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Effect of raw material type and particle size on the performance of thermal insulation materials
The performance of insulation materials is significantly affected by the type of raw material. Different raw materials have different thermal conductivity, thermal expansion coefficient and chemical stability, which will affect its performance.
For example, some raw materials have lower thermal conductivity, so that insulation materials prepared from these raw materials have better thermal insulation properties. The thermal expansion coefficient of other raw materials is relatively high, which may cause it to deform greatly when the temperature changes, thus affecting its stability.
In addition, the chemical stability of the raw materials is also crucial. Certain raw materials are prone to decomposition or reaction under high temperatures or chemically corrosive environments, which not only reduces performance but may also cause safety hazards. Therefore, when selecting raw materials for thermal insulation materials, factors such as thermal conductivity, thermal expansion coefficient, and chemical stability need to be comprehensively considered.
Effect of granularity
Particle size is another important factor affecting the performance of insulation materials. The size of the particles not only affects the porosity of the material, but also affects its thermal conductivity.
Generally speaking, smaller particle sizes result in higher porosity, thereby improving its thermal insulation properties. Because the higher the porosity, the more air there is in the material, and air is a poor conductor of heat and helps slow down the transfer of heat.
However, too small a particle size may also result in increased thermal conductivity of the material. Because the smaller the particle size, the less solid part of the material, and the solid part is the main way of heat conduction. Therefore, when selecting the particle size, a balance point needs to be found to ensure that the porosity is high enough while avoiding excessive thermal conductivity.
In summary, the type and particle size of raw materials have a significant impact on the performance of thermal insulation materials. During preparation, it is necessary to comprehensively consider the selection of raw material types and particle sizes according to specific application scenarios and needs to obtain the best thermal insulation effect.