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Black fused alumina, also known as black aluminum oxide, is a type of abrasive material that is commonly used in various industrial applications. It is made from the high-quality bauxite ore by fusing it in an electric arc furnace at high temperatures. During this process, the aluminum oxide content in the bauxite is reduced, resulting in a material that is predominantly composed of aluminum oxide and iron oxide.
Color and Appearance: As the name suggests, black fused alumina is black in color. It has a matte appearance and a high hardness.
Hardness: Black fused alumina is known for its high hardness, making it suitable for abrasive applications. It is often used for cutting, grinding, and polishing metals, ceramics, and other materials.
Abrasive Properties: It is an abrasive material with excellent cutting and grinding properties. It is used in applications such as sandblasting, grinding wheels, abrasive belts, and abrasive powders.
Strength and Durability: It has good strength and durability, making it a reliable choice for applications where wear resistance is essential.
Chemical Composition: Black fused alumina typically contains aluminum oxide (Al2O3) as the primary component, along with iron oxide (Fe2O3) and small amounts of other impurities.
| Black corundum | ||||
| Color | Black | |||
| Crystal form | Trigonal crystal system | |||
| Hardness (Mohs) | ≥9.0 | |||
| Melting point (ºC) | 2050 | |||
| Maximum operating temperature (ºC) | 1850 | |||
| True density (g/cm3) | ≥3.50 | |||
| Linear expansion coefficient (0-1600ºC) | 7 to 9 | |||
| Specifications | Main chemical composition % | |||
| Al2O3 | Fe2O3 | SiO2 | TiO2 | |
| Level 1 | 85 | 6 to 9 | 5 to 8 | 2 to 4 |
| Level 2 | <80 | >9 | >8 | >4 |
Grinding and Polishing:
- Black fused alumina is widely used in the manufacture of grinding wheels, abrasive belts, and abrasive discs.
- It is employed for grinding and polishing metals, ceramics, and other hard materials. It is particularly effective in achieving smooth and precise surfaces.
Surface Preparation:
- In industries such as automotive, shipbuilding, and construction, black fused alumina is used in sandblasting and shot blasting applications.
- It is applied to prepare surfaces for painting, coating, or other finishing processes by removing rust, old paint, scale, and contaminants.
Cutting:
- Black fused alumina is used as an abrasive material in cutting wheels or discs for precision cutting of various materials, including stainless steel, carbon steel, and alloys.
- It provides clean and accurate cuts in manufacturing and metalworking processes.
Refractory Industry:
- In the refractory industry, black fused alumina is sometimes added to refractory materials to enhance their properties.
- It can improve the resistance of refractories to high temperatures, wear, and corrosion, making them more suitable for demanding applications like furnaces and kilns.
Abrasive Blasting:
- Black fused alumina is used in abrasive blasting cabinets and systems for cleaning and surface preparation in a variety of industrial settings.
- It helps remove rust, scale, paint, and other surface contaminants from metal surfaces.
Lapping and Polishing:
- In precision machining and optics manufacturing, black fused alumina is used as an abrasive in lapping and polishing processes.
- It assists in achieving flat and highly polished surfaces on optical lenses, semiconductor wafers, and precision components.
Cutting Tools:
- Some cutting tools, such as cutting discs and abrasive saw blades, are made with black fused alumina as an abrasive material.
- These tools are used in construction, metalworking, and fabrication.
Refractory Castables:
- Black fused alumina can be used as an aggregate in the formulation of refractory castables.
- It improves the overall performance and resistance of these materials in high-temperature environments.
Abrasive Powders and Compounds:
- Black fused alumina is ground into fine powders and used in abrasive slurries and compounds for polishing and surface finishing.
- It is utilized in applications like jewelry making, optics, and electronics manufacturing.
Tumbling and Deburring:
- It is employed in tumbling and deburring processes to remove burrs and sharp edges from metal and plastic components, providing a smooth and finished appearance.
Zhengzhou Xinli Wear-resistant Materials Co. Ltd.
Zhengzhou Xinli Group, founded in 1996, is a professional integrative enterprise and Manufacturer that engaged in various abrasives production, R&D and selling various wear-resistant materials, such as white fused alumina, aluminum oxide powder, green/black silicon carbide powder, brown fused alumina, zirconium oxide beads, walnut shell, corn cob, Fused Mullite, reflective glass beads, metal abrasive and other wear-resistant materials. With the advanced production equipment and testing instruments, the annual sales quantity of the wear-resistant materials reaches to 3,000 tons with different standards, like PEPA,JIS and ANSI etc. Zhengzhou Xinli has become the first enterprise that achieves the original crystal granularity to standard 0.3μm, can gain the effect of metal mirror polishing. Xinli Group insist on innovation, standardized and refined production to help each customer use the quality-stable and preferential price products, which is the goal that keeps Xinli moving forward.
1ton/jumbo bag
25kgs/bag, 40 bags/jumbo bag
25kgs/woven bag or kraft paper bag
Q: Are you a trading company or manufacturer?
A: We are a manufacturer enterprises of abrasives over 20years.our products have competitive price and quality guarantee. Welcome to send your inquiry!
Q: Do you provide samples ? is it free or extra ?
A: Yes, we could offer the sample for free charge but you need to pay the cost of freight.
Q:How can I get the new price of a product?
A: Please provide the exact or approximate quantity, packing details, destination port or special requirements, then we could give you the price accordingly.
Q:How do you manufacture abrasives?
A:Grinding → Wet classification (granulation) → Drying → Bagging.
Q:Is the quality of the abrasives okay?
A: We have the quality control system ISO9001:2008, and it's been followed strictly. We also have the professional QC team, and each our package worker will be in charge of the final inspection according to the QC instruction before packing.
Q: How long is the lead time?
A: Except OEM products, generally 5-7 days for trial order, 10-20 days for mass order once deposit received.
Q:How about your after-sale service ?
A: If any technical or quality problem after you receive the cargo, you can contact us any time.If the problem caused by us, we will send you free goods for replacement or refund your loss.
Q:What is the price?
A:Please feel free to contact us using the Price / Quotation Request Form as it depends on the quantity, etc.
Q:Can we have a visit to your factory?
A:You're warmly welcoming to visit our plant. And please inform me of your scheduled time in advance, we'll pick you up and arrange the agenda for you.
Q:Do you have any experience with exporting?
A:Yes, We have a global sales network reaching all around the world.
Q:Can I use my own design package?
A:Yes, The package can be with your logo.
