Corundum Bricks
Corundum brick is a high-performance refractory product with corundum as the main crystalline phase, widely used in high-temperature industrial fields. It is favored by various industries due to its excellent high-temperature resistance, mechanical strength and chemical stability. Below is a detailed introduction to our corundum bricks, including product classification, performance characteristics, chemical composition, application fields and product advantages.
Product Classification
According to chemical composition (added secondary components) or raw material sources, corundum bricks are mainly divided into four categories, each with unique characteristics and targeted application scenarios to meet diverse industrial needs.
1. White Corundum Brick
Key Words: High Purity, Low Impurity, High-Temperature
Strength Features: Made from industrial alumina, it has extremely low impurity content (especially low iron oxide content), so it presents white. It boasts extremely high refractoriness and high-temperature mechanical strength, with the best chemical stability among corundum bricks.
Al₂O₃ Content: ≥ 99%
2. Brown Corundum Brick
Key Words: Cost-Effective, General-Purpose, Anti-Spalling
Features: Smelted from bauxite in an electric arc furnace, containing a small amount of iron oxide (showing brown). It is characterized by dense structure, excellent spalling resistance, and more advantageous price compared with white corundum brick.
Al₂O₃ Content: ≥ 95%
3. Chrome Corundum Brick
Key Words: Corrosion Resistance, Glass Kiln, Cement Kiln
Features: Chromite or chromium oxide is added to corundum. Its biggest feature is extremely strong resistance to glass melt and slag erosion, and good thermal shock resistance at the same time.
Al₂O₃ Content: 90-95%
4. Zirconia Corundum Brick
Key Words: Wear Resistance, Thermal Shock Stability, Glass Furnace Wall
Features: Zircon is added. The addition of zircon component greatly improves the material's wear resistance and thermal shock stability (resistance to rapid cooling and heating).
Al₂O₃ Content: 60-80% (+ ZrO₂)
Performance Characteristics:
As a high-performance refractory material, corundum bricks have comprehensive excellent properties, and different types of corundum bricks further enhance targeted performance based on the above characteristics:
1. High Refractoriness: The refractoriness can reach above 1750℃, and some high-purity products (such as white corundum brick) can withstand long-term high temperatures above 1800℃, maintaining stability in high-temperature environments without deformation or damage.
2. High Strength: It has high room-temperature compressive strength, up to 340MPa, and can bear mechanical loads at high temperatures. Among them, white corundum brick has outstanding high-temperature mechanical strength.
3. Good Chemical Stability: It has strong resistance to acidic or alkaline slag, metals, glass melt, etc., and is not easy to undergo chemical reactions. White corundum brick has the best chemical stability due to its high purity.
4. Excellent Slag Resistance and Erosion Resistance: Especially has extremely strong resistance to acidic, neutral and some alkaline molten slags. Chrome corundum brick is particularly outstanding in this performance, which can effectively extend the service life.
5. Good Thermal Shock Stability: Although not as good as some silicon-containing or magnesia materials, it can be significantly improved by adding zircon (such as zirconia corundum brick) or adjusting particle gradation. Zirconia corundum brick has superior thermal shock stability.
Corundum-mullite brick is a premium shaped refractory product with corundum and mullite as the main crystalline phases. By virtue of the synergistic effect of the two main phases, it integrates the high temperature resistance and corrosion resistance of corundum with the excellent thermal shock stability of mullite. This product is widely recognized in global high-temperature industrial fields such as metallurgy, glass, petrochemicals, and carbon black production, providing reliable lining solutions for key kiln components and significantly improving equipment operation efficiency and service life.
Key Performance Advantages:
1. Outstanding thermal shock resistance: This is its core advantage. Mullite has a low coefficient of thermal expansion, and its needle-shaped crystal structure absorbs stress caused by temperature fluctuations, significantly reducing cracking caused by rapid cooling and heating at high temperatures. Its performance surpasses that of pure corundum bricks.
2. Balanced strength and corrosion resistance: The presence of the corundum phase ensures high strength at both room and high temperatures, while also providing good resistance to acidic slag, molten glass, and other media. While its alkali resistance is slightly inferior to that of chrome corundum bricks, it offers a wider range of applications.
3. Moderate thermal conductivity: Compared to high-density corundum bricks, it offers a lower thermal conductivity while maintaining a certain degree of insulation, reducing heat loss in high-temperature equipment and making it suitable for applications requiring thermal insulation.
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Corundum Bricks
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INDEX
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GYZ-99A
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GYZ-99B
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GYZ-98
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GYZ-95
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Al2O3 (%)≥
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99
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99
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98
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95
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SiO2 (%)≤
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0.15
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0.2
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0.5
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---
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Fe2O3 (%)≤
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0.10
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0.15
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0.2
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0.3
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Apparent Porosity (%)≤
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19
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19
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19
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20
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Bulk Density (g/cm3)≥
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3.20
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3.15
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3.15
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3.1
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Cold Crushing Strength (MPa)≥
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80
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80
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80
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100
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Permanent Linear Change(1600°×3h) /%
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-0.2~+0.2
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-0.2~+0.2
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-0.2~+0.2
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-0.3~+0.3
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Refractoriness Under Load(0.2MPa, 0.6%)/℃≤
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1700
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1700
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1700
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1700
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Corundum-mullite Bricks
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INDEX
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GMZ-88
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GMZ-85
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GMZ-80
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GYZ-75
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Al2O3 (%)≥
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88
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85
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80
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75
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Fe2O3 (%)≤
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0.8
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1.0
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1.0
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1.2
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Apparent Porosity (%)≤
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15(17)
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16(18)
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18(20)
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18(20)
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Bulk Density (g/cm3)≥
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3.00
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2.85
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2.75
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2.60
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Cold Crushing Strength (MPa)
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100-120
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80-100
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80-100
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60-80
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Permanent Linear Change(1600°×3h) /%
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-0.1~+0.1
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-0.1~+0.1
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-0.2~+0.2
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-0.2~+0.2
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Refractoriness Under Load(0.2MPa, 0.6%)/℃≤
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1700
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1680
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1650
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1650
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Applications of Corundum Bricks:
1. Steel Industry: Used for linings of high-temperature smelting equipment such as converters, electric furnaces, and refining furnaces, as well as components such as slides, stoppers, and pouring systems for continuous casting.
2. Non-ferrous Metal Smelting: Lined in smelting and refining furnaces for non-ferrous metals such as aluminum, copper, and nickel.
3. Glass Industry: Commonly used in checker bricks in the regenerator chambers and charging ports of glass melting furnaces.
4. Cement Industry: Lined in the high-temperature firing zone of cement rotary kilns.
5. Chemical Industry: Lined in high-temperature reactors and cracking furnaces.
6. Energy Industry: Lined in high-temperature exhaust gas treatment equipment and gasifiers.
Applications of Corundum Mullite Bricks:
1. Cement Industry: Lined in the transition zone and precalciner of cement rotary kilns. They can withstand the large temperature fluctuations within the rotary kiln while resisting the corrosive gases produced by the decomposition of cement raw materials.
2. Glass Industry: Used in glass furnace regenerator checker bricks and kiln sidewalls, they withstand frequent temperature fluctuations and are not easily corroded by molten glass.
3. Metallurgy and Chemical Industry: Suitable for use in the medium and low temperature areas of non-ferrous metal smelting furnaces, high-temperature roasting furnace linings, and catalyst carrier roasting equipment in the chemical industry, balancing strength and thermal shock resistance requirements.
Shandong Robert New Material Co., Ltd. is located in Zibo City, Shandong Province, China, which is a refractory material production base. We are a modern enterprise that integrates the research and development, production, sales, kiln design and construction, technology, and export refractory materials. We have complete equipment, advanced technology, strong technical strength, excellent product quality, and good reputation. Our factory covers over 200 acres and an annual output of shaped refractory materials is approximately 30000 tons and unshaped refractory materials is 12000 tons.
Our main products of refractory materials include: alkaline refractory materials; aluminum silicon refractory materials; unshaped refractory materials; insulation thermal refractory materials; special refractory materials; functional refractory materials for continuous casting systems.
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