FAPRE Industrial Co., Limited. is a high-tech enterprise committed in R&D, production, and sales of abrasives products. We have 6 branch factories today, 400 employees, total area of 120,000 square meters and more than 30 new products developments per year.
Excellent Product Quality
FAPRE has advanced equipment and a professional technical development and management team for high quality assurance. Our factory environment, management system and product quality all meet the abrasives manufacturing factory system qualification standards.
Rich Products
Our products include Resin Bonded Abrasives, such as Grinding Wheels For Metal, Grinding Wheels For Stainless Steel (INOX), Flexible Grinding Wheels, Ceramic Cut Off Wheels, Zirconia Cutting Wheels, Cut Off Wheels For Metal, Cut Off Wheels For PipeLine, Cut Off Wheels For Stone; Coated Abrasives, such as Aluminum Oxide Flap Discs, Quick Change Flap Discs, Ceramic Flap Discs, Zirconia Flap Discs, Aluminum Oxide Fiber Discs, Zirconia Fiber Discs, Emery Cloth Roll; and Brown Corundum And White Corundum etc.
One-Stop Service
There is no intermediate link when ordering products from our company. We provide one-stop service from design, processing, sample trial production to mass production.
Leading Service
We have many years of industry experience, a complete production management, quality supervision, and sales service operation system. Whether you want to purchase Resin Bonded Abrasives or Coated Abrasives, just email your requirements and we can customize the product for you.
Semibrittle corundum, a novel abrasive material, exhibits intermediate brittleness and toughness between white corundum and brown corundum, hence its name. It possesses advantages such as high-temperature resistance, corrosion resistance, impact resistance, low porosity rate, and stable thermal properties.
White corundum is typically used as an abrasive due to its hardness and durability. This is formed by the fusion and crystallization of high-quality alumina. The resultant product is cooled, crushed, and then fused again. Its structure consists of irregularly shaped particles that make it sharp and hard.
White Aluminum Oxide grit is a 99.5% ultra-pure grade of blasting media and comes in a variety of grit sizes, making it an ideal blasting media for a wide variety of applications. This grit is an extremely sharp, long-lasting blasting abrasive, which can be re-used many times. It is one of the most widely used abrasives in blast finishing and surface preparation due to its cost, longevity, and hardness. The grit size is consistent and cuts much faster than other sandblasting media, leaving a smoother surface. The grains penetrate and cut even the hardest metals and sintered carbide.
The Hardness Of White And Brown Corundum
White and brown corundum are two popular materials used in a variety of industries due to their incredible hardness. Both are known for their exceptional properties, making them some of the most in-demand materials in the world.
Brown Fused Alumina As Refractory Materials
Brown fused alumina (BFA) is a highly durable and versatile refractory material widely used in a variety of applications, from abrasives to ceramics and even in the construction industry.
Brown Alundum Used As Abrasive Material
Brown Fused Alumina is produced by smelting bauxite in an electric furnace at high temperatures. It is then crushed, graded, and screened to create abrasive grains of various sizes suitable for different applications. The unique combination of chemical and physical properties of Brown Fused Alumina makes it an excellent material for abrasive applications.
Standard For Brown Corundum Testing
Brown corundum, also known as brown fused alumina, is a highly durable and abrasive material commonly used in industrial applications such as grinding, sandblasting, and polishing. To ensure the quality and consistency of brown corundum products, there are several testing standards that are widely followed.
White corundum micro powder, also known as white fused alumina micro powder, is a type of abrasive material that is widely used in various industries for its excellent characteristics.
Brown Fused Alumina Micro Powder
Brown Fused Alumina Micro Powder is a popular and highly sought-after material that has a wide range of uses across a variety of industries. This versatile material is made from high-quality bauxite, which is fused at a high temperature to create a strong and durable micro powder that can be used for a variety of purposes.
What is Brown Corundum
Brown Corundum, also known as brown fused alumina, is a type of synthetic abrasive material that is made by fusing bauxite with other materials in an electric arc furnace. It is known for its high hardness and durability, making it a popular choice for a wide range of industrial applications.
Advantages of Brown Corundum
High Hardness
Brown Corundum has a Mohs hardness of 9, making it one of the hardest abrasives available in the market. This characteristic ensures that it can withstand the toughest applications and provide consistent results over time.
High Toughness
Brown Corundum has excellent toughness, which allows it to resist fractures and breakage. This toughness also makes it suitable for high-pressure applications that require a strong abrasive.
High Density
Brown Corundum has a high density, which ensures that it can cut through tough materials quickly and efficiently. This density also helps to reduce the amount of dust generated during the cutting process, making it a cleaner and safer abrasive to use.
Low Heat Conductivity
Brown Corundum has a low heat conductivity, which means that it does not transfer heat easily. This property makes it useful in applications where heat needs to be controlled, such as in the production of refractory materials.
Brown Corundum Production Process
Brown Corundum, known for its hardness, thermal stability, and abrasive qualities, is an essential industrial mineral. This high-alumina material finds use in a variety of applications ranging from refractory bricks and grinding wheels to sandblasting and surface treatment techniques. The process of producing Brown Corundum is elaborate. Here is an in-depth look into the Brown Corundum production process.
Three primary raw materials are crucial for the production of Brown Corundum:
●Bauxite: Bauxite, rich in alumina (Al2O3), serves as the primary raw material. The choice of bauxite significantly impacts the quality of Brown Corundum as the alumina content, impurities, and physical properties like hardness and size distribution of the bauxite influence the properties of Brown Corundum.
●Anthracite: Anthracite, a type of hard and compact variety of coal, is the reducing agent in the process. It has a high carbon content, low impurities, and good resistance to physical and thermal shock.
●Iron Filings: Iron filings help in the reduction of alumina. They contribute to the formation of iron-aluminous spinel, which gives Brown Corundum its characteristic toughness and hardness.
The production of Brown Corundum involves several carefully controlled stages:
●Raw Material Preparation: The first stage involves sourcing and preparing the raw materials. The bauxite, anthracite, and iron filings are cleaned, dried, and sorted according to size. They are then mixed in precise proportions to ensure the correct chemical composition for the Brown Corundum.
●Smelting: The prepared mixture is then fed into an electric arc furnace. Here, they are subjected to temperatures ranging from 2000°C to 2200°C. This high temperature results in the reduction of alumina into aluminum and fusion of the ingredients, creating a 'brown fused' mass. This smelting process usually lasts several hours, and the furnace's operating conditions are closely monitored to ensure optimal fusion.
●Cooling: After smelting, the molten mass is allowed to cool gradually. This cooling process, which could last from several hours to a day, is crucial as it significantly affects the hardness, toughness, and crystalline structure of the Brown Corundum.
●Crushing: Once the fused mass is adequately cooled, it is then crushed into smaller pieces using heavy-duty industrial crushers. This stage also helps to remove any unreacted raw materials or impurities.
●Screening: The crushed Brown Corundum is then separated into various grain sizes through a process known as screening. This involves passing the crushed mass through a series of sieves with different mesh sizes. The sieved grains are then thoroughly washed to remove any residual impurities.
●Packaging: The final step in the production process is packaging. The Brown Corundum grains are packaged according to their grain sizes, ready for distribution to various industries.
The Brown Corundum production process demands rigorous quality control measures. Quality control involves testing the raw materials for impurities, monitoring the furnace's operating conditions during smelting, ensuring optimal cooling conditions, and testing the final product for grain size distribution, hardness, and chemical composition. This rigorous quality control ensures the Brown Corundum meets the high standards required by its various applications.
Brown Corundum is a versatile material with a wide range of industrial applications. Its hardness, toughness, and resistance to high temperatures make it an ideal material for various uses.
In Refractory and Ceramic Industries
- In the refractory and ceramic industries, Brown Corundum is used due to its excellent thermomechanical properties. Some of its key applications include:
- Production of high alumina bricks and castables.
- Fabrication of ceramic grinding media.
- Manufacture of kiln furniture and refractory shapes.
- Formulation of monolithic refractories.
In Bonded Abrasives and Grinding Wheels
- Brown Corundum is widely used in bonded abrasives due to its hardness and durability. Here are some areas where it's applied:
- Fabrication of cutting-off and grinding wheels.
- Production of snagging wheels.
- Creation of cup wheels and segments.
- Manufacturing of resinoid and vitrified grinding wheels.
In Coated Abrasives and Abrasive Blasting Media
- Brown Corundum's hardness and sharp edges make it ideal for coated abrasives and abrasive blasting media. It's used in:
- Sandpaper manufacturing.
- Production of abrasive belts and discs.
- Surface preparation and cleaning through abrasive blasting.
- Creation of non-slip surfaces.
In Metal and Thermal Spraying Coatings
- Brown Corundum's low thermal conductivity and high hardness make it ideal for metal and thermal spraying coatings. Some uses include:
- Thermal spray powders for corrosion and wear resistance.
- Grit blasting in preparation for thermal spray coating.
- Wear-resistant coatings on automotive parts.
- Restoration of worn parts through thermal spraying.
In the Production of High-Quality Brick and Metal Products
- Brown Corundum's durability and high-temperature resistance make it useful in producing high-quality brick and metal products. Its applications include:
- Production of high alumina bricks for steel furnaces.
- Creation of wear-resistant parts for machinery.
- Manufacture of metal matrix composites.
- Formulation of foundry sands for molds and cores.
Factors to Consider When Choosing Brown Corundum
Brown Corundum, also known as brown fused alumina, is widely used in various applications such as sandblasting, polishing, and grinding due to its excellent hardness, toughness, and chemical stability.
Consider the Purity and Grain Size
The purity and grain size of brown corundum are two essential factors that determine its performance and suitability for different applications. Generally, a higher purity level results in better performance, durability, and abrasive power. The grain size affects the cutting speed, aggressiveness, and smoothness of the corundum. Depending on your requirements, you can choose from a wide range of grain sizes, from coarse to fine.
Check the Chemical Composition and Physical Properties
Brown corundum is made of aluminum oxide and other minerals, which can affect its hardness, refractoriness, thermal conductivity, and color. You should check the chemical composition and physical properties of the corundum to ensure that they meet your requirements and the relevant industry standards. For example, if you need corundum for sandblasting, you should choose a type that has a high hardness and low friability.
Consider the Packaging and Transportation
When selecting brown corundum, you should also consider the packaging and transportation options offered by the supplier. The corundum should be packed in a sturdy and moisture-proof container to avoid contamination and damage during storage and transportation. The supplier should also provide you with fast and reliable delivery options to ensure that you receive your order on time and in good condition.
Differences Between Brown Corundum And White Corundum
Toughness and Hardness
Brown corundum is known for its high toughness, making it suitable for applications involving heavy grinding and cutting. In contrast, white corundum exhibits exceptional hardness and precision grinding capabilities, making it ideal for applications requiring fine finishes.
Impurity Content
White corundum has a significantly lower impurity content compared to brown corundum. The high purity of white corundum makes it highly desirable for applications where surface contamination must be minimized.
Uses
Brown corundum can be used to manufacture ceramics, resin high-consolidation abrasives, grinding, polishing, sandblasting, precision casting, etc. It can also be used to manufacture high-grade refractories. White corundum is suitable for grinding fine grained abrasives such as high carbon steel, high speed steel and stainless steel. White corundum can also be used for precision casting and advanced refractories.
Properties
Brown corundum has the characteristics of high purity, good crystallization, strong fluidity, low linear expansion coefficient and corrosion resistance. White corundum has the characteristics of high purity, good self-sharpening, acid-alkali corrosion resistance, high temperature resistance and stable thermal performance. Comparatively speaking, the hardness of white corundum is higher than that of brown corundum.
Compositions
Although both brown corundum and white corundum contain alumina, the alumina content of white corundum is over 99%, and that of brown corundum alumina is about 95%.
Colors
Because the content of aluminium oxide in white corundum is higher than that in brown corundum, the color of white corundum is white and brown corundum is brown and black.
Applications
Brown corundum is commonly used in heavy-duty grinding, surface preparation, and metal fabrication. White corundum finds its applications in precision grinding, polishing, and industries that require a high-quality surface finish.
Industrial and Economic Value
White corundum is distinguished by its superior cutting strength and polishing effect, making it a preferred material for processing carbon steel, alloy steel, malleable cast iron, and hard bronze. This preference is attributed to its higher purity level, which results from the removal or limitation of certain impurities during production. In contrast,brown corundum is widely utilized for its general abrasiveness and is commonly employed in the treatment of hardened steel, high-speed steel, and high carbon steel. The color and properties of brown corundum are a result of its natural impurity content, which, while making it slightly less pure than white corundum, does not significantly detract from its utility in industrial applications.
Uses of Brown Corundum
Sandblasting
Brown Corundum is ideal for sandblasting due to its moderate hardness, high accumulation density, absence of free silica, and significant toughness, making it an environmentally friendly choice for sandblasting materials. It is widely employed in industries such as aluminum and copper profiling, glass manufacturing, denim washing, precision molds, and more.
Free Grinding
Brown Corundum is employed in fields like picture tube manufacturing, optical glass production, monocrystalline silicon processing, lens production, watch and clock glass manufacturing, as well as in the shaping of crystal glass and jade. This type of abrasive is widely used in the advanced grinding materials industry.
Resin Abrasives
Featuring suitable color, good hardness, toughness, and the right particle section type and edge retention degree, Brown Corundum is applied in resin abrasive production with highly effective results.
Coated Abrasives
Brown Corundum serves as a primary raw material for the production of abrasive products like sandpaper and abrasive cloth.
Functional Fillers
Brown Corundum is mainly used in wear-resistant materials for automotive brake parts, specialized tires, and construction products such as highway pavements, airstrips, docks, parking lots, industrial flooring, sports venues, and more.
Filter Media
A novel application for abrasives, it employs granular abrasives as the base medium for filter beds, effectively purifying drinking water or wastewater. This represents a new type of water filtration material, particularly suitable for non-ferrous metal dressing and oil drilling mud thickening agents.
Hydraulic Cutting
This innovative cutting method employs abrasive materials as the cutting medium, relying on high-pressure hydraulic jets for precision cutting. It is applied in cutting oil (or natural gas) pipelines, and steel components, and represents a new, environmentally-friendly, and safe cutting approach.
Frequently Asked Questions
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