A cement-free magnesia castable and a method of using the same

By combining aluminum-based metal microcapsules with magnesia particles without cement binders, magnesium aluminum spinel whiskers/fibers are generated, which solves the problem of decreased high-temperature performance of magnesia castables, improves slag resistance and thermal shock resistance, and extends service life.

CN119191821BActive Publication Date: 2026-05-05WUHAN UNIV OF SCI & TECH +1
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Patent Information

Application Number
CN202411278868.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-09-12
Publication Date
2026-05-05
Estimated Expiration
2044-09-12

AI Technical Summary

Technical Problem

Existing magnesia castables exhibit performance degradation at high temperatures, exhibiting insufficient slag resistance and thermal shock resistance, and have a short service life.

Method used

A cement-free binder is used, with aluminum-based metal microcapsules as the binder. Metal nanoparticles and magnesium salts are deposited on the surface of aluminum powder or aluminum-based alloy powder to form aluminum-based metal microcapsules, which are then combined with magnesia particles. A water-reducing agent is added to form a network structure, which promotes the formation of magnesium aluminum spinel whiskers/fibers and improves high-temperature performance and slag erosion resistance.

Benefits of technology

It achieves high strength, slag erosion resistance and thermal shock resistance of magnesium castable at high temperatures, and extends service life, making it suitable for tundish and ladle applications.

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Abstract

This invention relates to the field of refractory materials technology, and more particularly to a cementless magnesia castable and its application method. The castable consists of aggregate, matrix material, and a water-reducing agent; the aggregate is 60-80 parts of magnesia particles; the matrix material is: fine magnesia powder, active α-Al₂O₃ micro powder, sintered corundum powder, silica micro powder, and aluminum-based metal microcapsules. The application method of the cementless magnesia castable is as follows: the water-reducing agent and matrix material are mixed evenly to obtain a premixed matrix material; the aggregate and premixed matrix material are stirred evenly, water is added and wet-mixed to obtain a slurry; the evenly mixed slurry is poured into a mold, vibrated to form the slurry, and then cured. This cementless magnesia castable exhibits certain initial strength, excellent high-temperature performance, excellent resistance to slag erosion and thermal shock, and a long service life, making it widely applicable in tundishes and ladles.
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