What is Thermal Alumina
Thermal aluminum nitride is a kind of advanced thermal conductivity material, not only has the characteristics of ceramic insulation, low thermal expansion, but also has the thermal conductivity of metal copper aluminum, its thermal conductivity is 7~ 10 times of alumina, mechanical properties and alumina ceramics, but also has similar thermal expansion coefficient with silicon.Aluminum nitride powder is mainly used to make power semiconductor chip support and heat dissipation substrate, and is widely used in communication base station, automobile, high-speed rail and power grid, consumer electronics, national defense and other fields.
Advantages of Thermal Alumina
Chemical resistance
They are highly resistant to chemical corrosion and can endure exposure to many aggressive chemicals, acids, and alkalis without degradation. This property is advantageous in chemical processing and the handling of corrosive substances.
High hardness
Alumina are renowned for their exceptional hardness, ranking just below diamonds on the mohs scale. This property makes them highly resistant to abrasion and wear, allowing them to maintain their integrity in demanding environments.
Biocompatibility
In the medical field, alumina are utilized in orthopedic implants and dental applications due to their biocompatibility and resistance to bodily fluids.
Excellent mechanical strength
They exhibit impressive mechanical strength, ensuring they can withstand heavy loads and mechanical stress without deformation or failure. This property is crucial in applications where structural integrity is paramount.
Exceptional electrical insulation
Alumina are excellent electrical insulators, making them indispensable in electronic and electrical applications. They can efficiently prevent the flow of electricity, making them suitable for insulating components and substrates.
Superb thermal stability
Alumina excel at maintaining their structural and mechanical properties at high temperatures, withstanding temperatures well above 1,000 degrees celsius. This characteristic is invaluable in applications involving extreme heat.
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Aluminum nitride is a kind of advanced thermal conductivity material, not only has the
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Spherical alumina powder has spherical and angular compact crystal structure, has good
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Our Factory
Chalco has two production bases of Alumina chemicals: Chalco Shandong and Chalco Zhongzhou. Both plants possess the complete chain including mining, refining, processing, R&D, and manufacturing. Total capacity of Alumina chemicals has reached up to 1,200,000 tons per year.
Production Equipment
Both plants, Chalco Shandong and Chalco Zhongzhou, possess the complete chain including mining, refining, processing, R&D, manufacturing and logistics.
Our Product
Ordinary Aluminium Hydroxide, High Whiteness Aluminium Hydroxide for filler, Ultra Fine Aluminium Hydroxide, Zeolite, Calcined Alumina, Activated alumina, Pseudo-boehmite, Poly Aluminum Chloride.
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We create and develop solutions as per our client's demands on alumina chemicals.
Application of Thermal Alumina
Because of its hardness, bioinertia and chemical properties, alumina is the preferred material for hip replacement bearings, such as prosthetics, bionic implants, prosthetic eye substitutes, tissue reinforcements, crowns, abutments, bridges and other dental implants. It is also used in laboratory equipment and tools, such as crucibles, furnaces and other laboratory appliances.
The strength and lightweight properties of alumina help enhance bulletproof vests, such as breastplate, as well as vehicle and aircraft armor, which is its largest market. Alumina is also used in synthetic sapphire bulletproof windows and ballistics.
Its high melting point and boiling point, as well as excellent heat resistance, make alumina an ideal material for making insulation and electrical insulators for high temperature furnaces. Alumina film is also an important part of the microchip industry. Some of its other uses include spark plug insulators, microelectronic substrates and insulated radiators.
Alumina is a valuable element for the formation of rubies and sapphires. Its crystalline form corundum is the basic element of these precious gems. The deep red color of the ruby is attributed to chromium impurities, while the different colors of the sapphire come from traces of iron and titanium.
Because alumina is chemically inert, it is used as a filler for plastics, bricks and other heavy clay utensils such as kilns. Because of its high strength and hardness, it is often used as an abrasive for sandpaper. It is also an economic substitute for industrial diamonds.
Several Production Methods of Thermal Alumina
Bayer Process
Bayer process is the most widely used method of producing alumina. It involves the following steps:
●Crushing: Bauxite ore is first crushed and mixed with sodium hydroxide to form a slurry.
●Heating: The slurry is then heated under pressure to dissolve alumina content, leaving behind impurities.
●Precipitation: The alumina is then precipitated out of the solution and calcined to remove any remaining moisture.
Production of alumina by Bayer process
The Bayer process is advantageous because it produces high-purity alumina and can use a range of bauxite ores with different chemical compositions. Additionally, the process is relatively simple and does not require high temperatures or pressures.
Sintering
Sintering is a process of compacting and forming a solid mass of material using heat or pressure without melting it. In the preparation of alumina, sintering involves:
●Mixing: Mixing alumina powder with additives such as binders and lubricants.
●Pressing: The mixture is then pressed into a mold and heated in a furnace.
●Heating: The heat causes the powder to fuse together, forming a solid mass.
The advantage of sintering is that it allows for the production of complex shapes and can be used to create porous or dense materials.
Hydrothermal Synthesis
Hydrothermal synthesis is a method of making alumina by reacting aluminum hydroxide (Al(OH)3) with water at high temperatures and pressures. Here is the manufacturing process.
●Mixing: Mix aluminum hydroxide with water in a sealed container to create a slurry. The water acts as a solvent and is necessary for the hydrothermal reaction to occur.
●Heating: The mixture is then heated to high temperatures and pressures, causing the reaction to start. The chemical equation for this reaction is 2Al(OH)3 → Al2O3 + 3H2O.
Hydrothermal synthesis is beneficial since it can produce high-purity, nano-sized alumina particles with specific shapes and sizes.
Sol-gel Process
The Sol-Gel process involves converting a liquid solution into a solid gel, which is then calcined to form alumina. The process involves:
●Mixing: Mixing aluminum alkoxide with a solvent to form a sol.
●Bonding: The sol is then aged to allow the particles to bond together, forming a gel.
●Calcination: The gel is then calcined at high temperatures to form alumina.
The Sol-Gel process offers several benefits because it can produce high-purity, homogeneous alumina with specific properties, such as a high surface area and pore size.
The Role of Spherical Alumina in the Fertilizer Industry
Catalytic effect: Spherical alumina has excellent catalytic performance and can play a key role as a catalyst or catalyst carrier in the fertilizer production process. Its catalytic effect can promote chemical reactions in fertilizer production, improve production efficiency, reduce energy consumption, and help reduce the generation of by-products.
Fluoride removal performance: During the production process of fertilizers, harmful substances such as fluoride may be produced. If these substances are discharged into the atmosphere and water sources, they can adversely affect the environment. Due to its high porosity and good adsorption performance, spherical alumina can effectively remove these harmful substances, especially fluoride, thereby helping to reduce the environmental pollution caused by fertilizer production.
Stability and mechanical strength: Spherical alumina has good chemical and thermal stability and excellent mechanical strength. This enables it to maintain stable performance during fertilizer production without being easily broken or deformed, thereby ensuring the continuity and stability of the production process.
Improving production efficiency: Applying spherical alumina can also improve material dispersion and flux in fertilizer production, reduce system resistance, and improve production efficiency.
Spherical Alumina has gained significant attention in the fertilizer industry due to its unique properties and potential applications. Its high surface area, porosity, and chemical stability make it an excellent candidate for various fertilizer production and quality improvement tasks.
One of the key areas where spherical alumina powder finds application is in the adsorption of harmful substances. Fertilizer production often generates waste streams containing contaminants such as fluorides, heavy metals, and other pollutants. With its high adsorption capacity, spherical alumina powder can effectively trap and remove these harmful substances from the waste streams, thereby reducing environmental pollution and ensuring the safety of fertilizer products.
Spherical alumina can also be used as a fertilizer additive or catalyst carrier. Its spherical shape and high porosity provide an ideal surface for the uniform distribution and attachment of active components, enhancing their efficiency and stability. This can lead to improved fertilizer performance, such as increased nutrient availability, soil fertility, and crop yields.
Spherical alumina high thermal stability and mechanical strength make it suitable for use in high-temperature fertilizer production processes. It can withstand extreme temperatures without degradation or deformation, ensuring the continuous and stable operation of fertilizer production lines.
Insulating substrates
Al2O3 is frequently employed as a substrate material for integrated circuit (IC) packaging and power electronic modules. Its high dielectric strength and electrical insulating properties make it an excellent choice to provide electrical isolation and support for electronic components, preventing short circuits and ensuring signal integrity.
Thermal management
In electronic devices, efficient heat dissipation is paramount to prevent overheating and ensure optimal performance. Aluminum oxide’s high thermal conductivity enables it to serve as a thermally conductive substrate for power electronics, helping to dissipate heat generated by components such as transistors and diodes. This property is particularly vital in devices like LED packages and high-power amplifiers.
Ceramic capacitors
The compound is common in the production of ceramic capacitors, thanks to its high dielectric constant and stability over a wide range of temperatures. They are widely employed in electronic circuits for coupling, decoupling, filtering, and timing applications.
High-frequency components
In microwave and radio-frequency applications, Al2O3 is used as a substrate material for various components, including antennas, resonators, and filters. Its dielectric properties allow for the precise control of signal propagation and filtering in high-frequency circuits.
Thick film technology
Aluminum oxide-based thick-film pastes are utilized for the deposition of resistors, conductors, and dielectric layers on ceramic substrates. These pastes are integral to the fabrication of hybrid integrated circuits, sensor devices, and multilayer ceramic capacitors.
Sensor technologies
The compound's chemical stability, electrical insulation, and thermal conductivity make it an excellent choice for sensor applications. It’s often used as a substrate for gas sensors, temperature sensors, and pressure sensors, facilitating accurate and reliable measurements.
Electronic packaging
Al2O3 is employed in electronic packaging as a hermetic and insulating material. It helps seal electronic components and modules to protect them from environmental factors such as moisture, dust, and chemicals. This is particularly important in aerospace, automotive, and military electronics.
Alumina ceramics for RF applications
Alumina is widely used in the fabrication of substrates and packages for radio-frequency (RF) and microwave circuits. It provides excellent electrical properties, mechanical strength, and thermal performance for RF applications.
Piezoelectric ceramics
The compound, often doped with various additives, is utilized in the production of piezoelectric ceramics which are crucial for the generation and detection of acoustic waves and vibrations in electronic devices such as ultrasonic sensors, piezoelectric transducers, and inkjet printers.
How to Store Thermal Alumina
High-purity alumina is a wear-resistant material with high purity, high wear resistance and high temperature resistance. It is widely used in semiconductor, chemical industry, electronics, machinery and other fields. During storage, the following matters should be noted.
keep it clean
High purity alumina should be kept clean during storage. If the water content of wear-resistant is too high, it will affect its performance, making it brittle and prone to foaming. Therefore, it is recommended to store high-purity alumina in a dry, dust-free, light-shielded area to avoid direct sunlight and moisture.
Avoid mixing with other materials
Avoid mixing high-purity alumina with other materials. Wear-resistant are hard, brittle and brittle. Once friction or impact occurs with other materials, cracks and damage can easily occur. Therefore, in areas where high-purity alumina are stored, mixing with other materials should be avoided and protected with other materials to prevent unnecessary damage.
keep it smooth
During the storage process, the surface gloss of high-purity alumina must be guaranteed. The surface quality of structural has a great influence on its performance, such as surface unevenness, scratches, etc., which will affect the compressive strength and sealing performance. Therefore, during storage, keep the surface smooth and avoid contact with other hard objects to prevent scratches and other defects.
Main correct packaging materials
Pay attention to the correct packaging of high-purity alumina. Structural are susceptible to external damage during transportation and storage, so the selection of packaging materials is crucial. For high-purity alumina porcelain, use high-quality foam packaging to prevent impact and friction during storage and transportation, and play a buffering and buffering role.
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Spherical Alumina, Aluminium Nitride, aluminium nitride powder