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High-Quality Chrome Corundum Bricks from China Suppliers | Durable Factory Production for Industrial Applications
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High-Quality Chrome Corundum Bricks from China Suppliers | Durable Factory Production for Industrial Applications

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Chrome corundum bricks, manufactured by leading suppliers in China, are known for their exceptional corrosion resistance attributed to their unique Al2O3/Cr2O3 solid crystal structure. These bricks offer high thermal shock resistance, stability at elevated temperatures, and robust corrosion resistance, particularly against alkali substances, making them ideal for high-temperature industrial applications. Our factory utilizes premium raw materials such as fused corundum and Cr2O3 solid crystal, with the option to incorporate ZrO2 to enhance thermal shock performance. For standard sizes and general products, we employ semi-dry high-pressure molding techniques, while for customized shapes or special applications, isostatic pressing is utilized to guarantee quality and performance.

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    Product Detail

    Composition and Classification

    Outstanding corrosion resistance from specialized Al2O3/Cr2O3 structure

    Chrome corundum bricks boast superior corrosion resistance due to their unique Al2O3/Cr2O3-solid crystal makeup. With an increase in Cr2O3 content, these bricks exhibit enhanced resistance to corrosion. Simultaneously, they offer notable wear resistance, exceptional thermal shock resilience, and a minimized creep rate.

    Chrome corundum bricks are a top-choice for industries requiring optimal corrosion resistance, as Cr2O3 is the most corrosion-resistant refractory oxide for molten glass applications, particularly beneficial for mineral wool glass, insulating glass, colored and special glasses, as well as ceramic frit glaze. Key components like over-coating tiles, regenerator chimney blocks, port necks, target walls, superstructures, doghouse corners, and discharging holes benefit greatly from these bricks.

    Chrome-Corundum Brick 1

    Application

    Chrome Corundum Bricks are highly valued in the glass industry for their exceptional performance in high-temperature environments and superior resistance to slag and molten glass corrosion. These bricks primarily consist of a solid solution of Al2O3 (alumina) and Cr2O3 (chromium oxide), providing robust structural integrity and longevity.
    Key Features and Benefits:
    High Corrosion Resistance: Chrome Corundum Bricks exhibit outstanding resistance to the corrosive effects of molten glass and slag, significantly outperforming traditional refractory materials. The presence of Cr2O3 enhances their durability, making them ideal for critical areas in glass furnaces.
    Thermal Stability: These bricks maintain excellent stability under high temperatures, which is crucial for preserving the structural integrity of glass furnaces during prolonged use.
    Application in Glass Furnaces: Chrome Corundum Bricks are particularly effective in the high-stress areas of glass furnaces, such as the feed inlet, furnace bottom, throat, and regenerator checkers. Their use can extend the operational life of furnaces by providing enhanced resistance to wear and corrosion.

    Chrome Corundum Bricks Have Different Colors

    Chrome Corundum Bricks are renowned for their high temperature resistance and excellent slag corrosion resistance, particularly against molten cinders, outperforming low silicon corundum bricks. These bricks typically contain Cr2O3, with their primary mineral composition being an Al2O3-Cr2O3 solid solution.

    Initially, Chrome Corundum Bricks appear green due to the presence of chrome green in the corundum. However, after undergoing high-temperature sintering, their appearance changes to red or sometimes even purple-red due to the reaction with CO.

    The color of Chrome Corundum Bricks depends on the percentage of chromium oxide (Cr2O3) present:

    • 3% Chromium Oxide: Light red color
    • 8% Chromium Oxide: Purplish-red color
    • More than 20% Chromium Oxide: Black and red color

    The higher the percentage of chromium oxide, the darker the color of the brick.

    • Chrome-Corundum Brick 2
    • Chrome-Corundum Brick

    Physical & Chemical Index

    Items Parameters
    30C 30 30L 55C 55 94BZ 94A
    Chemical Composition Cr2O3 (%) ≥29 ≥29 ＞28 ≥53 ≥53 ≥93 ≥93
    Al2O3 (%) ≥59 ≥59 ＞60 ≥36 ≥36 - -
    ZrO2 (%) ≥2.0 ≥2.0 ＞3 ≥2.0 ≥2.0 - -
    SiO2 (%) - - - - - - -
    TiO2 (%) - - - - - 3～4 3～4
    Bulk Density (Kg/dm³) ≥3.4 ≥3.5 ≥3.5 ≥3.6 ≥3.7 ≥4.1 ≥4.33
    Apparent Porosity (%) ≤19 ≤18 ≤17 ≤19 ≤18 ≤20 ≤15
    Cold Crushing Strength (Mpa) ≥80 ≥100 ≥100 ≥80 ≥100 ≥100 ≥200

    Frequently Asked Questions (FAQ)

    What are the primary components of Chrome Corundum Bricks?
    Chrome Corundum Bricks primarily consist of a solid solution of Al2O3 (alumina) and Cr2O3 (chromium oxide). This composition provides the bricks with high structural integrity and exceptional durability.
    Why do Chrome Corundum Bricks exhibit superior corrosion resistance?
    Their outstanding corrosion resistance is due to the unique Al2O3/Cr2O3-solid crystal makeup. Because Cr2O3 is highly resistant to molten glass, increasing the chromium oxide content directly enhances the bricks' resistance to corrosion and wear.
    Where are these bricks commonly used in glass furnaces?
    They are particularly effective in high-stress and critical areas of glass furnaces, including the feed inlet, furnace bottom, throat, regenerator checkers, over-coating tiles, port necks, and discharging holes.
    Why do Chrome Corundum Bricks change color from green to red?
    Initially, the bricks appear green due to the presence of chrome green. After undergoing high-temperature sintering, they react with CO, which changes their appearance to red or purple-red.
    How does the percentage of Chromium Oxide affect the brick color?
    The color corresponds directly to the Cr2O3 content: 3% Chromium Oxide produces a light red color, 8% produces a purplish-red color, and more than 20% results in a dark black and red color.
    What are the physical and chemical indices of high-grade Chrome Corundum Bricks?
    High-grade configurations (like 94A) feature a Cr2O3 content of ≥93%, a high bulk density of ≥4.33 Kg/dm³, a low apparent porosity of ≤15%, and a cold crushing strength of ≥200 Mpa.