Metal-carbon composite-containing magnesia-carbon refractory and method for producing the same
By introducing silicon-carbon multiphase particles and modified flake graphite into magnesia-carbon refractory materials, the problem of dual oxidation erosion of the carbon phase under converter blowing conditions was solved, thereby improving the high-temperature strength and slag erosion resistance of the material and delaying oxidation damage and structural spalling.
Patent Information
- Application Number
- CN202610452895.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2026-04-08
- Publication Date
- 2026-06-23
- Estimated Expiration
- 2046-04-08
AI Technical Summary
Under converter blowing conditions, the carbon phase of magnesia-carbon refractories is subjected to dual erosion by direct oxidation from high oxygen partial pressure gas flow and indirect oxidation from FeO in the slag, resulting in the expansion of interconnected pores and deep penetration of slag, which seriously affects the grain boundary strength and slag wettability of the material.
Magnesium-carbon refractory materials containing metal-carbon composite phases are prepared by combining silicon-carbon composite particles and modified flake graphite. The preparation method includes ball milling of silicon powder and flake graphite, surface activation treatment with tetraethyl orthosilicate, and high-temperature solid-state reaction sintering to generate SiC-Si-C three-phase composite particles. A composite ceramic coating containing BPO4 phase is formed on the graphite surface to enhance the structural integrity and oxidation resistance of the material.
It effectively inhibits the oxidation damage of the carbon phase, reduces apparent porosity and decarburized layer thickness, improves the high-temperature strength and slag erosion resistance of the material, and extends the service life of the material.