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Effect of particle size of magnesia chrome brick, magnesia brick wholesale of magnesia MgO-C refractory oxidation rate
Microstructure has a certain effect on the oxidation rate of magnesia carbon refractories under low pressure such as ladle, converter and decarburization plant. Therefore, it is very helpful to study the microstructure of these magnesia carbon refractories to improve their oxidation resistance. In the Japanese foundry and forging company, the oxidation rate of cubic carbon blocks of magnesia carbon refractories was precisely determined by phase equilibrium. The relationship between the maximum particle size of magnesia and the oxidation rate of magnesia carbon refractories was studied.
Experiment with cubic specimens (20 x 20 x 20mm) provided by Kurosaki harima. The chemical composition and particle size distribution of the sample are as follows.
The experiments were carried out under the oxygen partial pressure of 3.7 x 102Pa and 2.1 x 104Pa respectively. The temperature is between 1200 and 1400. The oxidation process is carried out according to the local reaction of a simulated oxidation process, and the oxidation rate is analyzed by the weight loss of the sample. The experimental results show that oxygen diffuses through the pores in the decarburization layer. When the partial pressure of oxygen is 2.1 * 104Pa, the effective diffusion rate of oxygen in M5-3 (magnesia maximum particle size 3.0mm) is slightly lower than that in M5-1 (the largest particle size of magnesia is 1.0mm). The effective diffusivity of oxygen in M5-3 and M5-1 decreased significantly at 1400 C. The dense layer was found in the decarburization layer by optical microscope. It may be because the pore channel of M5-3 is more tortuous than that of M5-1, and M5-3 sample is easier to form dense layer than M5-1 sample.