Al2O3 / Cr / Cr3C2 complex-phase submersed nozzle and preparation method thereof

By using a composite material preparation method of aluminum powder, chromium oxide powder, and carbon powder, the problems of carbon contamination and structural processing of submerged entry nozzles have been solved, resulting in high-performance submerged entry nozzles that meet the production requirements of high-quality steel.

CN122441952APending Publication Date: 2026-07-24WUHAN UNIV OF SCI & TECH +1
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Patent Information

Application Number
CN202610641709.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-11
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing submersible nozzles suffer from problems such as easy carbon contamination leading to steel deterioration, poor fracture toughness, insufficient thermal shock resistance, low high-temperature strength, poor wear resistance, short service life, insufficient erosion resistance, poor corrosion resistance, and inability to be processed into complex structures.

Method used

Using aluminum powder, chromium oxide powder, and carbon powder as raw materials, an Al2O3/Cr/Cr3C2 multiphase immersion nozzle was prepared by controlling the coupling process of the aluminothermic reaction and carbothermic reduction. This formed a three-phase synergistic reinforcing material with Al2O3 as the matrix phase, metallic Cr as the plastic toughening phase, Cr3C2 as the high-strength wear-resistant phase, and residual C as the conductive phase. This was then combined with electrical discharge machining technology.

Benefits of technology

The prepared Al2O3/Cr/Cr3C2 multiphase immersion nozzle has high fracture toughness, high temperature strength, good thermal shock resistance, excellent erosion and corrosion resistance, long service life, and can be processed into complex structures to avoid steel deterioration.

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Abstract

The invention particularly relates to an Al2O3 / Cr / Cr3C2 complex-phase submersed nozzle and a preparation method of the Al2O3 / Cr / Cr3C2 complex-phase submersed nozzle. According to the technical scheme, aluminum powder, chromic oxide powder and carbon powder are mixed, and mixed powder is obtained; placing the mixed powder, absolute ethyl alcohol and ball milling beads in a ball mill, and performing ball milling to obtain mixed slurry; drying the mixed slurry to obtain mixed powder; grinding the mixed powder to obtain a ground material; filling the grinding material into a graphite mold, and sealing; putting the sealed mold into a hot-pressing sintering furnace, vacuumizing, introducing CO atmosphere, heating to 1550-1750 DEG C, pressurizing, and keeping the temperature and pressure; and then cooling to room temperature along with the furnace, and demolding to obtain the Al2O3 / Cr / Cr3C2 complex-phase submersed nozzle. The steel has the characteristics of being high in fracture toughness, high in high-temperature strength, good in wear resistance, good in thermal shock resistance, excellent in anti-scouring capacity, excellent in erosion resistance, long in service life and capable of being used for machining complex structures, and steel deterioration caused by carbon can be effectively avoided.
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