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Six use properties of magnesia carbon bricks for refractory materials

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Six use properties of magnesia carbon bricks for refractory materials

Date:2018-05-03 Author: Click:

Six use properties of magnesia carbon bricks for refractory materials

The performance of refractories is the performance of refractories when used at high temperatures. It includes refractoriness, load softening temperature, reburning line rate, thermal shock resistance, slag resistance and vacuum resistance.


(1) the degree of refractoriness

Refractoriness is the property that refractories do not melt when they are not loaded. They are used to characterize the properties of refractory materials against high temperature. Refractoriness is the basis for judging whether materials can be used as refractory materials. The international standardization organization stipulates that inorganic non-metallic materials with refractories above 1500 degrees are refractory materials. Refractoriness is different from melting point. Refractoriness cannot be used as refractory material.

(two) the softening temperature of the load

The softening temperature of the refractories is the temperature of a certain compression deformation under the joint action of a certain heavy load and heat load. It is an important indicator of the high temperature mechanical properties of refractory materials, which represents the stability of the refractory material under the joint action of heavy load and high temperature heat load. The deformation temperature of refractories at high temperature is an important quality index, because it shows the structural strength of the product to some extent under the similar conditions. The main factor determining the softening temperature of the load is the chemical mineral composition of the product, and is directly related to the production process of the product.

(three) reburning line change rate (high temperature volume stability)

The high temperature volume stability of refractories refers to the performance of the products when they are used at high temperature for a long time, and the shape and volume of the products are kept stable without permanent deformation. For sintered products, the rate of reburning rate or the rate of re burning line is usually measured by the weight of the product under no load. Reburning volume change is also called residual volume deformation, and the reburning line change is also called residual line deformation. The refiring deformation of the refractory products is of great significance to the stability of the products at high temperature, to ensure the stability of the masonry, to reduce the cracks in the masonry, to improve its sealing and corrosion resistance, and to avoid the damage of the masonry structure.

(four) thermal shock resistance

The thermal shock resistance is also called quench and hot resistance. It represents the ability of refractory products to resist rapid temperature changes without damage.

 

   

In practical work, refractory materials often suffer from a sharp change in temperature, and the working temperature varies greatly in a very short time. The sharp change of the temperature is called thermal shock. Thermal shock can cause cracks, spalling and collapse of refractory materials. Therefore, when the working temperature of refractories varies rapidly, the thermal shock resistance must be examined.

In order to improve the thermal shock resistance and avoid the crack of the material, it is necessary to improve the strength of the material, especially the tensile strength and shear strength, in order to improve the ability to resist the crack formation, and reduce the elastic modulus of the material and the Poisson's ratio, so as to reduce the possible thermal stress.

The price of magnesia carbon brick

 The price of magnesia carbon brick

(five) slag resistance

Slag resistance refers to the ability of refractory materials to resist slag erosion and erosion at high temperatures. The concept of slag here in the broad sense refers to the gold slag, fuel ash, fly dust, various materials and gaseous materials at the junction of the refractory material at high temperature.

(six) vacuum resistance

Generally, the steam pressure of refractory at room temperature is very low, which can be considered to be highly stable and non-volatile. But when working under high temperature and pressure, its volatility will become a problem that can not be ignored. It will cause losses due to its volatilization and accelerate its damage. Under such conditions, unlike vacuum at high temperature and normal atmospheric pressure, vacuum resistance is one of the important characteristics of refractories.


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