In-situ generated CM2A8 multiphase reinforced steel ladle casting material and preparation method thereof

Abstract

The invention relates to an in-situ generated CM2A8 multiphase reinforced steel ladle casting material and a preparation method thereof. The technical scheme comprises that the composition and content of the steel ladle casting material comprise that 65-80 wt% of modified corundum particles is used as an aggregate, 6-10 wt% of a white corundum powder, 2-6 wt% of a magnesia fine powder, 6-8 wt% of an active alpha-Al2O3 micro-powder, 5-8 wt% of calcium aluminate cement and 0.5-3 wt% of a magnesium aluminate spinel fiber are used as a matrix material, and 0.05-0.06 wt% of organic fibers, 0.1-0.3 wt% of a water reducer, 0.02-0.04 wt% of an aluminum silicon alloy powder and 0.1-1 wt% of a rare earth oxide are added according to the sum of the amounts of the aggregate and the matrix material. The preparation method comprises the steps: firstly, dry-mixing the matrix material with the water reducer, the aluminum silicon alloy powder and the rare earth oxide, then adding the aggregate and the organic fibers, dry-mixing, finally, adding water, stirring, pouring and molding, drying, demoulding, and thus obtaining the in-situ generated CM2A8 multiphase reinforced steel ladle casting material. The prepared product has the characteristics of high medium-high temperature strength, good thermal shock stability and excellent slag resistance.

Description

technical field [0001] The invention belongs to the technical field of ladle castables. Specifically related to an in situ generation of CM 2 A 8 Multi-phase reinforced ladle castable and preparation method thereof. [0002] technical background [0003] The development of high-speed rail, deep sea, and aviation technology has put forward higher requirements for steel quality. In the process of high-quality steel smelting, the application of stirring, vacuum, and external electromagnetic field technology has made the service conditions of refractory materials for ladles more stringent. Requirements It is necessary to achieve longevity without polluting molten steel, and to save energy and reduce consumption. At present, castables for ladles are mainly low-cement corundum-spinel or aluminum-magnesium castables, which have poor thermal shock stability and low medium-temperature strength, which affects their service life. [0004] In order to improve the thermal shock stabil...

AI Technical Summary

Problems solved by technology

At present, the castables for ladles are mainly low-cement corundum-spinel or aluminum-magnesium castables, which have poor thermal shock stability and low medium temperature strength, which affect their service life.

[0004] In order to improve the thermal shock stability of castables for ladles, "a castable for ladles" (CN104926335A) uses sintered microporous aluminum spinel as aggregate. Although the thermal shock stability of the castables is improved, its resistance to Slag properties and strength are affected

"An explosion-proof low-cement castable" (CN103253946) was fired at 1500°C, and the compressive strength was significantly improved. However, at 1000°C, the bond strength was lost due to dehydration of the binder, and the raw materials did not sinter, so that the medium-temperature strength of the castable was reduced.

In order to improve the slag resistance of the ladle castable, "a corundum magnesium aluminum spinel castable and a method for preparing prefabricated bricks using the castable" (CN103482989A) is improved by introducing spinel particles and spinel micropowder into the castable. The slag resistance of the castable, but due to the uneven dispersion of the introduced spinel powder, its slag resistance has not been fundamentally improved

"Corundum-spinel castables containing nano-magnesium carbonate" (CN101508587) introduces dolomite into the raw materials and reacts in situ to generate spinels to improve the slag resistance of the castables. There is a volume expansion of 7%, which not only affects the strength of the castable, but also greatly affects the slag resistance and thermal shock stability

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