镁碳砖价格
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Introduction to the characteristics of magnesia carbon brick

Date:2018-05-03 Author: Click:

Flake graphite has the following characteristics


1. The melting point of high temperature resistant graphite is 3850℃±50℃, and the boiling point is 4250℃. Even if the price of magnesia carbon brick is burned by ultra-high arc, the quality loss is very small, and the linear expansion coefficient is also very small. The strength of graphite increases with the increase of temperature. At 2000℃, the strength of graphite doubles

镁碳砖价格

2. Electrical and thermal conductivity. The conductivity of graphite is twice as high as that of general non-metallic minerals. The thermal conductivity exceeds that of metal materials such as steel, iron, and lead. The thermal conductivity decreases as the temperature increases, and even at extremely high temperatures, graphite acts as an insulator.


3. Lubricity. The lubricity of graphite depends on the size of the graphite flakes. The larger the flakes, the smaller the friction coefficient and the better the lubrication performance.


4. Chemical stability, graphite has good chemical stability at room temperature, and is resistant to acids, alkalis, and organic solvents.


5. Plasticity. Graphite is very tough and can be rolled into very thin flakes.


6. Thermal shock resistance. Graphite can withstand drastic changes in temperature without being damaged when used at high temperatures. When the temperature changes suddenly, the volume of graphite will not change much and no cracks will occur.


The binding agent plays the role of connecting the matrix and the particles. In the actual production and use process, the matrix and the binding agent system are the two weak links of the magnesia carbon brick.


The requirements for the bonding agent in the production of magnesia carbon bricks are:


1. It has a certain viscosity and fluidity at room temperature, and has good wettability to magnesia and graphite


2. The bonding agent can further condense during the heat treatment process, so that the product has higher strength


3. During the heat treatment, the bonding agent does not cause excessive expansion and contraction of the product to avoid cracking of the product


4. The C content should be high, and the carbon polymer after the coking treatment has good high temperature strength


Generally, the binders used in the production of magnesia carbon bricks include coal tar pitch, coal tar, special carbon resins, polyols, pitch denatured phenolic resins, synthetic phenolic resins, etc.


Antioxidants


The excellent performance of magnesia-carbon bricks depends on the presence of carbon in the bricks. The oxidation of carbon during its use can easily cause deterioration of the product structure, causing slag to penetrate into the bricks along the gaps, corroding magnesia particles, and reducing the service life of the magnesia-carbon bricks. At present, the oxidation resistance of magnesia carbon bricks is mainly improved by adding antioxidants.


Principles for choosing antioxidants


1. Determine the possible condensed phase and the vapor pressure of each gas phase based on thermodynamic data and use conditions


2. Compare the affinity of each condensed phase with oxygen and the possibility of CO reaction.


3. Analyze the influence of various reactions on the microstructure of bricks

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