary, blending with kerosene, gasoline and clay cannot obtain plasticity.
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