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White Aluminum Oxide
White aluminum oxide all call white corundum, white electro corundum, it is smelted basis of alpha alumina, which is electrically fused in high temperature 2000℃. It is pure white and high hardness, but toughness lower than that of brown fused alumina. It is available for difference application and size, attractive price and fast delivery.
Description
Product Description
White aluminum oxide (also known as White Corundum) is made of industrial alumina powder as the main raw material, which is smelted in an electric arc furnace at a high temperature of more than 2000 degrees and then cooled. It is a high-purity synthetic mineral. After crushing and shaping, magnetic separation to remove iron, and sieving into various particle sizes. It has a dense texture, high hardness, sharp horn-shaped grains, high refractoriness, and is very hard and corrosion-resistant.
Product Specification
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Chemical Composition |
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Particle Size Range |
AL2O3(%) |
Na2O(%) |
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#12-#80 |
≥99.0 |
≤0.50 |
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#90-#150 |
≥98.50 |
≤0.60 |
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#180-#220 |
≥98.20 |
≤0.70 |
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Physical Property |
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Basic Minerals |
Crystal Size |
True Density |
Bulk Density |
Hardness |
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(UM) |
(g/cM³) |
(g/cM³) |
(kg/mM²) |
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a-AL2O3 |
600-1400 |
≥3.90 |
1.40-1.95 |
2200-2300 |
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Standard |
FEAP- F (Vitrified and Resinoid abrasives), FEPA- P (Coated abrasives), JIS standard |
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Grit |
F12 – F220(Macro). F240-F2000 (Micropowder), P12-220, P240-P2500 JIS12--8000 |
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For Refractory |
0-1mm, 1-3mm, 3-5mm, 0-10mm, 16-35mesh, -70F, -100F, -325mesh, Dust |
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Minimum Order Quantity |
100kgs |
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Delivery Time |
According to order quantity |
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Ingredient testing display
| Chemical Composition | Size Distribution | ||||||||
| Grit No. | AL2O3 | FE2O3 | NA2O | SIO2 | Coarest Grains | Coarer Grains | Basic Grains | Mix Grains | Fine Grains |
| WA46 | 99.46 | 0.04 | 0.26 | 0.03 | 0 | 22 | 50 | 78 | 0.5 |
| WA150 | 99.46 | 0.04 | 0.26 | 0.03 | 0 | 8 | 65 | 89 | 1 |
| WA180 | 99.31 | 0.04 | 0.28 | 0.04 | 0 | 7 | 65 | 86 | - |
WA400#
WA600#
WA700#
WA800#
Product Features
The hardness of White Aluminum Oxide is slightly higher than that of brown aluminium oxide, the toughness is slightly lower, the purity is high, the self-sharpening is good, the grinding ability is strong, the calorific value is small, the efficiency is high, the acid and alkali corrosion resistance, and the high temperature thermal stability is good. Made of white aluminum oxide sand, it is suitable for grinding fine-grained abrasives such as high carbon steel, high speed steel and stainless steel. White aluminum oxide segment sand can also be used for precision casting and advanced refractories.
Product application
The following are the common uses of white aluminum oxide
As a base material for abrasive blasting
This is due to its good corrosion resistance and wear resistance. In addition, white aluminum oxide has moderate hardness and good self-sharpening properties. As a sandblasting tool, white aluminum oxide will not affect the color of the workpiece and will not produce excessive residue, so there is no need for cleaning. Whether it is metal or non-metal, it can be polished, and it can also beautify the surface of jade, crystal, etc.
As raw material for grinding tools such as grinding wheels, sandpaper, and abrasive belts
Polishing and grinding of objects. Rust removal of metal surfaces, as well as processing of glass and acrylic materials.
As raw material for refractory materials
Because of its good corrosion resistance and relatively stable chemical properties, common white aluminum oxide refractory materials include high temperature coatings, refractory bricks, furnace lining materials, etc.
How to distinguish the quality of white aluminum oxide?
The alumina content determines the quality of white aluminum oxide. Generally, the higher the alumina content, the better the purity and quality of white aluminum oxide. When choosing white aluminum oxide, you need to understand the purity of white aluminum oxide to ensure the quality.
Compared with brown aluminum oxide, white aluminum oxide is harder. The hardness of white aluminum oxide also affects its quality. Therefore, when choosing white aluminum oxide, you must have a full understanding of its hardness.
The reason why black spots appear in white aluminum oxide
The black spots on white aluminum oxide may be caused by impurities that are not removed cleanly, or by impurities that are deliberately mixed. Rust is a common impurity, because the raw material of white aluminum oxide itself contains iron oxide. If it is not removed cleanly, there will be black spots. In addition, during the production process, rust may be accidentally added due to mechanical rust, which will eventually lead to the impure color of white aluminum oxide.
From a production perspective, if the smelting time is insufficient or the smelting process is immature, the purity of white aluminum oxide will be low, the impurity content will be high, and small black spots will be seen on the color.
Generally speaking, whether the color of white aluminum oxide is pure is one of the standards for testing the quality of white aluminum oxide. If the quality of white aluminum oxide does not meet the standard, it will greatly affect its performance, which is most obviously reflected in hardness and grinding force. Therefore, we must be strict and pay more attention during production.
White aluminum oxide is a variety of common abrasive corundum series in abrasive and grinding tool products. It is made of alumina powder as the main raw material through high-temperature smelting. The Al2O3 content is generally 97%-99% and it is white. White aluminum oxide has high hardness, the abrasive is not easy to be blunted, and its toughness is slightly inferior to that of brown corundum. The abrasive grains are easily broken under pressure to form new cutting edges. Because the abrasive hardness is higher than that of brown corundum and it is easy to cut into the workpiece material, and the abrasive grains have good self-sharpening performance, white aluminum oxide grinding tools have good cutting ability and can reduce the deformation and heat generation of the workpiece.
Therefore, white aluminum oxide abrasives are suitable for fine grinding, edge grinding, thread grinding and other forming grinding, as well as for grinding workpieces that are easy to deform and burn, such as fine grinding of hardened steel, high-speed steel, high-carbon steel and thin-walled parts. White aluminum oxide has a micro-blade structure and is suitable for mirror grinding. At the same time, white aluminum oxide also has the characteristics of acid and alkali corrosion resistance, high temperature resistance, and good thermal stability. It is widely used in high-tech fields such as precision casting, steel refractory, chemical refractory, special ceramics, daily life ceramics, military industry, electronics, etc.
The sodium oxide content in ordinary white aluminum oxide is between 0.2% and 0.6%. Sodium oxide is a harmful impurity for white aluminum oxide. It generates β-Al2O3 with alumina in the molten state, and the amount generated increases with the increase of sodium oxide content.
With the rapid development of high-end abrasives, electronic ceramics and high-end refractory markets, reducing the sodium content in white aluminum oxide has become an important research direction for improving the quality of white aluminum oxide. There are many ways to remove sodium from white aluminum oxide, such as removing sodium from raw materials, directly purchasing low-sodium industrial alumina raw materials, or removing sodium from high-sodium alumina raw materials, but these methods will increase costs, so it is difficult to use them on a large scale in corundum production enterprises.
The influence of white aluminum oxide on the surface structure of grinding wheel and abrasive tool
While testing the hardness and crack resistance of the white aluminum oxide grinding wheel, the porosity and structural unevenness of the white aluminum oxide grinding wheel must also be tested. Therefore, in order to obtain more complete abrasive tool characteristics and better determine the cutting ability of the white aluminum oxide grinding wheel, it is possible to add pore volume size characteristics and their testing methods to the various white aluminum oxide grinding wheel quality indicators currently tested. The volume size characteristics of abrasive tool pores include several structural and quality indicators of the white aluminum oxide grinding wheel, such as the total volume of pores, pore size, pore depth on the surface of the white aluminum oxide grinding wheel, and the distribution of pores in the white aluminum oxide grinding wheel. In order to test this new characteristic indicator, the corresponding testing instrument should be used.
The white aluminum oxide grinding wheel is a porous structure because there is an air layer in the mold material injected into the model, just like all loosely consolidated crystals. This air layer is compressed as the mold material is compacted during the green compaction. At this time, part of the air remains in the mold body after demolding to form pores. The other part of the air overflows from the mold material and forms channels or pore paths that connect the pores to each other and to the surface, thus forming the initial pores and pore path system.
Whether the pore system in the white aluminum oxide grinding wheel exists can be confirmed by the above permeability test of the abrasive blank. At this time, it is found that when the pressure is not supplemented, the permeability of the two ends of the abrasive is different, that is, the permeability of the compacted side is relatively small, while the permeability of the other side is relatively large. This is because the molded material of the compacted surface is pressed more tightly, so that the amount of air that comes out of the molded material on this end face is also more, thus reducing the number of pores. When the molded material is not stirred well or the molded material is unevenly distributed in some places in the model, the concentration of abrasive particles and binders will be uneven. When the blank is pressed, this phenomenon will lead to different compaction degrees in individual parts of the molded material, different amounts of extruded air, and the formation of pores and pore paths of different sizes. This is the unevenness of the structure of the white aluminum oxide grinding wheel. This phenomenon can be explained by the different permeabilities of various parts of the abrasive.
Various components of the binder, such as clay, talc, feldspar and water glass, all have compounds that can be burned out or evaporated at high temperatures. Therefore, during the sintering of the abrasive blank at a temperature of 1250-1300 degrees, the burned out and evaporated compounds form gas in the blank. This gas tries to expand under the influence of high temperature and thus combines into a single space. Due to the inhalation of the newly generated gas, these spaces continue to increase, compacting the sintered binder to form pores. The gas space breaks through the binder at the thinnest part of the cross section and combines with other gas spaces to form a channel, namely the pore path.
Our Service
Create efficient and comprehensive solutions
01
Pre-sale service
Conduct product consultation,product promotion and marketing activities,and technical support for customer needs.
02
After-sales service
Installation and commissioning of specific products;Respond to consumer questions,answer consumer inquiries,and deal with consumer comments.
03
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Response to the requirements and issues immediately.
Our Package
Everything You Need to Know
If you have any questions, please contact customer service and we will reply you in time.
Samples are free?
Yes, we could provide samples with free of cost.
How many days for sampling?
7~10 days for regular size we have.
How many days for production?
30~60 days according to the size and quantity.
Could we put our own logo?
Sure, customers logo can be made by laser engraved embossed transfer printing.
We are always at your service when you need
Renwa Abrasive is one reliable manufacturer of abrasives and related industries, we focus to provide one-stop solutions for grinding, cutting, and polishing, 20 years of experience make us one of the most potential companies in the abrasive fields.
Choosing our products is not only choosing a physical object, but also a peace of mind and security. We are committed to making you feel our dedication and sincerity in every aspect of using our products, making your choice more assured and more worthwhile.
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