A dry refractory composition with excellent crack propagation resistance

By combining modified stainless steel fibers with modified ammonium polyphosphate and nano-alumina, the problem of crack intensification in dry refractory materials at high temperatures was solved, achieving excellent crack propagation resistance and high-temperature stability.

CN122102720BActive Publication Date: 2026-07-17LIAONING MINGXUAN NEW MATERIAL TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
LIAONING MINGXUAN NEW MATERIAL TECH CO LTD
Filing Date
2026-04-28
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

The existing dry refractory materials suffer from the problem of metal fiber oxidation at high temperatures, which further exacerbates cracking. Traditional stainless steel fibers oxidize to form oxides in the temperature range of 800-1000℃, which increases crack propagation and leads to the deterioration of material properties.

Method used

A composition of modified stainless steel fiber, modified ammonium polyphosphate, and modified nano-alumina is used. The modified stainless steel fiber has a composite layer structure, including a Cu-Mn composite oxide layer and a zirconium boride-silicate glass protective layer. The modified ammonium polyphosphate has a core-shell structure, and the modified nano-alumina has a surface double-layer modification structure. It blocks oxygen penetration and crack propagation through a multi-stage crack propagation inhibition mechanism.

Benefits of technology

It effectively inhibits oxygen penetration along cracks, reduces crack propagation, improves the high-temperature oxidation resistance and crack resistance of materials, significantly reduces crack intensification, and enhances interfacial bonding strength and material density.

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Abstract

This invention relates to the field of refractory materials technology, specifically a dry refractory material composition with excellent crack propagation resistance, comprising the following components: refractory aggregate, refractory powder, binder, modified stainless steel fiber, modified ammonium polyphosphate, and modified nano-alumina. Ammonium polyphosphate decomposes to release phosphoric acid, which is directionally released into the crack region through the controlled release effect of mesoporous aluminosilicates. Active B2O3 diffuses to the surface of the modified ammonium polyphosphate, reacting with borate ester groups to form a borophosphate gel network, rapidly sealing crack channels. Rare earth oxides act as catalytic sites, reducing the activation energy of AlPO4 formation. As the temperature continues to rise, the mesoporous aluminosilicate softens to form a viscous fluid, carrying residual AlPO4 towards the crack and filling the crack channels. The MgAl2O4 crystal phase framework and the silicate glass phase fill together to form a tightly sealed structure.
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