Nano magnesium oxide is a fairly common alkaline oxide. Due to its high melting point of 2800°C and some special and excellent properties, it can be used in the advanced ceramic field. In terms of application, it can be divided into two ways: direct sintering into ceramics and use as a sintering aid for other ceramics.
Direct sintering into ceramics
Nano magnesium oxide is an excellent ceramic raw material. Because of its good heat resistance and strong resistance to erosion by alkaline metal solutions, magnesium oxide ceramics are often suitable for high temperature environments. It can be used as a crucible for smelting metals, and in the atomic energy industry it is also suitable for smelting high-purity uranium and thorium. It can also be used as a protective sleeve for thermocouples. Because it has the property of allowing electromagnetic waves to pass through, it can be used as a radar cover and projection window material for infrared radiation. It is also a raw material for piezoelectric and superconducting materials, and is environmentally friendly and resistant to lead corrosion. It can also be used as a ceramic sintering carrier, especially for the sintering protection of ceramic products such as β-Al2O3 that have corrosive and volatile substances at high temperatures.
Used as a sintering aid for other ceramics
Nano magnesium oxide can also be added to the preparation process of other ceramics, which has a good effect on reducing the glass transition temperature, lowering the sintering temperature, and improving the optical and mechanical properties of ceramics, thereby helping us obtain higher quality ceramic materials.
For example, silicon nitride ceramics have become one of the most promising high-temperature structural materials due to their excellent high-temperature strength, thermal shock resistance, and chemical stability. However, its strong covalent bond and low diffusion coefficient make it difficult to sinter densification. The addition of magnesium oxide can react with the silica on the surface of the silicon nitride powder during sintering to form silicate liquid phase, which can effectively promote the sintering of silicon nitride ceramics. At present, MgO-Y2O3 composite sintering aids are generally used to achieve atmospheric pressure sintering of silicon nitride ceramics.
In summary, nano magnesium oxide plays a vital role in the ceramic field. It can act as a basic material or additive to improve the performance and functionality of ceramics, thereby promoting the progress and development of the ceramic industry.
Post time: Jul-14-2023