With the increase of aluminum additives, the oxidation resistance and flexural strength of the refractories are also improved. Using the dynamic method and the static method as the comparative tests, the evaluation of the corrosion resistance of refractory materials without metallic aluminum and added metal aluminum or aluminum-magnesium alloys shows that the best result in these two cases is the addition of aluminum-magnesium alloy samples. . Because of the additive's reaction with the iron oxide in the slag (static method), the oxidation rate of carbon is reduced, and the corrosion resistance of the refractory material is increased due to its structural enhancement (dynamic method). Experts from Rizhao Asahi Glass successfully developed compound anti-oxidants: aluminum and composites. The studies carried out show that due to the marked increase in the volume of the product, the density of the structure is increased and the pores are closed. The resulting BZO: converts to MeO-BZO, a type compound, and forms a liquid phase at high temperatures, thereby protecting the refractory material from oxidation. The effect of additives on the oxidation resistance of refractories was studied in Japan.
When the amount of additive B4C is more than 0.5%, the oxidation resistance of the material can be significantly improved, and the solubility of Meo in the slag can be limited. Resorcinol oligomer-based thermosetting resins are used as bonding agents for high residual carbons and good process properties. The test was conducted using a magnesium carbon refractories containing no antioxidant and having a graphite material content of 5% to 12%. Based on the results obtained, the current work is to study the effect of antioxidants on the performance of magnesium carbon and aluminum magnesium carbon refractories with resorcinol oligomers as binders.
In order to increase the strength of the refractory, an additional chemical hardening agent, hexamethylenetetramine (Urotropine), was added to the ny3 formulation. The addition of such a hardener facilitates the reinforcement of the thermosetting resin structure. Refractory sample decarburization degree. Each sample was placed in a collapsed corundum, covered with a lid, heated to 120°C in an electric furnace equipped with a silicon carbide heating element, and the ingredients were mixed dry with graphite and binder in a blender. Sh, pre-add antioxidants to the binder, which is added in proportion to the refractory material.
The strength index of the fireproof coating of the steel structure with the antioxidant magnesium carbon sample is slightly lower than the same index without the antioxidant sample. It is likely that the metal aluminum is not fully wetted by the binder. It should be noted that the sample contains a large amount of graphite and graphite is not easily wetted by the resorcinol oligomer used as a binder. These factors can affect the strength of the refractory material. In spite of this, the obtained compressive strength values ​​are sufficient to ensure the required serviceability of the refractory material. Open porosity is not greater than 10.9%. Only a small amount of resorcinol oligomer can significantly increase the strength of the refractory material. This is because the addition of the additional methylene group, urotropine, promotes the polymerization of the resorcinol resin and increases its structural strength. Samples containing chemical hardeners have a compressive strength of 52.6-56.SMPa, and only 7% resorcinol oligomers are required to achieve such high strength. The open porosity of this sample is 8.2%-8.5%, especially the composition of the sample has the best strength characteristics. In the manufacture of aluminum-magnesium refractories, only the particle composition of the bauxite in the batch is changed, and the amount of graphite added is 10%.
It should be noted that for magnesia refractories, the optimum amount of binder is 7%, while the binder-resorcinol oligomer addition is 7% for a variety of aluminum magnesium carbon refractories ( Plus). In order to make aluminum magnesium carbon refractories samples, a binder with 3% chemical hardener was added. In order to obtain a sample with a density higher than 2.869/c after molding, changing the particle composition of the formulation has no significant effect on the density of the molded sample. When the sample density is not less than 2.809/c, the open porosity of the sample is not higher than 13.7%. The compressive strength is 47.6-59.OMPa. In this case the strength is best composed of Anyl ingredients. The effect of antioxidants on the degree of decarburization during the heating of refractory samples was studied. The results show that adding aluminum to the composition of refractory ingredients can significantly reduce the degree of carbon burning.
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