Introductions
Sintered Corundum Bricks are kind of high alumina refractory bricks, It is a refractory clinker made of calcined alumina or industrial alumina powder as raw material, finely ground into balls or green bodies, and sintered at a high temperature of 1750~1900. Sintered alumina with a W(Al2O3) over 90% is mostly made of uniform fin-grained corundum directly combined, the apparent porosity is below 3.0%, the bulk density reaches 3.3g/cm3, and the refractoriness is closed to the melting point of corundum. It has good volume stablity and chemical stability, is not easily corroded by reducing atmosphere, molten glass and molten metal, and has good mechanical strength and wear resistance at room temperature and high temperature.
The alumina content in Corundum Bricks can be traced to the use of synthetic corundum of high purity, such as white fused alumina or tabular alumina. Additional ingredients are special refractory clays, reactive alumina and very pure modifications of silica.
Sintered Corundum Bricks are fired at high temperatures to form a matrix with mullite, mullite-corundum or corundum that has excellent volume stability.
Properties
· High cold compressive strength reaches up to 340MPa.
· High initial refractoriness under load, over 1750 ℃.
· Good chemical stability.
· With strong resistance to acid and basic slag erosion.
· With strong resistance to metal and molten good and glass erosion.
· Thermal resistance is related to its structure.
· Dense foods have a strong resistance to erosion.
Chemical & Physical index:
Item / Types | Ultra Purity Corundum | Super Corundum | 99 Corundum | 95 Corundum | 90 Corundum | Corundum-Mullite | |
Chemical Composition | Al2O3% | ≥99.8 | ≥99.3 | ≥98.5 | ≥95 | ≥90 | ≥87 |
SiO2% | ≤0.15 | ≤0.24 | ≤0.28 | ≤0.3 | ≤8.0 | ≤8.5 | |
Fe2O3% | ≤0.1 | ≤0.1 | ≤0.2 | ≤0.2 | ≤0.2 | ≤0.2 | |
Bulk density, g/cm3 | ≥3.75 | ≥3.65 | ≥3.55 | ≥3.30 | ≥3.20 | ≥3.15 | |
Apparent porosity, % | ≤18 | ≤18 | ≤18 | ≤18 | ≤18 | ≤18 | |
Cold crushing strength, MPa | ≤100 | ≤100 | ≤100 | 120≥ X≥100 | ≥120 | ≥120 | |
Refractoriness under load, ℃(0.2MPa,0.6%) | ≥1850 | ≥1850 | ≥1800 | ≥1770 | ≥1750 | ≥1750 | |
Reheating linear change rate, %(1600℃ x 8h) | -0.2 | -0.2 | -0.2 | 0.2 | 0.2 | 0.2 | |
Thermal expansion coefficient, x 10-6 (Room temp. to 1300’C) | 8.1 | 8.1 | 8.1 | 8.1 | 8.1 | 8.1 | |
Characteristics
Sintered corundum bricks are high-grade refractory materials, suitable for use in high-temperature kilns under various atmospheric conditions. High-quality high-purity corundum bricks are widely used in zirconia ceramics, fluorescent materials, electronic ceramics, and magnetic materials. High-temperature sintering of ceramic powder and gasification furnaces in the petrochemical industry, secondary reforming furnaces for synthetic ammonia, carbon black reaction furnaces, and high-temperature kilns for the glass industry. The dimensions, physical and chemical indicators, and service life of the products have met the requirements of high-temperature furnaces.
Sintered corundum bricks are mainly used in blast furnaces and refining furnaces outside the metallurgical industry. It is also used in ironmaking blast furnaces and blast furnace hot blast stoves, refining furnaces outside steelmaking furnaces, and sliding nozzles. Glass melting furnaces and petrochemical industrial furnaces are now used in a large proportion of glass melting furnaces in the market.
Application
It is widely used in the partition wall of carbonization chamber, firing chamber of coke oven, heat regenerator chamber of steelmaking open hearth furnace, slag pocket, soaking pit furnace, glass melting furnace, arch crown and other weight bearing area of ceramic kilns
Q: Are you a trading company or a manufacturer ?
A: We are a Manufacturer, our factory is located in Xinmi area in Zhengzhou City, Hennan, China, we can produce high quality refactory goods quickly with low prices.
Q2: How do you control the products quality?
A2: With strict quality control system throughout the materials selection and production process, our refractory and ceramic fiber products quality is effectively controlled to meet customer requirements.
From the raw materials selecting, our quality control begin. The quality certificates of raw materials are required and each batch will be tested before using. During production, the quality control is conducted by workers and then each piece will be sorted and examined by quality supervisor.
FAQ
Q3: What`s the lead time for my order?
A3: It depends on customers' requirements and our production schedule. And usually we need 30-60 days for refractory bricks, 10-25 days for unshaped refractory materials and 10-20 days for ceramic fiber blankets.
Q4: Can you offer Door-to-Door delivery?
A4: Yes, but only for some countries such as U.S., UAE, Saudi Arabia, Iran, and Russia, etc.
Q5: What is the minimum quantity?
A5: There is no minimum order quantity. Depending on the item and processing, there may be a minimum production required, however we can offer a quotation based only on the quantity you need.
Q6: Can you give me a brief introduction of the application of your products?
A6: Our core refractory business comprises the production, sale and installation of high-grade refractory products, the development and implementation of customized system solutions as well as rendering outstanding services for the key industries in Glass, Iron& Steel, Petrochemical, Cement, Ceramic and Nonferrous Metals.
