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Ways to improve the thermal shock resistance of refractories

2020-10-14 08:28:59

1. Reduce the thermal stress caused by expansion: The kiln furniture is made of materials with a small thermal expansion coefficient, or some materials with a small thermal expansion coefficient are mixed in the kiln furniture, which can reduce the thermal expansion of the crystal phase, thereby reducing the thermal stress. Light burnt magnesia powder


In addition, when the main crystal phase inside the kiln furniture is heated and expanded, if there is a certain space inside the structure that can accommodate a certain degree of deformation, it can play a role in relieving thermal stress.


The main methods are:


(1) Introduce materials with low expansion coefficients.


(2) A large number of micro air holes are set in the kiln furniture.


(3) Introduce a negative expansion mechanism.


2. Formation of a micro-crack network: Micro-cracks contribute to increasing the fracture surface energy of the material. These cracks absorb elastic strain energy and reduce the energy that drives the main crack to expand, thereby increasing the fracture surface energy of the material.

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In addition, these microcracks also contribute to reducing the elastic modulus of the material, which not only increases the fracture surface energy, but also reduces the elastic modulus, which can improve the thermal shock resistance of the material.


The main methods are:


(1) Extremely matched control particles.


(2) Thermal expansion mismatch.


What is the basic principle of slag splashing furnace protection technology?


Answer: The basic principle of slag splash protection technology. Magnesia carbon bricks for electric furnaces are used to adjust the remaining end slag composition after the converter is tapped, and use the end slag whose MgO content reaches saturation or supersaturation. The surface of the furnace lining forms a layer of high melting point splashing slag that adheres well to the furnace lining, as shown in Figure 2-1. This slag splash layer has better corrosion resistance and can reduce the mechanical erosion of the furnace lining during the steelmaking process, thereby protecting the furnace lining bricks, slowing down their damage, and increasing the life of the furnace lining.

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Yingkou Dingfeng Metallurgical Technology Co., Ltd.

18041722333

Contact: Mr. Zhang

Telephone: 18041722333

Mail box: 810678900@qq.com

Address: Liangjunzhai Village, Yong'an Town, Dashiqiao City, Yingkou City, Liaoning Province

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