Description
Meaning chrome corundum brick
Chrome corundum brick is a refractory material made of alumina and chromium as the main raw materials, through high-temperature melting, casting, sintering and other processes.
Its main mineral composition is α-Al2O3-Cr2O3 solid solution, the secondary mineral composition is a small amount of composite spinel (or no composite spinel), and the chromium oxide content is 1% to 30%.
This material not only has excellent high temperature resistance, but also has the characteristics of wear resistance, heat shock resistance and acid and alkali corrosion resistance.
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Physical properties of chrome corundum brick
| Physical properties | describe |
|---|---|
| Refractoriness | Over 1750℃ |
| Softening temperature under load | Over 1750℃ |
| Normal temperature compressive strength | High performance chrome corundum bricks are generally 150MPa, high purity corundum bricks are generally 70-100MPa |
| Thermal shock stability | As the Cr2O3 content increases, it decreases. The thermal shock resistance of chrome corundum bricks with low Cr2O3 content is better. |
| Slag erosion resistance | Stronger than other oxide materials, especially in refractory materials containing Cr2O3 |
From Wikipedia: Fire brick
Chrome corundum brick production process
Chrome corundum brick products are made of corundum and fused chromium oxide as the main raw materials, with additives such as micropowder, after mixing, molding, drying, and high-temperature firing in a shuttle kiln. This process ensures the wear resistance, heat shock resistance and acid and alkali corrosion resistance of the product.
Performance characteristics of chrome corundum bricks
- High temperature resistance: able to withstand the working environment of high temperature furnace lining.
- Wear resistance: still maintain good mechanical properties at high temperatures.
- Corrosion resistance: especially tolerance to acid and alkali environments.
- Thermal shock stability: good thermal shock resistance, suitable for use under thermal shock conditions.
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chrome corundum vs aluminum oxide
| feature | Chrome corundum | Alumina |
|---|---|---|
| Definition | Alumina containing chromium ions (Cr³⁺), red or pink, often used as gemstone material | Commonly known as alumina, there are two main variants, α and γ, which are the basic raw materials for the preparation of metallic aluminum |
| Main ingredients | α-alumina | Al₂O₃ |
| Color | Bright red or pink | Depending on impurities, generally gray |
| Structure | Hexagonal closest packing structure | α type: hexagonal close packing; γ type: cubic face-centered close packing |
| Applications | Gemstone making, high-end refractory materials | Making metallic aluminum, refractory materials, abrasive materials, integrated circuit board substrates |
Application areas of chrome corundum brick
- Coal chemical industry: used in key parts of chemical industry kilns.
- Fiberglass kiln: especially in alkali-free fiberglass kiln.
- Garbage incinerator: as an important component, improve combustion efficiency.
- Carbon black furnace: lining material, enhance the wear resistance and corrosion resistance of the furnace body.
- Copper smelting furnace: lining material, extend the service life of the furnace body.
- Steel rolling heating furnace: used in slideway and steel-out platform to improve production safety.
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