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Magnesium Metal Powder

magnesium metal powder is used for the production of pyrotechnic and signal flares. It is also used in the production of high-power light sources.

It is a soft, white powder that can be used as a lubricant in many applications. For example, it can be used by gymnasts to prevent their hands from sweating when lifting equipment. It can also be used in pharmacological manufacture to ensure that tablets do not stick together.

Uses for magnesium powder:

It can be oxidized to form magnesium oxide, which is a very good anti-corrosion material. It can also be reacted with sulfur to produce magnesium sulfate, a common chemical used in antiseptics and disinfectants.

This can be used to make strong alloys for various industrial applications. It is also a reducing agent in ruthenium(III) complex catalyzed atom-transfer radical addition (ATRA) and cyclization reactions.

The reaction is not as vigorous as that of sodium or lithium.

Magnesium hydride is under investigation as a way to store hydrogen. It is formed by the reduction of upgraded titania slag under a hydrogen atmosphere.

The process is similar to that of producing aluminum powders. It is a polydisperse powder and has a particle size from several microns up to 0.5-1 mm.

2023-04-03

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Introduction to Amorphous Boron Powder

What's Amorphous Powder
Amorphous Boron Pulp is an odorless brown powder. This is due to the random order in which its boron atoms are bonded together. It is darker than crystalline boron and is extremely hard. According to 1979 international standards, the atomic weight for boron was 10.81. Its melting temperature is 2300 +-2 Fahrenheit:2550 . Specific gravity between 2.34 and 2.37
It is insoluble with water, hydrochloric Acid, ethanol, and the ether. However it can be dissolved in cold concentrated acid solution to decompose Hydrogen.
Boron is a rare metal-non-metal combination in the periodic tables. It exhibits strong negative electricity, small atomic radius and concentrated nuclear charge. Stable at room temperature; can be heated to 300F and burned at 700F; tasteless and odorless; non-metallic characteristics similar to silicon. Boron can interact at high temperatures with oxygen, nitrogen and sulfur; can be combined directly with many metals to make boride.

What does Boron Powder be used for?

Amorphous Boron's chemical properties are more active than those of crystalline Boron. Crystalline Boron is so hard that it's often used in place of diamond for cutting tools and drilling. Amorphous Boron powder is an important source of energy. Amorphous boron powder is a solid fuel for composite solid propellants. Its calorific values are more than twice those of carbon, aluminum, and magnesium. Its volumetric calorific worth is nearly three times that that of hydrocarbon fuel and it has a density that is just slightly less than that of aluminium. Boron should be the most non-metallic source of energy. Amorphous boron's ignition temperature is significantly lower due to its irregular shape, large surface area and low melting point.
Amorphous Boron Powder material could be used for (not only but also)
1.As an ideal solid propellant for composite solid fuel. The calorific factor is high. (It is nearly three times more calorific than hydrocarbon fuels, twice as many as carbon, twice as many as aluminum, and twice as dense as magnesium. Boron is the best nonmetallic fuel in terms of energy. Amorphous boron's ignition temperature drops dramatically due to its irregular shape and large specific area.

2. To prevent metals' oxidization at high temperatures

3.As part of an alloy to improve properties of metals.
You can use it as a compound, or as an additive to other alloys. It can be used as a compound or an addition to alloys. Boron and its components can be used to replace precious and rare metals and as catalysts in organic chemical reaction.
Lanthanum bore is used in over 20 military and high-tech industries, such as radars, aerospace, electronic industry instruments, instruments, medical devices home appliances, metallurgy and environmental protection.
Boride Ceramics is widely used in the areas metallurgy electronics medicine ceramics nuclear industry chemical industry. It has higher wear resistance and corrosion resistance.
Magnesium Dboride Powder,MgB2 superconductor is the most critical temperature. Its superconducting temperature is 39K. -234 . Magnesium Diboride, a new superconductor material, opens up new possibilities for studying a new class of high-temperature semiconductors.

price of amorphous Boron powder
Price is affected by many factors, including supply and demand in a market, industry trends and economic activity.
You can email us to request a quote for the latest price . (brad@ihpa.net)

Amorphous Boron powder supplier
Technology Co. Ltd. is a trusted global supplier of chemical materials and manufacturer with over 12 years experience in manufacturing super high-quality chemicals, including silicon powder.
Send us an inquiry if you're looking for high quality Amorphousboron Powder. (brad@ihpa.net)

2023-04-03

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What is Amorphous Boron B Powder?

What is it? Boron Powder Amorphous ? Boron B is rarely found in nature as a pure element, but it can be found in the form proboric acid or borate. Boron is present in only 0.001% the earth's crust. Elemental boron can be found as a black or dark brown powder. Amorphous boron dust This powder is an odorless, dark brown powder. It is stable at room temperatures and can be oxidized to 300°C and ignited to 700°C. It is used extensively in metallurgy and synthesis as well as aerospace. It is often used as a catalyst for rocket fuel ignition, deoxidizer, and automobile airbag initator.

Amorphous Boron powder has physicochemical properties
Mr10.81
Boron has a bandgap between 1.50 and 1.56eV which is greater than silicon or germanium. It can transmit infrared radiation. While boron can conduct electricity well at high temperatures, it is less efficient at room temperature. Boron, which is also heavier than beryllium, has the highest volume of heat. It is slightly insoluble, but not insoluble, in nitric and water.
The formation and preservation of boron trioxide films is important to prevent further oxidation. It reacts well with fluorine at room temperatures and is not corroded or effected by hydrochloric and hydrofluoric acids aqueous solutions. Boron is insoluble when it comes into contact with water. However, in powder form, it can be dissolved in boiling nitric acid and sulfuric acid.
Amorphous Boron It is chemically active. Amorphous Boron Powder can make an explosive mixture with oxygen.

Properties of Amorphous Boron Powder
Other names	Boron;
CAS No.	7440-42-8
Formula compound	B
Molecular Weight	10.811
Appearance	dark brown
Melting Point	2079degC
Boiling Point	2550degC
Density	2.34 g/cm3
Solubility of H2O	Insoluble
Exact Mass	N/A

Amorphous Boron Powder CAS 7440-42-48

Amorphous Boron Powder preparation:
Borane cracking (molten salt electrolysis), hydrogen reduction, thermal degradation, magnesium thermal reduction and thermite removal
Magnesium thermal-reduction method: Use B2O3 for the raw material and Mg powder for the reducing agent. Self-spreading magnesium thermal reduction reaction is used to get reduction products. The ultra-fine amorphous powder of boron is obtained by hydrochloric Acid leaching.

Amorphous Boron powder:
Amorphous boron dust Many advantages include a large specific surface, high calorific value, and ease of transport. It is used widely in many fields, such as military and aviation as well as aerospace and automobile.
Amorphous boron dust This is the main use of Boron in high-energy fuels, boroncontaining functional ceramics and space technology. Boron is a good degassing agent for steelmaking because it reacts with nitrogen and oxygen at high temperature. Boron fiber is very strong and composite materials made out of epoxy resin are used to make rockets, missiles and aircraft. It is also used in the atomic energy sector as a protective substance.

Amorphous Boron Powder - Main Supplier
Technology Co. Ltd. is a trusted global supplier and manufacturer of chemical materials. We have more than 12 years experience in providing high-quality chemicals, Nanomaterials, and graphite powder.
If you're looking for Amorphous Boron B powder of high quality Send us an inquiry and contact us.

2023-04-02

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Nano Al Powder Usually Requires Surface Coating

The characteristics of nano-al powder include a small particle size, high specific surface area, and high surface energy. This powder is used widely in the formulations of thermite as well as propellant and pyrotechnics powder. The development of nanotechnology has made nano-aluminum a more active research area. It is now capable of producing better results than traditional aluminum powder.
Why are Nano Al Powder surfaces coated?

Nano Al Powder's activity is expected to be low and less affected by environmental factors, such as temperature and humidity. The product should be stable for a long period of time. However, aluminum, a type of Active metal materials, can easily react with oxygen in the air to form a layer aluminum oxide film that covers the Nano Al Powder. This reduces the energy release of Nano Al Powder. In order to avoid dispersion or homogenization in this system, researchers at home and overseas have used the technique of coating and modifying the surface of Nano-Aluminum Powder to improve their results in the area of energetic materials.

Analysis on Nano Al Powder Surface Coating Technology

Nano Al Powder currently surfaces using a combination of in-situ and top passivation.

1. Nano Al Powder surface passivation and coating

1.1 Passivation mechanism. The strong induced Dipole/dipole interaction means that unpassivated, charged particles remain in dispersion media (Ar). The diffusion of uncharged particles with Ar results in electrons being transported from the metal surface to the oxidant. However, the oxidant (protonH+), is transported through the interface metal-oxide. Electrostatic fields are created when positive-charged particles accumulate and stop the redox reaction. The redox reaction is strengthened before the negative charge is fully recovered. The additional metal will be oxidized in order to stabilize and increase the electric field.
1.2 Significance and significance of passivation. Although passivation improves nano-aluminum's oxidation resistance, this shell layer does not contribute to energy release. It is essential to fully consider the preparation of nano-aluminum dust, as well as the particle size, type, structure, thickness and so on. The shell layer of the surface coating is essential for determining the activity control performance and anti-oxidation performance.

2. Nano Al Powder in-situ coating

2.1 Electric explosion method
The electric explosion technique involves using a pulse current having an energy density of 1.0x (106109)A/cm2 upon the aluminum wire. The aluminum wire is heated up and melted immediately, then vaporized under the form of an explosion. Finally, the product is dispersed within an inert atmosphere, where it is cooled to make Nano-aluminum particle. In-situ coating with electric explosion is primarily concerned with the following three aspects. (1) The active aluminum content of the Nano-aluminum Powder must reach the micron level (95 to 98%); (2) The propellant's performance will be significantly improved by the high nano-aluminum content. (3) The propellant's combustion performance is improved by coating modification. This prevents nano-aluminum from oxidation inactivation. should have a promotion effect. Table 1 lists the most common coating materials used for surface modification on nano-aluminum powder.
2.2 The wet chemical method
The wet chemical procedure uses tertiary aluminum hydride to undergo decomposition under the control of titanium isopropoxide to create nano-aluminum. The solution will turn dark brown once the catalyst has been added. A coating can prevent nanoaluminum powder agglomerating during the process of turning to black. The container wall eventually forms nano-aluminum mixture composite particles.
This method allows for the safe processing of active aluminum powder in liquid. Decomposition rates of tertiary aluminum aluminum hydride and time for organic coating play a major role in the formation of aluminum powder as well as the morphology and size of the composite particles. Other effects of organic matter may also be possible. You can also see that the shell coating is responsible for forming a protective coating on nano-aluminum powder's surface. Other than the role of coating the surface, different organic coatings can also have different effects. Future research should focus on the mechanism of operation.

Tech Co., Ltd. is a professional Al powder supplier. It has over 12 years' experience in chemical product development and research. We accept credit cards, T/T and Paypal payments. We will ship goods overseas via FedEx, DHL and by air or sea to our customers.

2023-04-02

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What is Zirconium Silicide?

What is it? Zirconium Silicide ? Zirconium Silicide is a zirconium/silicon intermetallic compounds. It is a ceramic material of high temperature with excellent hardness, melting point, electrical conductivity, thermal conductivity and thermal shock resistance. It is both a structural material and a new type engineering material that can be used with high-temperature, corrosive media.
These are the main features of Zirconium Silicide
Zirconium Silicide is a metallic gray orthorhombic, shiny crystal having a relative density of 4.8822. Zirconium Silicide is insoluble with water, mineral acids, and aqua regia. It is however, soluble in hydrofluoric Acid.

Zirconium Silicide Properties
Other Titles	zirconium(IV) silicide, zirconium disilicide, ZrSi2 powder
No.	12039-90-6
Combination Formula	ZrSi2
Molecular Weight	147.4
Appearance	Gray Black Powder
Melting Point	N/A
Boiling Point	N/A
Density	4.88 g/cm3
Solubility of H2O	N/A
Exact	145.858557

Zirconium Silicide Zi2 Powder CAS 12039-9

Zirconium Silicide applications
It is used as a fine ceramic raw material powder to produce crucibles that are used in the production of semiconductor thin film production.
Production of Zirconium Silicium
A method to prepare zirconium silicide Nanomaterials. This involves: (1) adding 5mmol Zirconium dioxide, 50mmol of titanium powder, and 50mmol each of zirconium silicide into a 20 milliliter stainless steel Autoclave. Next, sealing the autoclave with a lid and placing it into an Electric Furnace that heats up. After the temperature rises to 600°C, the reaction continues for 40 hours before being naturally cooled to room temperatures.
(2) The reaction product was washed twice with distilled waters, followed by a wash with dilute hydrochloric acids and dehydrated ethanol. Finally, the product was filtered and dried for 4 hours in a vacuum drying chamber at 60°C to produce zirconium silicide nanometers.
The main supplier of Zirconium Silicide
Tech Co., Ltd. () is a professional silicide egg Over 12 years' experience in chemical product development and research. We accept credit cards, T/T and West Union payments. We will ship goods overseas via FedEx, DHL and by air or sea to our customers.
You can find high-quality powdered boron carbide here Please contact us Send an inquiry

2023-04-01

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What is Spherical Quartz Powder?

What is it? Spherical Quartz Powder ? Spherical quartz powder, made from quartz stone, is obtained after purification. Amorphous powder is made from irregularly angular particle into regular spherical particles.
The key features of Spherical Quartz Powder
Spherical quartz powder offers the benefits of a smooth surface and large specific surface area. It also has high hardness and stability. The first is that the spherical material has good fluidity. It can also be mixed with resin evenly to form a film. The greater the amount of quartz powder used to fill the mold, the lower its thermal conductivity. Also, the molding compound's thermal expansion coefficient will be smaller. Additionally, single crystal silicon has a higher thermal expansion coefficient. This will improve the performance of electronic components. Second, the stress in spherical powder is less than half that of angular powder. Furthermore, the molding compound made with spherical Quartz powder has the lowest stress concentration, and the strongest. The surface of spherical quartz powder is smooth, with a small friction coefficient and minimal wear to the mold, which can increase the mold's useful life by more than one-third.

Spherical Quartz Powder Spherical SiO2 Properties
Other Titles	Fused quartz, spherial quartz, spherical SiO2, silica
No.	7631-86-9
Combination Formula	SiO2
Molecular Weight	60.09
Appearance	Powder White
Melting Point	1,600deg C (2,912deg F)
Solubility of in water	N/A
Density	2533 kg/m3
Purity	99.5-99.9%
Particle size	10-30nm
Boling Point	2,230deg C (4,046deg F)
Specific heat	N/A
Thermal Conductivity	N/A
Thermal Expansion	N/A
Young’s Modulus	N/A
Exact	59.9668 g/mol
Monoisotopic	59.967 D

Spherical Quartz Powder Spherical SiO2

Spherical Quartz powder's uses
Spherical quartz powder can be used in many different applications. Electronic packaging is one of the most popular uses. Electronic packaging is an industry that supports integrated circuits. As integrated circuits become more sophisticated, the requirements for packaging materials are rising. Packaging forms are continually optimized and up-dated to meet these new requirements. The main components of electronic packaging include substrate material, plastic packing material, lead frame, and solder. Plastic packaging is a low-cost and easy-to-make product that can be mass produced in large quantities. This has helped it grow rapidly. Plastic packaging is responsible for 95% worldwide integrated circuit market. %above. EMC is the main plastic encapsulant. It houses more than 95% microelectronic component.
1. Microelectronic packaging must be able to withstand high levels of moisture, stress, low alpha-rays, dip soldering, reflow soldering, and plastic sealing. To address this issue, epoxy molding compounds must be doped in the resin matrix with inorganic materials. The majority of inorganic materials currently used are quartz micropowder, or silicon micropowder. Large-scale and ultra-large scale integrated circuits now have more stringent requirements for packaging materials due to their rapid growth. Quartz powder, an important support material for EMC requires that its particle size be within the required packaging range. Additionally, it must be pure. High and low radioactive elements are essential for particle shape. Spheroidization requirements apply to quartz powder.
2. Spherical silicon nanopowder has a great shape and can also meet many technical requirements for high-end integrated circuits. Its use can significantly reduce the thermal expansion coefficient and dielectric constant of plastic sealing materials. Also, it has a great rigidity, weather resistance resistance, impact resistance and compression resistance. The products also have excellent arc resistance insulation properties, UV radiation resistance and UV radiation resistance. In addition to its main use in electronic packaging, spherical Quartz powder can be used extensively in the manufacture and processing of advanced precision ceramics, electronic inks, optical fibres, high-end cosmetics, precision grinding optical devices and components, as well as in fillers for special paint coats.
The main supplier of Spherical Quartz Powder
Tech Co., Ltd. () is a professional oxide powder Over 12 years' experience in chemical products development and research. We accept credit cards, T/T and West Union payments. We will ship goods overseas via FedEx, DHL and by air or sea to our customers.
You can find high-quality powdered boron carbide here Please contact us Send an inquiry

2023-04-01

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Reasons for Spheroidization of Spherical Quartz Powder

What is spherical Quartz Powder?

Spherical Quartz Powder, also known by spherical Silica Powder, is an amorphous powder of quartz that has particles that are spherical in form and whose main constituent is silicon dioxide.

Spherical quartz is used primarily for copper clad laminations and epoxy mold compound fillers within large-scale integrated circuit packaging. However, it also has applications across high-tech areas such as aerospace and fine chemicals.

Why is Quartz Powder Spheroidized

1. The surface area of the ball has the lowest value, isotropy is high, film is well mixed with resin, resin is added in small amounts, fluidity is best, filling powder can be as high as 90%, and mass ratios can reach up to 90.5%. The filling speed of silica micropowder can be increased.

The filling rate for silicon micropowder is higher, but the plastic sealing compound's thermal expansion coefficient is lower. The thermal conductivity of the plastic sealing material is also lower, so it's closer to monocrystalline silicon. This will result in better performance.

2. The strength and stress concentration of the plastic sealing compound made from spherical dust is the lowest. The plastic sealing compound made of spherical is stronger than the one made from angular. It has a stress level of 0.6. When the spherical dust plastic sealing compound is used to encapsulate the integrated circuit chips, the yield is High. This makes it difficult to cause mechanical damage during transportation, installation and use.

3. Spherical powder's friction coefficient is low, so the mold wear is very minimal. The mold also has a long service-life. The service life of the mold is doubled when compared to angular powder. The cost of plastic sealing compound packaging molds is high. It is therefore necessary for some to be imported.

4. Silicon micropowder has the ability to strengthen epoxy resin. Spherical powder can also enhance this effect.

Tech Co., Ltd. is a professional supplier spherical powder with more than 12 years of chemical product development and research experience. We accept credit cards, T/T and Paypal payments. We will ship goods overseas via FedEx, DHL and by air or sea to our customers.

Send us an inquiry if you're looking for high-quality spherical Quartz powder.

2023-04-01

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Application Fields of Spherical Quartz Powder

What is spherical Quartz Powder?

The excellent properties of spherical powdered quartz include a smooth surface and large specific surface area. They also have high hardness and stability. First, the spherical material is very fluid and can be mixed evenly with the resin to form the film. Although the amount of resin used is minimal, the quartz powder filling volume can be high and may reach as high as 90.5%. The thermal conductivity of the molding compound will be lower if the quartz powder is used as a filler. The performance of electronic components that are produced is better when they are close to monocrystalline silicon's temperature expansion coefficient. The stress of the powder spherical is only 60% lower than the stress of the powder angular. Furthermore, the strength and stress concentration of the plastic molding compound made with spherical Quartz powder are the lowest and best. The spherical material has a smooth, low friction coefficient and wear-resistant surface that can help extend the mold's life.

Spherical quartz powder's main applications

There are many uses for sphered quartz powder. Electronic packaging is the biggest market for this product. Electronic packaging is the support industry for integrated circuits. As integrated circuits become more complex, the requirements for packaging materials are rising. Packaging forms are continually optimized and up-dated to meet these new requirements. The main materials for electronic packaging include substrate materials, plastic materials, lead frames, and solder. Plastic packaging has grown rapidly because of its simplicity, cost-effectiveness, and ability to be mass-produced. Plastic packaging is responsible for 95% global integrated circuits market.

Spherical silica powder is not only beautiful in form, but also has high chemical purity. It can be used to meet the technical requirements of high end integrated circuits. It can be used to reduce the plastic packaging material's thermal expansion coefficient and dielectric constant. The earth increases the product's rigidity and abrasion resistance. It also reduces impact resistance, weather resistance. compression resistance, moisture resistance and flame resistance. This makes it an essential key material for electronic packages. Spherical quartz can be used for electronic packaging.

Tech Co., Ltd. is a professional spherical powder supplier. It has over 12 years' experience in chemical product development and research. We accept credit cards, T/T and Paypal payments. We will ship goods overseas via FedEx, DHL and by air or sea to our customers.

Send us an inquiry if you're looking for high-quality spherical Quartz powder.

2023-03-31

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The Main Preparation Methods of 3D Printing Metal Powder

3D printing represents a new form of printing technology. 3D printing metal powder, the most important material for 3D-printing metal parts, is 3D printing. The main 3D powder materials currently available are nickel-titanium alloy powder Steel, stainless, industrial, steel, cobaltchromium alloys, bronze alloy, titanium alloy, nickel-aluminum alloy, etc.
3D printing of metal powder requires good plasticity.

Three types of preparation for 3D printing metal powder are available: reduction method, electrolysis, grinding method, and atomization method. At the moment, China's two most common pulverizing processes are the argon-atomization method and the plasma rotating electrode method.

1. Argon atomization
Argon atomization is a powder-making method that uses the fast flowing, argon gas flow to strike the metal liquid, then break it into small particles and finally condense into a solid powder.

2. Plasma rotating electrode method
Plasma state is also known as the fourth state. The process of plasma rotating electro atomization (prep) is simple: The metal or alloy is made into consumable, then the liquid film is melted under the coaxial plasma heating source to form liquid. The liquid film is then thrown away at high speed to form droplets. Under the action shear stress, the molten dropslet cools down and solidifies under surface tension.

The following are some of the benefits of plasma rotating electrode metal powder:

High sphericity with a smooth surface and high loose densities, which means that the uniformity and density of powder printing is excellent. There is no hollow powder or satellite powder. Also, there are no air gaps, entanglement, precipitation pores, cracks, or other defects in the printing process.

Tech Co., Ltd. () is a professional 3D printing metal powders Over 12 years experience in the development and research of chemical products. We accept credit cards, T/T and Paypal payments. We will ship goods overseas via FedEx, DHL and by air or sea to our customers.

You can find high-quality 3D printing powder in metal powder here. Get in touch Send an inquiry

2023-03-30

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The applications of Spherical Aluminum Oxide Powder

Overview Spherical Al Oxide Powder
Alumina is an inorganic substance with the chemical formula Al2O3.It is a high-hardness compound and is also called bauxite in mining,ceramics and materials science.It is a white solid insoluble in water,odorless,tasteless,and very hard in nature.It is easy to absorb moisture but does not deliquescence (non-hygroscopic after burning).Alumina is a typical amphoteric oxide (corundum is alpha-shaped and belongs to the most densely packed hexagonal compound.It is an inert compound,slightly soluble in acid and alkali and corrosion resistant. It is easily soluble in alkaline solutions and inorganic acid, but almost insoluble when mixed with water.

Spherical Al2O3 Powder CAS 344-28-1

What are the uses for Spherical Aluminum Oxide Powder
1.Paints: Wear-resistant paint, porcelain paint, plasma spraying.
2.Ceramics:transparent ceramics, bio-ceramics and alumina ceramics.
3.Petrochemical products: High-efficiency catalysts, catalyst carrier and automotive exhaust gases purification materials.
4.Polishing materials: sub-micron/nano-level abrasive materials,single crystal silicon wafer polishing, precision polishing materials.
5.Illumination: Long afterglow phosphor raw materials and rare earth three-color phosphor raw materialshigh-pressure sodium lamp tubes, LED lights, etc.
6.Electronic Products: integrated circuit substrates and single crystal materials.
7.Cosmetics - cosmetic fillers
8.Inorganic membrane material.
Alumina Al2O3 is suitable to be used for both wet or dry treatment. It can be used to grind the surface of any piece of workpiece. It is the most affordable abrasive. This type of synthetic abrasive, which is water chestnut and sharp, has a hardness that rivals diamond. It can also be used when iron pollution restrictions are high. This abrasive is used to do the most rough work. However, it can also make a pebble to be used to cut precise-sized pieces to obtain extremely low levels of roughness. Because of its high density and sharpness along with its rhombohedral structure it is one the fastest-cutting abrasives.
The main supplier of Powder Spherical Aluminum Oxide
Tech Co., Ltd. () is a professional oxide powder Over 12 years' experience in chemical product development and research. We accept credit cards, T/T and West Union payments. We will ship goods overseas via FedEx, DHL and by air or sea to our customers.
You can find high-quality powdered boron carbide here Please contact us Send an inquiry

2023-03-30

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