White Fused Alumina- WFA

What is White Fused Alumina- WFA

White Fused Alumina (WFA) is a high-quality, pure, grain-sized abrasive material produced from fused alumina. It is obtained by melting aluminum oxide powder in an electrical arc furnace and then cooling it down slowly. The resulting white crystal has a high level of purity, excellent cutting properties, and is widely used in abrasives, refractory, ceramics, vitrified, and resin-bonded grinding wheels and polishing, sandblasting, grinding, and polishing, among other applications. WFA also has a high chemical stability and superior resistance to acids, alkalis, and chemicals compared to other abrasives.

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Benefits of White Fused Alumina- WFA

High Purity

White Fused Alumina is produced by fusing high-grade alumina in an electric arc furnace, which results in a pure form of alumina with no impurities.

Hardness

WFA is a very hard abrasive material with a Mohs hardness of 9, making it an excellent choice for sandblasting and grinding applications.

High Density

The high density of WFA allows it to be used for applications that require high strength, such as in refractory and ceramic products.

Chemical Stability

This material is chemically stable and does not react with other materials, making it suitable for use in harsh chemical environments.

Thermal Stability

WFA is resistant to high temperatures, making it suitable for use in high-temperature applications, such as in furnace linings and insulation materials.

Low Thermal Expansion

This material has a low coefficient of thermal expansion, which makes it ideal for use in applications where dimensional stability is required.

What are the Applications of White Fused Alumina- WFA

Abrasive applications
WFA powder is widely used in abrasive products, including bonded abrasives, such as grinding wheels and cutting-off wheels, and coated abrasives, like sandpaper and abrasive cloth. Its high hardness and self-sharpening characteristics make it an ideal material for grinding, polishing, and cutting various materials, including metal, wood, glass, ceramics, and plastics.

Blasting media
White fused alumina powder can also be used as a blasting media for cleaning, deburring, and surface preparation purposes. Its high hardness, combined with its ability to fracture into sharp-edged particles, makes it effective for removing rust, paint, and other surface contaminants, without causing excessive material removal or damage to the underlying substrate.

Refractories
WFA powder is an essential raw material for the production of high-quality refractory products, such as bricks, castables, and refractory cements. Its high alumina content, combined with its excellent thermal stability, low thermal expansion, and high refractoriness under load, makes it suitable for use in high-temperature applications, including furnaces, kilns, and incinerators.

Ceramics
White fused alumina powder can be used as a raw material in the production of advanced ceramics, such as spark plugs, electrical insulators, and wear-resistant components. Its high purity and fine particle size make it suitable for applications requiring precision and high-performance characteristics.

Surface finishing
WFA powder can be used in lapping and polishing processes to achieve a high-quality, precision finish on various materials, including metal, glass, and ceramics.

Types of White Fused Alumina- WFA

Regular WFA
This is the most commonly used type of WFA. It is made by melting high-purity alumina and then cooling and solidifying it into a white crystalline material. It is hard, dense, and has a high melting point, making it ideal for abrasive applications.

Low soda WFA
This type of WFA is made by reducing the amount of soda used in the production process. This results in a material that is harder and more durable than regular WFA and is ideal for abrasive applications that require high temperatures.

High purity WFA

This type of WFA is made using high-purity alumina, resulting in a material that is even harder and more durable than regular and low soda WFA. It is ideal for high-precision abrasive applications that require a high degree of accuracy and consistency.

Surface treated WFA

This type of WFA is treated with various surface coatings to improve its properties and performance. Some surface treatments include stearate, silane, or resin coatings, which can improve the material's grinding and polishing properties and reduce dust levels.

Sintered WFA

Sintered WFA is made by compressing regular WFA into a dense, hard material. This results in a material that is more durable and has better mechanical and thermal properties than regular WFA. It is often used in high-temperature applications, such as furnace linings and refractory materials.

How is White Fused Alumina used as an Abrasive?

Grain Sizes and Shapes
WFA comes in various grain sizes, ranging from very fine powder to coarser types. Each grain size is suited to a specific kind of abrasive application. For instance, finer grains are used for precision work, while coarser grains are used for more aggressive abrasion.

Blasting Media
WFA's hardness makes it a standout choice for blasting media. It can be utilized for cleaning, etching, and surface preparation of materials, such as metals and ceramics, before painting or coating. The robust nature of WFA ensures efficient removal of surface impurities without causing undue damage to the substrate material.

Coating and Polishing
In coating applications, WFA is used to create a rough surface on a substrate to enhance adhesion of the coating. In terms of polishing, its finely grained variants yield smooth and shiny surfaces on various materials, including metal, glass, and ceramics.

Grinding Applications
Due to its high hardness, WFA is often employed in grinding applications. It's used in the manufacture of grinding wheels, where its durability and sharp edges provide efficient material removal and a high-quality finish.

Cutting and Shaping
WFA is also used in cutting and shaping processes. Its hardness and toughness enable it to cut through hard materials with precision, making it an invaluable resource in industries ranging from construction to semiconductor manufacturing.

The Unique Properties of White Fused Alumina- WFA

High Purity

White fused alumina is made from high-quality aluminum oxide, resulting in a product with very low impurities, making it ideal for applications where purity is critical.

Hardness

It is known for its high Mohs hardness, making it suitable for abrasive applications that require cutting, grinding, or polishing hard materials.

Abrasive Properties

White fused alumina offers excellent abrasive properties, with sharp and durable grains, making it effective for metal, ceramic, and glass grinding and polishing.

High Melting Point

It has a high melting point, which makes it resistant to high-temperature applications such as refractories and ceramics.

Thermal Stability

It exhibits excellent thermal stability and can withstand high-temperature processes without significant deterioration.

Electrical Insulation

It has good electrical insulating properties, making it useful for applications in the electrical industry.

Low Friability

White fused alumina has low friability, which means the grains maintain their sharp edges and cutting efficiency for a longer time.

Controlled Particle Size

It can be manufactured in various particle sizes to suit different abrasive and industrial applications.

Comparing White Fused Alumina With Other Aluminum Oxides

Brown Fused Alumina (Bfa)

When compared to white fused alumina (WFA), brown fused alumina (BFA) is distinct in its lower purity and hardness. While BFA is still a very hard material, WFA's superior hardness makes it an ideal choice for more demanding applications. BFA has a higher level of impurities which can sometimes lead to inconsistent performance, while the high purity of WFA ensures consistent performance across applications.

Advantages Over Other Fused Minerals

WFA also boasts several advantages over other fused minerals. Its high thermal stability and resistance to chemical attacks outrank many other materials. This makes WFA particularly suitable for applications involving high temperatures and corrosive environments.

Electric Arc Furnaces

In the realm of electric arc furnaces, WFA plays a crucial role. Due to its excellent thermal properties, WFA is often used as a lining material for these furnaces. It can handle the extreme heat generated during the smelting process without degrading, thus prolonging the lifespan of the furnace.

Refractory Performance

Its impact on refractory performance is significant. WFA's high refractoriness, low thermal expansion, and high thermal conductivity contribute to improved performance of refractory materials, which are critical in high-temperature industrial processes.

Aluminum Industry

In the aluminum industry, WFA finds extensive applications. Given its hardness, it is used in the abrasive blasting of aluminum surfaces and in the manufacture of high alumina refractories. Furthermore, the chemical stability of WFA ensures no unwanted reactions occur during these processes.

How Does The Selection of White Fused Alumina Affect Industrial Processes?

Melting And Smelting
The selection of White Fused Alumina (WFA) significantly impacts melting and smelting operations in heavy industries. Its high thermal stability handles extreme temperatures, preventing the degradation of furnace lining and reducing the frequency of costly repairs or replacements.

Sandblasting Operations
In sandblasting operations, the hard, sharp edges of WFA grains offer quick and clean cuts, making it an ideal abrasive for treating aluminum surfaces. Its high purity levels decrease the likelihood of contamination, ensuring the finished product's quality and performance.

Effects On Temperature And Thermal Stability
The effects on temperature and thermal stability are noteworthy. WFA's high refractoriness, low thermal expansion, and high thermal conductivity help maintain stable temperatures in high-temperature industrial processes. This reduces the thermal stress on equipment, increasing its lifespan and reducing maintenance costs.

Laminate And Mineral Processing
WFA's role in laminate and mineral processing cannot be understated. Its hardness and chemical stability make it a preferred abrasive for grinding and shaping materials in these industries.

Ceramic And Glass Manufacturing
Lastly, in ceramic and glass manufacturing, WFA is used in shaping, grinding, and polishing processes. Its hardness and chemical stability prevent any unwanted chemical reactions, ensuring the purity and quality of the final product. This superior performance makes WFA an indispensable material in various industrial processes.

Our Factory

Zhengzhou mayjoy abrasives co., ltd mayjoy abrasives has been in the field of fused aluminum oxide over 20years, in the beginning, the director Mr. Feng only has 1 production line, it was hard. But after these years effort, he has more than 5 lines with two plants, and also set up a very professional exporting sales team since 2013, now working with America, South America, Southeast Asia, Europe, etc more than 30 countries.

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FAQ

Q: What is White Fused Alumina (WFA)?

A: White Fused Alumina (WFA) is a type of alumina that is highly pure and has a white color. It is made from high-quality industrial alumina in an electric arc furnace at high temperatures.

Q: What are the applications of WFA?

A: WFA is used in various industries such as abrasives, refractories, ceramics, and polishing. It is used for sandblasting, grinding, cutting, and surface finishing, among other applications.

Q: What is the pricing of WFA?

A: The pricing of WFA depends on various factors such as purity, size, and quantity. It typically ranges from $700 to $1500 per metric ton.

Q: What are the specifications of WFA?

A: The specifications of WFA are determined by its chemical composition, size, and physical properties. It typically has a purity of 99.5% or higher and a particle size range from 0.5 to 3mm.

Q: What are the advantages of using WFA as an abrasive?

A: WFA offers high hardness, toughness, and strength, making it highly effective in sharpening and grinding. It also has a low thermal expansion rate, which makes it resistant to thermal shocks and heat-related stresses.

Q: How is WFA different from Brown Fused Alumina (BFA)?

A: WFA is purer and has a higher hardness and toughness compared to BFA. BFA typically has a lower price point and is used in applications that require low iron and titanium content.

Q: Is WFA hazardous?

A: WFA is not classified as hazardous under OSHA or GHS regulations. However, it is important to follow proper safety precautions when handling it to prevent any potential harm.

Q: What is white corundum used for?

A: Its use in sanding charts, grinding wheels, vibration chips and compressed air blasting makes it a very common abrasive in the metal industry. The most common equipment for blasting with white or brown corundum is as follows: Manual suction and pressure blasting booths.

Q: What is the hardness of white corundum?

A: Although their Mohs hardness is 9.0, white corundum is even harder than brown corundum, and brown corundum is more flexible than white corundum. White corundum is suitable for grinding fine-grained abrasives such as high-carbon steel, high-speed steel and stainless steel.

Q: Is corundum rare or common?

A: In nature diamonds are rare, but not so in the gem world. Rubies and sapphires are different colored varieties of the mineral corundum. Now corundum is a fairly common mineral. Ranking a 9 on the Mohs scale of hardness (diamond is a 10), corundum has been mined extensively for abrasives.

Q: What 2 popular gemstones are made of corundum?

A: It is a rock-forming mineral. It is a naturally transparent material, but can have different colors depending on the presence of transition metal impurities in its crystalline structure. Corundum has two primary gem varieties: ruby and sapphire.

Q: How does corundum get its color?

A: THE Cr3+ CHROMOPHORE. Cr3+ is the trace element primarily responsible for coloring ruby red and sapphire pink (McClure, 1962) and in doing so creates some of the most beautiful gems in the world. This coloration results from Cr3+ ions replacing some of the Al3+ ions in the corundum lattice.

Q: What is the difference between brown aluminum oxide and white aluminum oxide?

A: Brown-fused aluminum oxide is a standard blasting abrasive while white-fused aluminum oxide is a high-purity abrasive for when the application requires minimal foreign contamination or higher friability.

Q: What is the composition of aluminium oxide?

A: Aluminium oxide (or aluminium(III) oxide) is a chemical compound of aluminium and oxygen with the chemical formula Al 2O 3.Brown aluminium oxide is a high-grade, high-purity alumina manufactured from the controlled melting of calcined bauxite, silica, coke and iron. Available in premium grades specifically approved for aerospace applications, conforming to specifications such as Rolls Royce CSS12, Airbus ABR9-0160 etc.

Q: What is the percent composition of aluminum oxide?

A: The atomic weight of Aluminum (Al) is 27. The atomic weight of Oxygen (O) is 16. Thus from the above conclusion we can say that The percent composition of Aluminum oxide (Al₂O₃) is 52.9 % of Al and 47.05 % of OBrown Fused Aluminum Oxides have a LOW friability, so it will break down slowly, and coarser sizes can be recycled multiple times. White Fused Aluminum Oxides have a HIGH friabilty, but the SAME HARDNESS rating of Brown Fused Aluminum Oxides.

Q: What is the difference between white alumina and brown alumina?

A: In summary, white fused alumina is known for its high purity and hardness, making it suitable for precision applications, while brown fused alumina is valued for its toughness and versatility in various abrasive applications.White – White is the most popular colour for aluminium doors and windows. The choice of white is often a neutral one, matching with almost any material or colour. Grey – A more modern look, grey can be used in conjunction with other colours on your home's exterior as well as internally to either match or contrast.

Q: What is the most common aluminium oxide?

A: Corundum

Aluminium oxides or aluminum oxides are a group of inorganic compounds with formulas including aluminium (Al) and oxygen (O). Aluminium(III) oxide (aluminium oxide), ( Al 2O 3), the most common form of aluminium oxide, occurring on the surface of aluminium and also in crystalline form as corundum, sapphire, and ruby.Aluminum oxide (Al2O3) is a compound of aluminum metal and oxygen used in the alpha alumina structural form. It is commonly referred to as alumina, a white high-hardness ceramic. Fully-dense alumina can be translucent.

Q: What is the main source of aluminium oxide?

A: The production of aluminum oxide is mainly from bauxite (the main aluminum ore), which is a mixture of various minerals including gibbsite (Al(OH)3, boehmite (γ−AlO(OH)), and diaspore (α−AlO(OH)) along with impurities of iron oxides, quartz, and silicates.Aluminium oxide is a thermally unstable and insoluble compound that occurs naturally in various minerals such as corundum, a crystalline variant of the oxide, and bauxite, which is considered as its principal aluminium ore .

Q: What is the difference between alumina and alumina oxide?

A: Aluminum Oxide (Al2O3), often abbreviated as Alumina, is one of the most popular fine ceramic material families worldwide. Encompassing a range of grades – characterized primarily by purity-coarse and dense alumina is renowned as one of the greatest materials in terms of price-to-performance ratios.

Q: What is the difference between white alumina and brown alumina?

A: In summary, white fused alumina is known for its high purity and hardness, making it suitable for precision applications, while brown fused alumina is valued for its toughness and versatility in various abrasive applications.Brown fused alumina is widely used as a raw material in refractories, ceramics shapes, grinding wheels, sandpaper, blasting media, metal preparation, laminates, coatings, lapping, polishing, grinding and hundreds of other applications.

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