SINASILICA
nanospherical alumina
nanospherical alumina
The spherical alumina produced by high temperature melting and spraying method has the characteristics of high spherical rate and high content of α phase alumina. It shows superior properties when used as filler for rubber and plastic and as raw material for ceramics.
2、Our product specifications:
Spherical alumina · Partial specifications | |||||||||||||
mesh number （ eye ） | 100 | 200 | 325 | 600 | 1250 | 3000 | 5000 | 8000 | 9000 | 10000 | 11000 | 12000 | 13000 |
fineness （μm） | 100 | 80 | 50 | 20 | 10 | 5 | 3 | 2 | 1.5 | 1 | 0.9-1 | 0.8 | 0.7 |
3、Key characteristics of nano-spherical alumina:
l High purity
The product is made by chemical treatment of raw material, which is removed the oxide of silicon, iron, titanium and so on, and the purity of powder is up to 99.7%.
l excellent thermal conductivity
The spherical shape of the product can realize the multi-directional heat transfer, the dispersion in the system is good, and the thermal conductivity of the product is high.
It can be filled with high density, and the mixture with high thermal conductivity and good heat dissipation can be obtained compared with crystalline silicon powder.
l High filling rate
The particle has high spherical ratio and wide particle size distribution, which can be used to fill silica gel, epoxy, rubber and plastic with high density, and obtain mixture with low viscosity and good fluidity.
l low wear resistance
Because of its spherical appearance, it can greatly reduce the wear of mixing machine, molding machine and mold, and prolong the service life of equipment.
l narrow particle size distribution
The particle size distribution of a single particle is relatively concentrated, and the interval frequency distribution curve in the particle size analysis report is a narrow single peak.
IV. Conventional Physical Properties and Main Components of Spherical Alumina
project | unit | Typical value |
nodularity | % | 95 |
Moh's hardness | - | 8 |
density | g/cm³ | 3.85×10³ |
whiteness | - | 95 |
melting point | ℃ | 2054 |
boiling point | ℃ | 2980 |
Main chemical components of spherical alumina | ||
project | unit | Typical value |
Al2O3 | % | ≥99.8 |
Fe2O3 | Ppm | ≤160 |
SiO2 | ppm | ≤150 |
Na2O | ppm | ≤50 |
K2O | ppm | ≤40 |
solid body | angular | Approximately 1900°C |
Start melting | angular | Approximately 2100°C |
liquid state | quasi-spherical | Approximately 2300°C |
liquid state | sphere | ＞2300℃ |
5. Main application areas of spherical alumina:
l thermal interface material
Thermal conductive silicone gaskets, thermal conductive grease, thermal conductive potting compounds, thermal conductive double-sided tapes, phase change materials, heat sinks, fillers for heat dissipation substrates (MC substrates), fillers for silicone thermal conductive adhesives and mixtures, etc. Thermal conductive silicone gaskets, thermal conductive grease, thermal conductive potting compounds, thermal conductive double-sided tapes, phase change materials, heat sinks, fillers for heat dissipation substrates (MC substrates), fillers for silicone thermal conductive adhesives and mixtures, etc.
l thermal conductive engineering plastics
LED lampshades, switch casings, electronic product enclosures, and heat dissipation components for electrical appliances (including heat sinks, thermal paste for heat dissipation substrates, and MC substrates). LED lampshades, switch casings, electronic product enclosures, and heat dissipation components for electrical appliances (including heat sinks, thermal paste for heat dissipation substrates, and MC substrates).
l Al Based Copper Clad Laminate and Semiconductor Packaging
High-power LED circuit substrates, power circuit boards, and fillers for semiconductor encapsulation resins
l Other fields
Alumina ceramic filter, raw materials for artificial corundum and artificial sapphire, etc.
thermal spray coatings, etc.
6. Why Choose Spherical Aluminum Oxide:
Alumina, with the chemical formula Al2O3, is a white powdery compound of high hardness, having a melting point of 2054°C and a boiling point of 2980°C. It is an ionically crystalline material that can ionize at high temperatures and is commonly used in refractory materials. It possesses characteristics such as porosity, high dispersibility, insulating properties, crystal phase stability, high hardness, and excellent dimensional stability.
Spherical alumina is a powdered alumina material produced through high-temperature melting and jet calcination of irregular high-purity alumina, followed by sieving and purification processes. This product exhibits exceptional properties including high thermal conductivity, excellent insulation, high hardness, heat resistance, corrosion resistance, and wear resistance. It also demonstrates outstanding characteristics such as good fluidity, low oil absorption, high spheroidization rate, high α-phase content, small specific surface area, and controllable particle size distribution. It is widely used as a filler in thermal interface materials, thermal engineering plastics, and aluminum-based copper-clad laminates.
Spherical alumina, especially ultrafine spherical alumina powder, has regular morphology, high bulk density, good fluidity, high hardness and strength, and can be used to prepare substrates with excellent properties.
7. Application Industry Analysis of Spherical Aluminum Oxide:
Ø ceramic material
Spherical powders, with their regular morphology, higher bulk density, and excellent flowability, can significantly enhance the mechanical properties of ceramics. Consequently, incorporating a specific amount of spherical alumina powder during ceramic production substantially improves ceramic performance. The low-temperature brittleness of ceramics severely limits their application scope, whereas ceramics containing spherical alumina powder can be used to produce low-temperature resistant plastic ceramics. Furthermore, spherical alumina markedly improves ceramic toughness. When the powder content reaches 5.0%, it effectively enhances ceramic toughness while reducing sintering temperature.
Ø Important materials in the fields of catalysts and their supports
Alumina exhibits high chemical activity due to its abundant unsaturated chemical bonds and numerous catalytic active sites on its surface. Moreover, spherical alumina offers advantages such as minimal particle wear, long service life, and large specific surface area. Consequently, the performance of catalysts and catalyst supports made from spherical alumina is irreplaceable by other materials.
Ø polishing abrasive
Compared with the traditional granular or flake alumina, the spherical alumina has better dispersibility and fluidity, the powder abrasive can be evenly distributed in the polished product, there is no abnormal accumulation of powder, and the particle surface is smooth, which can avoid the scratch of the workpiece surface, thus improving the polishing surface smoothness.
Ø 3D printing materials
Spherical alumina is the most commonly used material for 3D printing due to its high strength, high sphericity, and heat resistance. Spherical alumina powder exhibits excellent particle fluidity, chemical reaction rate, and compactability, making it suitable for printing slurries with high solid content, good fluidity, easy cleaning, and superior mechanical properties.
