The key role of magnesium hydroxide particlesize control in optimizing the performance of corundum-spinel materials

Magnesium hydroxide particle size has a significant impact on the structure and properties of corundum-spinel materials, which is specifically reflected in the following aspects:

1. Regulation of microstructure: The particle size of magnesium hydroxide directly affects the microstructure of the material. Smaller particle size can increase the specific surface area of the material, promote contact and reaction with other components, and help form a more uniform microstructure. This will not only affect the density of the material, but may also change the distribution of spinel phase and corundum phase, thereby optimizing the performance of the material.

2. Enhance the bonding force between phases: Fine magnesium hydroxide particles can be better embedded in the corundum-spinel matrix, enhancing the interfacial bonding force through physical or chemical bonding, and improving the overall strength and toughness of the material. The finer the particle size, the more obvious this enhancement effect is.

3. Behavior during heat treatment: During high-temperature sintering, magnesium hydroxide of different particle sizes will exhibit different reaction rates and phase transition behaviors. Fine-grained magnesium hydroxide is more likely to react completely at lower temperatures, which helps to form a denser structure, while larger-grained magnesium hydroxide may cause unreacted particles to remain inside the material, affecting the material's densification and final performance.

4. Influence of fire resistance: Changes in particle size will affect the fire resistance of the material. Small and evenly distributed magnesium hydroxide particles can effectively hinder heat transfer and gas phase diffusion, enhance the material's high temperature resistance and thermal shock resistance, especially when experiencing rapid temperature changes. Fine particles can provide more micro-crack buffers, reduce crack expansion, and improve the material's thermal shock resistance.

5. Adjustment of physical properties: Changes in particle size will also affect physical properties of the material, such as density, porosity, thermal conductivity, etc. Generally speaking, finer particle size helps to reduce the porosity of the material and increase the density, which is beneficial to enhance the mechanical properties and corrosion resistance of the material.

In summary, by regulating the particle size of magnesium hydroxide, the microstructure of corundum-spinel materials can be optimized to a certain extent, thereby improving their physical, chemical and mechanical properties to meet the needs of specific application fields. Therefore, in the process of material design and manufacturing, it is very important to select the appropriate particle size of magnesium hydroxide.