Composite powder for improving scouring resistance of carbon-containing refractory material and preparation method of composite powder

Abstract

The invention belongs to the technical field of preparation of carbon-containing refractory material, and mainly relates to composite powder for improving scouring resistance of a carbon-containing refractory material and a preparation method of the composite powder. The provided composite powder for improving the scouring resistance of the carbon-containing refractory material is compounded from zirconium carbide particles and nano zirconium oxide, wherein the mass ratio of the nano zirconium oxide to the zirconium carbide particles in the composite powder is 0.5:1 to 1:0.5; the particle size of the zirconium carbide particles is 200-400 meshes, and the zirconium carbide particles are positioned in the center of the composite powder; the nano zirconium oxide is part of stable zirconium oxide of which the particle size is less than 30nm; the nano zirconium oxide is uniformly dispersed and is enwrapped on the outer surface of the zirconium carbide particles; and the particle size of the composite powder is between 80 meshes and 150 meshes. The composite powder provided by the invention ensures that zirconium oxide has strong adhesive force on the surface of zirconium carbide, and meanwhile, and the composite powder is crushed after drying to obtain an appropriate particle size, and finally obtain the nano zirconium oxide coated zirconium carbide composite powder.

Description

technical field [0001] The invention belongs to the technical field of preparation of carbon-containing refractory materials, and mainly relates to a composite powder for improving the anti-scouring performance of carbon-containing refractory materials and a preparation method thereof. Background technique [0002] Carbon-containing refractory materials are widely used in the continuous casting industrial process, among which the application of the three major parts of continuous casting is the most common. The structure is loose, and it is difficult to resist the erosion of molten steel and the penetration and erosion of molten slag. For this reason, antioxidants are introduced into carbon-containing refractories in large quantities. Current anti-oxidation additives generally contain boron, silicon and other substances, such as patent ZL200810011972.5 containing boron The oxidation products of antioxidants exist in liquid phase, and the oxidation products of silicon-contain...

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Problems solved by technology

[0002] Carbon-containing refractory materials are widely used in the continuous casting industrial process, among which the application of the three major parts of continuous casting is the most common. The structure is loose, and it is difficult to resist the erosion of molten steel and the penetration and erosion of molten slag. For this reason, antioxidants are introduced into carbon-containing refractories in large quantities. Current anti-oxidation additives generally contain boron, silicon and other substances, such as patent ZL200810011972.5 containing boron The oxidation products of antioxidants exist in liquid phase, and the oxidation products of silicon-containing antioxidants described in ZL200910066119.8 have poor erosion and erosion resistance

[0003] Zirconium carbide is a relatively common substance in carbide materials. It has many excellent characteristics of carbonaceous materials and can be used as an anti-oxidation additive for carbon-containing refractory materials. Its oxidation temperature in air is lower than that of resin carbon oxidation. Oxidation product ZrO 2 High temperature performance is good, however, in an aerobic atmosphere, as the temperature rises, ZrC particles will be violently oxidized, which will cause volume expansion and cracking of the particles, making the loose decarburized layer more fragile and reducing its resistance. Erosion and erosion ability of molten steel

[0004] The main function of the existing zirconium carbide as an antioxidant is to be able to oxidize before carbon. However, due to the volume effect of the oxidation reaction, it is easy to cause the structure of the product to be loose and weaken the anti-scourability of the product.