Nanotechnology improves the thermal shock resistance of low-carbon magnesium-carbon refractory materials

 In addition to good slag resistance, low-carbon magnesia-carbon refractories also require products with a certain degree of thermal shock resistance. This is due to the sharp decline in thermal shock resistance due to the reduction of carbon content. Thermal shock resistance is not only an important index to measure refractory materials, but also a key research direction in the low-carbon use of magnesia-carbon bricks.

Nano powder particles have the characteristics of small size, large surface energy and large dispersion, which are conducive to the relative slip between particles and can improve their thermal shock resistance. Therefore, the use of nanotechnology to improve the thermal shock resistance of low-carbon magnesium-carbon refractories has attracted much attention. The use of nanotechnology to improve the thermal shock resistance of low-carbon magnesium-carbon refractories is essentially to increase the fracture toughness of the material. The microstructure of the material can be adjusted to further increase the crack propagation resistance of the material. There are two main toughening methods for low-carbon magnesium-carbon refractories.

(1) Crack deflection toughening, nano-powders are introduced in the form of refractory raw materials or additives, and the introduced nano-powders are dispersed and distributed in or between particles. A large number of sub-interfaces are formed and play a role in pinning dislocations, making the crack propagation path more tortuous, extending the crack propagation path, resulting in an increase in the ability of the crack to be consumed during the propagation process, and an increase in the fracture toughness of the material.

(2) Crack bridging and toughening, introducing nanoparticles into the refractory aggregates can form bridging components of fibers, whiskers and ceramic phases in situ. When larger bridging components are encountered in the process of crack propagation, their existence is relatively high. The bridge connecting element is equivalent to erecting a bridge between two opposing crack surfaces, which increases the resistance of crack propagation. If the cracks continue to expand further, the bridging component is destroyed by pulling out from the matrix. This pulling out process will consume a lot of energy and increase the fracture toughness of the product, thereby improving its thermal shock resistance.

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Article Source：Nanotechnology improves the thermal shock resistance of low-carbon magnesium-carbon refractory materials
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